package org.codehaus.mojo.versions.ordering;

/*
 * 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.Model;
import org.codehaus.mojo.versions.api.PomHelper;

import java.util.Comparator;
import java.util.Map;

/**
 * Compares project paths relative to the base directory based on their depth in a reactor
 *
 * @author Stephen Connolly
 * @since 15-Sep-2010 14:54:42
 */
public class ReactorDepthComparator
    implements Comparator<String>
{
    private final Map<String, Model> reactor;

    public ReactorDepthComparator( Map<String, Model> reactor )
    {
        this.reactor = reactor;
    }

    public int compare( String o1, String o2 )
    {
        final Model m1 = reactor.get( o1 );
        final Model m2 = reactor.get( o2 );
        final int d1 = PomHelper.getReactorParentCount( reactor, m1 );
        final int d2 = PomHelper.getReactorParentCount( reactor, m2 );
        if ( d1 < d2 )
        {
            return -1;
        }
        else if ( d1 > d2 )
        {
            return 1;
        }
        return PomHelper.getGAV( m1 ).compareTo( PomHelper.getGAV( m2 ) );
    }
}
