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.malhar.contrib.misc.streamquery;
  
  import java.util.ArrayList;
  import java.util.Map;
  
  import com.datatorrent.api.Context.OperatorContext;
  import com.datatorrent.api.DefaultInputPort;
  import com.datatorrent.api.DefaultOutputPort;
  import com.datatorrent.api.Operator;
  
  /**
   * An implementation of Operator that provides sql top select query semantic on live data stream. <br>
   * <p>
   * Stream rows passing condition are emitted on output port stream. <br>
   * <br>
   * <b>StateFull : NO,</b> all row data is processed in current time window. <br>
   * <b>Partitions : Yes, </b> No Input dependency among input rows. <br>
   * <br>
   * <b>Ports</b>:<br>
   * <b> inport : </b> Input hash map(row) port, expects
   * HashMap&lt;String,Object&gt;<<br>
   * <b> outport : </b> Output hash map(row) port, emits
   * HashMap&lt;String,Object&gt;<br>
   * <br>
   * <b> Properties : <b> <br>
   * <b> topValue : </b> top values count. <br>
   * <b> isPercentage : </b> top values count is percentage flag.
   * <br>
   * @displayName Select Top
   * @category Stream Manipulators
   * @tags sql select, sql top operator
   *  @since 0.3.4
   *  @deprecated
   */
  @Deprecated
  public class SelectTopOperator implements Operator
  {
    private ArrayList<Map<String, Object>> list;
    private int topValue = 1;
    private boolean isPercentage = false;
  
    /**
     * Input port that takes a map of &lt;string,object&gt;.
     */
    public final transient DefaultInputPort<Map<String, Object>> inport = new DefaultInputPort<Map<String, Object>>()
    {
      @Override
      public void process(Map<String, Object> tuple)
      {
        list.add(tuple);
      }
    };
  
    @Override
    public void setup(OperatorContext context)
    {
      // TODO Auto-generated method stub
  
    }
  
    @Override
    public void teardown()
    {
      // TODO Auto-generated method stub
  
    }
  
    @Override
    public void beginWindow(long windowId)
    {
      list = new ArrayList<Map<String, Object>>();
    }
  
    @Override
    public void endWindow()
    {
      int numEmits = topValue;
      if (isPercentage) {
        numEmits = list.size() * (topValue / 100);
      }
      for (int i = 0; (i < numEmits) && (i < list.size()); i++) {
        outport.emit(list.get(i));
      }
    }
  
    public int getTopValue()
    {
      return topValue;
    }
  
    public void setTopValue(int topValue) throws Exception
    {
      if (topValue <= 0) {
        throw new Exception("Top value must be positive number.");
      }
      this.topValue = topValue;
    }
  
    public boolean isPercentage()
    {
      return isPercentage;
    }
  
    public void setPercentage(boolean isPercentage)
    {
      this.isPercentage = isPercentage;
    }
  
    /**
     * Output port that emits a map of &lt;string,object&gt;.
     */
    public final transient DefaultOutputPort<Map<String, Object>> outport =  new DefaultOutputPort<Map<String, Object>>();
  }
  