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32
33 package com.jeantessier.dependency;
34
35 import java.io.*;
36 import java.net.*;
37 import java.util.*;
38
39 import org.apache.log4j.*;
40
41 import org.xml.sax.*;
42 import org.xml.sax.helpers.*;
43
44 public class NodeLoader {
45 private static final String  DEFAULT_READER_CLASS_NAME = "org.apache.xerces.parsers.SAXParser";
46 private static final boolean DEFAULT_VALIDATE = false;
47
48 private NodeHandler handler;
49 private String readerClassName;
50 private boolean validate;
51
52 public NodeLoader() {
53 this(new NodeFactory(), DEFAULT_READER_CLASS_NAME, DEFAULT_VALIDATE);
54 }
55
56 public NodeLoader(NodeFactory factory) {
57 this(factory, DEFAULT_READER_CLASS_NAME, DEFAULT_VALIDATE);
58 }
59
60 public NodeLoader(String readerClassName) {
61 this(new NodeFactory(), readerClassName, DEFAULT_VALIDATE);
62 }
63
64 public NodeLoader(boolean validate) {
65 this(new NodeFactory(), DEFAULT_READER_CLASS_NAME, validate);
66 }
67
68 public NodeLoader(NodeFactory factory, String readerClassName) {
69 this(factory, readerClassName, DEFAULT_VALIDATE);
70 }
71
72 public NodeLoader(NodeFactory factory, boolean validate) {
73 this(factory, DEFAULT_READER_CLASS_NAME, validate);
74 }
75
76 public NodeLoader(String readerClassName, boolean validate) {
77 this(new NodeFactory(), readerClassName, validate);
78 }
79
80 public NodeLoader(NodeFactory factory, String readerClassName, boolean validate) {
81 this.handler = new NodeHandler(factory);
82 this.readerClassName = readerClassName;
83 this.validate = validate;
84 }
85
86 public NodeFactory load(String filename) throws IOException, SAXException {
87 NodeFactory result = null;
88
89 FileReader in = null;
90 try {
91 in = new FileReader(filename);
92 result = load(in);
93 } finally {
94 if (in != null) {
95 in.close();
96 }
97 }
98
99 return result;
100 }
101
102 public NodeFactory load(InputStream in) throws IOException, SAXException {
103 return load(new InputSource(in));
104 }
105
106 public NodeFactory load(Reader in) throws IOException, SAXException {
107 return load(new InputSource(in));
108 }
109
110 public NodeFactory load(InputSource in) throws IOException, SAXException {
111 XMLReader reader = XMLReaderFactory.createXMLReader(readerClassName);
112 reader.setDTDHandler(handler);
113 reader.setContentHandler(handler);
114 reader.setErrorHandler(handler);
115
116 try {
117 if (validate) {
118 Logger.getLogger(getClass()).warn("XML validation turned on");
119 reader.setFeature("http://xml.org/sax/features/validation", true);
120 reader.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", true);
121 } else {
122 Logger.getLogger(getClass()).info("XML validation turned off");
123 reader.setFeature("http://xml.org/sax/features/validation", false);
124 reader.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
125 }
126 } catch (Exception ex) {
127 Logger.getLogger(getClass()).warn("Problem setting validation feature on XML reader",ex);
128 }
129
130 reader.parse(in);
131
132 return handler.getFactory();
133 }
134
135 public void addDependencyListener(DependencyListener listener) {
136 handler.addDependencyListener(listener);
137 }
138
139 public void removeDependencyListener(DependencyListener listener) {
140 handler.removeDependencyListener(listener);
141 }
142 }
143 |
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