org.kegbot.app.util.Version.java Source code

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Here is the source code for org.kegbot.app.util.Version.java

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/*
 * Copyright 2014 Bevbot LLC <info@bevbot.com>
 *
 * This file is part of the Kegtab package from the Kegbot project. For
 * more information on Kegtab or Kegbot, see <http://kegbot.org/>.
 *
 * Kegtab 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, version 2.
 *
 * Kegtab 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 Kegtab. If not, see <http://www.gnu.org/licenses/>.
 */

package org.kegbot.app.util;

import com.google.common.base.Strings;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Created by mikey on 5/2/14.
 */
public class Version implements Comparable<Version> {

    public final int MAJOR;
    public final int MINOR;
    public final int MICRO;
    public final String EXTRA;

    public static final Version UNKNOWN = new Version(0, 0, 0, "unknown");

    private static final Pattern VERSION_RE = Pattern.compile("(\\d+)\\.(\\d+)\\.(\\d+)([a-z]+\\d+)?");

    public Version(int major, int minor, int micro, String extra) {
        MAJOR = major;
        MINOR = minor;
        MICRO = micro;
        EXTRA = extra;
    }

    public static Version fromString(String versionStr) {
        final Matcher matcher = VERSION_RE.matcher(versionStr);
        if (!matcher.matches()) {
            return UNKNOWN;
        }
        final int major = Integer.valueOf(matcher.group(1));
        final int minor = Integer.valueOf(matcher.group(2));
        final int micro = Integer.valueOf(matcher.group(3));
        final String extra = Strings.nullToEmpty(matcher.group(4));
        return new Version(major, minor, micro, extra);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o)
            return true;
        if (!(o instanceof Version))
            return false;

        Version version = (Version) o;

        if (MAJOR != version.MAJOR)
            return false;
        if (MICRO != version.MICRO)
            return false;
        if (MINOR != version.MINOR)
            return false;
        if (!EXTRA.equals(version.EXTRA))
            return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = MAJOR;
        result = 31 * result + MINOR;
        result = 31 * result + MICRO;
        result = 31 * result + EXTRA.hashCode();
        return result;
    }

    @Override
    public int compareTo(Version other) {
        if (other == UNKNOWN) {
            return this == UNKNOWN ? 0 : 1;
        }
        if (this.MAJOR != other.MAJOR) {
            return this.MAJOR - other.MAJOR;
        }
        if (this.MINOR != other.MINOR) {
            return this.MINOR - other.MINOR;
        }
        return this.MICRO - other.MICRO;
    }
}