SystemBundleLoader


1   /*******************************************************************************
2    * Copyright (c) 2003, 2005 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    * 
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  
12  package org.eclipse.osgi.framework.internal.core;
13  
14  import java.io.IOException  ;
15  import java.net.URL  ;
16  import java.util.*;
17  import org.eclipse.osgi.service.resolver.ExportPackageDescription;
18  import org.osgi.framework.BundleException;
19  
20  /**
21   * The System Bundle's BundleLoader.  This BundleLoader is used by ImportClassLoaders
22   * to load a resource that is exported by the System Bundle.
23   */
24  public class SystemBundleLoader extends BundleLoader {
25      public static final String   EQUINOX_EE = "x-equinox-ee"; //$NON-NLS-1$
26      ClassLoader   classLoader;
27      private HashSet eePackages;
28  
29      /**
30       * @param bundle The system bundle.
31       * @param proxy The BundleLoaderProxy for the system bundle
32       * @throws BundleException On any error.
33       */
34      protected SystemBundleLoader(BundleHost bundle, BundleLoaderProxy proxy) throws BundleException {
35          super(bundle, proxy);
36          ExportPackageDescription[] exports = proxy.getBundleDescription().getSelectedExports();
37          if (exports != null && exports.length > 0) {
38              eePackages = new HashSet(exports.length);
39              for (int i = 0; i < exports.length; i++)
40                  if (((Integer  ) exports[i].getDirective(EQUINOX_EE)).intValue() >= 0)
41                      eePackages.add(exports[i].getName());
42          }
43          this.classLoader = getClass().getClassLoader();
44      }
45  
46      /**
47       * The ClassLoader that loads OSGi framework classes is used to find the class.
48       */
49      public Class   findClass(String   name) throws ClassNotFoundException   {
50          return classLoader.loadClass(name);
51      }
52  
53      /**
54       * This method will always return null.
55       */
56      public String   findLibrary(String   name) {
57          return null;
58      }
59  
60      /**
61       * The ClassLoader that loads OSGi framework classes is used to find the class. 
62       */
63      Class   findLocalClass(String   name) {
64          Class   clazz = null;
65          try {
66              clazz = classLoader.loadClass(name);
67          } catch (ClassNotFoundException   e) {
68              // Do nothing, will return null
69          }
70          return clazz;
71      }
72  
73      /**
74       * The ClassLoader that loads OSGi framework classes is used to find the resource.
75       */
76      URL   findLocalResource(String   name) {
77          return classLoader.getResource(name);
78      }
79  
80      /**
81       * The ClassLoader that loads OSGi framework classes is used to find the resource.
82       */
83      Enumeration findLocalResources(String   name) {
84          try {
85              return classLoader.getResources(name);
86          } catch (IOException   e) {
87              return null;
88          }
89      }
90  
91      /**
92       * The ClassLoader that loads OSGi framework classes is used to find the resource.
93       */
94      public URL   findResource(String   name) {
95          return classLoader.getResource(name);
96      }
97  
98      /**
99       * The ClassLoader that loads OSGi framework classes is used to find the resource.
100      */
101     public Enumeration findResources(String   name) throws IOException   {
102         return classLoader.getResources(name);
103     }
104 
105     /**
106      * Do nothing on a close.
107      */
108     protected void close() {
109         // Do nothing.
110     }
111 
112     public boolean isEEPackage(String   pkgName) {
113         return eePackages.contains(pkgName);
114     }
115 }
116
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