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.index;
  
  import java.util.Map;
  
  import javax.validation.constraints.NotNull;
  
  
  /**
   * Implements sum on column index.
   * <p>
   * Select index class for implementing sum column index.
   * @displayName Sum Expression
   * @category Stream Manipulators
   * @tags sum
   * @since 0.3.4
   * @deprecated
   */
  @Deprecated
  public class SumExpression extends BinaryExpression
  {
  
    /**
     * @param left column name argument for expression.
     * @param right column name argument for expression.
     * @param alias name for output field.
     */
    public SumExpression(@NotNull String left, @NotNull String right, String alias)
    {
      super(left, right, alias);
      if (this.alias == null) {
        this.alias = "SUM(" + left + "," + right + ")";
      }
    }
  
    /* sum column values.
     * @see org.apache.apex.malhar.lib.streamquery.index.Index#filter(java.util.Map, java.util.Map)
     */
    @Override
    public void filter(Map<String, Object> row, Map<String, Object> collect)
    {
      if (!row.containsKey(left) || !row.containsKey(right)) {
        return;
      }
      collect.put(alias, ((Number)row.get(left)).doubleValue() + ((Number)row.get(right)).doubleValue());
    }
  
  }
  