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;
20
21 import java.util.HashSet;
22 import java.util.Set;
23
24 import org.apache.maven.index.context.IndexingContext;
25
26 /**
27 * A special reusable filter, that filters the result set to unique Repository-GroupId-ArtifactId combination, leaving
28 * out Version. There is a switch to make the Indexer-wide unique by ignoring repositories too.
29 *
30 * @author cstamas
31 */
32 public class UniqueArtifactFilterPostprocessor implements ArtifactInfoFilter {
33 public static final String COLLAPSED = "COLLAPSED";
34
35 private final Set<Field> uniqueFields = new HashSet<>();
36
37 private final Set<String> gas = new HashSet<>();
38
39 public UniqueArtifactFilterPostprocessor() {}
40
41 public UniqueArtifactFilterPostprocessor(Set<Field> uniqueFields) {
42 this.uniqueFields.addAll(uniqueFields);
43 }
44
45 public boolean accepts(IndexingContext ctx, ArtifactInfo ai) {
46 StringBuilder sb = new StringBuilder();
47
48 for (Field field : uniqueFields) {
49 sb.append(ai.getFieldValue(field)).append(":");
50 }
51
52 String key = sb.toString().substring(0, sb.length() - 1);
53
54 if (gas.contains(key)) {
55 return false;
56 } else {
57 gas.add(key);
58
59 postprocess(ctx, ai);
60
61 return true;
62 }
63 }
64
65 public void postprocess(IndexingContext ctx, ArtifactInfo ai) {
66 for (Field field : ai.getFields()) {
67 if (!uniqueFields.contains(field)) {
68 ai.setFieldValue(field, COLLAPSED);
69 }
70 }
71 }
72
73 public void addField(Field field) {
74 uniqueFields.add(field);
75 }
76 }