content: /*******************************************************************************
   * Copyright (c) 2000, 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;
  
  import org.eclipse.core.runtime.CoreException;
  import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.IJavaScriptProject;
  import org.eclipse.wst.jsdt.core.JavaScriptCore;
  import org.eclipse.wst.jsdt.core.ToolFactory;
  import org.eclipse.wst.jsdt.core.compiler.IScanner;
  import org.eclipse.wst.jsdt.core.search.SearchMatch;
  import org.eclipse.wst.jsdt.internal.corext.util.SearchUtils;
  
  /**
   * Collects the results returned by a <code>SearchEngine</code>.
   * Only collects matches in CUs ands offers a scanner to trim match ranges.
   */
  public abstract class CuCollectingSearchRequestor extends CollectingSearchRequestor {
  
  	private IJavaScriptUnit fCuCache;
  	private IScanner fScannerCache;
  	
  	protected IScanner getScanner(IJavaScriptUnit unit) {
  		if (unit.equals(fCuCache))
  			return fScannerCache;
  		
  		fCuCache= unit;
  		IJavaScriptProject project= unit.getJavaScriptProject();
  		String sourceLevel= project.getOption(JavaScriptCore.COMPILER_SOURCE, true);
  		String complianceLevel= project.getOption(JavaScriptCore.COMPILER_COMPLIANCE, true);
  		fScannerCache= ToolFactory.createScanner(false, false, false, sourceLevel, complianceLevel);
  		return fScannerCache;
  	}
  	
  	/**
  	 * This is an internal method. Do not call from subclasses!
  	 * Use {@link #collectMatch(SearchMatch)} instead.
  	 * @param match 
  	 * @throws CoreException 
  	 * @deprecated
  	 */
  	public final void acceptSearchMatch(SearchMatch match) throws CoreException {
  		IJavaScriptUnit unit= SearchUtils.getCompilationUnit(match);
  		if (unit == null)
  			return;
  		acceptSearchMatch(unit, match);
  	}
  	
  	public void collectMatch(SearchMatch match) throws CoreException {
  		super.acceptSearchMatch(match);
  	}
  	
  	protected abstract void acceptSearchMatch(IJavaScriptUnit unit, SearchMatch match) throws CoreException;
  
  	public void endReporting() {
  		fCuCache= null;
  		fScannerCache= null;
  	}
  }
  
  
  