package org.codehaus.modello.model;

/*
 * Copyright (c) 2004, Codehaus.org
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/**
 * A version range. Can be of 3 forms:<ul>
 * <li><code>x.y.z</code>: a range of only one precise version,</li>
 * <li><code>x.y.z<b>+</b></code>: a range starting form a precise version (included), without upper limit,</li>
 * <li><code>x.y.z<b>/</b>i.j.k</code>: a range from one version to another (both included).</li>
 * </ul>
 * @author <a href="mailto:evenisse@codehaus.org">Emmanuel Venisse</a>
 */
public class VersionRange {
    private static final String VERSION_SEPARATOR = "/";

    private Version fromVersion;

    private Version toVersion;

    public VersionRange(String versionRange) {
        if (versionRange.endsWith("+")) {
            fromVersion = new Version(versionRange.substring(0, versionRange.length() - 1));

            toVersion = Version.INFINITE;
        } else if (versionRange.indexOf(VERSION_SEPARATOR) > 0 && !versionRange.endsWith(VERSION_SEPARATOR)) {
            int pos = versionRange.indexOf(VERSION_SEPARATOR);

            fromVersion = new Version(versionRange.substring(0, pos));

            toVersion = new Version(versionRange.substring(pos + 1));
        } else {
            fromVersion = new Version(versionRange);

            toVersion = new Version(versionRange);
        }
    }

    public VersionRange(Version version) {
        fromVersion = version;

        toVersion = version;
    }

    public Version getFromVersion() {
        return fromVersion;
    }

    public Version getToVersion() {
        return toVersion;
    }

    public boolean isToInfinite() {
        return toVersion == Version.INFINITE;
    }

    // ----------------------------------------------------------------------
    // Object overrides
    // ----------------------------------------------------------------------

    public int hashCode() {
        return fromVersion.hashCode() + toVersion.hashCode();
    }

    public boolean equals(Object obj) {
        if (!(obj instanceof VersionRange)) {
            return false;
        }

        VersionRange other = (VersionRange) obj;

        return fromVersion.equals(other.fromVersion) && toVersion.equals(other.toVersion);
    }

    public String toString() {
        if (fromVersion.equals(toVersion)) {
            return fromVersion.toString("", ".");
        } else if (toVersion.equals(Version.INFINITE)) {
            return fromVersion.toString("", ".") + "+";
        } else {
            return "[" + fromVersion.toString("", ".") + " => " + toVersion.toString("", ".") + "]";
        }
    }
}
