Qualifiers.java

/*
 * gvNIX is an open source tool for rapid application development (RAD).
 * Copyright (C) 2010 Generalitat Valenciana
 * 
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU 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 General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package org.gvnix.support.dependenciesmanager;

/**
 * Enum for libraries version qualifiers
 * 
 * @author <a href="http://www.disid.com">DISID Corporation S.L.</a> made for <a
 *         href="http://www.dgti.gva.es">General Directorate for Information
 *         Technologies (DGTI)</a>
 * @since 0.7
 */
public enum Qualifiers {

    RELEASE("RELEASE"), EMPTY(""), SNAPSHOT("SNAPSHOT");

    @SuppressWarnings("unused")
    private String qualifier;

    private Qualifiers(String qualifier) {
        this.qualifier = qualifier;
    }

    public boolean isRelease() {
        return this.equals(RELEASE) || this.equals(EMPTY);
    }

    public boolean isSnapshot() {
        return this.equals(SNAPSHOT);
    }

    /**
     * Says if the qualifier is newer than passed qualifier
     * <ul>
     * <li>RELEASE equals to EMPTY</li>
     * <li>RELEASE newer than SNAPSHOT</li>
     * </ul>
     * 
     * @param q
     * @return <ul>
     *         <li>0 if this equals to q</li>
     *         <li>1 if this newer than q</li>
     *         <li>-1 otherwise</li>
     *         </ul>
     */
    public int newerThan(Qualifiers q) {
        if (this.equals(q)) {
            return 0;
        }

        if (this.isRelease() && q.isSnapshot()) {
            return 1;
        }

        return -1;
    }

}