library/src/main/java/com/datatorrent/lib/streamquery/condition/InCondition.java

/*
 * Copyright (c) 2013 DataTorrent, Inc. ALL Rights Reserved.
 *
 * Licensed 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 com.datatorrent.lib.streamquery.condition;

import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import javax.validation.constraints.NotNull;

/**
 * An implementation of condition class to check if a column value is in a given set of values.
 * <p>
 * <br>
 * <b>Properties : </b> <br>
 * <b> column : </b> Column name for which value is checked in values set. <br>
 * <b> inValues : </b> Set of values in which column value is checked. <br>
 * @displayName: In Condition
 * @category: streamquery/condition
 * @tag: sql condition
 * @since 0.3.4
 */
public class InCondition extends Condition
{
  /**
   * Column name for which value is checked in values set. 
   */
  @NotNull
  private String column;
  
  /**
   * Set of values in which column value is checked.
   */
  private Set<Object> inValues = new HashSet<Object>();
  
  /**
   * @param  column Column name for which value is checked in values set.
   */
  public InCondition(@NotNull String column) {
    this.column = column;
  }
  
  @Override
  public boolean isValidRow(@NotNull Map<String, Object> row)
  {
    if (!row.containsKey(column)) return false;
    return inValues.contains(row.get(column));
  }

  @Override
  public boolean isValidJoin(@NotNull Map<String, Object> row1, @NotNull Map<String, Object> row2)
  {
    return false;
  }

  public String getColumn()
  {
    return column;
  }

  public void setColumn(String column)
  {
    this.column = column;
  }
  
  public void addInValue(Object value) {
    this.inValues.add(value);
  }
   
}