org.eclipse.viatra2.gtasm.patternmatcher.impl/src/org/eclipse/viatra2/gtasm/patternmatcher/impl/gtmatcher/internal/ExtendedGTRuleMatcherwithAlternativePatternMatcher.java

/*******************************************************************************
 * Copyright (c) 2004-2008 Akos Horvath, Gergely Varro and Daniel Varro
 * 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:
 *    Akos Horvath, Gergely Varro - initial API and implementation
 *******************************************************************************/

package org.eclipse.viatra2.gtasm.patternmatcher.impl.gtmatcher.internal;

import org.eclipse.viatra2.gtasm.interpreter.exception.ViatraTransformationException;
import org.eclipse.viatra2.gtasm.interpreter.executionEnvironment.IExecutionEnvironment;
import org.eclipse.viatra2.gtasm.patternmatcher.PatternMatcherParameters;
import org.eclipse.viatra2.gtasm.patternmatcher.impl.gtmatcher.exceptions.GTErrorStrings;
import org.eclipse.viatra2.gtasm.patternmatcher.impl.gtmatcher.exceptions.GraphTransformationException;
import org.eclipse.viatra2.gtasm.patternmatcher.impl.gtmatcher.extension.AlternativePatternMactherProvider;
import org.eclipse.viatra2.gtasm.patternmatcher.impl.patternmatcher.term.ITermHandler;
import org.eclipse.viatra2.gtasm.patternmatcher.patterns.IPatternMatcher;
import org.eclipse.viatra2.gtasmmodel.gtasm.metamodel.asm.core.RuntimeAnnotation;
import org.eclipse.viatra2.gtasmmodel.gtasm.metamodel.gt.GTRule;


/**
 * Provides a complete GT rule matcher functionality with the possibility to use alternative pattern matchers for the LHS of the GT rule
 * @author Akos Horvath
 *
 */
public class ExtendedGTRuleMatcherwithAlternativePatternMatcher extends TraditionalGTRuleMatcher {

	public ExtendedGTRuleMatcherwithAlternativePatternMatcher(GTRule gt,
			IExecutionEnvironment enviroment, ITermHandler handler,
			PatternMatcherParameters mp) throws ViatraTransformationException {
		super(gt, enviroment, handler, mp);
	}

	/* The only method that has to be overridden in order to enable the Alternative Pattern Matchers in case when we want to use
	 * the already implemented Traditional GT Rule matcher
	 * (non-Javadoc)
	 * @see org.eclipse.viatra2.gtasm.patternmatcher.impl.gtmatcher.internal.TraditionalGTRuleMatcher#getPatternMatcherforPreCondition()
	 */
	@Override
	protected IPatternMatcher getPatternMatcherforPreCondition() throws ViatraTransformationException{
		// is true pseudorandom required?
		isRandom = false;
		for (Object annot : gtRule.getPrecondition().getCalledPattern().getRuntimeAnnotations()) {
			if ("@random".equals(((RuntimeAnnotation) annot).getAnnotationName().toLowerCase())) {
				isRandom = true; break;
			}
		}	
		
		if(AlternativePatternMactherProvider.getInstance().hasAlternatePatternMatcher()) {
			return AlternativePatternMactherProvider.getInstance().getPatternMatcher(gtEnvironment, gtRule);
		} else {
			String[] context = {gtRule.getName()};
			throw new GraphTransformationException(GTErrorStrings.NO_ALTERNATIVE_PATTERN_MATCHER
					,context
					,gtRule);
		}
	}
}