/*
 * 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 org.apache.hudi.client;

import org.apache.spark.Partitioner;

/**
 * Partitioner to route all records to just 1 partition.
 */
public class CoalescingPartitioner extends Partitioner {

  private final int numPartitions;

  CoalescingPartitioner(int numPartitions) {
    this.numPartitions = numPartitions;
  }

  @Override
  public int numPartitions() {
    return numPartitions;
  }

  @Override
  public int getPartition(Object key) {
    if (numPartitions == 1) {
      return 0;
    } else {
      return Math.abs(key.hashCode()) % numPartitions;
    }
  }
}
