| // Copyright (C) 2018 The Android Open Source Project, 2009-2015 Elasticsearch |
| // |
| // Licensed 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 com.google.gerrit.elasticsearch.builders; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * A Query that matches documents matching boolean combinations of other queries. |
| * |
| * <p>A trimmed down version of org.elasticsearch.index.query.BoolQueryBuilder. |
| */ |
| public class BoolQueryBuilder extends QueryBuilder { |
| |
| private final List<QueryBuilder> mustClauses = new ArrayList<>(); |
| |
| private final List<QueryBuilder> mustNotClauses = new ArrayList<>(); |
| |
| private final List<QueryBuilder> filterClauses = new ArrayList<>(); |
| |
| private final List<QueryBuilder> shouldClauses = new ArrayList<>(); |
| |
| /** |
| * Adds a query that <b>must</b> appear in the matching documents and will contribute to scoring. |
| */ |
| public BoolQueryBuilder must(QueryBuilder queryBuilder) { |
| mustClauses.add(queryBuilder); |
| return this; |
| } |
| |
| /** |
| * Adds a query that <b>must not</b> appear in the matching documents and will not contribute to |
| * scoring. |
| */ |
| public BoolQueryBuilder mustNot(QueryBuilder queryBuilder) { |
| mustNotClauses.add(queryBuilder); |
| return this; |
| } |
| |
| /** |
| * Adds a query that <i>should</i> appear in the matching documents. For a boolean query with no |
| * <tt>MUST</tt> clauses one or more <code>SHOULD</code> clauses must match a document for the |
| * BooleanQuery to match. |
| */ |
| public BoolQueryBuilder should(QueryBuilder queryBuilder) { |
| shouldClauses.add(queryBuilder); |
| return this; |
| } |
| |
| @Override |
| protected void doXContent(XContentBuilder builder) throws IOException { |
| builder.startObject("bool"); |
| doXArrayContent("must", mustClauses, builder); |
| doXArrayContent("filter", filterClauses, builder); |
| doXArrayContent("must_not", mustNotClauses, builder); |
| doXArrayContent("should", shouldClauses, builder); |
| builder.endObject(); |
| } |
| |
| private void doXArrayContent(String field, List<QueryBuilder> clauses, XContentBuilder builder) |
| throws IOException { |
| if (clauses.isEmpty()) { |
| return; |
| } |
| if (clauses.size() == 1) { |
| builder.field(field); |
| clauses.get(0).toXContent(builder); |
| } else { |
| builder.startArray(field); |
| for (QueryBuilder clause : clauses) { |
| clause.toXContent(builder); |
| } |
| builder.endArray(); |
| } |
| } |
| } |