com.liferay.portal.kernel.util.KeyValuePairComparator.java Source code

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Here is the source code for com.liferay.portal.kernel.util.KeyValuePairComparator.java

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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library 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.
 *
 * This library 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.
 */

package com.liferay.portal.kernel.util;

import java.util.Comparator;

/**
 * @author Brian Wing Shun Chan
 */
public class KeyValuePairComparator implements Comparator<KeyValuePair> {

    public KeyValuePairComparator() {
        this(true);
    }

    public KeyValuePairComparator(boolean ascending) {
        this(true, ascending);
    }

    public KeyValuePairComparator(boolean byKey, boolean ascending) {
        _byKey = byKey;
        _ascending = ascending;
    }

    @Override
    public int compare(KeyValuePair kvp1, KeyValuePair kvp2) {
        if (_byKey) {
            String key1 = kvp1.getKey();
            String key2 = kvp2.getKey();

            if (_ascending) {
                return key1.compareTo(key2);
            }

            return -key1.compareTo(key2);
        }

        String value1 = kvp1.getValue();
        String value2 = kvp2.getValue();

        if (_ascending) {
            return value1.compareTo(value2);
        }

        return -value1.compareTo(value2);
    }

    private final boolean _ascending;
    private final boolean _byKey;

}