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