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19 package javax.faces.webapp;
20
21 import javax.faces.component.EditableValueHolder;
22 import javax.faces.component.UIComponent;
23 import javax.faces.validator.Validator;
24 import javax.servlet.jsp.JspException;
25 import javax.servlet.jsp.tagext.Tag;
26 import javax.servlet.jsp.tagext.TagSupport;
27
28 public abstract class ValidatorELTag extends TagSupport
29 {
30 private static final long serialVersionUID = 8794036166323016663L;
31
32 @Override
33 public int doStartTag() throws JspException
34 {
35 UIComponentClassicTagBase componentTag = UIComponentELTag.getParentUIComponentClassicTagBase(pageContext);
36 if (componentTag == null)
37 {
38 throw new JspException("no parent UIComponentTag found");
39 }
40 if (!componentTag.getCreated())
41 {
42 return Tag.SKIP_BODY;
43 }
44
45 Validator validator = createValidator();
46
47 UIComponent component = componentTag.getComponentInstance();
48 if (component == null)
49 {
50 throw new JspException("parent UIComponentTag has no UIComponent");
51 }
52 if (!(component instanceof EditableValueHolder))
53 {
54 throw new JspException("UIComponent is no EditableValueHolder");
55 }
56 ((EditableValueHolder)component).addValidator(validator);
57
58 return Tag.SKIP_BODY;
59 }
60
61 protected abstract Validator createValidator() throws JspException;
62
63 }