org.eclipse.viatra2.gtasm.patternmatcher.incremental.rete/src/org/eclipse/viatra2/gtasm/patternmatcher/incremental/rete/construction/quasitree/JoinCandidate.java

/*******************************************************************************
 * Copyright (c) 2004-2010 Gabor Bergmann 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:
 *    Gabor Bergmann - initial API and implementation
 *******************************************************************************/

package org.eclipse.viatra2.gtasm.patternmatcher.incremental.rete.construction.quasitree;

import java.util.Collections;
import java.util.Set;

import org.eclipse.viatra2.gtasm.patternmatcher.incremental.rete.construction.Stub;

/**
 * @author Bergmann Gábor
 *
 */
class JoinCandidate<StubHandle> {
	Stub<StubHandle> primary;
	Stub<StubHandle> secondary;
	
	Set<Object> varPrimary;
	Set<Object> varSecondary;


	JoinCandidate(Stub<StubHandle> primary, Stub<StubHandle> secondary) {
		super();
		this.primary = primary;
		this.secondary = secondary;
		
		varPrimary = getPrimary().getVariablesSet();
		varSecondary = getSecondary().getVariablesSet();

	}
	/**
	 * @return the a
	 */
	public Stub<StubHandle> getPrimary() {
		return primary;
	}
	/**
	 * @return the b
	 */
	public Stub<StubHandle> getSecondary() {
		return secondary;
	}
	
	
	
	/* (non-Javadoc)
	 * @see java.lang.Object#toString()
	 */
	@Override
	public String toString() {
		return primary.toString() + " |x| " + secondary.toString();
	}
	/**
	 * @return the varPrimary
	 */
	public Set<Object> getVarPrimary() {
		return varPrimary;
	}
	/**
	 * @return the varSecondary
	 */
	public Set<Object> getVarSecondary() {
		return varSecondary;
	}

	public boolean isTrivial() {
		return getPrimary().equals(getSecondary()); 
	}
	public boolean isCheckOnly() {
		return varPrimary.containsAll(varSecondary) || varSecondary.containsAll(varPrimary); 
	}
	public boolean isDescartes() {
		return Collections.disjoint(varPrimary, varSecondary); 
	}

}