1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.myfaces.trinidad.webapp;
20
21 import javax.faces.component.EditableValueHolder;
22 import javax.faces.component.UIComponent;
23 import javax.faces.validator.Validator;
24 import javax.faces.webapp.UIComponentClassicTagBase;
25 import javax.faces.webapp.UIComponentELTag;
26 import javax.servlet.jsp.JspException;
27 import javax.servlet.jsp.tagext.Tag;
28
29 /**
30 * This is the Trinidad version of the JSF <code>ValidatorELTag</code> class.
31 * The main difference is that this class is <b>NOT</b> inheriting from
32 * the standard <code>TagSupport</code> and therefore does not
33 * implement <code>Serializable</code> interface.
34 *
35 * @author Apache MyFaces team
36 */
37 public abstract class TrinidadValidatorELTag extends TrinidadTagSupport
38 {
39 @Override
40 public int doStartTag() throws JspException
41 {
42 UIComponentClassicTagBase componentTag = UIComponentELTag.getParentUIComponentClassicTagBase(pageContext);
43
44 if (componentTag == null)
45 {
46 throw new JspException("no parent UIComponentTag found");
47 }
48
49 if (!componentTag.getCreated())
50 {
51 return Tag.SKIP_BODY;
52 }
53
54 Validator validator = createValidator();
55
56 UIComponent component = componentTag.getComponentInstance();
57 if (component == null)
58 {
59 throw new JspException("parent UIComponentTag has no UIComponent");
60 }
61
62 if (!(component instanceof EditableValueHolder))
63 {
64 throw new JspException("UIComponent is no EditableValueHolder");
65 }
66 ((EditableValueHolder)component).addValidator(validator);
67
68 return Tag.SKIP_BODY;
69 }
70
71 protected abstract Validator createValidator() throws JspException;
72
73 }