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1   /*
2    * Copyright 2004-2006 the Seasar Foundation and the Others.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, 
13   * either express or implied. See the License for the specific language
14   * governing permissions and limitations under the License.
15   */
16  package org.seasar.tuigwaa.database.function.criteria;
17  
18  /***
19   * @author someda
20   */
21  public class IsNullCriteriaFunction extends AbstractCriteriaFunction {
22  
23  	public IsNullCriteriaFunction(){
24  		super();
25  	}
26  	
27  	public IsNullCriteriaFunction(String field){
28  		super(field);
29  	}
30  	
31  	public IsNullCriteriaFunction(String field, Object value){
32  		super(field,value);
33  	}
34  	
35  	public Object evaluate(ICriteria criteria) {
36  		return criteria.addIsNull(getField());
37  	}
38  
39  	public Object evaluate(ICriteria criteria, Object right) {
40  		return evaluate(criteria);
41  	}
42  
43  }