/*
* Sonatype Nexus (TM) Open Source Version
* Copyright (c) 2007-2014 Sonatype, Inc.
* All rights reserved. Includes the third-party code listed at http://links.sonatype.com/products/nexus/oss/attributions.
*
* This program and the accompanying materials are made available under the terms of the Eclipse Public License Version 1.0,
* which accompanies this distribution and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Sonatype Nexus (TM) Professional Version is available from Sonatype, Inc. "Sonatype" and "Sonatype Nexus" are trademarks
* of Sonatype, Inc. Apache Maven is a trademark of the Apache Software Foundation. M2eclipse is a trademark of the
* Eclipse Foundation. All other trademarks are the property of their respective owners.
*/
package org.sonatype.nexus.proxy.maven.metadata.operations;
import java.util.Comparator;
import org.eclipse.aether.util.version.GenericVersionScheme;
import org.eclipse.aether.version.InvalidVersionSpecificationException;
import org.eclipse.aether.version.Version;
import org.eclipse.aether.version.VersionScheme;
/**
* version comparator used elsewhere to keep version collections sorted
*
* @author Oleg Gusakov
*/
public class VersionComparator
implements Comparator<String>
{
private final VersionScheme versionScheme;
public VersionComparator() {
this.versionScheme = new GenericVersionScheme();
}
public int compare(final String v1, final String v2) {
if (v1 == null || v2 == null) {
throw new IllegalArgumentException();
}
final Version av1 = parseVersion(v1);
final Version av2 = parseVersion(v2);
return av1.compareTo(av2);
}
protected Version parseVersion(final String v) {
try {
return versionScheme.parseVersion(v);
}
catch (InvalidVersionSpecificationException e) {
// from implementation (coming from Aether) we know today this will never happen
// but is here probably for future. Also, we do not deal with ranges, only single version strings
return null;
}
}
}