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 javax.validation.constraints.NotNull;
  
  import org.apache.apex.malhar.lib.streamquery.index.Index;
  
  /**
   * Abstract class to filter row by binary expression index.
   * <p>
   * Sub class will implement filter/getExpressionName functions.
   * @displayName Binary Expression
   * @category Stream Manipulators
   * @tags alias
   * @since 0.3.4
   * @deprecated
   */
  @Deprecated
  public abstract class BinaryExpression  implements Index
  {
    /**
     * Left column name argument for expression.
     */
    @NotNull
    protected String left;
  
    /**
     * Right column name argument for expression.
     */
    @NotNull
    protected String right;
  
    /**
     *  Alias name for output field.
     */
    protected String alias;
  
    /**
     * @param left column name argument for expression.
     * @param right column name argument for expression.
     * @param alias name for output field.
     */
    public BinaryExpression(@NotNull String left, @NotNull String right, String alias)
    {
      this.left = left;
      this.right = right;
    }
  
    public String getAlias()
    {
      return alias;
    }
  
    public void setAlias(String alias)
    {
      this.alias = alias;
    }
  }
  