Version.java

/*******************************************************************************
 * Copyright (c) 2005, 2009 committers of openArchitectureWare and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     committers of openArchitectureWare - initial API and implementation
 *******************************************************************************/


package org.eclipse.xtend;

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

public class Version implements Comparable<Version> {

	private static final int MAJOR_VERSION = 1;

	private static final int MINOR_VERSION = 2;

	private static final Pattern versionPattern = Pattern.compile("^(\\d+)\\.(\\d+).*");
	
	private int majorVersion;
	
	private int minorVersion;
	
	public Version(final String versionString) {
		if (versionString == null || !isVersionString(versionString))
			throw new IllegalArgumentException();
		
		final Matcher m = versionPattern.matcher(versionString);
		m.find();
		majorVersion = Integer.parseInt(m.group(MAJOR_VERSION));
		minorVersion = Integer.parseInt(m.group(MINOR_VERSION));
	}

	public static boolean isVersionString(String versionString) {
		if (versionString == null)
			return false;
		
		final Matcher m = versionPattern.matcher(versionString);
		return m.find();
	}

	public int compareTo(Version other) {
		if (this == other)
			return 0;
		
		int res = 0;
		if (getMajorVersion() < other.getMajorVersion()) {
			res = -1;
		} else if (getMajorVersion() > other.getMajorVersion()) {
			res = 1;
		} else {
			if (getMinorVersion() < other.getMinorVersion()) {
				res = -1;
			} else if (getMinorVersion() > other.getMinorVersion()) {
				res = 1;
			}
		}
		return res;
	}

	public int getMajorVersion() {
		return majorVersion;
	}

	public int getMinorVersion() {
		return minorVersion;
	}
}