BundleURLConnection


1   /*******************************************************************************
2    * Copyright (c) 2004 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials 
4    * are made available under the terms of the Common Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/cpl-v10.html
7    * 
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  
12  package org.eclipse.osgi.framework.adaptor.core;
13  
14  import java.io.IOException  ;
15  import java.io.InputStream  ;
16  import java.net.*;
17  
18  /**
19   * URLConnection for BundleClassLoader resources.
20   */
21  
22  public class BundleURLConnection extends URLConnection {
23      /** BundleEntry that the URL is associated. */
24      protected final BundleEntry bundleEntry;
25  
26      /** InputStream for this URLConnection. */
27      protected InputStream   in;
28  
29      /** content type for this URLConnection */
30      protected String   contentType;
31  
32      /**
33       * Constructor for a BundleClassLoader resource URLConnection.
34       *
35       * @param url  URL for this URLConnection.
36       * @param bundleEntry  BundleEntry that the URLConnection is associated.
37       */
38      public BundleURLConnection(URL url, BundleEntry bundleEntry) {
39          super(url);
40  
41          this.bundleEntry = bundleEntry;
42          this.in = null;
43          this.contentType = null;
44      }
45  
46      public synchronized void connect() throws IOException   {
47          if (!connected) {
48              if (bundleEntry != null) {
49                  in = bundleEntry.getInputStream();
50                  connected = true;
51              } else {
52                  throw new IOException  (AdaptorMsg.formatter.getString("RESOURCE_NOT_FOUND_EXCEPTION", url)); //$NON-NLS-1$
53              }
54          }
55      }
56  
57      public int getContentLength() {
58          return ((int) bundleEntry.getSize());
59      }
60  
61      public String   getContentType() {
62          if (contentType == null) {
63              contentType = guessContentTypeFromName(bundleEntry.getName());
64  
65              if (contentType == null) {
66                  if (!connected) {
67                      try {
68                          connect();
69                      } catch (IOException   e) {
70                          return (null);
71                      }
72                  }
73                  try {
74                      if (in.markSupported())
75                          contentType = guessContentTypeFromStream(in);
76                  } catch (IOException   e) {
77                  }
78              }
79          }
80  
81          return (contentType);
82      }
83  
84      public boolean getDoInput() {
85          return (true);
86      }
87  
88      public boolean getDoOutput() {
89          return (false);
90      }
91  
92      public InputStream   getInputStream() throws IOException   {
93          if (!connected) {
94              connect();
95          }
96  
97          return (in);
98      }
99  
100     public long getLastModified() {
101         long lastModified = bundleEntry.getTime();
102 
103         if (lastModified == -1) {
104             return (0);
105         }
106 
107         return (lastModified);
108     }
109 
110     /**
111      * Converts the URL to a common local URL protocol (i.e file: or jar: protocol)
112      * @return the local URL using a common local protocol
113      */
114     public URL getLocalURL() {
115         return bundleEntry.getLocalURL();
116     }
117 
118     /**
119      * Converts the URL to a URL that uses the file: protocol.  The content of this
120      * URL may be downloaded or extracted onto the local filesystem to create a file URL.
121      * @return the local URL that uses the file: protocol
122      */
123     public URL getFileURL() {
124         return bundleEntry.getFileURL();
125     }
126 }
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