1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
/*******************************************************************************
* Copyright (c) 2009, 2010 Tasktop Technologies and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Tasktop Technologies - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.p2.discovery.compatibility;
import java.io.IOException;
import java.io.Reader;
import org.eclipse.equinox.internal.p2.discovery.compatibility.Directory.Entry;
import org.eclipse.equinox.internal.p2.discovery.compatibility.util.DefaultSaxErrorHandler;
import org.eclipse.equinox.internal.p2.discovery.compatibility.util.IOWithCauseException;
import org.eclipse.osgi.util.NLS;
import org.xml.sax.*;
import org.xml.sax.helpers.XMLReaderFactory;
/**
* A parser for {@link Directory directories}.
*
* @author David Green
*/
public class DirectoryParser {
/**
* parse the contents of a directory. The caller must close the given reader.
*
* @param directoryContents
* the contents of the directory
* @return a directory with 0 or more entries
* @throws IOException
* if the directory cannot be read.
*/
public Directory parse(Reader directoryContents) throws IOException {
XMLReader xmlReader;
try {
xmlReader = XMLReaderFactory.createXMLReader();
} catch (SAXException e) {
throw new IOWithCauseException(e.getMessage(), e);
}
xmlReader.setErrorHandler(new DefaultSaxErrorHandler());
DirectoryContentHandler contentHandler = new DirectoryContentHandler();
xmlReader.setContentHandler(contentHandler);
try {
xmlReader.parse(new InputSource(directoryContents));
} catch (SAXException e) {
throw new IOWithCauseException(e.getMessage(), e);
}
if (contentHandler.directory == null) {
throw new IOException(Messages.DirectoryParser_no_directory);
}
return contentHandler.directory;
}
@SuppressWarnings("unused")
private class DirectoryContentHandler implements ContentHandler {
Directory directory;
public void characters(char[] ch, int start, int length) throws SAXException {
// ignore
}
/**
* @throws SAXException
*/
public void endDocument() throws SAXException {
// ignore
}
public void endElement(String uri, String localName, String qName) throws SAXException {
// ignore
}
public void endPrefixMapping(String prefix) throws SAXException {
// ignore
}
public void ignorableWhitespace(char[] ch, int start, int length) throws SAXException {
// ignore
}
public void processingInstruction(String target, String data) throws SAXException {
// ignore
}
public void setDocumentLocator(Locator locator) {
// ignore
}
public void skippedEntity(String name) throws SAXException {
// ignore
}
public void startDocument() throws SAXException {
// ignore
}
public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException {
if ("directory".equals(localName)) { //$NON-NLS-1$
if (directory != null) {
unexpectedElement(localName);
}
directory = new Directory();
} else if (directory != null && "entry".equals(localName)) { //$NON-NLS-1$
String url = atts.getValue("", "url"); //$NON-NLS-1$ //$NON-NLS-2$
if (url != null && url.length() > 0) {
Entry entry = new Entry();
entry.setLocation(url);
entry.setPermitCategories(Boolean.parseBoolean(atts.getValue("permitCategories"))); //$NON-NLS-1$
directory.getEntries().add(entry);
}
}
// else ignore
}
private void unexpectedElement(String localName) throws SAXException {
throw new SAXException(NLS.bind(Messages.DirectoryParser_unexpected_element, localName));
}
public void startPrefixMapping(String prefix, String uri) throws SAXException {
// ignore
}
}
}
|
