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.corext.dom;
  
  import org.eclipse.core.runtime.Assert;
  import org.eclipse.text.edits.TextEditGroup;
  import org.eclipse.wst.jsdt.core.dom.ASTNode;
  import org.eclipse.wst.jsdt.core.dom.ChildListPropertyDescriptor;
  import org.eclipse.wst.jsdt.core.dom.StructuralPropertyDescriptor;
  import org.eclipse.wst.jsdt.core.dom.rewrite.ASTRewrite;
  import org.eclipse.wst.jsdt.core.dom.rewrite.ListRewrite;
  
  
  /**
  *
  * Provisional API: This class/interface is part of an interim API that is still under development and expected to
  * change significantly before reaching stability. It is being made available at this early stage to solicit feedback
  * from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken
  * (repeatedly) as the API evolves.
  */
  public class ReplaceRewrite {
  	
  	protected ASTRewrite fRewrite;
  	protected ASTNode[] fToReplace;
  	protected StructuralPropertyDescriptor fDescriptor;
  	
  	public static ReplaceRewrite create(ASTRewrite rewrite, ASTNode[] nodes) {
  		return new ReplaceRewrite(rewrite, nodes);
  	}
  	
  	protected ReplaceRewrite(ASTRewrite rewrite, ASTNode[] nodes) {
  		Assert.isNotNull(rewrite);
  		Assert.isNotNull(nodes);
  		Assert.isTrue(nodes.length > 0);
  		fRewrite= rewrite;
  		fToReplace= nodes;
  		fDescriptor= fToReplace[0].getLocationInParent();
  		if (nodes.length > 1) {
  			Assert.isTrue(fDescriptor instanceof ChildListPropertyDescriptor);
  		}
  	}
  	
  	public void replace(ASTNode[] replacements, TextEditGroup description) {
  		if (fToReplace.length == 1) {
  			if (replacements.length == 1) {
  				handleOneOne(replacements, description);
  			} else {
  				handleOneMany(replacements, description);
  			}
  		} else {
  			handleManyMany(replacements, description);
  		}
  	}
  
  	protected void handleOneOne(ASTNode[] replacements, TextEditGroup description) {
  		fRewrite.replace(fToReplace[0], replacements[0], description);
  	}
  
  	protected void handleOneMany(ASTNode[] replacements, TextEditGroup description) {
  		handleManyMany(replacements, description);
  	}
  	
  	protected void handleManyMany(ASTNode[] replacements, TextEditGroup description) {
  		ListRewrite container= fRewrite.getListRewrite(fToReplace[0].getParent(), (ChildListPropertyDescriptor)fDescriptor);
  		if (fToReplace.length == replacements.length) {
  			for (int i= 0; i < fToReplace.length; i++) {
  				container.replace(fToReplace[i], replacements[i], description);
  			}
  		} else if (fToReplace.length < replacements.length) {
  			for (int i= 0; i < fToReplace.length; i++) {
  				container.replace(fToReplace[i], replacements[i], description);
  			}
  			for (int i= fToReplace.length; i < replacements.length; i++) {
  				container.insertAfter(replacements[i], replacements[i - 1], description);
  			}
  		} else if (fToReplace.length > replacements.length) {
  			int delta= fToReplace.length - replacements.length;
  			for(int i= 0; i < delta; i++) {
  				container.remove(fToReplace[i], description);
  			}
  			for (int i= delta, r= 0; i < fToReplace.length; i++, r++) {
  				container.replace(fToReplace[i], replacements[r], description);
  			}
  		}
  	}
  }
  