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;
  import com.datatorrent.api.Operator.Unifier;
  
  /**
   *  An implementation of Operator that provides sql order by operator semantic over live stream data. <br>
   * <p>
   * Input data rows are ordered by order rules, ordered result is emitted on output port. <br>
   * <br>
   *  *  <br>
   *  <b>StateFull : Yes,</b> Operator aggregates input over application window. <br>
   *  <b>Partitions : Yes, </b> This operator is also unifier on output port. <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> orderByRules : </b>List of order by rules for tuples.
   * @displayName OrderBy
   * @category Stream Manipulators
   * @tags orderby operator
   * @since 0.3.5
   * @deprecated
   */
  @Deprecated
  public class OrderByOperator implements Operator, Unifier<Map<String, Object>>
  {
    /**
     * Order by rules.
     */
    ArrayList<OrderByRule<?>> orderByRules = new ArrayList<OrderByRule<?>>();
  
    /**
     * Descending flag.
     */
    private boolean isDescending;
  
    /**
     * collected rows.
     */
    private ArrayList<Map<String, Object>> rows;
  
    /**
     * Add order by rule.
     */
    public void addOrderByRule(OrderByRule<?> rule)
    {
      orderByRules.add(rule);
    }
  
    /**
     * @return isDescending
     */
    public boolean isDescending()
    {
      return isDescending;
    }
  
    /**
     * @param isDescending isDescending
     */
    public void setDescending(boolean isDescending)
    {
      this.isDescending = isDescending;
    }
  
    @Override
    public void process(Map<String, Object> tuple)
    {
      rows.add(tuple);
    }
  
    @Override
    public void beginWindow(long arg0)
    {
      rows = new ArrayList<Map<String, Object>>();
    }
  
    @Override
    public void endWindow()
    {
      for (int i = 0; i < orderByRules.size(); i++) {
        rows = orderByRules.get(i).sort(rows);
      }
      if (isDescending) {
        for (int i = 0; i < rows.size(); i++) {
          outport.emit(rows.get(i));
        }
      } else {
        for (int i = rows.size() - 1; i >= 0; i--) {
          outport.emit(rows.get(i));
        }
      }
    }
  
    @Override
    public void setup(OperatorContext arg0)
    {
      // TODO Auto-generated method stub
  
    }
  
    @Override
    public void teardown()
    {
      // TODO Auto-generated method stub
  
    }
  
    /**
     * 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)
      {
        rows.add(tuple);
      }
    };
  
    /**
     * Output port that emits a map of &lt;string,object&gt;.
     */
    public final transient DefaultOutputPort<Map<String, Object>> outport = new DefaultOutputPort<Map<String, Object>>()
    {
      @Override
      public Unifier<Map<String, Object>> getUnifier()
      {
        OrderByOperator unifier = new OrderByOperator();
        for (int i = 0; i < getOrderByRules().size(); i++) {
          unifier.addOrderByRule(getOrderByRules().get(i));
        }
        unifier.setDescending(isDescending);
        return unifier;
      }
    };
  
    /**
     * @return the orderByRules
     */
    public ArrayList<OrderByRule<?>> getOrderByRules()
    {
      return orderByRules;
    }
  
    /**
     * The order by rules used to order incoming tuples.
     * @param oredrByRules the orderByRules to set
     */
    public void setOrderByRules(ArrayList<OrderByRule<?>> oredrByRules)
    {
      this.orderByRules = oredrByRules;
    }
  }
  