content: /*
   * 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
   *
   *     https://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.avro.mapred;
  
  import java.io.IOException;
  
  import org.apache.hadoop.io.NullWritable;
  import org.apache.hadoop.mapred.OutputCollector;
  
  @SuppressWarnings("unchecked")
  class MapCollector<OUT, K, V, KO, VO> extends AvroCollector<OUT> {
    private final AvroWrapper<OUT> wrapper = new AvroWrapper<>(null);
    private final AvroKey<K> keyWrapper = new AvroKey<>(null);
    private final AvroValue<V> valueWrapper = new AvroValue<>(null);
    private OutputCollector<KO, VO> collector;
    private boolean isMapOnly;
  
    public MapCollector(OutputCollector<KO, VO> collector, boolean isMapOnly) {
      this.collector = collector;
      this.isMapOnly = isMapOnly;
    }
  
    @Override
    public void collect(OUT datum) throws IOException {
      if (isMapOnly) {
        wrapper.datum(datum);
        collector.collect((KO) wrapper, (VO) NullWritable.get());
      } else {
        // split a pair
        Pair<K, V> pair = (Pair<K, V>) datum;
        keyWrapper.datum(pair.key());
        valueWrapper.datum(pair.value());
        collector.collect((KO) keyWrapper, (VO) valueWrapper);
      }
    }
  }
  