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Java > Open Source Codes > org > eclipse > core > internal > databinding > internal > beans > JavaBeanObservableMap


1 /*******************************************************************************
2  * Copyright (c) 2006, 2007 IBM Corporation and others.
3  * All rights reserved. This program and the accompanying materials
4  * are made available under the terms of the Eclipse Public License v1.0
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/epl-v10.html
7  *
8  * Contributors:
9  * IBM Corporation - initial API and implementation
10  * Brad Reynolds - bug 171616
11  *******************************************************************************/
12
13 package org.eclipse.core.internal.databinding.internal.beans;
14
15 import java.beans.PropertyChangeListener JavaDoc;
16 import java.beans.PropertyDescriptor JavaDoc;
17 import java.lang.reflect.Method JavaDoc;
18
19 import org.eclipse.core.databinding.beans.IBeanObservable;
20 import org.eclipse.core.databinding.observable.Diffs;
21 import org.eclipse.core.databinding.observable.map.ComputedObservableMap;
22 import org.eclipse.core.databinding.observable.set.IObservableSet;
23 import org.eclipse.core.databinding.util.Policy;
24 import org.eclipse.core.runtime.IStatus;
25 import org.eclipse.core.runtime.Status;
26
27 /**
28  * @since 1.0
29  *
30  */
31 public class JavaBeanObservableMap extends ComputedObservableMap implements IBeanObservable {
32
33     private PropertyDescriptor JavaDoc propertyDescriptor;
34     
35     private PropertyChangeListener JavaDoc elementListener = new PropertyChangeListener JavaDoc() {
36         public void propertyChange(final java.beans.PropertyChangeEvent JavaDoc event) {
37             if (!updating) {
38                 fireMapChange(Diffs.createMapDiffSingleChange(
39                         event.getSource(), event.getOldValue(), event
40                                 .getNewValue()));
41             }
42         }
43     };
44
45     private ListenerSupport listenerSupport;
46
47     private boolean updating = false;
48
49     /**
50      * @param domain
51      * @param propertyDescriptor
52      */
53     public JavaBeanObservableMap(IObservableSet domain,
54             PropertyDescriptor JavaDoc propertyDescriptor) {
55         super(domain);
56         
57         this.propertyDescriptor = propertyDescriptor;
58         this.listenerSupport = new ListenerSupport(elementListener,
59                 propertyDescriptor.getName());
60         init();
61     }
62
63     protected void hookListener(Object JavaDoc domainElement) {
64         listenerSupport.hookListener(domainElement);
65     }
66
67     protected void unhookListener(Object JavaDoc domainElement) {
68         listenerSupport.unhookListener(domainElement);
69     }
70
71     protected Object JavaDoc doGet(Object JavaDoc key) {
72         try {
73             Method JavaDoc readMethod = propertyDescriptor.getReadMethod();
74             if (!readMethod.isAccessible()) {
75                 readMethod.setAccessible(true);
76             }
77             return readMethod.invoke(key, new Object JavaDoc[0]);
78         } catch (Exception JavaDoc e) {
79             Policy.getLog().log(
80                     new Status(IStatus.ERROR, Policy.JFACE_DATABINDING,
81                             IStatus.ERROR, "cannot get value", e)); //$NON-NLS-1$
82 throw new RuntimeException JavaDoc(e);
83         }
84     }
85
86     protected Object JavaDoc doPut(Object JavaDoc key, Object JavaDoc value) {
87         try {
88             Object JavaDoc oldValue = get(key);
89             propertyDescriptor.getWriteMethod().invoke(key,
90                     new Object JavaDoc[] { value });
91             keySet().add(key);
92             return oldValue;
93         } catch (Exception JavaDoc e) {
94             Policy.getLog().log(
95                     new Status(IStatus.ERROR, Policy.JFACE_DATABINDING,
96                             IStatus.ERROR, "cannot set value", e)); //$NON-NLS-1$
97 throw new RuntimeException JavaDoc(e);
98         }
99     }
100
101     /* (non-Javadoc)
102      * @see org.eclipse.core.databinding.beans.IBeanObservable#getObserved()
103      */
104     public Object JavaDoc getObserved() {
105         return keySet();
106     }
107
108     /* (non-Javadoc)
109      * @see org.eclipse.core.databinding.beans.IBeanObservable#getPropertyDescriptor()
110      */
111     public PropertyDescriptor JavaDoc getPropertyDescriptor() {
112         return propertyDescriptor;
113     }
114 }
115
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