JarFileLocator


1   /**
2    * JOnAS: Java(TM) Open Application Server
3    * Copyright (C) 1999 Bull S.A.
4    * Contact: jonas-team@objectweb.org
5    *
6    * This library is free software; you can redistribute it and/or
7    * modify it under the terms of the GNU Lesser General Public
8    * License as published by the Free Software Foundation; either
9    * version 2.1 of the License, or any later version.
10   *
11   * This library is distributed in the hope that it will be useful,
12   * but WITHOUT ANY WARRANTY; without even the implied warranty of
13   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14   * Lesser General Public License for more details.
15   *
16   * You should have received a copy of the GNU Lesser General Public
17   * License along with this library; if not, write to the Free Software
18   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
19   * USA
20   *
21   * Initial developer(s): Guillaume SAUTHIER
22   * --------------------------------------------------------------------------
23   * $Id: JarFileLocator.java,v 1.2 2004/04/19 13:49:09 sauthieg Exp $
24   * --------------------------------------------------------------------------
25   */
26  package org.objectweb.jonas_lib.loader.locator;
27  
28  import java.io.IOException  ;
29  import java.net.URL  ;
30  import java.util.Enumeration  ;
31  import java.util.List  ;
32  import java.util.Vector  ;
33  import java.util.jar.JarFile  ;
34  import java.util.zip.ZipEntry  ;
35  
36  /**
37   * A <code>JarfileLocator</code> is used to look up for a file inside a Jar
38   * archive. Works only for local jars.
39   *
40   * @author Guillaume Sauthier
41   */
42  public class JarFileLocator extends Locator {
43  
44      /**
45       * Wrapped JarFile where searchs will be performed
46       */
47      private JarFile   file = null;
48  
49      /**
50       * Construct a new JarFileLocator from an URL representing a Jar.
51       *
52       * @param jar URL pointing to a Jar file
53       *
54       * @throws IOException When URL is not a JarFile.
55       */
56      public JarFileLocator(URL   jar) throws IOException   {
57          String   filename = jar.getFile();
58          file = new JarFile  (filename);
59      }
60  
61      /**
62       * Returns true when file was found.
63       *
64       * @param path the path to the file to look up
65       *
66       * @return true when file was found, otherwise false.
67       */
68      public boolean hasFile(String   path) {
69  
70          ZipEntry   entry = file.getEntry(path);
71          return (entry != null);
72      }
73  
74      /**
75       * Returns true when directory was found.
76       *
77       * @param path the path to the directory to look up
78       *
79       * @return true when directory was found, otherwise false.
80       */
81      public boolean hasDirectory(String   path) {
82  
83          boolean found = false;
84          for (Enumeration   e = file.entries(); e.hasMoreElements() && !found;) {
85              ZipEntry   entry = (ZipEntry  ) e.nextElement();
86              if (entry.getName().startsWith(path)) {
87                  return true;
88              }
89          }
90  
91          return false;
92      }
93  
94      /**
95       * Returns a list of filename stored in path.
96       *
97       * @param path the path to the directory where looking for files
98       *
99       * @return a list of filename stored in path.
100      */
101     public List   listContent(String   path) {
102 
103         List   libs = new Vector  ();
104         for (Enumeration   e = file.entries(); e.hasMoreElements();) {
105             ZipEntry   entry = (ZipEntry  ) e.nextElement();
106             if (entry.getName().startsWith(path)) {
107                 libs.add(entry.getName());
108             }
109         }
110 
111         return libs;
112     }
113 
114 }
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