org.eclipse.viatra2.gtasm.patternmatcher.impl/src/org/eclipse/viatra2/gtasm/patternmatcher/impl/gtmatcher/internal/operation/SetRelationTarget.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.operation;

import org.eclipse.viatra2.core.IModelElement;
import org.eclipse.viatra2.core.IModelManager;
import org.eclipse.viatra2.core.IRelation;
import org.eclipse.viatra2.errors.VPMCoreException;
import org.eclipse.viatra2.gtasm.patternmatcher.impl.gtmatcher.exceptions.GTErrorStrings;
import org.eclipse.viatra2.gtasm.patternmatcher.impl.gtmatcher.exceptions.GTOperationException;
import org.eclipse.viatra2.gtasm.patternmatcher.impl.patternmatcher.internal.MatchingFrame;
import org.eclipse.viatra2.gtasm.patternmatcher.impl.patternmatcher.internal.searchgraph.SearchGraphEdge;
import org.eclipse.viatra2.gtasmmodel.gtasm.metamodel.asm.core.AnnotatedElement;


/**
 * @author Akos Horvath
 *
 */
public class SetRelationTarget extends SetRelation{

	/**
	 * 
	 */
	SearchGraphEdge relatedSearchGraphEdge;
	int target;
	
	public SetRelationTarget(int rel, int target
			,IModelManager manager, SearchGraphEdge edge) {
		super(manager,rel);
		this.target = target;
		relatedSearchGraphEdge = edge;
	}
	
	public boolean update(MatchingFrame frame)throws GTOperationException {
		IModelElement targetElement = null;
        IRelation relationElement = null;
		try {
            targetElement = (IModelElement) frame.getValue(target);
        } catch (ClassCastException e) {
        	String[] context = {relatedSearchGraphEdge.getSourceNode().getName(), getClass().getSimpleName()};
			throw new GTOperationException(GTErrorStrings.NOT_A_MODELELEMENT
					,context
					,relatedSearchGraphEdge.getSourceNode().getTraceabilityElement().getRepresentativeEMFElement());
        }
        try {
            relationElement = (IRelation) frame.getValue(relation);
        } catch (ClassCastException e) {
        	String[] context = {relatedSearchGraphEdge.getTargetNode().getName(), getClass().getSimpleName()};
			throw new GTOperationException(GTErrorStrings.NOT_A_RELATION
					,context
					,relatedSearchGraphEdge.getTargetNode().getTraceabilityElement().getRepresentativeEMFElement());
   	  }
        if (targetElement == null) {
        	String[] context = {relatedSearchGraphEdge.getTargetNode().getName(),getClass().getSimpleName()};
			throw new GTOperationException(GTErrorStrings.INTERNAL_EMPTY_VALUE
					,context
					,relatedSearchGraphEdge.getTargetNode().getTraceabilityElement().getRepresentativeEMFElement());
     }
		
		try {
			if(!relationElement.getTo().equals(targetElement))
				manager.setRelationTo(relationElement,targetElement);
			return true;
		}catch (VPMCoreException e) {
			String[] context = {relatedSearchGraphEdge.getTargetNode().getName(), relatedSearchGraphEdge.getTargetNode().getName(), e.getMessage()};
			throw new GTOperationException(GTErrorStrings.INTERNAL_SET_RELATION_TARGET
					,context
					,relatedSearchGraphEdge.getTraceabilityElement().getRepresentativeEMFElement());
		}	
	}
	
	@Override
	public String toString() {
		return "Relation: "+relation + "-- set Target --> " + target; 
	}
	
	@Override
	public AnnotatedElement getErrorfulElement(MatchingFrame frame){
    	return relatedSearchGraphEdge.getTraceabilityElement().getRepresentativeEMFElement();
    }

}