hudson.plugins.simpleupdatesite.VersionNumber.java Source code

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Here is the source code for hudson.plugins.simpleupdatesite.VersionNumber.java

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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 *
 * Contributor(s):
 *
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package hudson.plugins.simpleupdatesite;

import java.util.StringTokenizer;

import org.apache.commons.lang.math.NumberUtils;

/**
 * Immutable representation of a dot or '-'-separated digits (such as "1.0.1" or
 * "1.0-52").
 * 
 * {@link VersionNumber}s are {@link Comparable}.
 * 
 * <h2>Special tokens</h2>
 * <p>
 * We allow a component to be not just a number, but also "ea", "ea1", "ea2".
 * "ea" is treated as "ea0", and eaN &lt; M for any M > 0.
 * 
 * <p>
 * '*' is also allowed as a component, and '*' > M for any M > 0.
 * 
 * <p>
 * 'SNAPSHOT' is also allowed as a component, and "N.SNAPSHOT" is interpreted as
 * "N-1.*"
 * 
 * <pre>
 * 2.0.* &gt; 2.0.1 &gt; 2.0.1-SNAPSHOT &gt; 2.0.0.99 &gt; 2.0.0 &gt; 2.0.ea &gt; 2.0
 * </pre>
 * 
 * @author Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
 * @since 1.139
 */
public class VersionNumber implements Comparable<VersionNumber> {
    private final int[] digits;

    /**
     * Parses a string like "1.0.2" into the version number.
     * 
     * @throws IllegalArgumentException
     *             if the parsing fails.
     */
    public VersionNumber(String num) {
        StringTokenizer tokens = new StringTokenizer(num, ".-");
        this.digits = new int[tokens.countTokens()];
        if (this.digits.length < 2) {
            throw new IllegalArgumentException("Failed to parse " + num + " as version number");
        }

        int i = 0;
        while (tokens.hasMoreTokens()) {
            String token = tokens.nextToken().toLowerCase();
            if (token.equals("*")) {
                this.digits[i++] = 1000;
            } else if (token.startsWith("snapshot")) {
                this.digits[i - 1]--;
                this.digits[i++] = 1000;
                break;
            } else if (token.startsWith("ea")) {
                if (token.length() == 2) {
                    this.digits[i++] = -1000; // just "ea"
                } else {
                    this.digits[i++] = -1000 + Integer.parseInt(token.substring(2)); // "eaNNN"
                }
            } else {
                if (NumberUtils.isNumber(token)) {
                    this.digits[i++] = Integer.parseInt(token);
                }
            }
        }
    }

    @Override
    public String toString() {
        StringBuffer buf = new StringBuffer();
        for (int i = 0; i < this.digits.length; i++) {
            if (i != 0) {
                buf.append('.');
            }
            buf.append(Integer.toString(this.digits[i]));
        }
        return buf.toString();
    }

    public boolean isOlderThan(VersionNumber rhs) {
        return compareTo(rhs) < 0;
    }

    public boolean isNewerThan(VersionNumber rhs) {
        return compareTo(rhs) > 0;
    }

    @Override
    public boolean equals(Object o) {
        if (!(o instanceof VersionNumber)) {
            return false;
        }
        return compareTo((VersionNumber) o) == 0;
    }

    @Override
    public int hashCode() {
        int x = 0;
        for (int i : this.digits) {
            x = x << 1 | i;
        }
        return x;
    }

    public int compareTo(VersionNumber rhs) {
        for (int i = 0;; i++) {
            if (i == this.digits.length && i == rhs.digits.length) {
                return 0; // equals
            }
            if (i == this.digits.length) {
                return -1; // rhs is larger
            }
            if (i == rhs.digits.length) {
                return 1;
            }

            int r = this.digits[i] - rhs.digits[i];
            if (r != 0) {
                return r;
            }
        }
    }
}