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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.index.query;
import org.apache.lucene.search.Query;
import org.elasticsearch.action.support.ToXContentToBytes;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentType;
import java.io.IOException;
import java.util.Objects;
/**
* A {@link QueryBuilder} that is a stand in replacement for an empty query clause in the DSL.
* The current DSL allows parsing inner queries / filters like "{ }", in order to have a
* valid non-null representation of these clauses that actually do nothing we can use this class.
*
* This builder has no corresponding parser and it is not registered under the query name. It is
* intended to be used internally as a stand-in for nested queries that are left empty and should
* be ignored upstream.
*/
public final class EmptyQueryBuilder extends AbstractQueryBuilder<EmptyQueryBuilder> {
public static final String NAME = "empty_query";
/** the one and only empty query builder */
public static final EmptyQueryBuilder PROTOTYPE = new EmptyQueryBuilder();
@Override
public String getWriteableName() {
return NAME;
}
@Override
protected Query doToQuery(QueryShardContext context) throws IOException {
return null;
}
@Override
public String getName() {
return getWriteableName();
}
@Override
protected void doXContent(XContentBuilder builder, Params params) throws IOException {
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
}
@Override
protected EmptyQueryBuilder doReadFrom(StreamInput in) throws IOException {
return new EmptyQueryBuilder();
}
@Override
protected int doHashCode() {
return 31;
}
@Override
protected boolean doEquals(EmptyQueryBuilder other) {
return true;
}
}
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