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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 com.aliyun.odps.table.distribution;

import java.util.List;
import java.util.Optional;

/**
 * A distribution for clustered table.
 */
public class ClusteredDistribution implements Distribution {

    private final List clusterKeys;
    private final Type clusterType;
    private final int bucketsNumber;

    public ClusteredDistribution(List clusterKeys, Type clusterType, int bucketsNumber) {
        this.clusterKeys = clusterKeys;
        this.clusterType = clusterType;
        this.bucketsNumber = bucketsNumber;
    }

    public List getClusterKeys() {
        return clusterKeys;
    }

    public Optional getBucketsNumber() {
        return bucketsNumber > 0 ?
                Optional.of(bucketsNumber) : Optional.empty();
    }

    @Override
    public Type getType() {
        return clusterType;
    }

}