library/src/main/java/com/datatorrent/lib/testbench/HashTestSink.java

/*
 * Copyright (c) 2013 DataTorrent, Inc. ALL Rights Reserved.
 *
 * Licensed 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.datatorrent.lib.testbench;

import com.datatorrent.api.Sink;

import java.util.HashMap;
import org.apache.commons.lang.mutable.MutableInt;

/**
 * A sink implementation, which counts the number of times each tuples is collected and stores the results in a hash map.
 * <p></p>
 * @displayName Hash Count Test Sink
 * @category Testbench
 * @tags sink, count
 * @since 0.3.2
 */
public class HashTestSink<T> implements Sink<T>
{
  public HashMap<T, MutableInt> map = new HashMap<T, MutableInt>();
  public int count = 0;

  /**
   * clears data
   */
  public void clear()
  {
    this.map.clear();
    this.count = 0;
  }

  public int size()
  {
    return map.size();
  }

  public int getCount(T key)
  {
    int ret = -1;
    MutableInt val = map.get(key);
    if (val != null)
    {
      ret = val.intValue();
    }
    return ret;
  }

  @Override
  public void put(T tuple)
  {
      this.count++;
      MutableInt val = map.get(tuple);
      if (val == null) {
        val = new MutableInt(0);
        map.put(tuple, val);
      }
      val.increment();
  }

  @Override
  public int getCount(boolean reset)
  {
    throw new UnsupportedOperationException("Not supported yet.");
  }
}