org.codehaus.mojo.versions.utils.PluginComparator 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.Plugin;
import org.apache.maven.model.ReportPlugin;
import java.util.Comparator;
/**
* A comparator used to sort plugins and report plugins by group id, artifact id and finally version.
*
* @since 1.0-beta-1
*/
public class PluginComparator
implements Comparator
{
/**
* Compares to {@link Plugin} or {@link ReportPlugin} instances.
*
* @param o1 the first object
* @param o2 the second object.
* @return the comparison result
* @see java.util.Comparator#compare(Object, Object)
* @since 1.0-beta-1
*/
public int compare( Object o1, Object o2 )
{
if ( !( o1 instanceof Plugin || o1 instanceof ReportPlugin ) )
{
throw new IllegalArgumentException(
"This comparator can only be used to compare Plugin and ReportPlugin instances" );
}
if ( !( o2 instanceof Plugin || o2 instanceof ReportPlugin ) )
{
throw new IllegalArgumentException(
"This comparator can only be used to compare Plugin and ReportPlugin instances" );
}
String g1 = o1 instanceof Plugin ? ( (Plugin) o1 ).getGroupId() : ( (ReportPlugin) o1 ).getGroupId();
String g2 = o2 instanceof Plugin ? ( (Plugin) o2 ).getGroupId() : ( (ReportPlugin) o2 ).getGroupId();
int r = g1.compareTo( g2 );
if ( r == 0 )
{
String a1 = o1 instanceof Plugin ? ( (Plugin) o1 ).getArtifactId() : ( (ReportPlugin) o1 ).getArtifactId();
String a2 = o2 instanceof Plugin ? ( (Plugin) o2 ).getArtifactId() : ( (ReportPlugin) o2 ).getArtifactId();
r = a1.compareTo( a2 );
}
if ( r == 0 )
{
String v1 = o1 instanceof Plugin ? ( (Plugin) o1 ).getVersion() : ( (ReportPlugin) o1 ).getVersion();
String v2 = o2 instanceof Plugin ? ( (Plugin) o2 ).getVersion() : ( (ReportPlugin) o2 ).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;
}
}