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1
7
8 package org.dom4j.io;
9
10 import org.xml.sax.SAXException  ;
11 import org.xml.sax.SAXNotRecognizedException ;
12 import org.xml.sax.SAXNotSupportedException ;
13 import org.xml.sax.XMLReader ;
14 import org.xml.sax.helpers.XMLReaderFactory ;
15
16
25 class SAXHelper {
26 private static boolean loggedWarning = true;
27
28 protected SAXHelper() {
29 }
30
31 public static boolean setParserProperty(XMLReader reader,
32 String propertyName, Object value) {
33 try {
34 reader.setProperty(propertyName, value);
35
36 return true;
37 } catch (SAXNotSupportedException e) {
38 } catch (SAXNotRecognizedException e) {
40 }
42
43 return false;
44 }
45
46 public static boolean setParserFeature(XMLReader reader,
47 String featureName, boolean value) {
48 try {
49 reader.setFeature(featureName, value);
50
51 return true;
52 } catch (SAXNotSupportedException e) {
53 } catch (SAXNotRecognizedException e) {
55 }
57
58 return false;
59 }
60
61
73 public static XMLReader createXMLReader(boolean validating)
74 throws SAXException {
75 XMLReader reader = null;
76
77 if (reader == null) {
78 reader = createXMLReaderViaJAXP(validating, true);
79 }
80
81 if (reader == null) {
82 try {
83 reader = XMLReaderFactory.createXMLReader();
84 } catch (Exception e) {
85 if (isVerboseErrorReporting()) {
86 System.out.println("Warning: Caught exception attempting "
89 + "to use SAX to load a SAX XMLReader ");
90 System.out.println("Warning: Exception was: " + e);
91 System.out
92 .println("Warning: I will print the stack trace "
93 + "then carry on using the default "
94 + "SAX parser");
95 e.printStackTrace();
96 }
97
98 throw new SAXException (e);
99 }
100 }
101
102 if (reader == null) {
103 throw new SAXException ("Couldn't create SAX reader");
104 }
105
106 return reader;
107 }
108
109
121 protected static XMLReader createXMLReaderViaJAXP(boolean validating,
122 boolean namespaceAware) {
123 try {
125 return JAXPHelper.createXMLReader(validating, namespaceAware);
126 } catch (Throwable e) {
127 if (!loggedWarning) {
128 loggedWarning = true;
129
130 if (isVerboseErrorReporting()) {
131 System.out.println("Warning: Caught exception attempting "
134 + "to use JAXP to load a SAX XMLReader");
135 System.out.println("Warning: Exception was: " + e);
136 e.printStackTrace();
137 }
138 }
139 }
140
141 return null;
142 }
143
144 protected static boolean isVerboseErrorReporting() {
145 try {
146 String flag = System.getProperty("org.dom4j.verbose");
147
148 if ((flag != null) && flag.equalsIgnoreCase("true")) {
149 return true;
150 }
151 } catch (Exception e) {
152 }
155
156 return true;
157 }
158 }
159
160
196 |
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