01: /*
02: * This file is part of the Echo Web Application Framework (hereinafter "Echo").
03: * Copyright (C) 2002-2005 NextApp, Inc.
04: *
05: * Version: MPL 1.1/GPL 2.0/LGPL 2.1
06: *
07: * The contents of this file are subject to the Mozilla Public License Version
08: * 1.1 (the "License"); you may not use this file except in compliance with
09: * the License. You may obtain a copy of the License at
10: * http://www.mozilla.org/MPL/
11: *
12: * Software distributed under the License is distributed on an "AS IS" basis,
13: * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14: * for the specific language governing rights and limitations under the
15: * License.
16: *
17: * Alternatively, the contents of this file may be used under the terms of
18: * either the GNU General Public License Version 2 or later (the "GPL"), or
19: * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
20: * in which case the provisions of the GPL or the LGPL are applicable instead
21: * of those above. If you wish to allow use of your version of this file only
22: * under the terms of either the GPL or the LGPL, and not to allow others to
23: * use your version of this file under the terms of the MPL, indicate your
24: * decision by deleting the provisions above and replace them with the notice
25: * and other provisions required by the GPL or the LGPL. If you do not delete
26: * the provisions above, a recipient may use your version of this file under
27: * the terms of any one of the MPL, the GPL or the LGPL.
28: */
29:
30: package nextapp.echo2.app.componentxml.propertypeer;
31:
32: import org.w3c.dom.Element;
33:
34: import nextapp.echo2.app.componentxml.ComponentIntrospector;
35: import nextapp.echo2.app.componentxml.InvalidPropertyException;
36: import nextapp.echo2.app.componentxml.PropertyXmlPeer;
37:
38: /**
39: * <code>PropertyXmlPeer</code> implementation for
40: * <code>java.lang.Integer</code> properties.
41: */
42: public class IntegerPeer implements PropertyXmlPeer {
43:
44: /**
45: * @see nextapp.echo2.app.componentxml.PropertyXmlPeer#getValue(java.lang.ClassLoader,
46: * java.lang.Class, org.w3c.dom.Element)
47: */
48: public Object getValue(ClassLoader classLoader, Class objectClass,
49: Element propertyElement) throws InvalidPropertyException {
50: String stringValue = propertyElement.getAttribute("value");
51: try {
52: return new Integer(stringValue);
53: } catch (NumberFormatException ex) {
54: return introspectConstantValue(classLoader, objectClass,
55: stringValue);
56: }
57: }
58:
59: /**
60: * @param classLoader the <code>ClassLoader</code> to use for introspection
61: * @param objectClass the <code>Class</code> of object containing candidate
62: * constant values
63: * @param value the name of the constant value
64: * @return an integer representing the constant value, or null if the
65: * constant is not found.
66: */
67: public Integer introspectConstantValue(ClassLoader classLoader,
68: Class objectClass, String value)
69: throws InvalidPropertyException {
70: try {
71: ComponentIntrospector ci = ComponentIntrospector.forName(
72: objectClass.getName(), classLoader);
73: if (value.startsWith(objectClass.getName())) {
74: // Remove class name if required.
75: value = value
76: .substring(objectClass.getName().length() + 1);
77: }
78: Object constantValue = ci.getConstantValue(value);
79: if (constantValue instanceof Integer) {
80: return (Integer) constantValue;
81: } else {
82: return null;
83: }
84: } catch (ClassNotFoundException ex) {
85: // Should not occur.
86: throw new InvalidPropertyException(
87: "Object class not found.", ex);
88: }
89: }
90: }
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