ch.bfh.unicrypt.helper.converter.classes.biginteger.BooleanToBigInteger Maven / Gradle / Ivy

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/*
 * UniCrypt
 *
 *  UniCrypt(tm): Cryptographical framework allowing the implementation of cryptographic protocols e.g. e-voting
 *  Copyright (c) 2016 Bern University of Applied Sciences (BFH), Research Institute for
 *  Security in the Information Society (RISIS), E-Voting Group (EVG)
 *  Quellgasse 21, CH-2501 Biel, Switzerland
 *
 *  Licensed under Dual License consisting of:
 *  1. GNU Affero General Public License (AGPL) v3
 *  and
 *  2. Commercial license
 *
 *
 *  1. This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Affero General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   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 Affero General Public License for more details.
 *
 *   You should have received a copy of the GNU Affero General Public License
 *   along with this program.  If not, see .
 *
 *
 *  2. Licensees holding valid commercial licenses for UniCrypt may use this file in
 *   accordance with the commercial license agreement provided with the
 *   Software or, alternatively, in accordance with the terms contained in
 *   a written agreement between you and Bern University of Applied Sciences (BFH), Research Institute for
 *   Security in the Information Society (RISIS), E-Voting Group (EVG)
 *   Quellgasse 21, CH-2501 Biel, Switzerland.
 *
 *
 *   For further information contact 
 *
 *
 * Redistributions of files must retain the above copyright notice.
 */
package ch.bfh.unicrypt.helper.converter.classes.biginteger;

import ch.bfh.unicrypt.helper.converter.abstracts.AbstractBigIntegerConverter;
import ch.bfh.unicrypt.helper.math.MathUtil;
import java.math.BigInteger;

/**
 * The single instance of this class converts the Boolean values {@code false} into {@link BigInteger#ZERO} and
 * {@code true} into {@link BigInteger#ONE}.
 * 
 * @author R. Haenni
 * @version 2.0
 */
public class BooleanToBigInteger
	   extends AbstractBigIntegerConverter {

	private static BooleanToBigInteger instance = null;

	private BooleanToBigInteger() {
		super(Boolean.class);
	}

	/**
	 * Returns the single instance of this class.
	 * 
	 * @return The single instance
	 */
	public static BooleanToBigInteger getInstance() {
		if (instance == null) {
			instance = new BooleanToBigInteger();
		}
		return instance;
	}

	@Override
	protected boolean defaultIsValidOutput(BigInteger value) {
		return value.equals(MathUtil.ZERO) || value.equals(MathUtil.ONE);
	}

	@Override
	protected BigInteger abstractConvert(Boolean value) {
		if (value) {
			return MathUtil.ONE;
		}
		return MathUtil.ZERO;
	}

	@Override
	protected Boolean abstractReconvert(BigInteger value) {
		if (value.equals(MathUtil.ZERO)) {
			return false;
		}
		return true;
	}

}