AbstractMemoryRenderingBindingsProvider.java :  » IDE-Eclipse » debug » org » eclipse » debug » ui » memory » Java Open Source

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/*******************************************************************************
 * Copyright (c) 2004, 2006 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.debug.ui.memory;

import org.eclipse.core.runtime.ISafeRunnable;
import org.eclipse.core.runtime.ListenerList;
import org.eclipse.core.runtime.SafeRunner;
import org.eclipse.debug.internal.ui.DebugUIPlugin;

/**
 * Common function for a dynamic memory rendering bindings provider.
 * <p>
 * Clients may subclass this class.
 * </p>
 * @see org.eclipse.debug.ui.memory.IMemoryRenderingBindingsProvider
 * @since 3.1
 */
public abstract class AbstractMemoryRenderingBindingsProvider implements IMemoryRenderingBindingsProvider {
      
  // list of binding listeners
  private ListenerList fListeners;
        
  /* (non-Javadoc)
   * @see org.eclipse.debug.ui.memory.IMemoryRenderingBindingsProvider#addListener(org.eclipse.debug.ui.memory.IMemoryRenderingBindingsListener)
   */
  public void addListener(IMemoryRenderingBindingsListener listener) {
    if (fListeners == null) {
      fListeners = new ListenerList();
    }
    fListeners.add(listener);
  }
  /* (non-Javadoc)
   * @see org.eclipse.debug.ui.memory.IMemoryRenderingBindingsProvider#removeListener(org.eclipse.debug.ui.memory.IMemoryRenderingBindingsListener)
   */
  public void removeListener(IMemoryRenderingBindingsListener listener) {
    if (fListeners != null) {
      fListeners.remove(listener);
    }
  }
  
  /**
   * Notifies all registered listeners that bindings have changed.
   */
  protected void fireBindingsChanged() {
    if (fListeners == null) {
      return;
    }
    
    Object[] listeners = fListeners.getListeners();
    
    for (int i=0; i<listeners.length; i++) {
      if (listeners[i] instanceof IMemoryRenderingBindingsListener) {
        final IMemoryRenderingBindingsListener listener = (IMemoryRenderingBindingsListener)listeners[i];
        ISafeRunnable runnable = new ISafeRunnable () {
          public void handleException(Throwable exception) {
            DebugUIPlugin.log(exception);
          }
          public void run() throws Exception {
            listener.memoryRenderingBindingsChanged();
          }};
        SafeRunner.run(runnable);
      }
    }
  }
}
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