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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.search.aggregations.bucket.filter;

import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Weight;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.internal.SearchContext;

import java.io.IOException;
import java.util.List;
import java.util.Map;

public class FilterAggregatorFactory extends AggregatorFactory<FilterAggregatorFactory> {

    final Weight weight;

    public FilterAggregatorFactory(String name, QueryBuilder filterBuilder, SearchContext context,
            AggregatorFactory<?> parent, AggregatorFactories.Builder subFactoriesBuilder, Map<String, Object> metaData) throws IOException {
        super(name, context, parent, subFactoriesBuilder, metaData);
        IndexSearcher contextSearcher = context.searcher();
        Query filter = filterBuilder.toFilter(context.getQueryShardContext());
        weight = contextSearcher.createNormalizedWeight(filter, false);
    }

    @Override
    public Aggregator createInternal(Aggregator parent, boolean collectsFromSingleBucket, List<PipelineAggregator> pipelineAggregators,
            Map<String, Object> metaData) throws IOException {
        return new FilterAggregator(name, weight, factories, context, parent, pipelineAggregators, metaData);
    }

}