| /* |
| * 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. |
| */ |
| package org.apache.maven.index; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.maven.index.context.IndexingContext; |
| |
| /** |
| * A special reusable filter, that filters the result set to unique Repository-GroupId-ArtifactId combination, leaving |
| * out Version. There is a switch to make the Indexer-wide unique by ignoring repositories too. |
| * |
| * @author cstamas |
| */ |
| public class UniqueArtifactFilterPostprocessor implements ArtifactInfoFilter { |
| public static final String COLLAPSED = "COLLAPSED"; |
| |
| private final Set<Field> uniqueFields = new HashSet<>(); |
| |
| private final Set<String> gas = new HashSet<>(); |
| |
| public UniqueArtifactFilterPostprocessor() {} |
| |
| public UniqueArtifactFilterPostprocessor(Set<Field> uniqueFields) { |
| this.uniqueFields.addAll(uniqueFields); |
| } |
| |
| public boolean accepts(IndexingContext ctx, ArtifactInfo ai) { |
| StringBuilder sb = new StringBuilder(); |
| |
| for (Field field : uniqueFields) { |
| sb.append(ai.getFieldValue(field)).append(":"); |
| } |
| |
| String key = sb.toString().substring(0, sb.length() - 1); |
| |
| if (gas.contains(key)) { |
| return false; |
| } else { |
| gas.add(key); |
| |
| postprocess(ctx, ai); |
| |
| return true; |
| } |
| } |
| |
| public void postprocess(IndexingContext ctx, ArtifactInfo ai) { |
| for (Field field : ai.getFields()) { |
| if (!uniqueFields.contains(field)) { |
| ai.setFieldValue(field, COLLAPSED); |
| } |
| } |
| } |
| |
| public void addField(Field field) { |
| uniqueFields.add(field); |
| } |
| } |