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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.hadoop.rest.query;

import org.elasticsearch.hadoop.serialization.Generator;

/**
 * A query that matches on all documents.
 */
public class MatchAllQueryBuilder extends QueryBuilder {
    public static final MatchAllQueryBuilder MATCH_ALL = new MatchAllQueryBuilder();

    private MatchAllQueryBuilder() {}

    @Override
    public int hashCode() {
        return getClass().getName().hashCode();
    }

    @Override
    public boolean equals(Object other) {
        return other != null && getClass() == other.getClass();
    }

    @Override
    public void toJson(Generator out) {
        out.writeFieldName("match_all")
                .writeBeginObject().writeEndObject();
    }
}