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1
11 package org.eclipse.help.internal;
12
13 import java.io.IOException  ;
14 import java.io.InputStream ;
15 import java.io.StringReader ;
16 import java.net.URL ;
17 import java.util.ArrayList ;
18 import java.util.HashSet ;
19 import java.util.List ;
20 import java.util.Set ;
21
22 import javax.xml.parsers.SAXParser ;
23 import javax.xml.parsers.SAXParserFactory ;
24
25 import org.eclipse.core.runtime.IProduct;
26 import org.eclipse.core.runtime.Platform;
27 import org.xml.sax.Attributes ;
28 import org.xml.sax.InputSource ;
29 import org.xml.sax.SAXException ;
30 import org.xml.sax.helpers.DefaultHandler ;
31
32
36 public class HelpData {
37
38 private static final String ELEMENT_TOC_ORDER = "tocOrder"; private static final String ELEMENT_HIDDEN = "hidden"; private static final String ELEMENT_TOC = "toc"; private static final String ELEMENT_CATEGORY = "category"; private static final String ELEMENT_INDEX = "index"; private static final String ATTRIBUTE_ID = "id";
45 private static HelpData productHelpData;
46
47 private URL url;
48 private List tocOrder;
49 private Set hiddenTocs;
50 private Set hiddenIndexes;
51
52
56 public static synchronized HelpData getProductHelpData() {
57 if (productHelpData == null) {
58 String helpDataFile = HelpPlugin.getDefault().getPluginPreferences().getString(HelpPlugin.HELP_DATA_KEY);
59 if (helpDataFile.length() != 0) {
60 IProduct product = Platform.getProduct();
61 if (product != null) {
62 URL url = product.getDefiningBundle().getEntry(helpDataFile);
63 productHelpData = new HelpData(url);
64 }
65 }
66 }
67 return productHelpData;
68 }
69
70
73 public HelpData(URL url) {
74 this.url = url;
75 }
76
77
81 public synchronized List getTocOrder() {
82 if (tocOrder == null) {
83 loadHelpData();
84 }
85 return tocOrder;
86 }
87
88
92 public synchronized Set getHiddenTocs() {
93 if (hiddenTocs == null) {
94 loadHelpData();
95 }
96 return hiddenTocs;
97 }
98
99
103 public synchronized Set getHiddenIndexes() {
104 if (hiddenIndexes == null) {
105 loadHelpData();
106 }
107 return hiddenIndexes;
108 }
109
110
113 public InputStream getHelpDataFile(String filePath) throws IOException {
114 return Platform.getProduct().getDefiningBundle().getEntry(filePath).openStream();
115 }
116
117
120 private void loadHelpData() {
121 tocOrder = new ArrayList ();
122 hiddenTocs = new HashSet ();
123 hiddenIndexes = new HashSet ();
124 if (url != null) {
125 try {
126 SAXParser parser = SAXParserFactory.newInstance().newSAXParser();
127 InputStream in = url.openStream();
128 parser.parse(in, new Handler ());
129 }
130 catch (Throwable t) {
131 String msg = "Error loading help data file \"" + url + "\""; HelpPlugin.logError(msg, t);
133 }
134 }
135 }
136
137
140 private class Handler extends DefaultHandler {
141
142 private boolean inTocOrder;
143 private boolean inHidden;
144
145
148 public void startElement(String uri, String localName, String name, Attributes attributes) throws SAXException {
149 if (ELEMENT_TOC_ORDER.equals(name)) {
150 inTocOrder = true;
151 }
152 else if (ELEMENT_HIDDEN.equals(name)) {
153 inHidden = true;
154 }
155 else if (ELEMENT_TOC.equals(name) || ELEMENT_CATEGORY.equals(name)) {
156 String id = attributes.getValue(ATTRIBUTE_ID);
157 if (id != null) {
158 if (inTocOrder) {
159 tocOrder.add(id);
160 }
161 else if (inHidden) {
162 hiddenTocs.add(id);
163 }
164 }
165 }
166 else if (ELEMENT_INDEX.equals(name) && inHidden) {
167 String id = attributes.getValue(ATTRIBUTE_ID);
168 if (id != null) {
169 hiddenIndexes.add(id);
170 }
171 }
172 }
173
174
177 public void endElement(String uri, String localName, String name) throws SAXException {
178 if (ELEMENT_TOC_ORDER.equals(name)) {
179 inTocOrder = false;
180 }
181 else if (ELEMENT_HIDDEN.equals(name)) {
182 inHidden = false;
183 }
184 }
185
186
192 public InputSource resolveEntity(String publicId, String systemId) throws SAXException {
193 return new InputSource (new StringReader ("")); }
195 }
196 }
197 |
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