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Java > Open Source Codes > org > apache > tapestry > bean > BindingBeanInitializer


1 // Copyright 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry.bean;
16
17 import org.apache.hivemind.util.Defense;
18 import org.apache.hivemind.util.PropertyUtils;
19 import org.apache.tapestry.IBeanProvider;
20 import org.apache.tapestry.IBinding;
21 import org.apache.tapestry.IComponent;
22 import org.apache.tapestry.binding.BindingConstants;
23 import org.apache.tapestry.binding.BindingSource;
24
25 /**
26  * An {@link org.apache.tapestry.bean.IBeanInitializer}  implementation that uses an
27  * {@link org.apache.tapestry.IBinding}  to obtain the value which will be assigned to the
28  * bean property.
29  *
30  * @author Howard M. Lewis Ship
31  * @since 4.0
32  */
33 public class BindingBeanInitializer extends AbstractBeanInitializer
34 {
35     private BindingSource _bindingSource;
36
37     private String JavaDoc _bindingReference;
38
39     /** @since 4.0 */
40     private IBinding _binding;
41
42     /** @since 4.0 */
43     public BindingBeanInitializer(BindingSource source)
44     {
45         Defense.notNull(source, "source");
46
47         _bindingSource = source;
48     }
49
50     /**
51      * @since 4.0
52      */
53     public void setBindingReference(String JavaDoc bindingReference)
54     {
55         _bindingReference = bindingReference;
56     }
57
58     /** @since 4.0 */
59     public String JavaDoc getBindingReference()
60     {
61         return _bindingReference;
62     }
63
64     public void setBeanProperty(IBeanProvider provider, Object JavaDoc bean)
65     {
66         if (_binding == null)
67         {
68             IComponent component = provider.getComponent();
69
70             String JavaDoc description = BeanMessages.propertyInitializerName(_propertyName);
71
72             _binding = _bindingSource.createBinding(
73                     component,
74                     description,
75                     _bindingReference,
76                     BindingConstants.OGNL_PREFIX,
77                     getLocation());
78         }
79
80         Class JavaDoc propertyType = PropertyUtils.getPropertyType(bean, _propertyName);
81
82         Object JavaDoc bindingValue = _binding.getObject(propertyType);
83
84         setBeanProperty(bean, bindingValue);
85     }
86 }
87
88
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