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// 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();
}
}
}
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