KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > objectweb > asm > optimizer > JarOptimizer


1 /***
2  * ASM: a very small and fast Java bytecode manipulation framework
3  * Copyright (c) 2000-2005 INRIA, France Telecom
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  * notice, this list of conditions and the following disclaimer in the
13  * documentation and/or other materials provided with the distribution.
14  * 3. Neither the name of the copyright holders nor the names of its
15  * contributors may be used to endorse or promote products derived from
16  * this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28  * THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 package org.objectweb.asm.optimizer;
31
32 import java.io.File JavaDoc;
33 import java.io.FileOutputStream JavaDoc;
34 import java.io.IOException JavaDoc;
35 import java.io.InputStream JavaDoc;
36 import java.util.Enumeration JavaDoc;
37 import java.util.zip.ZipEntry JavaDoc;
38 import java.util.zip.ZipFile JavaDoc;
39 import java.util.zip.ZipOutputStream JavaDoc;
40
41 /**
42  * A Jar file optimizer.
43  *
44  * @author Eric Bruneton
45  */
46 public class JarOptimizer {
47
48     public static void main(final String JavaDoc[] args) throws IOException JavaDoc {
49         File JavaDoc f = new File JavaDoc(args[0]);
50         optimize(f);
51     }
52
53     static void optimize(final File JavaDoc f) throws IOException JavaDoc {
54         if (f.isDirectory()) {
55             File JavaDoc[] files = f.listFiles();
56             for (int i = 0; i < files.length; ++i) {
57                 optimize(files[i]);
58             }
59         } else if (f.getName().endsWith(".jar")) {
60             File JavaDoc g = new File JavaDoc(f.getParentFile(), f.getName() + ".new");
61             ZipFile JavaDoc zf = new ZipFile JavaDoc(f);
62             ZipOutputStream JavaDoc out = new ZipOutputStream JavaDoc(new FileOutputStream JavaDoc(g));
63             Enumeration JavaDoc e = zf.entries();
64             byte[] buf = new byte[10000];
65             while (e.hasMoreElements()) {
66                 ZipEntry JavaDoc ze = (ZipEntry JavaDoc) e.nextElement();
67                 if (ze.isDirectory()) {
68                     continue;
69                 }
70                 out.putNextEntry(ze);
71                 InputStream JavaDoc is = zf.getInputStream(ze);
72                 int n;
73                 do {
74                     n = is.read(buf, 0, buf.length);
75                     if (n != -1) {
76                         out.write(buf, 0, n);
77                     }
78                 } while (n != -1);
79                 out.closeEntry();
80             }
81             out.close();
82             zf.close();
83             f.delete();
84             g.renameTo(f);
85         }
86     }
87 }
88
Popular Tags