1 package org.apache.maven.index.search.grouping;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.util.Comparator;
23 import java.util.Map;
24
25 import org.apache.maven.index.ArtifactInfo;
26 import org.apache.maven.index.ArtifactInfoGroup;
27 import org.apache.maven.index.Grouping;
28
29 /**
30 * An abstract {@link Grouping} implementation.
31 *
32 * @author Tamas Cservenak
33 */
34 public abstract class AbstractGrouping
35 implements Grouping
36 {
37 private Comparator<ArtifactInfo> comparator;
38
39 public AbstractGrouping()
40 {
41 this( ArtifactInfo.VERSION_COMPARATOR );
42 }
43
44 public AbstractGrouping( Comparator<ArtifactInfo> comparator )
45 {
46 super();
47 this.comparator = comparator;
48 }
49
50 public boolean addArtifactInfo( Map<String, ArtifactInfoGroup> result, ArtifactInfo artifactInfo )
51 {
52 String key = getGroupKey( artifactInfo );
53
54 ArtifactInfoGroup group = result.get( key );
55
56 if ( group == null )
57 {
58 group = new ArtifactInfoGroup( key, comparator );
59
60 result.put( key, group );
61 }
62
63 return group.addArtifactInfo( artifactInfo );
64 }
65
66 protected abstract String getGroupKey( ArtifactInfo artifactInfo );
67
68 }