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Java > Open Source Codes > org > apache > tools > ant > taskdefs > GZip


1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  *
17  */
18
19 package org.apache.tools.ant.taskdefs;
20
21 import java.io.FileOutputStream JavaDoc;
22 import java.io.IOException JavaDoc;
23 import java.util.zip.GZIPOutputStream JavaDoc;
24 import org.apache.tools.ant.BuildException;
25 import org.apache.tools.ant.util.FileUtils;
26
27 /**
28  * Compresses a file with the GZIP algorithm. Normally used to compress
29  * non-compressed archives such as TAR files.
30  *
31  * @since Ant 1.1
32  *
33  * @ant.task category="packaging"
34  */
35
36 public class GZip extends Pack {
37     /**
38      * perform the GZip compression operation.
39      */
40     protected void pack() {
41         GZIPOutputStream JavaDoc zOut = null;
42         try {
43             zOut = new GZIPOutputStream JavaDoc(new FileOutputStream JavaDoc(zipFile));
44             zipResource(getSrcResource(), zOut);
45         } catch (IOException JavaDoc ioe) {
46             String JavaDoc msg = "Problem creating gzip " + ioe.getMessage();
47             throw new BuildException(msg, ioe, getLocation());
48         } finally {
49             FileUtils.close(zOut);
50         }
51     }
52
53     /**
54      * Whether this task can deal with non-file resources.
55      *
56      * <p>This implementation returns true only if this task is
57      * &lt;gzip&gt;. Any subclass of this class that also wants to
58      * support non-file resources needs to override this method. We
59      * need to do so for backwards compatibility reasons since we
60      * can't expect subclasses to support resources.</p>
61      * @return true if this case supports non file resources.
62      * @since Ant 1.7
63      */
64     protected boolean supportsNonFileResources() {
65         return getClass().equals(GZip.class);
66     }
67 }
68
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