/*
 * 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.flink.streaming.connectors.kafka.testutils;

import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.connector.kafka.sink.KafkaPartitioner;

/**
 * Special partitioner that uses the first field of a 2-tuple as the partition, and that expects a
 * specific number of partitions.
 */
public class Tuple2FlinkPartitioner implements KafkaPartitioner<Tuple2<Integer, Integer>> {
    private static final long serialVersionUID = -3589898230375281549L;

    private final int expectedPartitions;

    public Tuple2FlinkPartitioner(int expectedPartitions) {
        this.expectedPartitions = expectedPartitions;
    }

    @Override
    public int partition(
            Tuple2<Integer, Integer> next,
            byte[] key,
            byte[] value,
            String targetTopic,
            int[] partitions) {
        if (partitions.length != expectedPartitions) {
            throw new IllegalArgumentException("Expected " + expectedPartitions + " partitions");
        }

        return next.f0;
    }
}
