blob: 4012a7b5b44cdff96354e3f5ca6b4fc12a46d544 (
plain) (
blame)
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
|
/***************************************************************************************************
* Copyright (c) 2003, 2006 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.wst.common.internal.emf.utilities;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.wst.common.internal.emf.resource.Translator;
import org.eclipse.wst.common.internal.emf.utilities.TranslatorManager.TranslatorDescriptor;
/**
* This is the service class to deliver API to use to retrieve Translator extensions from
* the TranslatorManager and its RegistryReader.
*/
public class TranslatorService {
/**
* Static Key value pair of descriptors as keys and Translator instances as values
*/
private static final Map translators = new HashMap();
/**
* Static empty array used when no extensions found
*/
// never used
//private static final Translator[] NO_TRANSLATORS = new Translator[0];
/**
* Singleton instance of the Translator service
*/
private static final TranslatorService INSTANCE = new TranslatorService();
/**
* Default constructor
*/
private TranslatorService() {
super();
}
public static TranslatorService getInstance() {
return INSTANCE;
}
/**
* This will return the associated extension point TranslatorDescriptor objects from the manager
* @return TranslatorDescriptor[]
*/
public TranslatorDescriptor[] getTranslatorDescriptors() {
return TranslatorManager.getInstance().findTranslators();
}
/**
* This retrieves the extended Translators using the extension point manager and descriptors
* @return Translator[] (Note, the return value may contain null entries.)
*/
public Translator[] getTranslators() {
TranslatorDescriptor[] descriptors = getTranslatorDescriptors();
Translator[] result = new Translator[descriptors.length];
//The result index could differ from the descriptors index.
int resultIndex = 0;
for (int i=0; i<descriptors.length; i++) {
Translator instance = getTranslator(descriptors[i]);
if (instance!=null) {
result[resultIndex] = instance;
resultIndex++;
}
}
return result;
}
/**
* Retrieve the existing associated Translator instance for the descriptor, or create a new
* one and cache on the Set.
*
* @param translatorDescriptor
* @return Translator associated with the descriptor
*/
public Translator getTranslator(TranslatorDescriptor translatorDescriptor) {
Translator translator = (Translator) translators.get(translatorDescriptor);
if (translator != null)
return translator;
synchronized (translators) {
translator = translatorDescriptor.createTranslator();
if (translator != null)
translators.put(translatorDescriptor, translator);
}
return translator;
}
}
|
