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

/**
 * 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 com.datatorrent.lib.testbench;

import java.util.HashMap;
import java.util.Map;

import com.datatorrent.api.DefaultInputPort;
import com.datatorrent.api.DefaultOutputPort;
import com.datatorrent.common.util.BaseOperator;

/**
 * <p>Implements Compare Filter Tuples class.</p>
 * <p>
 * @displayName Compare Filter Tuples
 * @category Test Bench
 * @tags map, compare
 * @since 0.3.2
 */
public class CompareFilterTuples<k> extends BaseOperator
{
  // Compare type function
  private Compare compareType = Compare.Equal;
  public enum Compare
  {
    Smaller, Equal, Greater
  }

  /**
   * Compare the incoming value with the Property value.
   * @param type Compare
  */
  public void setCompareType(Compare type)
  {
    compareType = type;
  }

  // compare value
  private int value;
  public void setValue(int value)
  {
    this.value = value;
  }

  // Collected result tuples
  private Map<k, Integer> result;

  /**
   * Input port that takes a map of integer values.
   */

  public final transient DefaultInputPort<Map<k, Integer>> inport = new DefaultInputPort<Map<k, Integer>>()
  {
    @Override
    public void process(Map<k, Integer> map)
    {
      for (Map.Entry<k, Integer> entry : map.entrySet()) {
        if (compareType == Compare.Equal) {
          if (entry.getValue().intValue() == value) {
            result.put(entry.getKey(),
                entry.getValue());
          }
        }
        if (compareType == Compare.Greater) {
          if (entry.getValue().intValue() > value) {
            result.put(entry.getKey(),
                entry.getValue());
          }
        }
        if (compareType == Compare.Smaller) {
          if (entry.getValue().intValue() < value) {
            result.put(entry.getKey(),
                entry.getValue());
          }
        }
      }
    }
  };

  /**
   * Output port that emits a map of integer values.
   */
  public final transient DefaultOutputPort<Map<k, Integer>> outport = new DefaultOutputPort<Map<k, Integer>>();

        /**
   * Output redis port that emits a map of &lt;integer,string&gt; values.
   */
  public final transient DefaultOutputPort<Map<Integer, String>> redisport = new DefaultOutputPort<Map<Integer, String>>();

  @Override
  public void beginWindow(long windowId)
  {
    result  = new HashMap<k, Integer>();
  }

  @Override
  public void endWindow()
  {
    outport.emit(result);

    int numOuts = 1;
    Integer total = 0;
    for (Map.Entry<k, Integer>  entry : result.entrySet()) {
      Map<Integer, String> tuple = new HashMap<Integer, String>();
      tuple.put(numOuts++, entry.getKey().toString());
      redisport.emit(tuple);
      total += entry.getValue();
    }
    Map<Integer, String> tuple = new HashMap<Integer, String>();
    tuple.put(numOuts++, total.toString());
    redisport.emit(tuple);
    tuple = new HashMap<Integer, String>();
    tuple.put(0, new Integer(numOuts).toString());
    redisport.emit(tuple);
  }
}