org.silverpeas.components.jdbcconnector.service.comparators.Equality.java Source code

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Here is the source code for org.silverpeas.components.jdbcconnector.service.comparators.Equality.java

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/*
 * Copyright (C) 2000 - 2018 Silverpeas
 *
 * 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.
 *
 * As a special exception to the terms and conditions of version 3.0 of
 * the GPL, you may redistribute this Program in connection with Free/Libre
 * Open Source Software ("FLOSS") applications as described in Silverpeas's
 * FLOSS exception.  You should have received a copy of the text describing
 * the FLOSS exception, and it is also available here:
 * "https://www.silverpeas.org/legal/floss_exception.html"
 *
 * 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 <http://www.gnu.org/licenses/>.
 */

package org.silverpeas.components.jdbcconnector.service.comparators;

import static org.apache.commons.lang3.StringUtils.EMPTY;

/**
 * The equality comparator.
 * @author mmoquillon
 */
public class Equality implements FieldValueComparator {

    public static final String NULL = "null";

    static final String NULL_VALUE = "@null@";
    static final String EMPTY_VALUE = "@empty@";

    @Override
    public boolean compare(final Comparable value, final Comparable referenceValue) {
        if (value == null && NULL_VALUE.equals(referenceValue)) {
            return true;
        } else if (value != null && !NULL_VALUE.equals(referenceValue)) {
            final String finalReferenceValue = EMPTY_VALUE.equals(referenceValue) ? EMPTY
                    : referenceValue.toString();
            return value.toString().compareTo(finalReferenceValue) == 0;
        }
        return false;
    }
}