org.codehaus.mojo.versions.utils.DependencyComparator Maven / Gradle / Ivy
package org.codehaus.mojo.versions.utils;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import org.apache.maven.model.Dependency;
import java.util.Comparator;
/**
* A comparator used to sort dependencies by group id, artifact id and finally version.
*
* @since 1.0-alpha-1
*/
public class DependencyComparator
implements Comparator
{
/**
* @param d1 the first dependency
* @param d2 the second dependency.
* @return the comparison result
* @see java.util.Comparator#compare(Object, Object)
* @since 1.0-alpha-1
*/
public int compare( Dependency d1, Dependency d2 )
{
int r = d1.getGroupId().compareTo( d2.getGroupId() );
if ( r == 0 )
{
r = d1.getArtifactId().compareTo( d2.getArtifactId() );
}
if ( r == 0 )
{
String v1 = d1.getVersion();
String v2 = d2.getVersion();
if ( v1 == null )
{
// hope I got the +1/-1 the right way around
return v2 == null ? 0 : -1;
}
if ( v2 == null )
{
return 1;
}
r = v1.compareTo( v2 );
}
return r;
}
}