FlushableExtension


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  package org.eclipse.core.internal.registry;
12  
13  import java.lang.ref.SoftReference  ;
14  import org.eclipse.core.runtime.IConfigurationElement;
15  
16  public class FlushableExtension extends Extension {
17  
18      public FlushableExtension() {
19          super();
20      }
21  
22      public IConfigurationElement[] getConfigurationElements() {
23          synchronized (this) {
24              if (!fullyLoaded) {
25                  fullyLoaded = true;
26                  RegistryCacheReader reader = getRegistry().getCacheReader();
27                  if (reader != null)
28                      elements = new SoftReference  (reader.loadConfigurationElements(this, subElementsCacheOffset));
29              }
30              if (elements == null)
31                  elements = new IConfigurationElement[0];
32  
33              if (((SoftReference  ) elements).get() == null) {
34                  RegistryCacheReader reader = getRegistry().getCacheReader();
35                  if (reader != null)
36                      elements = new SoftReference  (reader.loadConfigurationElements(this, subElementsCacheOffset));
37              }
38          }
39          return (IConfigurationElement[]) ((SoftReference  ) elements).get();
40      }
41  
42      public void setSubElements(IConfigurationElement[] value) {
43          elements = new SoftReference  (value);
44      }
45  }
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