MaskedTuple.java

/*******************************************************************************
 * Copyright (c) 2004-2009 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.tuple;

/**
 * A tuple that transparently provides a masked (transformed) view of another tuple.
 * 
 * @author Bergmann Gábor
 * 
 */
public class MaskedTuple extends Tuple {

    Tuple wrapped;
    TupleMask mask;

    public MaskedTuple(Tuple wrapped, TupleMask mask) {
        super();
        // if (wrapped instanceof MaskedTuple) {
        // MaskedTuple parent = (MaskedTuple)wrapped;
        // this.wrapped = parent.wrapped;
        // this.mask = mask.transform(parent.mask);
        // }
        // else
        {
            this.wrapped = wrapped;
            this.mask = mask;
        }
    }

    @Override
    public Object get(int index) {
        return wrapped.get(mask.indices[index]);
    }

    @Override
    public int getSize() {
        return mask.indices.length;
    }

}