/*******************************************************************************
 * 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.patternmatcher.internal.operation;

import java.util.Set;

import org.eclipse.viatra2.core.IModelElement;
import org.eclipse.viatra2.gtasm.patternmatcher.exceptions.PatternMatcherRuntimeException;
import org.eclipse.viatra2.gtasm.patternmatcher.impl.patternmatcher.internal.MatchingFrame;
import org.eclipse.viatra2.gtasm.patternmatcher.impl.patternmatcher.internal.PatternMatcherErrorStrings;
import org.eclipse.viatra2.gtasm.patternmatcher.impl.patternmatcher.internal.searchgraph.SearchGraphEdge;
import org.eclipse.viatra2.gtasmmodel.gtasm.metamodel.asm.core.AnnotatedElement;

public class CopyValueOperation extends CheckOperation {
    private Integer bound;
    private Integer unbound;
    private SearchGraphEdge relatedSearchGraphEdge;
    
	public CopyValueOperation(Integer bound, Integer unbound, SearchGraphEdge edge) {
	    this.bound = bound;
	    this.unbound = unbound;
	    relatedSearchGraphEdge = edge;
	}
	
	@Override
	protected boolean check(MatchingFrame frame) throws PatternMatcherRuntimeException {
        IModelElement boundElement = null;
        try {
            boundElement = (IModelElement) frame.getValue(bound);
        } catch (ClassCastException e) {
        	String[] context = {frame.getPattern().getSearchGraph().getSearchNode(bound).getName(), getClass().getSimpleName()};
            throw new PatternMatcherRuntimeException(PatternMatcherErrorStrings.NOT_A_MODELELEMENT
            		,context
            		,frame.getPattern().getSearchGraph().getSearchNode(bound).getTraceabilityElement().getRepresentativeEMFElement());
        }
        if (boundElement == null) {
        	String[] context = {frame.getPattern().getSearchGraph().getSearchNode(bound).getName(),getClass().getSimpleName()};
			throw new PatternMatcherRuntimeException(PatternMatcherErrorStrings.INTERNAL_EMPTY_VALUE
					,context
					,frame.getPattern().getSearchGraph().getSearchNode(bound).getTraceabilityElement().getRepresentativeEMFElement());
        }
        frame.setValue(unbound, boundElement);
		return true;
	}
    
    public String toString() {
        return getClass().getSimpleName() + " : " + bound + " -> " + unbound;
	}
    
    public void calculateSidewaysPassedVariables(Set<Integer> variableSet) {
    	variableSet.add(bound);
    	variableSet.remove(unbound);
    }
    
    public void calculateLocalVariables(Set<Integer> variableSet) {
    	variableSet.add(bound);
    }

	public AnnotatedElement getErrorfulElement(MatchingFrame frame) {
		return frame.getPattern().getGTASMRepresentation(relatedSearchGraphEdge);
	}
}