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Posted to notifications@freemarker.apache.org by sg...@apache.org on 2020/02/29 15:57:25 UTC

[freemarker-generator] branch master updated: FREEMARKER-135 Support user-supplied names for datasources (#7)

This is an automated email from the ASF dual-hosted git repository.

sgoeschl pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/freemarker-generator.git


The following commit(s) were added to refs/heads/master by this push:
     new 3202c60  FREEMARKER-135 Support user-supplied names for datasources (#7)
3202c60 is described below

commit 3202c602a41b6e3a3c559eca6cc07f420ed5a4d7
Author: Siegfried Goeschl <si...@gmail.com>
AuthorDate: Sat Feb 29 16:57:18 2020 +0100

    FREEMARKER-135 Support user-supplied names for datasources (#7)
    
    * FREEMARKER-135 Support user-supplied names for datasources
    
    * FREEMARKER-135 Support user-supplied names for datasources
---
 CHANGELOG.md                                       |  10 +-
 .../generator/base/FreeMarkerConstants.java        |   8 +
 .../activation/MimetypesFileTypeMapFactory.java    |  42 +++++
 .../generator/base/datasource/Datasource.java      |  16 +-
 .../base/datasource/DatasourceFactory.java         |  39 +++--
 .../generator/base/datasource/Datasources.java     |  36 +++-
 .../base/datasource/DatasourcesSupplier.java       |  56 ++++--
 .../freemarker/generator/base/uri/NamedUri.java    |  93 ++++++++++
 .../NamedUriFragmentParser.java}                   |  28 ++-
 .../generator/base/uri/NamedUriParser.java         |  74 ++++++++
 .../generator/base/util/CachingSupplier.java       |  16 ++
 .../generator/base/util/LocaleUtils.java           |   1 +
 .../generator/base/util/StringUtils.java           |  13 ++
 .../freemarker/generator/base/util/Validate.java   | 150 ++++++++++++++++
 .../datasource/DatasourceFactoryTest.java          |   8 +-
 .../generator/datasource/DatasourceTest.java       |  14 +-
 .../generator/datasource/DatasourcesTest.java      |  27 ++-
 .../generator/uri/NamedUriParserTest.java          | 192 +++++++++++++++++++++
 .../org/apache/freemarker/generator/cli/Main.java  |  75 +++++---
 .../freemarker/generator/cli/config/Settings.java  |  26 +--
 .../freemarker/generator/cli/config/Suppliers.java |   2 +-
 .../generator/cli/task/FreeMarkerTask.java         |   3 +-
 .../freemarker/generator/cli/ExamplesTest.java     |   4 +-
 .../freemarker/generator/cli/ManualTest.java       |   3 +-
 .../freemarker/generator/cli/PicocliTest.java      |  74 ++++++++
 .../generator/cli/config/SettingsTest.java         |   4 +-
 freemarker-generator-cli/templates/info.ftl        |  19 +-
 .../generator/maven/JsonPropertiesProvider.java    |   1 +
 .../tools/properties/PropertiesToolTest.java       |   3 +-
 .../tools/snakeyaml/SnakeYamlToolTest.java         |   4 +-
 .../generator/tools/xml/XmlToolTest.java           |   4 +-
 31 files changed, 941 insertions(+), 104 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index f9a227d..c76d3ff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,12 +5,14 @@ All notable changes to this project will be documented in this file. We try to a
 ## 0.1.0-SNAPSHOT
 
 ### Added
-* [FREEMARKER-129] Support document exclude pattern in addition to include pattern
+* [FREEMARKER-135] Support user-supplied names for `Datasource` on the command line
+* [FREEMARKER-129] Support `Datasource` exclude pattern in addition to include pattern
 * [FREEMARKER-129] User-defined parameters are passed as `-Pkey=value` instead of using system properties
-* [FREEMARKER-129] Add `freemarker-generator-maven-plugin-sample`
+* [FREEMARKER-129] Add `freemarker-generator-maven-plugin-sample` for better testing
 * [FREEMARKER-129] Migrate `freemarker-cli` into `freemarker-generator` project (see [https://github.com/sgoeschl/freemarker-cli](https://github.com/sgoeschl/freemarker-cli))
 
 ### Changed
+* [FREEMARKER-134] Rename `Document` to `Datasource` which also changes `--document` to `--datasource`
 * [FREEMARKER-129] Use `freemarker.configuration.setting` in `freemarker-cli.properties` to configure FreeMarker
 * [FREEMARKER-129] Provide a `toString()` metheod for all tools
 * [FREEMARKER-129] Use version "0.X.Y" to cater for API changes according to [Semantic Versioning](https://semver.org)
@@ -24,4 +26,6 @@ All notable changes to this project will be documented in this file. We try to a
 
 [FREEMARKER-127]: https://issues.apache.org/jira/browse/FREEMARKER-127
 [FREEMARKER-128]: https://issues.apache.org/jira/browse/FREEMARKER-128
-[FREEMARKER-129]: https://issues.apache.org/jira/browse/FREEMARKER-129
\ No newline at end of file
+[FREEMARKER-129]: https://issues.apache.org/jira/browse/FREEMARKER-129
+[FREEMARKER-134]: https://issues.apache.org/jira/browse/FREEMARKER-134
+[FREEMARKER-135]: https://issues.apache.org/jira/browse/FREEMARKER-135
\ No newline at end of file
diff --git a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/FreeMarkerConstants.java b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/FreeMarkerConstants.java
index 94508d1..bc6f47f 100644
--- a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/FreeMarkerConstants.java
+++ b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/FreeMarkerConstants.java
@@ -26,6 +26,14 @@ public class FreeMarkerConstants {
     /* Default encoding for textual content */
     public static final Charset DEFAULT_CHARSET = UTF_8;
 
+    /* Default group name for datasources */
+    public static final String DEFAULT_GROUP = "default";
+
+    public enum GeneratorMode {
+        DATASOURCE,
+        TEMPLATE
+    }
+
     public static class Configuration {
 
         private Configuration() {
diff --git a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/activation/MimetypesFileTypeMapFactory.java b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/activation/MimetypesFileTypeMapFactory.java
new file mode 100644
index 0000000..b75a422
--- /dev/null
+++ b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/activation/MimetypesFileTypeMapFactory.java
@@ -0,0 +1,42 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.freemarker.generator.base.activation;
+
+import javax.activation.MimetypesFileTypeMap;
+
+public class MimetypesFileTypeMapFactory {
+
+    private static MimetypesFileTypeMap mimeTypes;
+
+    public static synchronized MimetypesFileTypeMap create() {
+        if (mimeTypes == null) {
+            mimeTypes = new MimetypesFileTypeMap();
+            mimeTypes.addMimeTypes("application/json json JSON");
+            mimeTypes.addMimeTypes("application/octet-stream bin");
+            mimeTypes.addMimeTypes("application/vnd.ms-excel xls XLS");
+            mimeTypes.addMimeTypes("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet xlsx XLSX");
+            mimeTypes.addMimeTypes("application/xml xml XML");
+            mimeTypes.addMimeTypes("text/csv csv CSV");
+            mimeTypes.addMimeTypes("text/plain txt TXT log LOG ini INI properties md MD");
+            mimeTypes.addMimeTypes("text/yaml yml YML yaml YAML");
+            mimeTypes.addMimeTypes("text/tab-separated-values tsv TSV");
+        }
+
+        return mimeTypes;
+    }
+}
\ No newline at end of file
diff --git a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/datasource/Datasource.java b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/datasource/Datasource.java
index 5de9cae..ed038b0 100644
--- a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/datasource/Datasource.java
+++ b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/datasource/Datasource.java
@@ -36,6 +36,7 @@ import static java.nio.charset.Charset.forName;
 import static java.util.Objects.requireNonNull;
 import static org.apache.commons.io.IOUtils.lineIterator;
 import static org.apache.freemarker.generator.base.FreeMarkerConstants.DATASOURCE_UNKNOWN_LENGTH;
+import static org.apache.freemarker.generator.base.util.StringUtils.emptyToNull;
 
 /**
  * Datasource which encapsulates data to be used for rendering
@@ -47,6 +48,9 @@ public class Datasource implements Closeable {
     /** Human-readable name of the datasource */
     private final String name;
 
+    /** Optional group of datasource */
+    private final String group;
+
     /** Charset for directly accessing text-based content */
     private final Charset charset;
 
@@ -59,8 +63,9 @@ public class Datasource implements Closeable {
     /** Collect all closables handed out to the caller to be closed when the datasource is closed itself */
     private final CloseableReaper closables;
 
-    public Datasource(String name, DataSource dataSource, String location, Charset charset) {
+    public Datasource(String name, String group, DataSource dataSource, String location, Charset charset) {
         this.name = requireNonNull(name);
+        this.group = emptyToNull(group);
         this.dataSource = requireNonNull(dataSource);
         this.location = requireNonNull(location);
         this.charset = requireNonNull(charset);
@@ -71,6 +76,10 @@ public class Datasource implements Closeable {
         return name;
     }
 
+    public String getGroup() {
+        return group;
+    }
+
     public String getBaseName() {
         return FilenameUtils.getBaseName(name);
     }
@@ -83,6 +92,10 @@ public class Datasource implements Closeable {
         return charset;
     }
 
+    public String getContentType() {
+        return dataSource.getContentType();
+    }
+
     public String getLocation() {
         return location;
     }
@@ -213,6 +226,7 @@ public class Datasource implements Closeable {
     public String toString() {
         return "Datasource{" +
                 "name='" + name + '\'' +
+                "group='" + group + '\'' +
                 ", location=" + location +
                 ", charset='" + charset + '\'' +
                 '}';
diff --git a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/datasource/DatasourceFactory.java b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/datasource/DatasourceFactory.java
index c54aa4e..8cf721e 100644
--- a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/datasource/DatasourceFactory.java
+++ b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/datasource/DatasourceFactory.java
@@ -19,6 +19,7 @@ package org.apache.freemarker.generator.base.datasource;
 import org.apache.freemarker.generator.base.FreeMarkerConstants.Location;
 import org.apache.freemarker.generator.base.activation.ByteArrayDataSource;
 import org.apache.freemarker.generator.base.activation.InputStreamDataSource;
+import org.apache.freemarker.generator.base.activation.MimetypesFileTypeMapFactory;
 import org.apache.freemarker.generator.base.activation.StringDataSource;
 
 import javax.activation.DataSource;
@@ -30,6 +31,7 @@ import java.net.URL;
 import java.nio.charset.Charset;
 
 import static java.nio.charset.StandardCharsets.UTF_8;
+import static org.apache.freemarker.generator.base.FreeMarkerConstants.DEFAULT_GROUP;
 
 /**
  * Creates a Datasource from various sources.
@@ -40,37 +42,48 @@ public class DatasourceFactory {
     }
 
     public static Datasource create(URL url) {
-        final String location = url.getProtocol() + "://" + url.getHost();
+        final String location = url.toString();
         final URLDataSource dataSource = new URLDataSource(url);
-        return create(url.getHost(), dataSource, location, UTF_8);
+        return create(url.getHost(), DEFAULT_GROUP, dataSource, location, UTF_8);
     }
 
-    public static Datasource create(String name, String content) {
+    public static Datasource create(String name, String group, URL url, Charset charset) {
+        final String location = url.toString();
+        final URLDataSource dataSource = new URLDataSource(url);
+        return create(name, group, dataSource, location, charset);
+    }
+
+    public static Datasource create(String name, String group, String content) {
         final StringDataSource dataSource = new StringDataSource(name, content, UTF_8);
-        return create(name, dataSource, Location.STRING, UTF_8);
+        return create(name, group, dataSource, Location.STRING, UTF_8);
     }
 
     public static Datasource create(File file, Charset charset) {
+        return create(file.getName(), DEFAULT_GROUP, file, charset);
+    }
+
+    public static Datasource create(String name, String group, File file, Charset charset) {
         final FileDataSource dataSource = new FileDataSource(file);
-        return create(file.getName(), dataSource, file.getAbsolutePath(), charset);
+        dataSource.setFileTypeMap(MimetypesFileTypeMapFactory.create());
+        return create(name, group, dataSource, file.getAbsolutePath(), charset);
     }
 
-    public static Datasource create(String name, byte[] content) {
+    public static Datasource create(String name, String group, byte[] content) {
         final ByteArrayDataSource dataSource = new ByteArrayDataSource(name, content);
-        return create(name, dataSource, Location.BYTES, UTF_8);
+        return create(name, group, dataSource, Location.BYTES, UTF_8);
     }
 
-    public static Datasource create(String name, InputStream is, Charset charset) {
+    public static Datasource create(String name, String group, InputStream is, Charset charset) {
         final InputStreamDataSource dataSource = new InputStreamDataSource(name, is);
-        return create(name, dataSource, Location.INPUTSTREAM, charset);
+        return create(name, group, dataSource, Location.INPUTSTREAM, charset);
     }
 
-    public static Datasource create(String name, InputStream is, String location, Charset charset) {
+    public static Datasource create(String name, String group, InputStream is, String location, Charset charset) {
         final InputStreamDataSource dataSource = new InputStreamDataSource(name, is);
-        return create(name, dataSource, location, charset);
+        return create(name, group, dataSource, location, charset);
     }
 
-    public static Datasource create(String name, DataSource dataSource, String location, Charset charset) {
-        return new Datasource(name, dataSource, location, charset);
+    public static Datasource create(String name, String group, DataSource dataSource, String location, Charset charset) {
+        return new Datasource(name, group, dataSource, location, charset);
     }
 }
diff --git a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/datasource/Datasources.java b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/datasource/Datasources.java
index 51d2804..5c55c6b 100644
--- a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/datasource/Datasources.java
+++ b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/datasource/Datasources.java
@@ -17,6 +17,7 @@
 package org.apache.freemarker.generator.base.datasource;
 
 import org.apache.freemarker.generator.base.util.ClosableUtils;
+import org.apache.freemarker.generator.base.util.StringUtils;
 
 import java.io.Closeable;
 import java.util.ArrayList;
@@ -46,6 +47,21 @@ public class Datasources implements Closeable {
     public List<String> getNames() {
         return datasources.stream()
                 .map(Datasource::getName)
+                .filter(StringUtils::isNotEmpty)
+                .collect(toList());
+    }
+
+    /**
+     * Get the groups of all datasources.
+     *
+     * @return datasource names
+     */
+    public List<String> getGroups() {
+        return datasources.stream()
+                .map(Datasource::getGroup)
+                .filter(StringUtils::isNotEmpty)
+                .sorted()
+                .distinct()
                 .collect(toList());
     }
 
@@ -69,14 +85,6 @@ public class Datasources implements Closeable {
         return datasources.get(index);
     }
 
-    public boolean add(Datasource datasource) {
-        return datasources.add(datasource);
-    }
-
-    public Datasource remove(int index) {
-        return datasources.remove(index);
-    }
-
     /**
      * Get exactly one datasource. If not exactly one datasource
      * is found an exception is thrown.
@@ -110,6 +118,18 @@ public class Datasources implements Closeable {
                 .collect(toList());
     }
 
+    /**
+     * Find datasources based on their group and and globbing pattern.
+     *
+     * @param wildcard globbing pattern
+     * @return list of mathching datasources
+     */
+    public List<Datasource> findByGroup(String wildcard) {
+        return datasources.stream()
+                .filter(d -> wildcardMatch(d.getGroup(), wildcard))
+                .collect(toList());
+    }
+
     @Override
     public void close() {
         datasources.forEach(ClosableUtils::closeQuietly);
diff --git a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/datasource/DatasourcesSupplier.java b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/datasource/DatasourcesSupplier.java
index 3e5a686..8309939 100644
--- a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/datasource/DatasourcesSupplier.java
+++ b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/datasource/DatasourcesSupplier.java
@@ -17,8 +17,11 @@
 package org.apache.freemarker.generator.base.datasource;
 
 import org.apache.freemarker.generator.base.file.RecursiveFileSupplier;
+import org.apache.freemarker.generator.base.uri.NamedUri;
+import org.apache.freemarker.generator.base.uri.NamedUriParser;
 
 import java.net.MalformedURLException;
+import java.net.URI;
 import java.net.URL;
 import java.nio.charset.Charset;
 import java.util.ArrayList;
@@ -26,9 +29,11 @@ import java.util.Collection;
 import java.util.List;
 import java.util.function.Supplier;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static java.util.Collections.singletonList;
 import static java.util.Objects.requireNonNull;
 import static java.util.stream.Collectors.toList;
+import static org.apache.freemarker.generator.base.FreeMarkerConstants.DEFAULT_GROUP;
 
 /**
  * Create a list of <code>Datasource</code> based on a list of sources consisting of
@@ -71,20 +76,34 @@ public class DatasourcesSupplier implements Supplier<List<Datasource>> {
     }
 
     private List<Datasource> get(String source) {
-        if (isHttpUrl(source)) {
-            return singletonList(resolveHttpUrl(source));
-        } else {
-            return resolveFile(source, include, exclude, charset);
+        try {
+            if (isHttpUrl(source)) {
+                return singletonList(resolveHttpUrl(source));
+            } else {
+                return resolveFile(source, include, exclude, charset);
+            }
+        } catch (RuntimeException e) {
+            throw new RuntimeException("Unable to create the datasource: " + source, e);
         }
     }
 
-    private static Datasource resolveHttpUrl(String url) {
-        return DatasourceFactory.create(toUrl(url));
+    private static Datasource resolveHttpUrl(String source) {
+        final NamedUri namedUri = NamedUriParser.parse(source);
+        final URI uri = namedUri.getUri();
+        final String name = getNameOrElse(namedUri, uri.toString());
+        final String group = getGroupOrElse(namedUri, DEFAULT_GROUP);
+        final Charset currCharset = getCharsetOrElse(namedUri, UTF_8);
+        return DatasourceFactory.create(name, group, toUrl(uri), currCharset);
     }
 
     private static List<Datasource> resolveFile(String source, String include, String exclude, Charset charset) {
-        return fileResolver(source, include, exclude).get().stream()
-                .map(file -> DatasourceFactory.create(file, charset))
+        final NamedUri namedUri = NamedUriParser.parse(source);
+        final String path = namedUri.getUri().getPath();
+        final String name = getNameOrElse(namedUri, path);
+        final String group = getGroupOrElse(namedUri, DEFAULT_GROUP);
+        final Charset currCharset = getCharsetOrElse(namedUri, charset);
+        return fileResolver(path, include, exclude).get().stream()
+                .map(file -> DatasourceFactory.create(name, group, file, currCharset))
                 .collect(toList());
     }
 
@@ -93,14 +112,27 @@ public class DatasourcesSupplier implements Supplier<List<Datasource>> {
     }
 
     private static boolean isHttpUrl(String value) {
-        return value.startsWith("http://") || value.startsWith("https://");
+        return value.contains("http://") || value.contains("https://");
     }
 
-    private static URL toUrl(String value) {
+    private static URL toUrl(URI uri) {
         try {
-            return new URL(value);
+            return uri.toURL();
         } catch (MalformedURLException e) {
-            throw new IllegalArgumentException(value, e);
+            throw new IllegalArgumentException(uri.toString(), e);
         }
     }
+
+    private static Charset getCharsetOrElse(NamedUri namedUri, Charset def) {
+        return Charset.forName(namedUri.getParameters().getOrDefault("charset", def.name()));
+    }
+
+    private static String getNameOrElse(NamedUri namedUri, String def) {
+        return namedUri.hasName() ? namedUri.getName() : def;
+    }
+
+    private static String getGroupOrElse(NamedUri namedUri, String def) {
+        return namedUri.hasGroup() ? namedUri.getGroup() : def;
+    }
+
 }
diff --git a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/uri/NamedUri.java b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/uri/NamedUri.java
new file mode 100644
index 0000000..0b1211d
--- /dev/null
+++ b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/uri/NamedUri.java
@@ -0,0 +1,93 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.freemarker.generator.base.uri;
+
+import java.net.URI;
+import java.util.Map;
+
+import static java.util.Objects.requireNonNull;
+import static org.apache.freemarker.generator.base.util.StringUtils.isEmpty;
+
+/**
+ * Caputeres the information of a user-supplied "named URI".
+ */
+public class NamedUri {
+
+    /** User-supplied name */
+    private final String name;
+
+    /** User-supplied group */
+    private final String group;
+
+    /** The URI */
+    private final URI uri;
+
+    /** Name/value pairs parsed from URI fragment */
+    private final Map<String, String> parameters;
+
+    public NamedUri(URI uri, Map<String, String> parameters) {
+        this.name = null;
+        this.group = null;
+        this.uri = requireNonNull(uri);
+        this.parameters = requireNonNull(parameters);
+    }
+
+    public NamedUri(String name, String group, URI uri, Map<String, String> parameters) {
+        this.name = emptyToNull(name);
+        this.group = emptyToNull(group);
+        this.uri = requireNonNull(uri);
+        this.parameters = requireNonNull(parameters);
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getGroup() {
+        return group;
+    }
+
+    public URI getUri() {
+        return uri;
+    }
+
+    public Map<String, String> getParameters() {
+        return parameters;
+    }
+
+    public boolean hasName() {
+        return !isEmpty(this.name);
+    }
+
+    public boolean hasGroup() {
+        return !isEmpty(this.group);
+    }
+
+    @Override
+    public String toString() {
+        return "NamedUri{" +
+                "name='" + name + '\'' +
+                ", group='" + group + '\'' +
+                ", uri=" + uri +
+                ", parameters=" + parameters +
+                '}';
+    }
+
+    private static String emptyToNull(String value) {
+        return value != null && value.trim().isEmpty() ? null : value;
+    }
+}
diff --git a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/LocaleUtils.java b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/uri/NamedUriFragmentParser.java
similarity index 52%
copy from freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/LocaleUtils.java
copy to freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/uri/NamedUriFragmentParser.java
index 5edd405..304a233 100644
--- a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/LocaleUtils.java
+++ b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/uri/NamedUriFragmentParser.java
@@ -14,20 +14,32 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.freemarker.generator.base.util;
+package org.apache.freemarker.generator.base.uri;
 
-import java.util.Locale;
+import java.util.Arrays;
+import java.util.Map;
 
+import static java.util.Collections.emptyMap;
+import static java.util.stream.Collectors.toMap;
 import static org.apache.freemarker.generator.base.util.StringUtils.isEmpty;
 
-public class LocaleUtils {
+/**
+ * Parses the URI fragment as list of name/value pairs seperated by an ampersand.
+ */
+public class NamedUriFragmentParser {
 
-    public static Locale parseLocale(String value) {
-        if (isEmpty(value) || value.equalsIgnoreCase("JVM default") || value.equalsIgnoreCase("default")) {
-            return Locale.getDefault();
+    public static Map<String, String> parse(String fragment) {
+        if (isEmpty(fragment)) {
+            return emptyMap();
         }
 
-        final String[] parts = value.split("_");
-        return parts.length == 1 ? new Locale(parts[0]) : new Locale(parts[0], parts[1]);
+        try {
+            final String[] nameValuePairs = fragment.split("&");
+            return Arrays.stream(nameValuePairs)
+                    .map(s -> s.split("="))
+                    .collect(toMap(parts -> parts[0], parts -> parts[1]));
+        } catch (RuntimeException e) {
+            throw new RuntimeException("Unable to parse URI fragment: " + fragment, e);
+        }
     }
 }
diff --git a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/uri/NamedUriParser.java b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/uri/NamedUriParser.java
new file mode 100644
index 0000000..a5ab42b
--- /dev/null
+++ b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/uri/NamedUriParser.java
@@ -0,0 +1,74 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.freemarker.generator.base.uri;
+
+import org.apache.freemarker.generator.base.util.Validate;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import static java.util.regex.Pattern.compile;
+
+/**
+ * Parses a named URI provided by the caller.
+ * <ul>
+ *     <li>users.csv</li>
+ *     <li>file:///users.csv</li>
+ *     <li>users=file:///users.csv</li>
+ *     <li>users:admin=file:///users.csv</li>
+ *     <li>users=file:///users.csv#charset=UTF-16&mimetype=text/csv</li>
+ * </ul>
+ */
+public class NamedUriParser {
+
+    private static final String NAME = "name";
+    private static final String GROUP = "group";
+    private static final String URI = "uri";
+
+    private static final Pattern NAMED_URI_REGEXP = compile("^(?<name>[a-zA-Z0-9-_]*):?(?<group>[a-zA-Z0-9-_]*)=(?<uri>.*)");
+
+    public static NamedUri parse(String value) {
+        Validate.notEmpty(value, "Named URI is empty");
+
+        final Matcher matcher = NAMED_URI_REGEXP.matcher(value);
+
+        if (matcher.matches()) {
+            final String name = matcher.group(NAME);
+            final String group = matcher.group(GROUP);
+            final URI uri = uri(matcher.group(URI));
+            return new NamedUri(name, group, uri, parameters(uri));
+        } else {
+            final URI uri = uri(value);
+            return new NamedUri(uri, parameters(uri));
+        }
+    }
+
+    private static URI uri(String value) {
+        try {
+            return new URI(value);
+        } catch (URISyntaxException e) {
+            throw new RuntimeException("Failed to parse URI: " + value, e);
+        }
+    }
+
+    private static Map<String, String> parameters(URI uri) {
+        return NamedUriFragmentParser.parse(uri.getFragment());
+    }
+}
diff --git a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/CachingSupplier.java b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/CachingSupplier.java
index fbada67..dab4334 100644
--- a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/CachingSupplier.java
+++ b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/CachingSupplier.java
@@ -1,3 +1,19 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package org.apache.freemarker.generator.base.util;
 
 import java.util.function.Supplier;
diff --git a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/LocaleUtils.java b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/LocaleUtils.java
index 5edd405..95f6a7f 100644
--- a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/LocaleUtils.java
+++ b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/LocaleUtils.java
@@ -23,6 +23,7 @@ import static org.apache.freemarker.generator.base.util.StringUtils.isEmpty;
 public class LocaleUtils {
 
     public static Locale parseLocale(String value) {
+        // "JVM default" is a special value defined by FreeMarker
         if (isEmpty(value) || value.equalsIgnoreCase("JVM default") || value.equalsIgnoreCase("default")) {
             return Locale.getDefault();
         }
diff --git a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/StringUtils.java b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/StringUtils.java
index 769fd06..4dd8184 100644
--- a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/StringUtils.java
+++ b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/StringUtils.java
@@ -21,4 +21,17 @@ public class StringUtils {
     public static boolean isEmpty(String value) {
         return value == null || value.trim().isEmpty();
     }
+
+    public static boolean isNotEmpty(String value) {
+        return !isEmpty(value);
+    }
+
+    public static String emptyToNull(String value) {
+        return value != null && value.trim().isEmpty() ? null : value;
+    }
+
+    public static String nullToEmpty(String value) {
+        return value == null ? "" : value;
+    }
+
 }
diff --git a/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/Validate.java b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/Validate.java
new file mode 100644
index 0000000..71bd28a
--- /dev/null
+++ b/freemarker-generator-base/src/main/java/org/apache/freemarker/generator/base/util/Validate.java
@@ -0,0 +1,150 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.freemarker.generator.base.util;
+
+/**
+ * Simple validation methods designed for interal use.
+ */
+public final class Validate {
+
+    private Validate() {
+    }
+
+    /**
+     * Validates that the object is not null
+     *
+     * @param obj object to test
+     */
+    public static void notNull(Object obj) {
+        if (obj == null) {
+            throw new IllegalArgumentException("Object must not be null");
+        }
+    }
+
+    /**
+     * Validates that the object is not null
+     *
+     * @param obj object to test
+     * @param msg message to output if validation fails
+     */
+    public static void notNull(Object obj, String msg) {
+        if (obj == null) {
+            throw new IllegalArgumentException(msg);
+        }
+    }
+
+    /**
+     * Validates that the value is true
+     *
+     * @param val object to test
+     */
+    public static void isTrue(boolean val) {
+        if (!val) {
+            throw new IllegalArgumentException("Must be true");
+        }
+    }
+
+    /**
+     * Validates that the value is true
+     *
+     * @param val object to test
+     * @param msg message to output if validation fails
+     */
+    public static void isTrue(boolean val, String msg) {
+        if (!val) {
+            throw new IllegalArgumentException(msg);
+        }
+    }
+
+    /**
+     * Validates that the value is false
+     *
+     * @param val object to test
+     */
+    public static void isFalse(boolean val) {
+        if (val) {
+            throw new IllegalArgumentException("Must be false");
+        }
+    }
+
+    /**
+     * Validates that the value is false
+     *
+     * @param val object to test
+     * @param msg message to output if validation fails
+     */
+    public static void isFalse(boolean val, String msg) {
+        if (val) {
+            throw new IllegalArgumentException(msg);
+        }
+    }
+
+    /**
+     * Validates that the array contains no null elements
+     *
+     * @param objects the array to test
+     */
+    public static void noNullElements(Object[] objects) {
+        noNullElements(objects, "Array must not contain any null objects");
+    }
+
+    /**
+     * Validates that the array contains no null elements
+     *
+     * @param objects the array to test
+     * @param msg     message to output if validation fails
+     */
+    public static void noNullElements(Object[] objects, String msg) {
+        for (Object obj : objects) {
+            if (obj == null) {
+                throw new IllegalArgumentException(msg);
+            }
+        }
+    }
+
+    /**
+     * Validates that the string is not empty
+     *
+     * @param string the string to test
+     */
+    public static void notEmpty(String string) {
+        if (string == null || string.trim().isEmpty()) {
+            throw new IllegalArgumentException("String must not be empty");
+        }
+    }
+
+    /**
+     * Validates that the string is not empty
+     *
+     * @param string the string to test
+     * @param msg    message to output if validation fails
+     */
+    public static void notEmpty(String string, String msg) {
+        if (string == null || string.trim().isEmpty()) {
+            throw new IllegalArgumentException(msg);
+        }
+    }
+
+    /**
+     * Cause a failure.
+     *
+     * @param msg message to output.
+     */
+    public static void fail(String msg) {
+        throw new IllegalArgumentException(msg);
+    }
+}
diff --git a/freemarker-generator-base/src/test/java/org/apache/freemarker/generator/datasource/DatasourceFactoryTest.java b/freemarker-generator-base/src/test/java/org/apache/freemarker/generator/datasource/DatasourceFactoryTest.java
index 677f991..c3bb493 100644
--- a/freemarker-generator-base/src/test/java/org/apache/freemarker/generator/datasource/DatasourceFactoryTest.java
+++ b/freemarker-generator-base/src/test/java/org/apache/freemarker/generator/datasource/DatasourceFactoryTest.java
@@ -49,9 +49,10 @@ public class DatasourceFactoryTest {
 
     @Test
     public void shouldCreateStringBasedDatasource() throws IOException {
-        final Datasource datasource = DatasourceFactory.create("test.txt", ANY_TEXT);
+        final Datasource datasource = DatasourceFactory.create("test.txt", "default", ANY_TEXT);
 
         assertEquals("test.txt", datasource.getName());
+        assertEquals("default", datasource.getGroup());
         assertEquals(UTF_8, datasource.getCharset());
         assertEquals("string", datasource.getLocation());
         assertEquals(ANY_TEXT, datasource.getText());
@@ -60,9 +61,10 @@ public class DatasourceFactoryTest {
 
     @Test
     public void shouldCreateByteArrayBasedDatasource() throws IOException {
-        final Datasource datasource = DatasourceFactory.create("test.txt", ANY_TEXT.getBytes(UTF_8));
+        final Datasource datasource = DatasourceFactory.create("test.txt", "default", ANY_TEXT.getBytes(UTF_8));
 
         assertEquals("test.txt", datasource.getName());
+        assertEquals("default", datasource.getGroup());
         assertEquals(UTF_8, datasource.getCharset());
         assertEquals("bytes", datasource.getLocation());
         assertEquals(ANY_TEXT, datasource.getText());
@@ -72,7 +74,7 @@ public class DatasourceFactoryTest {
     @Test
     public void shouldCreateInputStreamBasedDatasource() throws IOException {
         final InputStream is = new ByteArrayInputStream(ANY_TEXT.getBytes(UTF_8));
-        final Datasource datasource = DatasourceFactory.create("test.txt", is, UTF_8);
+        final Datasource datasource = DatasourceFactory.create("test.txt", "default", is, UTF_8);
 
         assertEquals("test.txt", datasource.getName());
         assertEquals(UTF_8, datasource.getCharset());
diff --git a/freemarker-generator-base/src/test/java/org/apache/freemarker/generator/datasource/DatasourceTest.java b/freemarker-generator-base/src/test/java/org/apache/freemarker/generator/datasource/DatasourceTest.java
index 878dd2c..a1b73cd 100644
--- a/freemarker-generator-base/src/test/java/org/apache/freemarker/generator/datasource/DatasourceTest.java
+++ b/freemarker-generator-base/src/test/java/org/apache/freemarker/generator/datasource/DatasourceTest.java
@@ -30,12 +30,14 @@ import java.nio.charset.Charset;
 import java.util.Iterator;
 
 import static java.nio.charset.StandardCharsets.UTF_8;
+import static org.apache.freemarker.generator.base.FreeMarkerConstants.DEFAULT_GROUP;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
 public class DatasourceTest {
 
+    private static final String ANY_GROUP = "group";
     private static final String ANY_TEXT = "Hello World";
     private static final String ANY_FILE_NAME = "pom.xml";
     private static final Charset ANY_CHAR_SET = UTF_8;
@@ -43,12 +45,14 @@ public class DatasourceTest {
 
     @Test
     public void shouldSupportTextDatasource() throws IOException {
-        try (Datasource datasource = DatasourceFactory.create("stdin", ANY_TEXT)) {
+        try (Datasource datasource = DatasourceFactory.create("stdin", ANY_GROUP, ANY_TEXT)) {
             assertEquals("stdin", datasource.getName());
+            assertEquals(ANY_GROUP, datasource.getGroup());
             assertEquals("stdin", datasource.getBaseName());
             assertEquals("", datasource.getExtension());
             assertEquals("string", datasource.getLocation());
             assertEquals(UTF_8, datasource.getCharset());
+            assertEquals("plain/text", datasource.getContentType());
             assertTrue(datasource.getLength() > 0);
             assertEquals(ANY_TEXT, datasource.getText());
         }
@@ -58,23 +62,27 @@ public class DatasourceTest {
     public void shouldSupportFileDatasource() throws IOException {
         try (Datasource datasource = DatasourceFactory.create(ANY_FILE, ANY_CHAR_SET)) {
             assertEquals(ANY_FILE_NAME, datasource.getName());
+            assertEquals(DEFAULT_GROUP, datasource.getGroup());
             assertEquals("pom", datasource.getBaseName());
             assertEquals("xml", datasource.getExtension());
             assertEquals(ANY_FILE.getAbsolutePath(), datasource.getLocation());
             assertEquals(Charset.defaultCharset(), datasource.getCharset());
+            assertEquals("application/xml", datasource.getContentType());
             assertTrue(datasource.getLength() > 0);
             assertFalse(datasource.getText().isEmpty());
         }
     }
 
-    @Ignore
+    @Ignore("Requires internet conenection")
     @Test
     public void shouldSupportUrlDatasource() throws IOException {
         try (Datasource datasource = DatasourceFactory.create(new URL("https://google.com?foo=bar"))) {
             assertEquals("google.com", datasource.getName());
+            assertEquals(DEFAULT_GROUP, datasource.getGroup());
             assertEquals("google", datasource.getBaseName());
             assertEquals("com", datasource.getExtension());
             assertEquals("https://google.com", datasource.getLocation());
+            assertEquals("text/html; charset=ISO-8859-1", datasource.getContentType());
             assertEquals(UTF_8, datasource.getCharset());
             assertEquals(-1, datasource.getLength());
             assertFalse(datasource.getText().isEmpty());
@@ -127,7 +135,7 @@ public class DatasourceTest {
     }
 
     private static Datasource textDatasource() {
-        return DatasourceFactory.create("stdin", ANY_TEXT);
+        return DatasourceFactory.create("stdin", "default", ANY_TEXT);
     }
 
     private static final class TestClosable implements Closeable {
diff --git a/freemarker-generator-base/src/test/java/org/apache/freemarker/generator/datasource/DatasourcesTest.java b/freemarker-generator-base/src/test/java/org/apache/freemarker/generator/datasource/DatasourcesTest.java
index b580191..de78af5 100644
--- a/freemarker-generator-base/src/test/java/org/apache/freemarker/generator/datasource/DatasourcesTest.java
+++ b/freemarker-generator-base/src/test/java/org/apache/freemarker/generator/datasource/DatasourcesTest.java
@@ -27,6 +27,8 @@ import java.net.URL;
 
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static java.util.Arrays.asList;
+import static java.util.Collections.singletonList;
+import static org.apache.freemarker.generator.base.FreeMarkerConstants.DEFAULT_GROUP;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
@@ -41,7 +43,7 @@ public class DatasourcesTest {
     private static final String ANY_URL = "https://server.invalid?foo=bar";
 
     @Test
-    public void shouldFindByWildcard() {
+    public void shouldFindByName() {
         final Datasources datasources = datasources();
 
         assertEquals(0, datasources.find(null).size());
@@ -63,6 +65,22 @@ public class DatasourcesTest {
     }
 
     @Test
+    public void shouldFindByGroup() {
+        final Datasources datasources = datasources();
+
+        assertEquals(0, datasources.findByGroup(null).size());
+        assertEquals(0, datasources.findByGroup("").size());
+
+        assertEquals(0, datasources.findByGroup("unknown").size());
+
+        assertEquals(3, datasources.findByGroup("*").size());
+        assertEquals(3, datasources.findByGroup("default").size());
+        assertEquals(3, datasources.findByGroup("d*").size());
+        assertEquals(3, datasources.findByGroup("d??????").size());
+
+    }
+
+    @Test
     public void shouldGetDatasource() {
         assertNotNull(datasources().get(ANY_FILE_NAME));
     }
@@ -85,6 +103,11 @@ public class DatasourcesTest {
         assertEquals(asList("unknown", "pom.xml", "server.invalid"), datasources().getNames());
     }
 
+    @Test
+    public void shouldGetGroups() {
+        assertEquals(singletonList(DEFAULT_GROUP), datasources().getGroups());
+    }
+
     @Test(expected = IllegalArgumentException.class)
     public void shouldThrowExceptionWhenGetDoesNotFindDatasource() {
         datasources().get("file-does-not-exist");
@@ -100,7 +123,7 @@ public class DatasourcesTest {
     }
 
     private static Datasource textDatasource() {
-        return DatasourceFactory.create(UNKNOWN, ANY_TEXT);
+        return DatasourceFactory.create(UNKNOWN, DEFAULT_GROUP, ANY_TEXT);
     }
 
     private static Datasource fileDatasource() {
diff --git a/freemarker-generator-base/src/test/java/org/apache/freemarker/generator/uri/NamedUriParserTest.java b/freemarker-generator-base/src/test/java/org/apache/freemarker/generator/uri/NamedUriParserTest.java
new file mode 100644
index 0000000..06718a0
--- /dev/null
+++ b/freemarker-generator-base/src/test/java/org/apache/freemarker/generator/uri/NamedUriParserTest.java
@@ -0,0 +1,192 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.freemarker.generator.uri;
+
+import org.apache.freemarker.generator.base.uri.NamedUri;
+import org.apache.freemarker.generator.base.uri.NamedUriParser;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+public class NamedUriParserTest {
+
+    @Test
+    public void shouldParseRelativeFileName() {
+        final NamedUri namedURI = parse("users.csv");
+
+        assertNull(namedURI.getName());
+        assertNull(namedURI.getGroup());
+        assertEquals("users.csv", namedURI.getUri().toString());
+        assertEquals(0, namedURI.getParameters().size());
+    }
+
+    @Test
+    public void shouldParseAbsoluteFileName() {
+        final NamedUri namedURI = parse("/data/users.csv");
+
+        assertNull(namedURI.getName());
+        assertNull(namedURI.getGroup());
+        assertEquals("/data/users.csv", namedURI.getUri().toString());
+        assertEquals(0, namedURI.getParameters().size());
+    }
+
+    @Test
+    public void shouldParseDirectoryName() {
+        final NamedUri namedURI = parse("users/");
+
+        assertNull(namedURI.getName());
+        assertNull(namedURI.getGroup());
+        assertEquals("users/", namedURI.getUri().toString());
+        assertEquals(0, namedURI.getParameters().size());
+    }
+
+    @Test
+    public void shouldParseFileUri() {
+        final NamedUri namedURI = parse("file:///users.csv");
+
+        assertNull(namedURI.getName());
+        assertNull(namedURI.getGroup());
+        assertEquals("file:///users.csv", namedURI.getUri().toString());
+        assertEquals(0, namedURI.getParameters().size());
+    }
+
+    @Test
+    public void shouldParseNamedFileUri() {
+        final NamedUri namedURI = parse("users=file:///users.csv");
+
+        assertEquals("users", namedURI.getName());
+        assertNull(namedURI.getGroup());
+        assertEquals("file:///users.csv", namedURI.getUri().toString());
+        assertEquals(0, namedURI.getParameters().size());
+    }
+
+    @Test
+    public void shouldParseNamedGroupFileUri() {
+        final NamedUri namedURI = parse("users:admin=file:///some-admin-users.csv");
+
+        assertEquals("users", namedURI.getName());
+        assertEquals("admin", namedURI.getGroup());
+        assertEquals("file:///some-admin-users.csv", namedURI.getUri().toString());
+        assertEquals(0, namedURI.getParameters().size());
+    }
+
+    @Test
+    public void shouldParseNamedWithEmptyGroupFileUri() {
+        final NamedUri namedURI = parse("users:=file:///some-admin-users.csv");
+
+        assertEquals("users", namedURI.getName());
+        assertNull(namedURI.getGroup());
+        assertEquals("file:///some-admin-users.csv", namedURI.getUri().toString());
+        assertEquals(0, namedURI.getParameters().size());
+    }
+
+    @Test
+    public void shouldParseEmptyNamedWithGroupFileUri() {
+        final NamedUri namedURI = parse(":admin=file:///some-admin-users.csv");
+
+        assertNull(namedURI.getName());
+        assertEquals("admin", namedURI.getGroup());
+        assertEquals("file:///some-admin-users.csv", namedURI.getUri().toString());
+        assertEquals(0, namedURI.getParameters().size());
+    }
+
+    @Test
+    public void shouldParseNamedFileUriWithFragment() {
+        final NamedUri namedURI = parse("users=file:///users.csv#charset=UTF-16&mimetype=text/csv");
+
+        assertEquals("users", namedURI.getName());
+        assertNull(namedURI.getGroup());
+        assertEquals("file:///users.csv#charset=UTF-16&mimetype=text/csv", namedURI.getUri().toString());
+        assertEquals(2, namedURI.getParameters().size());
+        assertEquals("UTF-16", namedURI.getParameters().get("charset"));
+        assertEquals("text/csv", namedURI.getParameters().get("mimetype"));
+    }
+
+    @Test
+    public void shouldParseUrl() {
+        final NamedUri namedURI = parse("http://google.com");
+
+        assertNull(namedURI.getName());
+        assertNull(namedURI.getGroup());
+        assertEquals("http://google.com", namedURI.getUri().toString());
+        assertEquals(0, namedURI.getParameters().size());
+    }
+
+    @Test
+    public void shouldParseUrlWithFragment() {
+        final NamedUri namedURI = parse("http://google.com#charset=UTF-16");
+
+        assertNull(namedURI.getName());
+        assertEquals("http://google.com#charset=UTF-16", namedURI.getUri().toString());
+        assertEquals(1, namedURI.getParameters().size());
+        assertEquals("UTF-16", namedURI.getParameters().get("charset"));
+    }
+
+    @Test
+    public void shouldParseNamedUrl() {
+        final NamedUri namedURI = parse("google=http://google.com");
+
+        assertEquals("google", namedURI.getName());
+        assertEquals("http://google.com", namedURI.getUri().toString());
+        assertEquals(0, namedURI.getParameters().size());
+    }
+
+    @Test
+    public void shouldParseNamedUrlWithQuery() {
+        final NamedUri namedURI = parse("google=http://google.com?foo=bar");
+
+        assertEquals("google", namedURI.getName());
+        assertEquals("http://google.com?foo=bar", namedURI.getUri().toString());
+        assertEquals(0, namedURI.getParameters().size());
+    }
+
+    @Test
+    public void shouldParseNamedUrlWithQueryAndFragment() {
+        final NamedUri namedURI = parse("google=http://google.com?foo=bar#charset=UTF-16");
+
+        assertEquals("google", namedURI.getName());
+        assertEquals("http://google.com?foo=bar#charset=UTF-16", namedURI.getUri().toString());
+        assertEquals(1, namedURI.getParameters().size());
+        assertEquals("UTF-16", namedURI.getParameters().get("charset"));
+    }
+
+    @Test
+    public void shouldParseNamedGroupUrlWithQueryAndFragment() {
+        final NamedUri namedURI = parse("google:web=http://google.com?foo=bar#charset=UTF-16");
+
+        assertEquals("google", namedURI.getName());
+        assertEquals("web", namedURI.getGroup());
+        assertEquals("http://google.com?foo=bar#charset=UTF-16", namedURI.getUri().toString());
+        assertEquals(1, namedURI.getParameters().size());
+        assertEquals("UTF-16", namedURI.getParameters().get("charset"));
+    }
+
+    @Test(expected = RuntimeException.class)
+    public void shouldThrowExceptionOnParsingNull() {
+        parse(null);
+    }
+
+    @Test(expected = RuntimeException.class)
+    public void shouldThrowExceptionOnParsingEmptyString() {
+        parse(" ");
+    }
+
+    private static NamedUri parse(String value) {
+        return NamedUriParser.parse(value);
+    }
+}
diff --git a/freemarker-generator-cli/src/main/java/org/apache/freemarker/generator/cli/Main.java b/freemarker-generator-cli/src/main/java/org/apache/freemarker/generator/cli/Main.java
index 82dbc6f..406c70e 100644
--- a/freemarker-generator-cli/src/main/java/org/apache/freemarker/generator/cli/Main.java
+++ b/freemarker-generator-cli/src/main/java/org/apache/freemarker/generator/cli/Main.java
@@ -16,6 +16,7 @@
  */
 package org.apache.freemarker.generator.cli;
 
+import org.apache.freemarker.generator.base.FreeMarkerConstants.GeneratorMode;
 import org.apache.freemarker.generator.base.util.ClosableUtils;
 import org.apache.freemarker.generator.base.util.StringUtils;
 import org.apache.freemarker.generator.cli.config.Settings;
@@ -33,13 +34,16 @@ import java.io.FileWriter;
 import java.io.IOException;
 import java.io.OutputStreamWriter;
 import java.io.Writer;
-import java.util.ArrayList;
+import java.util.Collection;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Properties;
 import java.util.concurrent.Callable;
+import java.util.stream.Collectors;
 import java.util.stream.IntStream;
+import java.util.stream.Stream;
 
 import static java.util.Objects.requireNonNull;
 import static org.apache.freemarker.generator.cli.config.Suppliers.propertiesSupplier;
@@ -51,9 +55,9 @@ public class Main implements Callable<Integer> {
     private static final String FREEMARKER_CLI_PROPERTY_FILE = "freemarker-cli.properties";
 
     @ArgGroup(multiplicity = "1")
-    private TemplateSourceOptions templateSourceOptions;
+    TemplateSourceOptions templateSourceOptions;
 
-    private static final class TemplateSourceOptions {
+    static final class TemplateSourceOptions {
         @Option(names = { "-t", "--template" }, description = "FreeMarker template to render")
         private String template;
 
@@ -62,52 +66,62 @@ public class Main implements Callable<Integer> {
     }
 
     @Option(names = { "-b", "--basedir" }, description = "Optional template base directory")
-    private String baseDir;
+    String baseDir;
+
+    @Option(names = { "-d", "--datasource" }, description = "Datasource used for rendering")
+    List<String> datasources;
 
     @Option(names = { "-D", "--system-property" }, description = "Set system property")
-    private Properties systemProperties;
+    Properties systemProperties;
 
     @Option(names = { "-e", "--input-encoding" }, description = "Encoding of datasource", defaultValue = "UTF-8")
-    private String inputEncoding;
+    String inputEncoding;
 
     @Option(names = { "-E", "--expose-env" }, description = "Expose environment variables and user-supplied properties globally")
-    private boolean isEnvironmentExposed;
+    boolean isEnvironmentExposed;
 
     @Option(names = { "-l", "--locale" }, description = "Locale being used for the output, e.g. 'en_US'")
-    private String locale;
+    String locale;
+
+    @Option(names = { "-m", "--mode" }, description = "[template|datasource]", defaultValue = "TEMPLATE")
+    GeneratorMode mode;
 
     @Option(names = { "-o", "--output" }, description = "Output file")
-    private String outputFile;
+    String outputFile;
 
     @Option(names = { "-P", "--param" }, description = "Set parameter")
-    private Map<String, String> parameters;
+    Map<String, String> parameters;
 
     @Option(names = { "--config" }, defaultValue = FREEMARKER_CLI_PROPERTY_FILE, description = "FreeMarker CLI configuration file")
-    private String configFile;
+    String configFile;
 
     @Option(names = { "--include" }, description = "File pattern for datasource input directory")
-    private String include;
+    String include;
 
     @Option(names = { "--exclude" }, description = "File pattern for datasource input directory")
-    private String exclude;
+    String exclude;
 
     @Option(names = { "--output-encoding" }, description = "Encoding of output, e.g. UTF-8", defaultValue = "UTF-8")
-    private String outputEncoding;
+    String outputEncoding;
 
     @Option(names = { "--stdin" }, description = "Read datasource from stdin")
-    private boolean readFromStdin;
+    boolean readFromStdin;
 
     @Option(names = { "--times" }, defaultValue = "1", description = "Re-run X times for profiling")
-    private int times;
+    int times;
 
     @Parameters(description = "List of input files and/or input directories")
-    private List<String> sources;
+    List<String> sources;
 
     /** User-supplied command line parameters */
-    private final String[] args;
+    final String[] args;
 
     /** User-supplied writer (used mainly for unit testing) */
-    private Writer userSuppliedWriter;
+    Writer userSuppliedWriter;
+
+    Main() {
+        this.args = new String[0];
+    }
 
     private Main(String[] args) {
         this.args = requireNonNull(args);
@@ -178,7 +192,7 @@ public class Main implements Callable<Integer> {
                 .setOutputEncoding(outputEncoding)
                 .setOutputFile(outputFile)
                 .setParameters(parameters != null ? parameters : new HashMap<>())
-                .setSources(sources != null ? sources : new ArrayList<>())
+                .setDatasources(getCombindedDatasources())
                 .setSystemProperties(systemProperties != null ? systemProperties : new Properties())
                 .setTemplateDirectories(templateDirectories)
                 .setTemplateName(templateSourceOptions.template)
@@ -206,6 +220,27 @@ public class Main implements Callable<Integer> {
         }
     }
 
+    /**
+     * Datasources can be passed via command line option and/or
+     * positional parameter so we need to merge them.
+     *
+     * @return List of datasources
+     */
+    private List<String> getCombindedDatasources() {
+        if (isTemplateDrivenGeneration()) {
+            return Stream.of(datasources, sources)
+                    .filter(Objects::nonNull)
+                    .flatMap(Collection::stream)
+                    .collect(Collectors.toList());
+        } else {
+            throw new IllegalArgumentException("Not implemented yet");
+        }
+    }
+
+    private boolean isTemplateDrivenGeneration() {
+        return mode == GeneratorMode.TEMPLATE;
+    }
+
     private static List<File> getTemplateDirectories(String baseDir) {
         return templateDirectorySupplier(baseDir).get();
     }
diff --git a/freemarker-generator-cli/src/main/java/org/apache/freemarker/generator/cli/config/Settings.java b/freemarker-generator-cli/src/main/java/org/apache/freemarker/generator/cli/config/Settings.java
index c1a63b3..5facf82 100644
--- a/freemarker-generator-cli/src/main/java/org/apache/freemarker/generator/cli/config/Settings.java
+++ b/freemarker-generator-cli/src/main/java/org/apache/freemarker/generator/cli/config/Settings.java
@@ -52,7 +52,7 @@ public class Settings {
     /** List of FreeMarker template directories */
     private final List<File> templateDirectories;
 
-    /** Name of the template to be loaded and rendered  */
+    /** Name of the template to be loaded and rendered */
     private final String templateName;
 
     /** Template provided by the user interactivly */
@@ -86,7 +86,7 @@ public class Settings {
     private final boolean isEnvironmentExposed;
 
     /** User-supplied list of source files or directories */
-    private final List<String> sources;
+    private final List<String> datasources;
 
     /** User-supplied parameters */
     private final Map<String, String> parameters;
@@ -112,7 +112,7 @@ public class Settings {
             Locale locale,
             boolean isReadFromStdin,
             boolean isEnvironmentExposed,
-            List<String> sources,
+            List<String> datasources,
             Map<String, String> parameters,
             Properties sytemProperties,
             Writer writer) {
@@ -133,7 +133,7 @@ public class Settings {
         this.locale = requireNonNull(locale);
         this.isReadFromStdin = isReadFromStdin;
         this.isEnvironmentExposed = isEnvironmentExposed;
-        this.sources = requireNonNull(sources);
+        this.datasources = requireNonNull(datasources);
         this.parameters = requireNonNull(parameters);
         this.sytemProperties = requireNonNull(sytemProperties);
         this.configuration = requireNonNull(configuration);
@@ -204,8 +204,8 @@ public class Settings {
         return isEnvironmentExposed;
     }
 
-    public List<String> getSources() {
-        return sources;
+    public List<String> getDatasources() {
+        return datasources;
     }
 
     public Map<String, String> getParameters() {
@@ -262,7 +262,7 @@ public class Settings {
                 ", locale=" + locale +
                 ", isReadFromStdin=" + isReadFromStdin +
                 ", isEnvironmentExposed=" + isEnvironmentExposed +
-                ", sources=" + sources +
+                ", datasources=" + datasources +
                 ", properties=" + parameters +
                 ", sytemProperties=" + sytemProperties +
                 ", writer=" + writer +
@@ -288,7 +288,7 @@ public class Settings {
         private String locale;
         private boolean isReadFromStdin;
         private boolean isEnvironmentExposed;
-        private List<String> sources;
+        private List<String> datasources;
         private Map<String, String> parameters;
         private Properties systemProperties;
         private Properties configuration;
@@ -302,7 +302,7 @@ public class Settings {
             this.systemProperties = new Properties();
             this.setInputEncoding(DEFAULT_CHARSET.name());
             this.setOutputEncoding(DEFAULT_CHARSET.name());
-            this.sources = emptyList();
+            this.datasources = emptyList();
             this.templateDirectories = emptyList();
         }
 
@@ -380,8 +380,8 @@ public class Settings {
             return this;
         }
 
-        public SettingsBuilder setSources(List<String> sources) {
-            this.sources = sources;
+        public SettingsBuilder setDatasources(List<String> datasources) {
+            this.datasources = datasources;
             return this;
         }
 
@@ -393,7 +393,7 @@ public class Settings {
         }
 
         public SettingsBuilder setSystemProperties(Properties systemProperties) {
-            if(systemProperties != null) {
+            if (systemProperties != null) {
                 this.systemProperties = systemProperties;
             }
             return this;
@@ -432,7 +432,7 @@ public class Settings {
                     LocaleUtils.parseLocale(currLocale),
                     isReadFromStdin,
                     isEnvironmentExposed,
-                    sources,
+                    datasources,
                     parameters,
                     systemProperties,
                     writer
diff --git a/freemarker-generator-cli/src/main/java/org/apache/freemarker/generator/cli/config/Suppliers.java b/freemarker-generator-cli/src/main/java/org/apache/freemarker/generator/cli/config/Suppliers.java
index 7d2f5f1..0a7a9f2 100644
--- a/freemarker-generator-cli/src/main/java/org/apache/freemarker/generator/cli/config/Suppliers.java
+++ b/freemarker-generator-cli/src/main/java/org/apache/freemarker/generator/cli/config/Suppliers.java
@@ -34,7 +34,7 @@ public class Suppliers {
     }
 
     public static DatasourcesSupplier datasourcesSupplier(Settings settings) {
-        return new DatasourcesSupplier(settings.getSources(),
+        return new DatasourcesSupplier(settings.getDatasources(),
                 settings.getInclude(),
                 settings.getExclude(),
                 settings.getInputEncoding());
diff --git a/freemarker-generator-cli/src/main/java/org/apache/freemarker/generator/cli/task/FreeMarkerTask.java b/freemarker-generator-cli/src/main/java/org/apache/freemarker/generator/cli/task/FreeMarkerTask.java
index f537309..b59bb62 100644
--- a/freemarker-generator-cli/src/main/java/org/apache/freemarker/generator/cli/task/FreeMarkerTask.java
+++ b/freemarker-generator-cli/src/main/java/org/apache/freemarker/generator/cli/task/FreeMarkerTask.java
@@ -37,6 +37,7 @@ import java.util.function.Supplier;
 
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static java.util.Objects.requireNonNull;
+import static org.apache.freemarker.generator.base.FreeMarkerConstants.DEFAULT_GROUP;
 import static org.apache.freemarker.generator.base.FreeMarkerConstants.Location.STDIN;
 import static org.apache.freemarker.generator.base.FreeMarkerConstants.Model.DATASOURCES;
 import static org.apache.freemarker.generator.cli.config.Suppliers.configurationSupplier;
@@ -89,7 +90,7 @@ public class FreeMarkerTask implements Callable<Integer> {
         // Add optional datasource from STDIN at the start of the list since
         // this allows easy sequence slicing in FreeMarker.
         if (settings.isReadFromStdin()) {
-            datasources.add(0, DatasourceFactory.create(STDIN, System.in, STDIN, UTF_8));
+            datasources.add(0, DatasourceFactory.create(STDIN, DEFAULT_GROUP, System.in, STDIN, UTF_8));
         }
 
         return new Datasources(datasources);
diff --git a/freemarker-generator-cli/src/test/java/org/apache/freemarker/generator/cli/ExamplesTest.java b/freemarker-generator-cli/src/test/java/org/apache/freemarker/generator/cli/ExamplesTest.java
index e5fa6ac..97f7001 100644
--- a/freemarker-generator-cli/src/test/java/org/apache/freemarker/generator/cli/ExamplesTest.java
+++ b/freemarker-generator-cli/src/test/java/org/apache/freemarker/generator/cli/ExamplesTest.java
@@ -26,7 +26,7 @@ import static org.junit.Assert.assertTrue;
 
 public class ExamplesTest extends AbstractMainTest {
 
-    private static final int MIN_OUTPUT_SIZE = 1;
+    private static final int MIN_OUTPUT_SIZE = 5;
 
     @Test
     public void shouldRunInfo() throws IOException {
@@ -102,6 +102,7 @@ public class ExamplesTest extends AbstractMainTest {
 
     @Test
     public void shouldRunInteractiveTemplateExamples() throws IOException {
+        // @TODO We should check the generated output directly
         assertValid(execute("-i ${JsonPathTool.parse(Datasources.first).read(\"$.info.title\")} site/sample/json/swagger-spec.json"));
         assertValid(execute("-i ${XmlTool.parse(Datasources.first)[\"recipients/person[1]/name\"]} site/sample/xml/recipients.xml"));
         assertValid(execute("-i ${JsoupTool.parse(Datasources.first).select(\"a\")[0]} site/sample/html/dependencies.html"));
@@ -129,5 +130,6 @@ public class ExamplesTest extends AbstractMainTest {
     private static void assertValid(String output) {
         assertTrue(output.length() > MIN_OUTPUT_SIZE);
         assertFalse(output.contains("Exception"));
+        assertFalse(output.contains("Error"));
     }
 }
diff --git a/freemarker-generator-cli/src/test/java/org/apache/freemarker/generator/cli/ManualTest.java b/freemarker-generator-cli/src/test/java/org/apache/freemarker/generator/cli/ManualTest.java
index 35b1069..d693905 100644
--- a/freemarker-generator-cli/src/test/java/org/apache/freemarker/generator/cli/ManualTest.java
+++ b/freemarker-generator-cli/src/test/java/org/apache/freemarker/generator/cli/ManualTest.java
@@ -35,7 +35,8 @@ public class ManualTest {
     // private static final String CMD = "-i ${JsoupTool.parse(Datasources.first).select('a')[0]} site/sample/html/dependencies.html";
     // private static final String CMD = "-b ./src/test -t templates/properties/csv/locker-test-users.ftl site/sample/properties";
     // private static final String CMD = "-b ./src/test -e UTF-8 -l de_AT -Dcolumn=Order%20ID -Dvalues=226939189,957081544 -Dformat=DEFAULT -Ddelimiter=COMMA -t templates/csv/md/filter.ftl site/sample/csv/sales-records.csv";
-    private static final String CMD = "-E -b ./src/test -t templates/environment.ftl";
+    // private static final String CMD = "-E -b ./src/test -t templates/environment.ftl";
+    private static final String CMD = "-b ./src/test -l de_AT -DFOO=foo -DBAR=bar -t templates/info.ftl -d user:admin=site/sample/csv/contract.csv#charset=UTF-16 google:www=https://www.google.com?foo=bar#contenttype=application/json";
 
     public static void main(String[] args) {
         Main.execute(toArgs(CMD));
diff --git a/freemarker-generator-cli/src/test/java/org/apache/freemarker/generator/cli/PicocliTest.java b/freemarker-generator-cli/src/test/java/org/apache/freemarker/generator/cli/PicocliTest.java
new file mode 100644
index 0000000..95662f0
--- /dev/null
+++ b/freemarker-generator-cli/src/test/java/org/apache/freemarker/generator/cli/PicocliTest.java
@@ -0,0 +1,74 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.freemarker.generator.cli;
+
+import org.junit.Test;
+import picocli.CommandLine;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+public class PicocliTest {
+
+    private static final String TEMPLATE = "template.ftl";
+    private static final String ANY_FILE = "users.csv";
+    private static final String ANY_NAMED_FILE = "users=users.csv";
+    private static final String OTHER_FILE = "transctions.csv";
+    private static final String ANY_FILE_URI = "file:///users.csv";
+    private static final String OTHER_FILE_URI = "file:///transctions.csv";
+
+    @Test
+    public void testSinglePositionalParameter() {
+        assertEquals(ANY_FILE_URI, parse("-t", TEMPLATE, ANY_FILE_URI).sources.get(0));
+        assertNull(ANY_FILE, parse("-t", TEMPLATE, ANY_FILE_URI).datasources);
+    }
+
+    @Test
+    public void testMultiplePositionalParameter() {
+        assertEquals(ANY_FILE, parse("-t", TEMPLATE, ANY_FILE, OTHER_FILE).sources.get(0));
+        assertEquals(OTHER_FILE, parse("-t", TEMPLATE, ANY_FILE, OTHER_FILE).sources.get(1));
+
+        assertEquals(ANY_FILE, parse("-t", TEMPLATE, ANY_FILE, OTHER_FILE_URI).sources.get(0));
+        assertEquals(OTHER_FILE_URI, parse("-t", TEMPLATE, ANY_FILE, OTHER_FILE_URI).sources.get(1));
+
+        assertEquals(ANY_FILE_URI, parse("-t", TEMPLATE, ANY_FILE_URI, OTHER_FILE_URI).sources.get(0));
+        assertEquals(OTHER_FILE_URI, parse("-t", TEMPLATE, ANY_FILE_URI, OTHER_FILE_URI).sources.get(1));
+    }
+
+    @Test
+    public void testSingleNamedDatasource() {
+        assertEquals(ANY_FILE, parse("-t", TEMPLATE, ANY_FILE).sources.get(0));
+        assertEquals(ANY_FILE, parse("-t", TEMPLATE, "-d", ANY_FILE).datasources.get(0));
+        assertEquals(ANY_FILE, parse("-t", TEMPLATE, "--datasource", ANY_FILE).datasources.get(0));
+        assertEquals(ANY_FILE_URI, parse("-t", TEMPLATE, "--datasource", ANY_FILE_URI).datasources.get(0));
+    }
+
+    @Test
+    public void testMultipleNamedDatasource() {
+        final Main main = parse("-t", TEMPLATE, "-d", ANY_FILE, "--datasource", OTHER_FILE_URI);
+
+        assertEquals(ANY_FILE, main.datasources.get(0));
+        assertEquals(OTHER_FILE_URI, main.datasources.get(1));
+        assertNull(main.sources);
+    }
+
+    private static Main parse(String... args) {
+        final Main main = new Main();
+        new CommandLine(main).parseArgs(args);
+        return main;
+    }
+}
diff --git a/freemarker-generator-cli/src/test/java/org/apache/freemarker/generator/cli/config/SettingsTest.java b/freemarker-generator-cli/src/test/java/org/apache/freemarker/generator/cli/config/SettingsTest.java
index 4821723..655fdf6 100644
--- a/freemarker-generator-cli/src/test/java/org/apache/freemarker/generator/cli/config/SettingsTest.java
+++ b/freemarker-generator-cli/src/test/java/org/apache/freemarker/generator/cli/config/SettingsTest.java
@@ -56,7 +56,7 @@ public class SettingsTest {
         assertEquals(ANY_OUTPUT_ENCODING, settings.getOutputEncoding().name());
         assertEquals(ANY_OUTPUT_FILE, settings.getOutputFile().getName());
         assertEquals(ANY_TEMPLATE_NAME, settings.getTemplateName());
-        assertNotNull(settings.getSources());
+        assertNotNull(settings.getDatasources());
         assertNotNull(settings.getParameters());
         assertNotNull(settings.getSytemProperties());
         assertTrue(settings.isReadFromStdin());
@@ -78,7 +78,7 @@ public class SettingsTest {
                 .setOutputEncoding(ANY_OUTPUT_ENCODING)
                 .setOutputFile(ANY_OUTPUT_FILE)
                 .setParameters(ANY_USER_PARAMETERS)
-                .setSources(ANY_SOURCES)
+                .setDatasources(ANY_SOURCES)
                 .setSystemProperties(ANY_SYSTEM_PROPERTIES)
                 .setTemplateName(ANY_TEMPLATE_NAME)
                 .setWriter(new StringWriter())
diff --git a/freemarker-generator-cli/templates/info.ftl b/freemarker-generator-cli/templates/info.ftl
index 3ec4891..6b9380b 100644
--- a/freemarker-generator-cli/templates/info.ftl
+++ b/freemarker-generator-cli/templates/info.ftl
@@ -16,7 +16,7 @@
   under the License.
 -->
 FreeMarker CLI Information
----------------------------------------------------------------------------
+------------------------------------------------------------------------------
 FreeMarker version     : ${.version}
 Template name          : ${.current_template_name}
 Language               : ${.lang}
@@ -26,13 +26,13 @@ Output encoding        : ${.output_encoding}
 Output format          : ${.output_format}
 
 FreeMarker CLI Template Directories
----------------------------------------------------------------------------
+------------------------------------------------------------------------------
 <#list SystemTool.getTemplateDirectories() as directory>
-[${directory?counter}] ${directory}
+[#${directory?counter}] ${directory}
 </#list>
 
 FreeMarker CLI Tools
----------------------------------------------------------------------------
+------------------------------------------------------------------------------
 <#list .data_model?keys?sort as key>
 <#if key?ends_with("Tool")>
 - ${key?right_pad(20)} : ${.data_model[key]}
@@ -40,25 +40,26 @@ FreeMarker CLI Tools
 </#list>
 
 FreeMarker CLI Datasources
----------------------------------------------------------------------------
+------------------------------------------------------------------------------
 <#list Datasources.list as datasource>
-[${datasource?counter}] ${datasource.name}, ${datasource.location}, ${datasource.length} Bytes
+[#${datasource?counter}], name=${datasource.name}, group=${datasource.group}, charset=${datasource.charset}, length= ${datasource.length} Bytes
+Location : ${datasource.location}
 </#list>
 
 User Supplied Parameters
----------------------------------------------------------------------------
+------------------------------------------------------------------------------
 <#list SystemTool.parameters as name,value>
 - ${name} ==> ${value}
 </#list>
 
 User Supplied System Properties
----------------------------------------------------------------------------
+------------------------------------------------------------------------------
 <#list SystemTool.userSystemProperties as name,value>
 - ${name} ==> ${value}
 </#list>
 
 SystemTool
----------------------------------------------------------------------------
+------------------------------------------------------------------------------
 Command line         : ${SystemTool.getCommandLineArgs()?join(", ")}
 Host Name            : ${SystemTool.getHostName()}
 Java Home            : ${SystemTool.getEnv("JAVA_HOME", "N.A.")}
diff --git a/freemarker-generator-maven-plugin/src/main/java/org/apache/freemarker/generator/maven/JsonPropertiesProvider.java b/freemarker-generator-maven-plugin/src/main/java/org/apache/freemarker/generator/maven/JsonPropertiesProvider.java
index f2e2cc4..1d16822 100644
--- a/freemarker-generator-maven-plugin/src/main/java/org/apache/freemarker/generator/maven/JsonPropertiesProvider.java
+++ b/freemarker-generator-maven-plugin/src/main/java/org/apache/freemarker/generator/maven/JsonPropertiesProvider.java
@@ -54,6 +54,7 @@ public class JsonPropertiesProvider implements OutputGeneratorPropertiesProvider
     }
 
     @Override
+    @SuppressWarnings("unchecked")
     public void providePropertiesFromFile(Path path, OutputGenerator.OutputGeneratorBuilder builder) {
         final File jsonDataFile = path.toFile();
         final Map<String, Object> data = parseJson(jsonDataFile);
diff --git a/freemarker-generator-tools/src/test/java/org/apache/freemarker/generator/tools/properties/PropertiesToolTest.java b/freemarker-generator-tools/src/test/java/org/apache/freemarker/generator/tools/properties/PropertiesToolTest.java
index 3a29908..5a9fc79 100644
--- a/freemarker-generator-tools/src/test/java/org/apache/freemarker/generator/tools/properties/PropertiesToolTest.java
+++ b/freemarker-generator-tools/src/test/java/org/apache/freemarker/generator/tools/properties/PropertiesToolTest.java
@@ -24,6 +24,7 @@ import static junit.framework.TestCase.assertEquals;
 
 public class PropertiesToolTest {
 
+    private static final String ANY_GROUP = "group";
     private static final String ANY_PROPERTIES_STRING = "foo=bar";
 
     @Test
@@ -43,6 +44,6 @@ public class PropertiesToolTest {
     }
 
     private Datasource datasource(String value) {
-        return DatasourceFactory.create("test.properties", value);
+        return DatasourceFactory.create("test.properties", ANY_GROUP, value);
     }
 }
diff --git a/freemarker-generator-tools/src/test/java/org/apache/freemarker/generator/tools/snakeyaml/SnakeYamlToolTest.java b/freemarker-generator-tools/src/test/java/org/apache/freemarker/generator/tools/snakeyaml/SnakeYamlToolTest.java
index ee34a28..90be879 100644
--- a/freemarker-generator-tools/src/test/java/org/apache/freemarker/generator/tools/snakeyaml/SnakeYamlToolTest.java
+++ b/freemarker-generator-tools/src/test/java/org/apache/freemarker/generator/tools/snakeyaml/SnakeYamlToolTest.java
@@ -27,6 +27,8 @@ import static junit.framework.TestCase.assertEquals;
 
 public class SnakeYamlToolTest {
 
+    private static final String ANY_GROUP = "group";
+
     private static final String ANY_YAML_STRING = "docker:\n" +
             "    - image: ubuntu:14.04\n" +
             "    - image: mongo:2.6.8\n" +
@@ -56,6 +58,6 @@ public class SnakeYamlToolTest {
     }
 
     private Datasource datasource(String value) {
-        return DatasourceFactory.create("test.yml", value);
+        return DatasourceFactory.create("test.yml", ANY_GROUP, value);
     }
 }
diff --git a/freemarker-generator-tools/src/test/java/org/apache/freemarker/generator/tools/xml/XmlToolTest.java b/freemarker-generator-tools/src/test/java/org/apache/freemarker/generator/tools/xml/XmlToolTest.java
index 79a5432..c2b16fa 100644
--- a/freemarker-generator-tools/src/test/java/org/apache/freemarker/generator/tools/xml/XmlToolTest.java
+++ b/freemarker-generator-tools/src/test/java/org/apache/freemarker/generator/tools/xml/XmlToolTest.java
@@ -26,6 +26,8 @@ import static junit.framework.TestCase.assertNotNull;
 
 public class XmlToolTest {
 
+    private static final String ANY_GROUP = "group";
+
     private static final String ANY_XML_STRING = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
             "<note>\n" +
             "  <to>Tove</to>\n" +
@@ -57,6 +59,6 @@ public class XmlToolTest {
     }
 
     private Datasource datasource(String value) {
-        return DatasourceFactory.create("test.xml", value);
+        return DatasourceFactory.create("test.xml", ANY_GROUP, value);
     }
 }