code: /**
   * <copyright>
   * Copyright (c) 2010-2014 Henshin developers. 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
   * </copyright>
   */
  package org.eclipse.emf.henshin.interpreter.matching.jit;
  
  import java.util.Map;
  
  import org.eclipse.emf.henshin.model.Rule;
  
  /**
   * JIT matcher compiler class. Use the INSTANCE field to generate 
   * match finders using the default JIT matcher compilers.
   * 
   * @author Christian Krause
   */
  public interface JITMatcherCompiler {
  	
  	/**
  	 * Static instance. Use this to generate match finders.
  	 */
  	public static JITMatcherCompiler INSTANCE = new JITMatcherCompiler() {
  		
  		/*
  		 * JITCompilers to be used:
  		 */
  		private final JITMatcherCompiler[] COMPILERS = new JITMatcherCompiler[] {
  				new TreeJITMatcherCompiler()
  		};
  		
  		@Override
  		public JITMatcher generateMatcher(Rule rule, Map<String,Object> options) {
  			for (JITMatcherCompiler compiler : COMPILERS) {
  				JITMatcher matchFinder = compiler.generateMatcher(rule, options);
  				if (matchFinder!=null) {
  					return matchFinder;
  				}
  			}
  			return null; // no match finder generated
  		}
  
  	};
  	
  	/**
  	 * Generate a JIT matcher.
  	 * @param rule Rule to be matched.
  	 * @param options Engine options.
  	 * @return The JIT matcher or <code>null</code>.
  	 */
  	JITMatcher generateMatcher(Rule rule, Map<String,Object> options);
  	
  }
  