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1
11 package org.eclipse.ui.internal.texteditor.rulers;
12
13 import java.net.URL  ;
14
15 import org.osgi.framework.Bundle;
16
17 import com.ibm.icu.text.MessageFormat;
18
19 import org.eclipse.core.runtime.Assert;
20 import org.eclipse.core.runtime.FileLocator;
21 import org.eclipse.core.runtime.IConfigurationElement;
22 import org.eclipse.core.runtime.IExtension;
23 import org.eclipse.core.runtime.ILog;
24 import org.eclipse.core.runtime.IStatus;
25 import org.eclipse.core.runtime.InvalidRegistryObjectException;
26 import org.eclipse.core.runtime.Path;
27 import org.eclipse.core.runtime.Platform;
28 import org.eclipse.core.runtime.Status;
29
30 import org.eclipse.ui.internal.texteditor.TextEditorPlugin;
31
32 public final class ExtensionPointHelper {
33
34 private final IConfigurationElement fElement;
35 private final String fName;
36 private final ILog fLog;
37
38 public ExtensionPointHelper(IConfigurationElement element, ILog log) throws InvalidRegistryObjectException {
39 Assert.isLegal(element != null);
40 Assert.isLegal(log != null);
41 fLog= log;
42 fElement= element;
43 fName= element.getName();
44 }
46
47 public String getDefaultAttribute(String attribute, String dflt) throws InvalidRegistryObjectException {
48 String value= fElement.getAttribute(attribute);
49 return value == null ? dflt : value;
50 }
51
52 public String getNonNullAttribute(String attribute) throws InvalidRegistryObjectException {
53 String value= fElement.getAttribute(attribute);
54 if (value == null)
55 fail(MessageFormat.format(RulerColumnMessages.ExtensionPointHelper_missing_attribute_msg, new Object [] {fName, attribute}));
56 return value;
57 }
58
59 public float getDefaultAttribute(String attribute, float dflt) {
60 String value= getDefaultAttribute(attribute, null);
61 if (value == null)
62 return dflt;
63
64 try {
65 return Float.valueOf(value).floatValue();
66 } catch (NumberFormatException x) {
67 fail(MessageFormat.format(RulerColumnMessages.ExtensionPointHelper_invalid_number_attribute_msg, new Object [] {attribute, fName}));
68 return dflt;
69 }
70 }
71
72 public boolean getDefaultAttribute(String attribute, boolean dflt) {
73 String value= getDefaultAttribute(attribute, null);
74 if (value == null)
75 return dflt;
76
77 try {
78 return Boolean.valueOf(value).booleanValue();
79 } catch (NumberFormatException x) {
80 fail(MessageFormat.format(RulerColumnMessages.ExtensionPointHelper_invalid_number_attribute_msg, new Object [] {fName, attribute}));
81 return dflt;
82 }
83 }
84
85 public void fail(String message) throws InvalidRegistryObjectException {
86 String id= findId(fElement);
87 String extensionPointId= fElement.getDeclaringExtension().getExtensionPointUniqueIdentifier();
88 Object [] args= { fElement.getContributor().getName(), id, extensionPointId };
89 String blame= MessageFormat.format(RulerColumnMessages.ExtensionPointHelper_invalid_contribution_msg, args);
90
91 IStatus status= new Status(IStatus.WARNING, TextEditorPlugin.PLUGIN_ID, IStatus.OK, blame + message, null);
92 fLog.log(status);
93 throw new InvalidRegistryObjectException();
94 }
95
96 public static String findId(IConfigurationElement element) {
97 String id= null;
98 while (element != null && id == null) {
99 id= element.getAttribute("id"); if (id != null)
101 break;
102 Object parent= element.getParent();
103 if (parent instanceof IExtension) {
104 id= ((IExtension) parent).getUniqueIdentifier();
105 break;
106 } else if (parent instanceof IConfigurationElement) {
107 element= (IConfigurationElement) parent;
108 } else {
109 break;
110 }
111 }
112 return id == null ? "<unknown>" : id; }
114
115 public URL getDefaultResourceURL(String attribute, URL dflt) {
116 String value= getDefaultAttribute(attribute, null);
117 if (value == null)
118 return dflt;
119
120 Bundle bundle= getBundle();
121 if (bundle == null)
122 return dflt;
123
124 Path path= new Path(value);
125 return FileLocator.find(bundle, path, null);
126 }
127
128 private Bundle getBundle() {
129 String namespace= fElement.getDeclaringExtension().getContributor().getName();
130 Bundle bundle= Platform.getBundle(namespace);
131 return bundle;
132 }
133 }
134 |
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