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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.action.fieldstats;

import org.elasticsearch.action.ShardOperationFailedException;
import org.elasticsearch.action.support.broadcast.BroadcastOperationResponse;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;

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

/**
 */
public class FieldStatsResponse extends BroadcastOperationResponse {

    private Map> indicesMergedFieldStats;

    public FieldStatsResponse() {
    }

    public FieldStatsResponse(int totalShards, int successfulShards, int failedShards, List shardFailures, Map> indicesMergedFieldStats) {
        super(totalShards, successfulShards, failedShards, shardFailures);
        this.indicesMergedFieldStats = indicesMergedFieldStats;
    }

    @Nullable
    public Map getAllFieldStats() {
        return indicesMergedFieldStats.get("_all");
    }

    public Map> getIndicesMergedFieldStats() {
        return indicesMergedFieldStats;
    }

    @Override
    public void readFrom(StreamInput in) throws IOException {
        super.readFrom(in);
        final int size = in.readVInt();
        indicesMergedFieldStats = new HashMap<>(size);
        for (int i = 0; i < size; i++) {
            String key = in.readString();
            int indexSize = in.readVInt();
            Map indexFieldStats = new HashMap<>(indexSize);
            indicesMergedFieldStats.put(key, indexFieldStats);
            for (int j = 0; j < indexSize; j++) {
                key = in.readString();
                FieldStats value = FieldStats.read(in);
                indexFieldStats.put(key, value);
            }
        }
    }

    @Override
    public void writeTo(StreamOutput out) throws IOException {
        super.writeTo(out);
        out.writeVInt(indicesMergedFieldStats.size());
        for (Map.Entry> entry1 : indicesMergedFieldStats.entrySet()) {
            out.writeString(entry1.getKey());
            out.writeVInt(entry1.getValue().size());
            for (Map.Entry entry2 : entry1.getValue().entrySet()) {
                out.writeString(entry2.getKey());
                entry2.getValue().writeTo(out);
            }
        }
    }
}