content: /*******************************************************************************
   * Copyright (c) 2000, 2007 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.wst.jsdt.internal.ui.compare;
  
  import org.eclipse.core.runtime.Assert;
  import org.eclipse.jface.action.Action;
  import org.eclipse.jface.action.IAction;
  import org.eclipse.jface.viewers.ISelection;
  import org.eclipse.ui.IActionDelegate;
  import org.eclipse.wst.jsdt.internal.ui.javaeditor.JavaEditor;
  
  /**
   * A delegate for JavaHistoryActionImpls.
   */
  public abstract class JavaHistoryAction extends Action implements IActionDelegate { 
  	
  	private JavaHistoryActionImpl fDelegate;	
  	private JavaEditor fEditor;
  	private String fTitle;
  	private String fMessage;
  	
  	JavaHistoryAction() {
  	}
  	
  	private JavaHistoryActionImpl getDelegate() {
  		if (fDelegate == null) {
  			fDelegate= createDelegate();
  			if (fEditor != null && fTitle != null && fMessage != null)
  				fDelegate.init(fEditor, fTitle, fMessage);
  		}
  		return fDelegate;
  	}
  	
  	protected abstract JavaHistoryActionImpl createDelegate();
  	
  	final void init(JavaEditor editor, String text, String title, String message) {
  		Assert.isNotNull(editor);
  		Assert.isNotNull(title);
  		Assert.isNotNull(message);
  		fEditor= editor;
  		fTitle= title;
  		fMessage= message;
  		//getDelegate().init(editor, text, title, message);
  		setText(text);
  		//setEnabled(getDelegate().checkEnabled());
  	}
  	
  	/**
  	 * Executes this action with the given selection.
  	 */
  	public final void run(ISelection selection) {
  		getDelegate().run(selection);
  	}
  
  	public final void run() {
  		getDelegate().runFromEditor(this);
  	}
  
  	final void update() {
  		getDelegate().update(this);
  	}
  	
   	//---- IActionDelegate
  	
  	public final void selectionChanged(IAction uiProxy, ISelection selection) {
  		getDelegate().selectionChanged(uiProxy, selection);
  	}
  	
  	public final void run(IAction action) {
  		getDelegate().run(action);
  	}
  }
  