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Posted to commits@tapestry.apache.org by hl...@apache.org on 2010/04/19 16:00:09 UTC
svn commit: r935575 - in /tapestry/tapestry5/trunk/tapestry-ioc/src:
main/java/org/apache/tapestry5/ioc/internal/util/FunctionalCollections.java
test/java/org/apache/tapestry5/ioc/internal/util/FunctionalCollectionsTest.java
Author: hlship
Date: Mon Apr 19 14:00:08 2010
New Revision: 935575
URL: http://svn.apache.org/viewvc?rev=935575&view=rev
Log:
Add the start of a collection of functional operations for collections
Added:
tapestry/tapestry5/trunk/tapestry-ioc/src/main/java/org/apache/tapestry5/ioc/internal/util/FunctionalCollections.java (with props)
tapestry/tapestry5/trunk/tapestry-ioc/src/test/java/org/apache/tapestry5/ioc/internal/util/FunctionalCollectionsTest.java (with props)
Added: tapestry/tapestry5/trunk/tapestry-ioc/src/main/java/org/apache/tapestry5/ioc/internal/util/FunctionalCollections.java
URL: http://svn.apache.org/viewvc/tapestry/tapestry5/trunk/tapestry-ioc/src/main/java/org/apache/tapestry5/ioc/internal/util/FunctionalCollections.java?rev=935575&view=auto
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--- tapestry/tapestry5/trunk/tapestry-ioc/src/main/java/org/apache/tapestry5/ioc/internal/util/FunctionalCollections.java (added)
+++ tapestry/tapestry5/trunk/tapestry-ioc/src/main/java/org/apache/tapestry5/ioc/internal/util/FunctionalCollections.java Mon Apr 19 14:00:08 2010
@@ -0,0 +1,53 @@
+// Copyright 2010 The Apache Software Foundation
+//
+// Licensed 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.tapestry5.ioc.internal.util;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tapestry5.ioc.services.Coercion;
+
+/**
+ * Functional operations on collections with generics support. Tending to use the equivalent names from
+ * Clojure.
+ *
+ * @since 5.2.0
+ */
+public class FunctionalCollections
+{
+
+ /**
+ * Functional map (i.e., transform operation) from a List<S&g;t to List<T>.
+ */
+ public static <S, T> List<T> map(List<S> source, Coercion<S, T> coercion)
+ {
+ Defense.notNull(source, "source");
+ Defense.notNull(coercion, "coercion");
+
+ int count = source.size();
+
+ List<T> result = new ArrayList<T>(count);
+
+ for (S s : source)
+ {
+ T t = coercion.coerce(s);
+
+ result.add(t);
+ }
+
+ return result;
+ }
+
+}
Propchange: tapestry/tapestry5/trunk/tapestry-ioc/src/main/java/org/apache/tapestry5/ioc/internal/util/FunctionalCollections.java
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Added: tapestry/tapestry5/trunk/tapestry-ioc/src/test/java/org/apache/tapestry5/ioc/internal/util/FunctionalCollectionsTest.java
URL: http://svn.apache.org/viewvc/tapestry/tapestry5/trunk/tapestry-ioc/src/test/java/org/apache/tapestry5/ioc/internal/util/FunctionalCollectionsTest.java?rev=935575&view=auto
==============================================================================
--- tapestry/tapestry5/trunk/tapestry-ioc/src/test/java/org/apache/tapestry5/ioc/internal/util/FunctionalCollectionsTest.java (added)
+++ tapestry/tapestry5/trunk/tapestry-ioc/src/test/java/org/apache/tapestry5/ioc/internal/util/FunctionalCollectionsTest.java Mon Apr 19 14:00:08 2010
@@ -0,0 +1,43 @@
+// Copyright 2010 The Apache Software Foundation
+//
+// Licensed 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.tapestry5.ioc.internal.util;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.apache.tapestry5.ioc.services.Coercion;
+import org.apache.tapestry5.ioc.test.TestBase;
+import org.testng.annotations.Test;
+
+public class FunctionalCollectionsTest extends TestBase
+{
+ @Test
+ public void map()
+ {
+ List<String> source = Arrays.asList("Mary", "had", "a", "little", "lamb");
+
+ Coercion<String, Integer> stringToLength = new Coercion<String, Integer>()
+ {
+ public Integer coerce(String input)
+ {
+ return input.length();
+ }
+ };
+
+ List<Integer> lengths = FunctionalCollections.map(source, stringToLength);
+
+ assertListsEquals(lengths, 4, 3, 1, 6, 4);
+ }
+}
Propchange: tapestry/tapestry5/trunk/tapestry-ioc/src/test/java/org/apache/tapestry5/ioc/internal/util/FunctionalCollectionsTest.java
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