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
   *
   *   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.apex.examples.mroperator;
  
  import java.io.IOException;
  import java.io.PipedInputStream;
  import java.io.PipedOutputStream;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.apex.malhar.lib.util.KeyHashValPair;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.io.serializer.Deserializer;
  import org.apache.hadoop.io.serializer.SerializationFactory;
  import org.apache.hadoop.io.serializer.Serializer;
  import org.apache.hadoop.mapred.OutputCollector;
  
  /**
   * <p>OutputCollectorImpl class.</p>
   *
   * @since 0.9.0
   */
  @SuppressWarnings("unchecked")
  public class OutputCollectorImpl<K extends Object, V extends Object> implements OutputCollector<K, V>
  {
    private static final Logger logger = LoggerFactory.getLogger(OutputCollectorImpl.class);
  
    private List<KeyHashValPair<K, V>> list = new ArrayList<KeyHashValPair<K, V>>();
  
    public List<KeyHashValPair<K, V>> getList()
    {
      return list;
    }
  
    private transient SerializationFactory serializationFactory;
    private transient Configuration conf = null;
  
    public OutputCollectorImpl()
    {
      conf = new Configuration();
      serializationFactory = new SerializationFactory(conf);
  
    }
  
    private <T> T cloneObj(T t) throws IOException
    {
      Serializer<T> keySerializer;
      Class<T> keyClass;
      PipedInputStream pis = new PipedInputStream();
      PipedOutputStream pos = new PipedOutputStream(pis);
      keyClass = (Class<T>)t.getClass();
      keySerializer = serializationFactory.getSerializer(keyClass);
      keySerializer.open(pos);
      keySerializer.serialize(t);
      Deserializer<T> keyDesiralizer = serializationFactory.getDeserializer(keyClass);
      keyDesiralizer.open(pis);
      T clonedArg0 = keyDesiralizer.deserialize(null);
      pos.close();
      pis.close();
      keySerializer.close();
      keyDesiralizer.close();
      return clonedArg0;
  
    }
  
    @Override
    public void collect(K arg0, V arg1) throws IOException
    {
      if (conf == null) {
        conf = new Configuration();
        serializationFactory = new SerializationFactory(conf);
      }
      list.add(new KeyHashValPair<K, V>(cloneObj(arg0), cloneObj(arg1)));
    }
  }
  