/*******************************************************************************
 * 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.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.ConstantSearchGraphNode;
import org.eclipse.viatra2.gtasm.patternmatcher.impl.patternmatcher.internal.searchgraph.SearchGraphEdge;
import org.eclipse.viatra2.gtasm.patternmatcher.impl.patternmatcher.internal.searchgraph.SearchGraphNode;
import org.eclipse.viatra2.gtasm.patternmatcher.impl.patternmatcher.internal.searchgraph.VariableSearchGraphNode;
import org.eclipse.viatra2.gtasmmodel.gtasm.metamodel.asm.core.AnnotatedElement;


/**
 * @author Akos Horvath
 *
 */
//In normal cases this type of relation creating operation would not be nstanciated
public class CreateRelationConstant2Constant extends CreateConstant2Constant {
	
	ConstantSearchGraphNode sourceNode, targetNode;
	
	public CreateRelationConstant2Constant(ConstantSearchGraphNode s,
			ConstantSearchGraphNode t,  int variableI,IModelManager manager){
		super(manager,variableI);
		sourceNode = s;
		targetNode = t;
		
		source = manager.getElementByName(((ConstantSearchGraphNode)s).getElement());
		target= manager.getElementByName(((ConstantSearchGraphNode)t).getElement());
	}
	
	@Override
	protected boolean create(MatchingFrame frame)throws GTOperationException {
		 if (source == null) {
	        	String[] context = {sourceNode.getName(),getClass().getSimpleName()};
				throw new GTOperationException(GTErrorStrings.INTERNAL_EMPTY_VALUE
						,context
						,sourceNode.getTraceabilityElement().getRepresentativeEMFElement());
	     
	        }
	        if (target == null) {
	        	String[] context = {targetNode.getName(),getClass().getSimpleName()};
				throw new GTOperationException(GTErrorStrings.INTERNAL_EMPTY_VALUE
						,context
						,targetNode.getTraceabilityElement().getRepresentativeEMFElement());
	        }
		
		try {
			frame.setValue(variableIndex, manager.newRelation(source,target));
		} catch (VPMCoreException e) {
			String[] context = {frame.getPattern().getSearchGraph().getSearchNode(variableIndex).getName(),e.getMessage()};
			throw new GTOperationException(GTErrorStrings.INTERNAL_CREATE_RELATION
					,context
					,frame.getPattern().getSearchGraph().getSearchNode(variableIndex).getTraceabilityElement().getRepresentativeEMFElement());
		}
		return true;
	} 
	
	public String toString() {
		return getClass().getSimpleName() + " : " + 
            source.getName() + " -- Relation:"+ variableIndex+" -> " + target.getName();
	}
	
    @Override
	public AnnotatedElement getErrorfulElement(MatchingFrame frame){
    	return frame.getPattern().getSearchGraph().getSearchNode(variableIndex).getTraceabilityElement().getRepresentativeEMFElement();
    }
    

}