NotTransitionCriteria


1   /*
2    * Copyright 2002-2006 the original author or authors.
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, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.springframework.webflow.engine.support;
17  
18  import java.io.Serializable  ;
19  
20  import org.springframework.util.Assert;
21  import org.springframework.webflow.engine.TransitionCriteria;
22  import org.springframework.webflow.execution.RequestContext;
23  
24  /**
25   * Transition criteria that negates the result of the evaluation of
26   * another criteria object.
27   * 
28   * @author Keith Donald
29   */
30  public class NotTransitionCriteria implements TransitionCriteria, Serializable   {
31  
32      /**
33       * The criteria to negate.
34       */
35      private TransitionCriteria criteria;
36      
37      /**
38       * Create a new transition criteria object that will negate
39       * the result of given criteria object.
40       * @param criteria the criteria to negate 
41       */
42      public NotTransitionCriteria(TransitionCriteria criteria) {
43          Assert.notNull(criteria, "The criteria object to negate is required");
44          this.criteria = criteria;
45      }
46      
47      public boolean test(RequestContext context) {
48          return !criteria.test(context);
49      }
50      
51      public String   toString() {
52          return "[not(" + criteria + ")]";
53      }
54  }

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