01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * Resin Open Source is free software; you can redistribute it and/or modify
10: * it under the terms of the GNU General Public License as published by
11: * the Free Software Foundation; either version 2 of the License, or
12: * (at your option) any later version.
13: *
14: * Resin Open Source is distributed in the hope that it will be useful,
15: * but WITHOUT ANY WARRANTY; without even the implied warranty of
16: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17: * of NON-INFRINGEMENT. See the GNU General Public License for more
18: * details.
19: *
20: * You should have received a copy of the GNU General Public License
21: * along with Resin Open Source; if not, write to the
22: * Free SoftwareFoundation, Inc.
23: * 59 Temple Place, Suite 330
24: * Boston, MA 02111-1307 USA
25: *
26: * @author Alex Rojkov
27: */
28:
29: package javax.faces.webapp;
30:
31: import javax.servlet.jsp.tagext.TagSupport;
32: import javax.servlet.jsp.tagext.Tag;
33: import javax.servlet.jsp.JspException;
34: import javax.faces.convert.Converter;
35: import javax.faces.component.ValueHolder;
36: import javax.faces.component.UIComponent;
37: import javax.faces.context.FacesContext;
38:
39: public abstract class ConverterELTag extends TagSupport {
40:
41: public int doStartTag() throws JspException {
42: UIComponentClassicTagBase parent = UIComponentClassicTagBase
43: .getParentUIComponentClassicTagBase(pageContext);
44:
45: if (parent == null)
46: throw new JspException(
47: "ConverterELTag must be nested inside a UIComponent tag.");
48:
49: if (parent.getCreated()) {
50:
51: UIComponent component = parent.getComponentInstance();
52:
53: if (!(component instanceof ValueHolder))
54: throw new JspException(
55: "UIComponent parent of converter must be a ValueHolder.");
56:
57: Converter converter = createConverter();
58:
59: ValueHolder valueHolder = (ValueHolder) component;
60: valueHolder.setConverter(converter);
61:
62: Object obj = valueHolder.getLocalValue();
63:
64: if (obj instanceof String) {
65: FacesContext context = FacesContext
66: .getCurrentInstance();
67: Object value = converter.getAsObject(context,
68: component, (String) obj);
69: valueHolder.setValue(value);
70: }
71: }
72:
73: return Tag.SKIP_BODY;
74: }
75:
76: protected abstract Converter createConverter() throws JspException;
77: }
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