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 java.util.TreeMap;
  
  /**
   * Implements order by key name rule. <br>
   * <p>
   * <b>Properties : </b> <br>
   * <b> columnName : </b> Name of column for ordering tuples. <br>
   * @displayName OrderBy Rule
   * @category Stream Manipulators
   * @tags orderby, sort, comparison
   * @since 0.3.3
   * @deprecated
   */
  @Deprecated
  @SuppressWarnings("rawtypes")
  public class OrderByRule<T extends Comparable>
  {
  
    /**
     * column name for ordering tuples.
     */
    private String columnName;
  
    public OrderByRule(String name)
    {
  
      columnName = name;
    }
  
    /**
     * sort rows by each rule and emit result on output port.
     */
    @SuppressWarnings("unchecked")
    public ArrayList<Map<String, Object>> sort(ArrayList<Map<String, Object>> rows)
    {
  
      TreeMap<T, ArrayList<Map<String, Object>>> sorted = new TreeMap<T, ArrayList<Map<String, Object>>>();
      for (int i = 0; i < rows.size(); i++) {
        Map<String, Object> row = rows.get(i);
        if (row.containsKey(columnName)) {
          T value = (T)row.get(columnName);
          ArrayList<Map<String, Object>> list;
          if (sorted.containsKey(value)) {
            list = sorted.get(value);
          } else {
            list = new ArrayList<Map<String, Object>>();
            sorted.put(value, list);
          }
          list.add(row);
        }
      }
      ArrayList<Map<String, Object>> result = new ArrayList<Map<String, Object>>();
      for (Map.Entry<T, ArrayList<Map<String, Object>>> entry : sorted.entrySet()) {
        result.addAll(entry.getValue());
      }
      return result;
    }
  
    /**
     * @return the columnName
     */
    public String getColumnName()
    {
  
      return columnName;
    }
  
    /**
     * @param columnName
     *          the columnName to set
     */
    public void setColumnName(String columnName)
    {
  
      this.columnName = columnName;
    }
  }
  