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1   /* 
2    * Copyright 2002-2004 The Apache Software Foundation
3    * Licensed  under the  Apache License,  Version 2.0  (the "License");
4    * you may not use  this file  except in  compliance with the License.
5    * You may obtain a copy of the License at 
6    * 
7    *   http://www.apache.org/licenses/LICENSE-2.0
8    * 
9    * Unless required by applicable law or agreed to in writing, software
10   * distributed  under the  License is distributed on an "AS IS" BASIS,
11   * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY KIND, either  express  or
12   * implied.
13   * 
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.struts.flow.core.source.impl.validity;
18  
19  import org.apache.struts.flow.core.source.SourceValidity;
20  
21  /***
22   * A validation object which is always valid.
23   *
24   * @author <a href="mailto:dev@avalon.apache.org">Avalon Development Team</a>
25   * @version CVS $Revision: 1.4 $ $Date: 2004/02/28 11:47:17 $
26   */
27  public final class NOPValidity
28      implements SourceValidity
29  {
30      public static final SourceValidity SHARED_INSTANCE = new NOPValidity();
31  
32      /***
33       * Check if the component is still valid.
34       * If <code>0</code> is returned the isValid(SourceValidity) must be
35       * called afterwards!
36       * If -1 is returned, the component is not valid anymore and if +1
37       * is returnd, the component is valid.
38       */
39      public int isValid()
40      {
41          return 1;
42      }
43  
44      public int isValid( final SourceValidity newValidity )
45      {
46          if (newValidity instanceof NOPValidity)
47          {
48              return 1;
49          }
50          return -1;
51      }
52  
53      public String toString()
54      {
55          return "NOPValidity";
56      }
57  }