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1
4 package org.objectweb.carol.cmi.compiler;
5
6 import java.io.InputStream  ;
7 import java.io.StringWriter ;
8
9 import org.xml.sax.Attributes ;
10 import org.xml.sax.InputSource ;
11 import org.xml.sax.SAXException ;
12 import org.xml.sax.SAXParseException ;
13 import org.xml.sax.XMLReader ;
14 import org.xml.sax.helpers.DefaultHandler ;
15
16 public class XMLTree extends DefaultHandler {
17
18 private static final String DEFAULT_PARSER_NAME =
19 "org.apache.xerces.parsers.SAXParser";
20 private XMLElement root = new XMLElement(null, null, null);
21 private XMLElement cur = root;
22 private boolean chars = false;
23 private StringWriter str = new StringWriter ();
24
25
29 private void flushChars() {
30 if (!chars)
31 return;
32 cur.add(str.toString());
33 str.getBuffer().setLength(0);
34 chars = false;
35 }
36
37 public void startDocument() {
38 flushChars();
39 }
40
41 public void endDocument() throws SAXException {
42 flushChars();
43 if (cur != root)
44 throw new SAXException ("Unexpected end of document");
45 }
46
47 public void startElement(
48 String uri,
49 String name,
50 String qName,
51 Attributes attrs)
52 throws SAXException {
53 flushChars();
54 XMLElement e = new XMLElement(cur, name, attrs);
55 cur.add(e);
56 cur = e;
57 }
58
59 public void endElement(String uri, String name, String qName)
60 throws SAXException {
61 flushChars();
62 if (!name.equals(cur.name))
63 throw new SAXException ("endElement \"" + name + "\" not corresponding with the startElement \"" + cur.name + "\"");
64 cur = cur.parent;
65 if (cur == null)
66 throw new SAXException ("endElement \"" + name + "\" with no corresponding startElement");
67 }
68
69 public void characters(char ch[], int start, int length)
70 throws SAXException {
71 str.write(ch, start, length);
72 chars = true;
73 }
74
75 public void ignorableWhitespace(char ch[], int start, int length) {
76 flushChars();
77 }
78
79
83 public void warning(SAXParseException ex) {
84 System.err.println(
85 "[Warning] " + getLocationString(ex) + ": " + ex.getMessage());
86 }
87
88 public void error(SAXParseException ex) {
89 System.err.println(
90 "[Error] " + getLocationString(ex) + ": " + ex.getMessage());
91 }
92
93 public void fatalError(SAXParseException ex) throws SAXException {
94 System.err.println(
95 "[Fatal Error] " + getLocationString(ex) + ": " + ex.getMessage());
96 throw ex;
97 }
98
99 public static String getLocationString(SAXParseException ex) {
100 StringBuffer str = new StringBuffer ();
101 String systemId = ex.getSystemId();
102 if (systemId != null) {
103 int index = systemId.lastIndexOf('/');
104 if (index != -1)
105 systemId = systemId.substring(index + 1);
106 str.append(systemId);
107 }
108 str.append(':');
109 str.append(ex.getLineNumber());
110 str.append(':');
111 str.append(ex.getColumnNumber());
112
113 return str.toString();
114 }
115
116 public InputSource resolveEntity(String publicId, String systemId) {
117 try {
118 int limit = systemId.lastIndexOf('/');
119 if (limit < 0) {
120 return null;
121 }
122 String base = systemId.substring(limit + 1);
123 ClassLoader cl = Thread.currentThread().getContextClassLoader();
124 InputStream in =
125 cl.getResourceAsStream("org/objectweb/carol/cmi/compiler/dtd/" + base);
126 return new InputSource (in);
127 } catch (Throwable t) {
128 return null;
129 }
130 }
131
132 public static XMLElement read(String uri) throws Exception {
133 XMLTree t = new XMLTree();
134 XMLReader parser =
135 (XMLReader ) Class.forName(DEFAULT_PARSER_NAME).newInstance();
136 parser.setContentHandler(t);
137 parser.setErrorHandler(t);
138 parser.setEntityResolver(t);
139 parser.setFeature("http://xml.org/sax/features/validation", true);
140 parser.parse(uri);
141 return t.root;
142 }
143 }
144 |
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