1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
/*******************************************************************************
* Copyright (c) 2010, 2012 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.e4.core.di.internal.extensions;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.core.runtime.preferences.IEclipsePreferences;
import org.eclipse.core.runtime.preferences.IEclipsePreferences.IPreferenceChangeListener;
import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent;
import org.eclipse.core.runtime.preferences.IPreferencesService;
import org.eclipse.core.runtime.preferences.InstanceScope;
import org.eclipse.e4.core.di.IInjector;
import org.eclipse.e4.core.di.extensions.Preference;
import org.eclipse.e4.core.di.suppliers.ExtendedObjectSupplier;
import org.eclipse.e4.core.di.suppliers.IObjectDescriptor;
import org.eclipse.e4.core.di.suppliers.IRequestor;
import org.osgi.framework.FrameworkUtil;
/**
* Note: we do not support byte arrays in preferences at this time.
*/
public class PreferencesObjectSupplier extends ExtendedObjectSupplier {
static private class PrefInjectionListener implements IPreferenceChangeListener {
final private IRequestor requestor;
final private IEclipsePreferences node;
public PrefInjectionListener(IEclipsePreferences node, IRequestor requestor) {
this.node = node;
this.requestor = requestor;
}
public void preferenceChange(PreferenceChangeEvent event) {
if (!requestor.isValid()) {
node.removePreferenceChangeListener(this);
return;
}
requestor.resolveArguments(false);
requestor.execute();
}
public IRequestor getRequestor() {
return requestor;
}
public void stopListening() {
node.removePreferenceChangeListener(this);
}
}
private Map<String, List<PrefInjectionListener>> listenerCache = new HashMap<String, List<PrefInjectionListener>>();
public PreferencesObjectSupplier() {
DIEActivator.getDefault().registerPreferencesSupplier(this);
}
@Override
public Object get(IObjectDescriptor descriptor, IRequestor requestor, boolean track, boolean group) {
if (descriptor == null)
return null;
Class<?> descriptorsClass = getDesiredClass(descriptor.getDesiredType());
String nodePath = getNodePath(descriptor, requestor.getRequestingObjectClass());
if (IEclipsePreferences.class.equals(descriptorsClass)) {
return InstanceScope.INSTANCE.getNode(nodePath);
}
String key = getKey(descriptor);
if (key == null || nodePath == null || key.length() == 0 || nodePath.length() == 0)
return IInjector.NOT_A_VALUE;
if (track)
addListener(nodePath, requestor);
if (descriptorsClass.isPrimitive()) {
if (descriptorsClass.equals(boolean.class))
return getPreferencesService().getBoolean(nodePath, key, false, null);
else if (descriptorsClass.equals(int.class))
return getPreferencesService().getInt(nodePath, key, 0, null);
else if (descriptorsClass.equals(double.class))
return getPreferencesService().getDouble(nodePath, key, 0.0d, null);
else if (descriptorsClass.equals(float.class))
return getPreferencesService().getFloat(nodePath, key, 0.0f, null);
else if (descriptorsClass.equals(long.class))
return getPreferencesService().getLong(nodePath, key, 0L, null);
}
if (String.class.equals(descriptorsClass))
return getPreferencesService().getString(nodePath, key, null, null);
else if (Boolean.class.equals(descriptorsClass))
return getPreferencesService().getBoolean(nodePath, key, false, null);
else if (Boolean.class.equals(descriptorsClass))
return getPreferencesService().getBoolean(nodePath, key, false, null);
else if (Integer.class.equals(descriptorsClass))
return getPreferencesService().getInt(nodePath, key, 0, null);
else if (Double.class.equals(descriptorsClass))
return getPreferencesService().getDouble(nodePath, key, 0.0d, null);
else if (Float.class.equals(descriptorsClass))
return getPreferencesService().getFloat(nodePath, key, 0.0f, null);
else if (Long.class.equals(descriptorsClass))
return getPreferencesService().getLong(nodePath, key, 0L, null);
return getPreferencesService().getString(nodePath, key, null, null);
}
private Class<?> getDesiredClass(Type desiredType) {
if (desiredType instanceof Class<?>)
return (Class<?>) desiredType;
if (desiredType instanceof ParameterizedType) {
Type rawType = ((ParameterizedType) desiredType).getRawType();
if (rawType instanceof Class<?>)
return (Class<?>) rawType;
}
return null;
}
private String getKey(IObjectDescriptor descriptor) {
if (descriptor == null)
return null;
Preference qualifier = descriptor.getQualifier(Preference.class);
return qualifier.value();
}
private String getNodePath(IObjectDescriptor descriptor, Class<?> requestingObject) {
if (descriptor == null)
return null;
Preference qualifier = descriptor.getQualifier(Preference.class);
String nodePath = qualifier.nodePath();
if (nodePath == null || nodePath.length() == 0) {
if (requestingObject == null)
return null;
nodePath = FrameworkUtil.getBundle(requestingObject).getSymbolicName();
}
return nodePath;
}
private IPreferencesService getPreferencesService() {
return DIEActivator.getDefault().getPreferencesService();
}
private void addListener(String nodePath, final IRequestor requestor) {
if (requestor == null)
return;
synchronized (listenerCache) {
if (listenerCache.containsKey(nodePath)) {
for (PrefInjectionListener listener : listenerCache.get(nodePath)) {
IRequestor previousRequestor = listener.getRequestor();
if (previousRequestor.equals(requestor))
return; // avoid adding duplicate listeners
}
}
}
final IEclipsePreferences node = InstanceScope.INSTANCE.getNode(nodePath);
PrefInjectionListener listener = new PrefInjectionListener(node, requestor);
node.addPreferenceChangeListener(listener);
synchronized (listenerCache) {
if (listenerCache.containsKey(nodePath))
listenerCache.get(nodePath).add(listener);
else {
List<PrefInjectionListener> listeningRequestors = new ArrayList<PrefInjectionListener>();
listeningRequestors.add(listener);
listenerCache.put(nodePath, listeningRequestors);
}
}
}
public void removeAllListeners() {
synchronized (listenerCache) {
for (List<PrefInjectionListener> listeners : listenerCache.values()) {
if (listeners == null)
continue;
for (PrefInjectionListener listener : listeners) {
listener.stopListening();
}
}
listenerCache.clear();
}
}
}
|
