ValidatorTag


1   /*
2    * Copyright 1999-2004 The Apache Software Foundation.
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.apache.cocoon.faces.taglib;
17  
18  import org.apache.cocoon.taglib.TagSupport;
19  
20  import org.apache.cocoon.faces.FacesUtils;
21  import org.xml.sax.Attributes  ;
22  import org.xml.sax.SAXException  ;
23  
24  import javax.faces.component.EditableValueHolder;
25  import javax.faces.validator.Validator;
26  
27  /**
28   * Base class for validator tags.
29   * Can be extended to implement custom validators.
30   * 
31   * @version CVS $Id: ValidatorTag.java 53791 2004-10-05 13:16:15Z vgritsenko $
32   */
33  public class ValidatorTag extends TagSupport {
34  
35      private String   validatorId;
36  
37      public String   getValidatorId() {
38          return this.validatorId;
39      }
40  
41      public void setValidatorId(String   validatorId) {
42          this.validatorId = validatorId;
43      }
44  
45      public int doStartTag(String   namespaceURI, String   localName, String   qName, Attributes   atts)
46      throws SAXException   {
47          UIComponentTag tag = FacesUtils.findParentUIComponentTag(this);
48          if (tag == null) {
49              throw new SAXException  ("Tag <" + getClass().getName() + "> have to be nested within a UIComponentTag");
50          }
51  
52          if (!tag.getCreated()) {
53              return 0;
54          }
55  
56          Validator validator = createValidator();
57          ((EditableValueHolder)tag.getComponentInstance()).addValidator(validator);
58  
59          return SKIP_BODY;
60      }
61  
62      /**
63       * Override to create custom validator
64       */
65      protected Validator createValidator() {
66          final UIComponentTag tag = FacesUtils.findParentUIComponentTag(this);
67          String   validatorIdVal = (String  ) tag.evaluate(validatorId);
68          return tag.getApplication().createValidator(validatorIdVal);
69      }
70  
71      public void recycle() {
72          super.recycle();
73          this.validatorId = null;
74      }
75  }
76
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