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11 package org.eclipse.team.internal.core;
12
13 import java.util.HashMap  ;
14 import java.util.StringTokenizer ;
15
16 import org.eclipse.core.runtime.*;
17 import org.eclipse.core.runtime.content.IContentType;
18 import org.eclipse.osgi.util.NLS;
19 import org.eclipse.team.core.mapping.IStorageMerger;
20
21 public class StorageMergerRegistry {
22
23 private final static String ID_ATTRIBUTE = "id"; private final static String EXTENSIONS_ATTRIBUTE = "extensions"; private final static String CONTENT_TYPE_ID_ATTRIBUTE = "contentTypeId"; private static final String STORAGE_MERGER_EXTENSION_POINT = "storageMergers"; private static final Object STORAGE_MERGER = "storageMerger"; private static final String CONTENT_TYPE_BINDING= "contentTypeBinding"; private static final String STORAGE_MERGER_ID_ATTRIBUTE= "storageMergerId";
31 private static boolean NORMALIZE_CASE= true;
32
33 private static StorageMergerRegistry instance;
34
35 private HashMap fIdMap; private HashMap fExtensionMap; private HashMap fContentTypeBindings; private boolean fRegistriesInitialized;
39
40 public static StorageMergerRegistry getInstance() {
41 if (instance == null) {
42 instance = new StorageMergerRegistry();
43 }
44 return instance;
45 }
46
47
54 public IStorageMerger createStreamMerger(String type) {
55 initializeRegistry();
56 StorageMergerDescriptor descriptor= (StorageMergerDescriptor) search(type);
57 if (descriptor != null)
58 return descriptor.createStreamMerger();
59 return null;
60 }
61
62
69 public IStorageMerger createStreamMerger(IContentType type) {
70 initializeRegistry();
71 StorageMergerDescriptor descriptor= (StorageMergerDescriptor) search(type);
72 if (descriptor != null)
73 return descriptor.createStreamMerger();
74 return null;
75 }
76
77 private void initializeRegistry() {
78 if (!fRegistriesInitialized) {
79 registerExtensions();
80 fRegistriesInitialized= true;
81 }
82 }
83
84
88 private void registerExtensions() {
89 IExtensionRegistry registry= Platform.getExtensionRegistry();
90
91 IConfigurationElement[] elements= registry.getConfigurationElementsFor(TeamPlugin.ID, STORAGE_MERGER_EXTENSION_POINT);
93 for (int i= 0; i < elements.length; i++) {
94 IConfigurationElement element= elements[i];
95 if (STORAGE_MERGER.equals(element.getName()))
96 register(element, new StorageMergerDescriptor(element));
97 else if (CONTENT_TYPE_BINDING.equals(element.getName()))
98 createBinding(element, STORAGE_MERGER_ID_ATTRIBUTE);
99 }
100 }
101
102 private static String normalizeCase(String s) {
103 if (NORMALIZE_CASE && s != null)
104 return s.toUpperCase();
105 return s;
106 }
107
108 void register(IConfigurationElement element, Object data) {
109 String id = element.getAttribute(ID_ATTRIBUTE);
110 if (id != null) {
111 if (fIdMap == null)
112 fIdMap = new HashMap ();
113 fIdMap.put(id, data);
114 }
115
116 String types = element.getAttribute(EXTENSIONS_ATTRIBUTE);
117 if (types != null) {
118 if (fExtensionMap == null)
119 fExtensionMap = new HashMap ();
120 StringTokenizer tokenizer = new StringTokenizer (types, ","); while (tokenizer.hasMoreElements()) {
122 String extension = tokenizer.nextToken().trim();
123 fExtensionMap.put(normalizeCase(extension), data);
124 }
125 }
126 }
127
128 void createBinding(IConfigurationElement element, String idAttributeName) {
129 String type = element.getAttribute(CONTENT_TYPE_ID_ATTRIBUTE);
130 String id = element.getAttribute(idAttributeName);
131 if (id == null)
132 logErrorMessage(NLS.bind("Target attribute id '{0}' missing", idAttributeName)); if (type != null && id != null && fIdMap != null) {
134 Object o = fIdMap.get(id);
135 if (o != null) {
136 IContentType ct = Platform.getContentTypeManager().getContentType(type);
137 if (ct != null) {
138 if (fContentTypeBindings == null)
139 fContentTypeBindings = new HashMap ();
140 fContentTypeBindings.put(ct, o);
141 } else {
142 logErrorMessage(NLS.bind("Content type id '{0}' not found", type)); }
144 } else {
145 logErrorMessage(NLS.bind("Target '{0}' not found", id)); }
147 }
148 }
149
150 private void logErrorMessage(String string) {
151 TeamPlugin.log(IStatus.ERROR, string, null);
152 }
153
154 Object search(IContentType type) {
155 if (fContentTypeBindings != null) {
156 for (; type != null; type = type.getBaseType()) {
157 Object data = fContentTypeBindings.get(type);
158 if (data != null)
159 return data;
160 }
161 }
162 return null;
163 }
164
165 Object search(String extension) {
166 if (fExtensionMap != null)
167 return fExtensionMap.get(normalizeCase(extension));
168 return null;
169 }
170 }
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