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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.search.aggregations.bucket.missing;

import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.search.aggregations.AggregationBuilder;

import java.io.IOException;

/**
 * Builder for the {@link Missing} aggregation.
 */
public class MissingBuilder extends AggregationBuilder {

    private String field;

    /**
     * Sole constructor.
     */
    public MissingBuilder(String name) {
        super(name, InternalMissing.TYPE.name());
    }

    /**
     * Set the field to count missing values on.
     */
    public MissingBuilder field(String field) {
        this.field = field;
        return this;
    }

    @Override
    protected XContentBuilder internalXContent(XContentBuilder builder, Params params) throws IOException {
        builder.startObject();
        if (field != null) {
            builder.field("field", field);
        }
        return builder.endObject();
    }
}