package org.apache.maven.index.search.grouping;

 /*

  * 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 java.util.Comparator;

 import java.util.Map;

 import org.apache.maven.index.ArtifactInfo;

 import org.apache.maven.index.ArtifactInfoGroup;

 import org.apache.maven.index.Grouping;

 /**

  * An abstract {@link Grouping} implementation.

  * 

  * @author Tamas Cservenak

  */

 public abstract class AbstractGrouping

     implements Grouping

 {

     private Comparator<ArtifactInfo> comparator;

     public AbstractGrouping()

     {

         this( ArtifactInfo.VERSION_COMPARATOR );

     }

     public AbstractGrouping( Comparator<ArtifactInfo> comparator )

     {

         super();

         this.comparator = comparator;

     }

     public boolean addArtifactInfo( Map<String, ArtifactInfoGroup> result, ArtifactInfo artifactInfo )

     {

         String key = getGroupKey( artifactInfo );

         ArtifactInfoGroup group = result.get( key );

         if ( group == null )

         {

             group = new ArtifactInfoGroup( key, comparator );

             result.put( key, group );

         }

         return group.addArtifactInfo( artifactInfo );

     }

     protected abstract String getGroupKey( ArtifactInfo artifactInfo );

 }