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Posted to commits@commons.apache.org by se...@apache.org on 2009/04/03 02:35:43 UTC
svn commit: r761492 - in /commons/proper/compress/trunk/src:
main/java/org/apache/commons/compress/compressors/gzip/GzipUtils.java
test/java/org/apache/commons/compress/compressors/GzipUtilsTestCase.java
Author: sebb
Date: Fri Apr 3 00:35:43 2009
New Revision: 761492
URL: http://svn.apache.org/viewvc?rev=761492&view=rev
Log:
COMPRESS-68 Filename suffix mappings for compression formats
Added:
commons/proper/compress/trunk/src/main/java/org/apache/commons/compress/compressors/gzip/GzipUtils.java (with props)
commons/proper/compress/trunk/src/test/java/org/apache/commons/compress/compressors/GzipUtilsTestCase.java (with props)
Added: commons/proper/compress/trunk/src/main/java/org/apache/commons/compress/compressors/gzip/GzipUtils.java
URL: http://svn.apache.org/viewvc/commons/proper/compress/trunk/src/main/java/org/apache/commons/compress/compressors/gzip/GzipUtils.java?rev=761492&view=auto
==============================================================================
--- commons/proper/compress/trunk/src/main/java/org/apache/commons/compress/compressors/gzip/GzipUtils.java (added)
+++ commons/proper/compress/trunk/src/main/java/org/apache/commons/compress/compressors/gzip/GzipUtils.java Fri Apr 3 00:35:43 2009
@@ -0,0 +1,140 @@
+/*
+ * 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.commons.compress.compressors.gzip;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Utility code for the gzip compression format.
+ */
+public class GzipUtils {
+
+ /**
+ * Map from common filename suffixes to the suffixes that identify gzipped
+ * versions of those file types. For example: from ".tar" to ".tgz".
+ */
+ private static final Map compressSuffix = new HashMap();
+
+ /**
+ * Map from common filename suffixes of gzipped files to the corresponding
+ * suffixes of uncompressed files. For example: from ".tgz" to ".tar".
+ * <p>
+ * This map also contains gzip-specific suffixes like ".gz" and "-z".
+ * These suffixes are mapped to the empty string, as they should simply
+ * be removed from the filename when the file is uncompressed.
+ */
+ private static final Map uncompressSuffix = new HashMap();
+
+ static {
+ compressSuffix.put(".tar", ".tgz");
+ compressSuffix.put(".svg", ".svgz");
+ compressSuffix.put(".cpio", ".cpgz");
+ compressSuffix.put(".wmf", ".wmz");
+ compressSuffix.put(".emf", ".emz");
+
+ uncompressSuffix.put(".tgz", ".tar");
+ uncompressSuffix.put(".taz", ".tar");
+ uncompressSuffix.put(".svgz", ".svg");
+ uncompressSuffix.put(".cpgz", ".cpio");
+ uncompressSuffix.put(".wmz", ".wmf");
+ uncompressSuffix.put(".emz", ".emf");
+ uncompressSuffix.put(".gz", "");
+ uncompressSuffix.put(".z", "");
+ uncompressSuffix.put("-gz", "");
+ uncompressSuffix.put("-z", "");
+ uncompressSuffix.put("_z", "");
+ }
+ // N.B. if any shorter or longer keys are added, ensure the for loop limits are changed
+
+ /** Private constructor to prevent instantiation of this utility class. */
+ private GzipUtils() {
+ }
+
+ /**
+ * Detects common gzip suffixes in the given filename.
+ *
+ * @param filename name of a file
+ * @return <code>true</code> if the filename has a common gzip suffix,
+ * <code>false</code> otherwise
+ */
+ public static boolean isCompressedFilename(String filename) {
+ String lower = filename.toLowerCase();
+ int n = lower.length();
+ // Shortest suffix is two letters (_z), longest is five (.svgz)
+ for (int i = 2; i <= 5 && i < n; i++) {
+ if (uncompressSuffix.containsKey(lower.substring(n - i))) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * Maps the given name of a gzip-compressed file to the name that the
+ * file should have after uncompression. Commonly used file type specific
+ * suffixes like ".tgz" or ".svgz" are automatically detected and
+ * correctly mapped. For example the name "package.tgz" is mapped to
+ * "package.tar". And any filenames with the generic ".gz" suffix
+ * (or any other generic gzip suffix) is mapped to a name without that
+ * suffix. If no gzip suffix is detected, then the filename is returned
+ * unmapped.
+ *
+ * @param filename name of a file
+ * @return name of the corresponding uncompressed file
+ */
+ public static String getUncompressedFilename(String filename) {
+ String lower = filename.toLowerCase();
+ int n = lower.length();
+ // Shortest suffix is two letters (_z), longest is five (.svgz)
+ for (int i = 2; i <= 5 && i < n; i++) {
+ Object suffix = uncompressSuffix.get(lower.substring(n - i));
+ if (suffix != null) {
+ return filename.substring(0, n - i) + suffix;
+ }
+ }
+ return filename;
+ }
+
+ /**
+ * Maps the given filename to the name that the file should have after
+ * compression with gzip. Common file types with custom suffixes for
+ * compressed versions are automatically detected and correctly mapped.
+ * For example the name "package.tar" is mapped to "package.tgz". If no
+ * custom mapping is applicable, then the default ".gz" suffix is appended
+ * to the filename.
+ *
+ * @param filename name of a file
+ * @return name of the corresponding compressed file
+ */
+ public static String getCompressedFilename(String filename) {
+ String lower = filename.toLowerCase();
+ int n = lower.length();
+ // Shortest suffix is four letters (.svg), longest is five (.cpio)
+ for (int i = 4; i <= 5 && i < n; i++) {
+ Object suffix = compressSuffix.get(lower.substring(n - i));
+ if (suffix != null) {
+ return filename.substring(0, n - i) + suffix;
+ }
+ }
+ // No custom suffix found, just append the default .gz
+ return filename + ".gz";
+ }
+
+}
Propchange: commons/proper/compress/trunk/src/main/java/org/apache/commons/compress/compressors/gzip/GzipUtils.java
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svn:eol-style = native
Propchange: commons/proper/compress/trunk/src/main/java/org/apache/commons/compress/compressors/gzip/GzipUtils.java
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svn:keywords = Author Date Id Revision
Added: commons/proper/compress/trunk/src/test/java/org/apache/commons/compress/compressors/GzipUtilsTestCase.java
URL: http://svn.apache.org/viewvc/commons/proper/compress/trunk/src/test/java/org/apache/commons/compress/compressors/GzipUtilsTestCase.java?rev=761492&view=auto
==============================================================================
--- commons/proper/compress/trunk/src/test/java/org/apache/commons/compress/compressors/GzipUtilsTestCase.java (added)
+++ commons/proper/compress/trunk/src/test/java/org/apache/commons/compress/compressors/GzipUtilsTestCase.java Fri Apr 3 00:35:43 2009
@@ -0,0 +1,100 @@
+/*
+ * 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.commons.compress.compressors;
+
+import org.apache.commons.compress.compressors.gzip.GzipUtils;
+
+import junit.framework.TestCase;
+
+public class GzipUtilsTestCase extends TestCase {
+
+ public void testIsCompressedFilename() {
+ assertFalse(GzipUtils.isCompressedFilename(""));
+ assertFalse(GzipUtils.isCompressedFilename(".gz"));
+
+ assertTrue(GzipUtils.isCompressedFilename("x.tgz"));
+ assertTrue(GzipUtils.isCompressedFilename("x.taz"));
+ assertTrue(GzipUtils.isCompressedFilename("x.svgz"));
+ assertTrue(GzipUtils.isCompressedFilename("x.cpgz"));
+ assertTrue(GzipUtils.isCompressedFilename("x.wmz"));
+ assertTrue(GzipUtils.isCompressedFilename("x.emz"));
+ assertTrue(GzipUtils.isCompressedFilename("x.gz"));
+ assertTrue(GzipUtils.isCompressedFilename("x.z"));
+ assertTrue(GzipUtils.isCompressedFilename("x-gz"));
+ assertTrue(GzipUtils.isCompressedFilename("x-z"));
+ assertTrue(GzipUtils.isCompressedFilename("x_z"));
+
+ assertFalse(GzipUtils.isCompressedFilename("xxgz"));
+ assertFalse(GzipUtils.isCompressedFilename("xzz"));
+ assertFalse(GzipUtils.isCompressedFilename("xaz"));
+
+ assertTrue(GzipUtils.isCompressedFilename("x.SVGZ"));
+ assertTrue(GzipUtils.isCompressedFilename("x.Svgz"));
+ assertTrue(GzipUtils.isCompressedFilename("x.svGZ"));
+
+ assertFalse(GzipUtils.isCompressedFilename("x.wmz "));
+ assertFalse(GzipUtils.isCompressedFilename("x.wmz\n"));
+ assertFalse(GzipUtils.isCompressedFilename("x.wmz.y"));
+ }
+
+ public void testGetUncompressedFilename() {
+ assertEquals("", GzipUtils.getUncompressedFilename(""));
+ assertEquals(".gz", GzipUtils.getUncompressedFilename(".gz"));
+
+ assertEquals("x.tar", GzipUtils.getUncompressedFilename("x.tgz"));
+ assertEquals("x.tar", GzipUtils.getUncompressedFilename("x.taz"));
+ assertEquals("x.svg", GzipUtils.getUncompressedFilename("x.svgz"));
+ assertEquals("x.cpio", GzipUtils.getUncompressedFilename("x.cpgz"));
+ assertEquals("x.wmf", GzipUtils.getUncompressedFilename("x.wmz"));
+ assertEquals("x.emf", GzipUtils.getUncompressedFilename("x.emz"));
+ assertEquals("x", GzipUtils.getUncompressedFilename("x.gz"));
+ assertEquals("x", GzipUtils.getUncompressedFilename("x.z"));
+ assertEquals("x", GzipUtils.getUncompressedFilename("x-gz"));
+ assertEquals("x", GzipUtils.getUncompressedFilename("x-z"));
+ assertEquals("x", GzipUtils.getUncompressedFilename("x_z"));
+
+ assertEquals("x.svg", GzipUtils.getUncompressedFilename("x.SVGZ"));
+ assertEquals("X.svg", GzipUtils.getUncompressedFilename("X.SVGZ"));
+ assertEquals("X.svg", GzipUtils.getUncompressedFilename("X.svGZ"));
+
+ assertEquals("x.wmz ", GzipUtils.getUncompressedFilename("x.wmz "));
+ assertEquals("x.wmz\n", GzipUtils.getUncompressedFilename("x.wmz\n"));
+ assertEquals("x.wmz.y", GzipUtils.getUncompressedFilename("x.wmz.y"));
+ }
+
+ public void testGetCompressedFilename() {
+ assertEquals(".gz", GzipUtils.getCompressedFilename(""));
+ assertEquals("x.gz", GzipUtils.getCompressedFilename("x"));
+
+ assertEquals("x.tgz", GzipUtils.getCompressedFilename("x.tar"));
+ assertEquals("x.svgz", GzipUtils.getCompressedFilename("x.svg"));
+ assertEquals("x.cpgz", GzipUtils.getCompressedFilename("x.cpio"));
+ assertEquals("x.wmz", GzipUtils.getCompressedFilename("x.wmf"));
+ assertEquals("x.emz", GzipUtils.getCompressedFilename("x.emf"));
+
+ assertEquals("x.svgz", GzipUtils.getCompressedFilename("x.SVG"));
+ assertEquals("X.svgz", GzipUtils.getCompressedFilename("X.SVG"));
+ assertEquals("X.svgz", GzipUtils.getCompressedFilename("X.svG"));
+
+ assertEquals("x.wmf .gz", GzipUtils.getCompressedFilename("x.wmf "));
+ assertEquals("x.wmf\n.gz", GzipUtils.getCompressedFilename("x.wmf\n"));
+ assertEquals("x.wmf.y.gz", GzipUtils.getCompressedFilename("x.wmf.y"));
+ }
+
+}
Propchange: commons/proper/compress/trunk/src/test/java/org/apache/commons/compress/compressors/GzipUtilsTestCase.java
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