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.Null;
  
  
  /**
   * An implementation of Unary Expression that implements filter method using negate metric sql semantic on column value.
   * <p>
   * @displayName Negate Expression
   * @category Stream Manipulators
   * @tags expression, alias
   * @since 0.3.4
   * @deprecated
   */
  @Deprecated
  public class NegateExpression extends UnaryExpression
  {
  
    /**
     * @param column   Name of column value to be negated.
     */
    public NegateExpression(@Null String column, String alias)
    {
      super(column, alias);
      if (this.alias == null) {
        this.alias = "NEGATE(" + column + ")";
      }
    }
  
    /* (non-Javadoc)
     * @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(column)) {
        return;
      }
      collect.put(alias, -((Number)row.get(column)).doubleValue());
    }
  }
  