org.eclipse.viatra2.gtasm.patternmatcher.impl/src/org/eclipse/viatra2/gtasm/patternmatcher/impl/gtmatcher/core/ExtendedGTRuleMatcherwithAlternativePatternMatcherFactory.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.core;

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.extension.IGTRuleMatcherFactory;
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.internal.ExtendedGTRuleMatcherwithAlternativePatternMatcher;
import org.eclipse.viatra2.gtasm.patternmatcher.impl.patternmatcher.term.BasicTermHandler;
import org.eclipse.viatra2.gtasm.patternmatcher.impl.patternmatcher.term.TermHandler;
import org.eclipse.viatra2.gtasm.patternmatcher.patterns.IGTRuleMatcher;
import org.eclipse.viatra2.gtasmmodel.gtasm.metamodel.gt.GTRule;


/**
 *
 * Implements the IGTRuleMatcherFactory extension point for the viatra GTASM interpreter with Incremental pattern matching
 * @author Akos Horvath
 */

public class ExtendedGTRuleMatcherwithAlternativePatternMatcherFactory implements IGTRuleMatcherFactory {
	
	private IGTRuleMatcher construct(GTRule gtRule, IExecutionEnvironment enviroment, PatternMatcherParameters pmParams) 
    		throws ViatraTransformationException {
		if (gtRule.getPrecondition() != null) {
			// traditional type gtRule with alternative pattern matching
			TermHandler handler = new BasicTermHandler(enviroment);
			return new ExtendedGTRuleMatcherwithAlternativePatternMatcher(gtRule,enviroment, handler, pmParams);
		} else {
			enviroment.getFramework().getLogger().warning("ActionPattern type GTRule not yet supported");
		}
		return null;
	}

	public IGTRuleMatcher getGTMatcher(IExecutionEnvironment gtEnviroment,
			GTRule gtRule, PatternMatcherParameters mp)
			throws ViatraTransformationException {
		IGTRuleMatcher gtMatcher=null;
		if (GTRuleMatchers.getInstance().containsKey(gtRule)) {
			// We already had it precompiled
			gtMatcher=GTRuleMatchers.getInstance().get(gtRule);
			gtMatcher.initGTRule(gtEnviroment);
		} else {
			// We need to createa new gtmatcher
			gtMatcher = construct(gtRule, gtEnviroment,mp);
			if (gtMatcher != null) {
				GTRuleMatchers.getInstance().put(gtRule, gtMatcher);
			} else {
				String[] context = {gtRule.getName()};
				throw new GraphTransformationException(GTErrorStrings.GTRULETYPE_NOTSUPPORTED
						,context
						,gtRule);
			}
		}
		return gtMatcher;
	}
}