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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.client.ml;

import org.elasticsearch.client.ml.job.process.ModelSnapshot;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.xcontent.ConstructingObjectParser;
import org.elasticsearch.common.xcontent.XContentParser;

import java.io.IOException;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

/**
 * A response containing the requested snapshots
 */
public class GetModelSnapshotsResponse extends AbstractResultResponse {

    public static final ParseField SNAPSHOTS = new ParseField("model_snapshots");

    @SuppressWarnings("unchecked")
    public static final ConstructingObjectParser PARSER =
            new ConstructingObjectParser<>("get_model_snapshots_response", true,
                    a -> new GetModelSnapshotsResponse((List) a[0], (long) a[1]));

    static {
        PARSER.declareObjectArray(ConstructingObjectParser.constructorArg(), ModelSnapshot.PARSER, SNAPSHOTS);
        PARSER.declareLong(ConstructingObjectParser.constructorArg(), COUNT);
    }

    public static GetModelSnapshotsResponse fromXContent(XContentParser parser) throws IOException {
        return PARSER.parse(parser, null);
    }

    GetModelSnapshotsResponse(List snapshotBuilders, long count) {
        super(SNAPSHOTS, snapshotBuilders.stream().map(ModelSnapshot.Builder::build).collect(Collectors.toList()), count);
    }

    /**
     * The retrieved snapshots
     * @return the retrieved snapshots
     */
    public List snapshots() {
        return results;
    }

    @Override
    public int hashCode() {
        return Objects.hash(count, results);
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        GetModelSnapshotsResponse other = (GetModelSnapshotsResponse) obj;
        return count == other.count && Objects.equals(results, other.results);
    }
}