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/*
 * Copyright (c) 2013 John May 
 *
 * Contact: [email protected]
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
 * All we ask is that proper credit is given for our work, which includes
 * - but is not limited to - adding the above copyright notice to the beginning
 * of your source code files, and to any copyright notice that you may distribute
 * with programs based on this work.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 U
 */

package org.openscience.cdk.hash.stereo;


/**
 * Combine two permutation parities into one.
 *
 * @author John May
 * @cdk.module hash
 * @cdk.githash
 */
final class CombinedPermutationParity extends PermutationParity {

    private final PermutationParity left;
    private final PermutationParity right;

    /**
     * Combines the left and right parity into a single parity. This parity is
     * the product of the two separate parities.
     *
     * @param left  either parity
     * @param right other parity
     */
    public CombinedPermutationParity(PermutationParity left, PermutationParity right) {
        this.left = left;
        this.right = right;
    }

    /**
     * @inheritDoc
     */
    @Override
    public int parity(long[] current) {
        return left.parity(current) * right.parity(current);
    }
}