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

import java.util.Collection;
import java.util.HashSet;

import org.eclipse.viatra2.core.IModelElement;
import org.eclipse.viatra2.core.IRelation;
import org.eclipse.viatra2.gtasm.patternmatcher.exceptions.PatternMatcherRuntimeException;
import org.eclipse.viatra2.gtasm.patternmatcher.impl.patternmatcher.internal.EdgeType;
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;


/**
 * ExtendConstantNodeOperation is an ExtendOperation where
 * the bound node is a constant node.
 */
public class ExtendConstantNodeOperation extends ExtendOperation {
    private IModelElement bound;
    
	/**
	 * @param bound The constant node to be extended.
	 * @param unbound The unbound pattern variable.
	 * @param edgeType The type of the edge.
	 * @param isSrc true, if the constant node is the source of the 
     * edge.
	 */
	public ExtendConstantNodeOperation(IModelElement bound, Integer unbound,
			SearchGraphEdge edge) {
        super(unbound,edge);
        this.bound = bound;
	}
	
    public void preprocess(MatchingFrame frame) 
        throws PatternMatcherRuntimeException {
        if (bound == null) {
        	String[] context = {edge.getSourceNode().getName(),getClass().getSimpleName()};
			throw new PatternMatcherRuntimeException(PatternMatcherErrorStrings.INTERNAL_EMPTY_VALUE
					,context
					,edge.getSourceNode().getTraceabilityElement().getRepresentativeEMFElement());
        }
        
            if (edge.getVPMEdgeType() == EdgeType.INSTANCEOF && !edge.isSource()) {
                iterator = bound.getAllTypes().iterator();
            } else if (edge.getVPMEdgeType() == EdgeType.INSTANCEOF && edge.isSource()) {
                iterator = bound.getAllInstances().iterator();
            } else if (edge.getVPMEdgeType() == EdgeType.SUPERTYPEOF && !edge.isSource()) {
                iterator = bound.getAllSubtypes().iterator();
            } else if (edge.getVPMEdgeType() == EdgeType.SUPERTYPEOF && edge.isSource()) {
                iterator = bound.getAllSupertypes().iterator();
            } else if (edge.getVPMEdgeType() == EdgeType.SOURCE && !edge.isSource()) {
                iterator = bound.getRelationsFrom().iterator();
            } else if (edge.getVPMEdgeType() == EdgeType.SOURCE && edge.isSource()) {
                Collection<IModelElement> coll = new HashSet<IModelElement>();
                if (bound instanceof IRelation) {
                    coll.add(((IRelation) bound).getFrom());
                }
                iterator = coll.iterator();
            } else if (edge.getVPMEdgeType() == EdgeType.TARGET && !edge.isSource()) {
                iterator = bound.getRelationsTo().iterator();
            } else if (edge.getVPMEdgeType() == EdgeType.TARGET && edge.isSource()) {
                Collection<IModelElement> coll = new HashSet<IModelElement>();
                if (bound instanceof IRelation) {
                    coll.add(((IRelation) bound).getTo());
                }
                iterator = coll.iterator();
            } else if (edge.getVPMEdgeType() == EdgeType.IN && edge.isSource()) {
                iterator = bound.getElementsInNamespace().iterator();
            } else if (edge.getVPMEdgeType() == EdgeType.BELOW && edge.isSource()) {
                iterator = bound.getAllElementsInNamespace().iterator();
            } else if (edge.getVPMEdgeType() == EdgeType.IN && !edge.isSource()) {
            	Collection<IModelElement> coll = new HashSet<IModelElement>();
            	if(bound.getNamespace() != null)
            		coll.add(bound.getNamespace());
            	
            	iterator = coll.iterator();
            } else if (edge.getVPMEdgeType() == EdgeType.BELOW && !edge.isSource()) {
            	String[] context = {frame.getPattern().getSearchGraph().getSearchNode(unbound).getName(),edge.getVPMEdgeType().toString()};
            	throw new PatternMatcherRuntimeException(PatternMatcherErrorStrings.INTERNAL_OPERATION_NOT_POSSIBLE
            			,context
            			,edge.getTraceabilityElement().getRepresentativeEMFElement());
           
            } else if (edge.getVPMEdgeType() == EdgeType.NACCHECK) {
            	String[] context = {frame.getPattern().getSearchGraph().getSearchNode(unbound).getName(),edge.getVPMEdgeType().toString()};
            	throw new PatternMatcherRuntimeException(PatternMatcherErrorStrings.INTERNAL_OPERATION_NOT_POSSIBLE
            			,context
            			,edge.getTraceabilityElement().getRepresentativeEMFElement());
            }
    }

    public String toString() {
        return getClass().getSimpleName() + " : " + 
            bound.getName() + " -- " + edge.getVPMEdgeType().name() + " -> " + unbound;
	}
}