RegistryCompatibilityHelper


1   /*******************************************************************************
2    * Copyright (c) 2006 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  package org.eclipse.core.internal.registry;
12  
13  import java.lang.reflect.Method  ;
14  import org.eclipse.core.runtime.IPluginDescriptor;
15  import org.osgi.framework.Bundle;
16  
17  /**
18   * This class isolates calls to the backward compatibility layer.
19   * It uses reflection so it can be loaded with success even in the absence of
20   * the compatibility plugin.
21   * 
22   * @deprecated Marked as deprecated to suppress deprecation warnings.
23   */
24  public class RegistryCompatibilityHelper {
25      public static final String   PI_RUNTIME_COMPATIBILITY = "org.eclipse.core.runtime.compatibility"; //$NON-NLS-1$
26      private static Bundle compatibility = null;
27  
28      public synchronized static Bundle initializeCompatibility() {
29          // if compatibility is stale (has been uninstalled or unresolved) 
30          // then we try to get a new resolved compatibility bundle
31          if (compatibility == null || (compatibility.getState() & (Bundle.INSTALLED | Bundle.UNINSTALLED | Bundle.STOPPING)) != 0) {
32              compatibility = BundleHelper.getDefault().getBundle(PI_RUNTIME_COMPATIBILITY);
33          }
34          return compatibility;
35      }
36  
37      public synchronized static IPluginDescriptor getPluginDescriptor(String   pluginId) {
38          //Here we use reflection so the runtime code can run without the compatibility
39          initializeCompatibility();
40          if (compatibility == null)
41              throw new IllegalStateException  ();
42  
43          Class   oldInternalPlatform = null;
44          try {
45              oldInternalPlatform = compatibility.loadClass("org.eclipse.core.internal.plugins.InternalPlatform"); //$NON-NLS-1$
46              Method   getPluginDescriptor = oldInternalPlatform.getMethod("getPluginDescriptor", new Class  [] {String  .class}); //$NON-NLS-1$
47              return (IPluginDescriptor) getPluginDescriptor.invoke(oldInternalPlatform, new Object  [] {pluginId});
48          } catch (Exception   e) {
49              //Ignore the exceptions, return null            
50          }
51          return null;
52      }
53  }
54
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