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1
11 package org.eclipse.debug.internal.ui.viewers.model.provisional;
12
13 import java.util.HashMap  ;
14 import java.util.Map ;
15
16 import org.eclipse.core.runtime.ListenerList;
17 import org.eclipse.core.runtime.SafeRunner;
18 import org.eclipse.jface.util.IPropertyChangeListener;
19 import org.eclipse.jface.util.PropertyChangeEvent;
20 import org.eclipse.jface.util.SafeRunnable;
21
22
29 public class PresentationContext implements IPresentationContext {
30
31 private String fId;
32 private ListenerList fListeners = new ListenerList();
33 private Map fProperties = new HashMap ();
34
35
40 public PresentationContext(String id) {
41 fId = id;
42 }
43
44
47 public String [] getColumns() {
48 return (String []) getProperty(IPresentationContext.PROPERTY_COLUMNS);
49 }
50
51
58 protected void firePropertyChange(String property, Object oldValue, Object newValue) {
59 if (!fListeners.isEmpty()) {
60 final PropertyChangeEvent event = new PropertyChangeEvent(this, property, oldValue, newValue);
61 Object [] listeners = fListeners.getListeners();
62 for (int i = 0; i < listeners.length; i++) {
63 final IPropertyChangeListener listener = (IPropertyChangeListener) listeners[i];
64 SafeRunner.run(new SafeRunnable() {
65 public void run() throws Exception {
66 listener.propertyChange(event);
67 }
68 });
69 }
70 }
71 }
72
73
78 public void setColumns(String [] ids) {
79 setProperty(IPresentationContext.PROPERTY_COLUMNS, ids);
80 }
81
82
83
86 public void dispose() {
87 fListeners.clear();
88 fProperties.clear();
89 }
90
91
94 public void addPropertyChangeListener(IPropertyChangeListener listener) {
95 fListeners.add(listener);
96 }
97
98
101 public void removePropertyChangeListener(IPropertyChangeListener listener) {
102 fListeners.remove(listener);
103 }
104
105
108 public String getId() {
109 return fId;
110 }
111
112
115 public Object getProperty(String property) {
116 synchronized (fProperties) {
117 return fProperties.get(property);
118 }
119 }
120
121
124 public void setProperty(String property, Object value) {
125 synchronized (fProperties) {
126 Object oldValue = fProperties.get(property);
127 if (!isEqual(oldValue, value)) {
128 fProperties.put(property, value);
129 firePropertyChange(property, oldValue, value);
130 }
131 }
132 }
133
134 private boolean isEqual(Object a, Object b) {
135 if (a == null) {
136 return b == null;
137 }
138 return a.equals(b);
139 }
140
141
142 }
143 |
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