VersionComparator.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;

public class VersionComparator {
	/**
	 * Don't allow instantiation.
	 */
	private VersionComparator() {
		throw new UnsupportedOperationException();
	}
	
	public static Version getVMVersion() {
		return new Version(System.getProperty("java.version"));
	}
	
	public static boolean isAtLeastVersion(final String minVersionString) {
		if (minVersionString == null || !Version.isVersionString(minVersionString))
			throw new IllegalArgumentException();
		
		final Version vmVersion = getVMVersion();
		final Version minVersion = new Version(minVersionString);
		return (minVersion.compareTo(vmVersion) <= 0);
	}
	
	public static boolean hasRequiredVersion(final String minVersionString,
			final String maxVersionString) {
		if (minVersionString == null
				|| !Version.isVersionString(minVersionString)
				|| !Version.isVersionString(maxVersionString))
			throw new IllegalArgumentException();
		
		final Version vmVersion = getVMVersion();
		final Version minVersion = new Version(minVersionString);
		final Version maxVersion = new Version(maxVersionString);
		return ((minVersion.compareTo(vmVersion) <= 0) && (vmVersion
				.compareTo(maxVersion) <= 0));
	}

}