ConstantValue.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.incquery.runtime.rete.construction.psystem.basicenumerables;

import org.eclipse.incquery.runtime.rete.construction.RetePatternBuildException;
import org.eclipse.incquery.runtime.rete.construction.Stub;
import org.eclipse.incquery.runtime.rete.construction.psystem.KeyedEnumerablePConstraint;
import org.eclipse.incquery.runtime.rete.construction.psystem.PSystem;
import org.eclipse.incquery.runtime.rete.construction.psystem.PVariable;
import org.eclipse.incquery.runtime.rete.tuple.FlatTuple;

/**
 * @author Bergmann Gábor
 * 
 */
public class ConstantValue<PatternDescription, StubHandle> extends
        KeyedEnumerablePConstraint<Object, PatternDescription, StubHandle> {

    /**
     * @param buildable
     * @param variablesTuple
     * @param supplierKey
     */
    public ConstantValue(PSystem<PatternDescription, StubHandle, ?> pSystem, PVariable variable, Object value) {
        super(pSystem, new FlatTuple(variable), value);
    }

    @Override
    public Stub<StubHandle> doCreateStub() throws RetePatternBuildException {
        return buildable.buildStartStub(new Object[] { supplierKey }, this.variablesTuple.getElements());
    }

    @Override
    protected String keyToString() {
        return supplierKey.toString();
    }

}