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
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
/*******************************************************************************
* Copyright (c) 2001, 2008 Oracle 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:
* Oracle Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.jsf.core.internal;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.content.IContentType;
import org.eclipse.jst.jsf.common.internal.policy.CanonicallyOrderedIteratorPolicy;
import org.eclipse.jst.jsf.common.internal.policy.IIteratorPolicy;
import org.eclipse.jst.jsf.common.internal.strategy.IIdentifiableStrategy;
import org.eclipse.jst.jsf.common.internal.strategy.IteratorPolicyBasedStrategyComposite;
import org.eclipse.jst.jsf.designtime.internal.view.model.ITagRegistry;
import org.eclipse.jst.jsf.designtime.internal.view.model.TagRegistryFactory.TagRegistryFactoryException;
/**
* Employs a policy-based strategy to construct a TagRegistry for a particular
* content-type in a particular project.
*
* @author cbateman
*
*/
public final class CompositeTagRegistryFactory
{
private static CompositeTagRegistryFactory INSTANCE;
/**
* @return the single instance of the registry factory
*/
public static synchronized CompositeTagRegistryFactory getInstance()
{
if (INSTANCE == null)
{
INSTANCE = new CompositeTagRegistryFactory();
}
return INSTANCE;
}
private final Map<IContentType, Set<TagRegistryFactoryInfo>> _cachedExtensionsByType =
new HashMap<IContentType, Set<TagRegistryFactoryInfo>>(4);
private CompositeTagRegistryFactory()
{
// singleton: no external instantiation
}
/**
* @param id
* @return a tag registry for the id or null if there isn't one.
*/
public final ITagRegistry getRegistry(final TagRegistryIdentifier id)
{
final Set<TagRegistryFactoryInfo> handlers = TagLibraryRegistryLoader
.getAllHandlers();
final Set<TagRegistryFactoryInfo> matchingHandlers = findMatchingExtensions(
id, handlers);
if (matchingHandlers.size() > 0)
{
// optimize: if there is only one handler, no need for strategy
if (matchingHandlers.size() == 1)
{
try
{
return matchingHandlers.iterator().next().getTagRegistryFactory()
.createTagRegistry(id.getProject());
}
catch (TagRegistryFactoryException e)
{
JSFCorePlugin.log(e, "While trying to acquire a registry"); //$NON-NLS-1$
}
}
else
{
// for now, we will order by the canonical name of the extension
// id in ascending order. Later, we may make this preference
// based.
final TagRegistrySelectionStrategy selectionStrategy = new TagRegistrySelectionStrategy(
new CanonicallyOrderedIteratorPolicy<String>());
for (final Iterator<TagRegistryFactoryInfo> it = matchingHandlers
.iterator(); it.hasNext();)
{
selectionStrategy.addStrategy(it.next().getTagRegistryFactory());
}
return selectionStrategy.perform(id.getProject());
}
}
return null;
}
/**
* @return get all tag registry factories
*/
public Set<TagRegistryFactoryInfo> getAllTagRegistryFactories()
{
return TagLibraryRegistryLoader.getAllHandlers();
}
private Set<TagRegistryFactoryInfo> findMatchingExtensions(
TagRegistryIdentifier id, Set<TagRegistryFactoryInfo> handlers)
{
Set<TagRegistryFactoryInfo> matching = _cachedExtensionsByType.get(id
.getContentType());
if (matching == null)
{
matching = new HashSet<TagRegistryFactoryInfo>(4);
for (final TagRegistryFactoryInfo handler : handlers)
{
if (handler.getContentTypes().contains(id.getContentType()))
{
matching.add(handler);
}
}
// if there is nothing matching, just store the empty set and
// discard
// the extra memory
if (matching.size() > 0)
{
_cachedExtensionsByType.put(id.getContentType(), matching);
}
else
{
_cachedExtensionsByType.put(id.getContentType(),
Collections.EMPTY_SET);
}
}
return matching;
}
/**
* Identifies a content type/project context in which to request a tag
* registry.
*
* @author cbateman
*
*/
public final static class TagRegistryIdentifier
{
private final IProject _project;
private final IContentType _contentType;
/**
* @param project
* @param contentType
*/
public TagRegistryIdentifier(final IProject project,
final IContentType contentType)
{
_project = project;
_contentType = contentType;
}
/**
* @return project
*/
public IProject getProject()
{
return _project;
}
/**
* @return content type
*/
public IContentType getContentType()
{
return _contentType;
}
public boolean equals(final Object o) {
if (o instanceof TagRegistryIdentifier) {
final TagRegistryIdentifier other = (TagRegistryIdentifier)o;
final int otherProjectHash = other.getProject() != null ? other.getProject().hashCode() : 0;
final int thisProjectHash = getProject() != null ? getProject().hashCode() : 0;
if (otherProjectHash == thisProjectHash &&
other.getContentType().equals(this.getContentType()))
return true;
}
return false;
}
public int hashCode() {
return (getProject() != null ? getProject().hashCode() : 0) + 7*_contentType.hashCode();
}
}
private static class TagRegistrySelectionStrategy
extends
IteratorPolicyBasedStrategyComposite<IProject, ITagRegistry, ITagRegistry, String, IIdentifiableStrategy<IProject, ITagRegistry, String>>
{
private static final ITagRegistry NO_RESULT = null;
protected TagRegistrySelectionStrategy(IIteratorPolicy<String> policy)
{
super(policy);
}
@Override
public ITagRegistry getNoResult()
{
return NO_RESULT;
}
}
}
|
