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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
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package org.elasticsearch.join.spi;

import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.xcontent.ContextParser;
import org.elasticsearch.common.xcontent.NamedXContentRegistry;
import org.elasticsearch.join.aggregations.ChildrenAggregationBuilder;
import org.elasticsearch.join.aggregations.ParsedChildren;
import org.elasticsearch.plugins.spi.NamedXContentProvider;
import org.elasticsearch.search.aggregations.Aggregation;

import java.util.List;

import static java.util.Collections.singletonList;

public class ParentJoinNamedXContentProvider implements NamedXContentProvider {

    @Override
    public List<NamedXContentRegistry.Entry> getNamedXContentParsers() {
        ParseField parseField = new ParseField(ChildrenAggregationBuilder.NAME);
        ContextParser<Object, Aggregation> contextParser = (p, name) -> ParsedChildren.fromXContent(p, (String) name);
        return singletonList(new NamedXContentRegistry.Entry(Aggregation.class, parseField, contextParser));
    }
}