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11 package org.eclipse.core.internal.resources.mapping;
12
13 import java.util.*;
14 import org.eclipse.core.expressions.*;
15 import org.eclipse.core.internal.resources.ResourceException;
16 import org.eclipse.core.internal.utils.Messages;
17 import org.eclipse.core.resources.IResource;
18 import org.eclipse.core.resources.ResourcesPlugin;
19 import org.eclipse.core.resources.mapping.*;
20 import org.eclipse.core.runtime.*;
21 import org.eclipse.osgi.util.NLS;
22
23 public class ModelProviderDescriptor implements IModelProviderDescriptor {
24
25 private String  id;
26 private String [] extendedModels;
27 private String label;
28 private ModelProvider provider;
29 private Expression enablementRule;
30
31 private static EvaluationContext createEvaluationContext(Object element) {
32 EvaluationContext result = new EvaluationContext(null, element);
33 return result;
34 }
35
36 public ModelProviderDescriptor(IExtension extension) throws CoreException {
37 readExtension(extension);
38 }
39
40 private boolean convert(EvaluationResult eval) {
41 if (eval == EvaluationResult.FALSE)
42 return false;
43 return true;
44 }
45
46 protected void fail(String reason) throws CoreException {
47 throw new ResourceException(new Status(IStatus.ERROR, ResourcesPlugin.PI_RESOURCES, 1, reason, null));
48 }
49
50 public String [] getExtendedModels() {
51 return extendedModels;
52 }
53
54 public String getId() {
55 return id;
56 }
57
58 public String getLabel() {
59 return label;
60 }
61
62 public IResource[] getMatchingResources(IResource[] resources) throws CoreException {
63 Set result = new HashSet();
64 for (int i = 0; i < resources.length; i++) {
65 IResource resource = resources[i];
66 EvaluationContext evalContext = createEvaluationContext(resource);
67 if (matches(evalContext)) {
68 result.add(resource);
69 }
70 }
71 return (IResource[]) result.toArray(new IResource[result.size()]);
72 }
73
74 public synchronized ModelProvider getModelProvider() throws CoreException {
75 if (provider == null) {
76 IExtension extension = Platform.getExtensionRegistry().getExtension(ResourcesPlugin.PI_RESOURCES, ResourcesPlugin.PT_MODEL_PROVIDERS, id);
77 IConfigurationElement[] elements = extension.getConfigurationElements();
78 for (int i = 0; i < elements.length; i++) {
79 IConfigurationElement element = elements[i];
80 if (element.getName().equalsIgnoreCase("modelProvider")) { try {
82 provider = (ModelProvider) element.createExecutableExtension("class"); provider.init(this);
84 } catch (ClassCastException e) {
85 String message = NLS.bind(Messages.mapping_wrongType, id);
86 throw new CoreException(new Status(IStatus.ERROR, ResourcesPlugin.PI_RESOURCES, Platform.PLUGIN_ERROR, message, e));
87 }
88 }
89 }
90 }
91 return provider;
92 }
93
94 public boolean matches(IEvaluationContext context) throws CoreException {
95 if (enablementRule == null)
96 return false;
97 return convert(enablementRule.evaluate(context));
98 }
99
100
103 protected void readExtension(IExtension extension) throws CoreException {
104 id = extension.getUniqueIdentifier();
106 if (id == null)
107 fail(Messages.mapping_noIdentifier);
108 label = extension.getLabel();
109 IConfigurationElement[] elements = extension.getConfigurationElements();
110 int count = elements.length;
111 ArrayList extendsList = new ArrayList(count);
112 for (int i = 0; i < count; i++) {
113 IConfigurationElement element = elements[i];
114 String name = element.getName();
115 if (name.equalsIgnoreCase("extends-model")) { String attribute = element.getAttribute("id"); if (attribute == null)
118 fail(NLS.bind(Messages.mapping_invalidDef, id));
119 extendsList.add(attribute);
120 } else if (name.equalsIgnoreCase(ExpressionTagNames.ENABLEMENT)) {
121 enablementRule = ExpressionConverter.getDefault().perform(element);
122 }
123 }
124 extendedModels = (String []) extendsList.toArray(new String [extendsList.size()]);
125 }
126
127 public ResourceTraversal[] getMatchingTraversals(ResourceTraversal[] traversals) throws CoreException {
128 List result = new ArrayList();
129 for (int i = 0; i < traversals.length; i++) {
130 ResourceTraversal traversal = traversals[i];
131 if (getMatchingResources(traversal.getResources()).length > 0) {
132 result.add(traversal);
133 }
134 }
135 return (ResourceTraversal[]) result.toArray(new ResourceTraversal[result.size()]);
136 }
137
138 }
139 |
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