content: /*******************************************************************************
   * Copyright (c) 2007, 2008 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.refactoring.rename;
  
  import org.eclipse.core.runtime.CoreException;
  import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.IType;
  import org.eclipse.wst.jsdt.core.compiler.IScanner;
  import org.eclipse.wst.jsdt.core.compiler.ITerminalSymbols;
  import org.eclipse.wst.jsdt.core.compiler.InvalidInputException;
  import org.eclipse.wst.jsdt.core.search.SearchMatch;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.CuCollectingSearchRequestor;
  
  public class TypeOccurrenceCollector extends CuCollectingSearchRequestor {
  	
  	final String fOldName;
  	final String fOldQualifiedName;
  	
  	public TypeOccurrenceCollector(IType type) {
  		fOldName= type.getElementName();
  		fOldQualifiedName= type.getFullyQualifiedName('.');
  	}
  
  	public void acceptSearchMatch(IJavaScriptUnit unit, SearchMatch match) throws CoreException {
  		collectMatch(acceptSearchMatch2(unit, match));
  	}
  	
  	public SearchMatch acceptSearchMatch2(IJavaScriptUnit unit, SearchMatch match) throws CoreException {
  		int start= match.getOffset();
  		int length= match.getLength();
  		
  		//unqualified:
  		String matchText= unit.getBuffer().getText(start, length);
  		if (fOldName.equals(matchText)) {
  			return match;
  		}
  		
  		//(partially) qualified:
  		if (fOldQualifiedName.endsWith(matchText)) {
  			//e.g. rename B and p.A.B ends with match A.B
  			int simpleNameLenght= fOldName.length();
  			match.setOffset(start + length - simpleNameLenght);
  			match.setLength(simpleNameLenght);
  			return match;
  		}
  		
  		//Not a standard reference -- use scanner to find last identifier token:
  		IScanner scanner= getScanner(unit);
  		scanner.setSource(matchText.toCharArray());
  		int simpleNameStart= -1;
  		int simpleNameEnd= -1;
  		try {
  			int token = scanner.getNextToken();
  			while (token != ITerminalSymbols.TokenNameEOF) {
  				if (token == ITerminalSymbols.TokenNameIdentifier) {
  					simpleNameStart= scanner.getCurrentTokenStartPosition();
  					simpleNameEnd= scanner.getCurrentTokenEndPosition();
  				}
  				token = scanner.getNextToken();
  			}
  		} catch (InvalidInputException e){
  			//ignore
  		}	
  		if (simpleNameStart != -1) {
  			match.setOffset(start + simpleNameStart);
  			match.setLength(simpleNameEnd + 1 - simpleNameStart);
  		}
  		return match;
  	}
  }
  