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1
21
22 package nu.xom.samples;
23
24 import java.io.IOException  ;
25 import java.util.Stack ;
26
27 import nu.xom.Attribute;
28 import nu.xom.Builder;
29 import nu.xom.DocType;
30 import nu.xom.Document;
31 import nu.xom.Element;
32 import nu.xom.NodeFactory;
33 import nu.xom.Nodes;
34 import nu.xom.ParsingException;
35 import nu.xom.Serializer;
36
37
58
59 public class StreamingXHTMLPurifier extends NodeFactory {
60
61 private Stack namespaces = new Stack ();
62 private Nodes empty = new Nodes();
63 public final static String XHTML_NAMESPACE
64 = "http://www.w3.org/1999/xhtml";
65
66 public Nodes makeText(String data) {
68 if (inXHTML()) return super.makeText(data);
69 return empty;
70 }
71
72 public Nodes makeComment(String data) {
73 if (inXHTML()) return super.makeComment(data);
74 return empty;
75 }
76
77
78 private boolean inXHTML() {
79 if (namespaces.isEmpty()) return true; String currentNamespace = (String ) (namespaces.peek());
81 if (XHTML_NAMESPACE.equals(currentNamespace)) return true;
82 return false;
83 }
84
85 public Element startMakingElement(String name, String namespace) {
86
87 namespaces.push(namespace);
88 if (XHTML_NAMESPACE.equals(namespace)) {
89 return super.startMakingElement(name, namespace);
90 }
91 return null;
92 }
93
94 public Nodes finishMakingElement(Element element) {
95 namespaces.pop();
96 int namespaceCount = element.getNamespaceDeclarationCount();
97 for (int i = 0; i < namespaceCount; i++) {
98 String prefix = element.getNamespacePrefix(i);
99 element.removeNamespaceDeclaration(prefix);
100 if (element.getNamespaceDeclarationCount() < namespaceCount) {
101 i--;
102 namespaceCount--;
103 }
104 }
105 return new Nodes(element);
106 }
107
108 public Nodes makeDocType(String rootElementName,
109 String publicID, String systemID) {
110 return new Nodes(new DocType("html",
111 "PUBLIC \"-//W3C//DTD XHTML Basic 1.0//EN\"",
112 "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd"));
113 }
114
115 public Nodes makeProcessingInstruction(
116 String target, String data) {
117 if (inXHTML()) {
118 return super.makeProcessingInstruction(target, data);
119 }
120 return empty;
121 }
122
123 public Nodes makeAttribute(String name, String URI,
124 String value, Attribute.Type type) {
125 if ("".equals(URI)
126 || "http://www.w3.org/XML/1998/namespace".equals(URI)) {
127 return super.makeAttribute(name, URI, value, type);
128 }
129 return empty;
130 }
131
132 public static void main(String [] args) {
133
134 if (args.length == 0) {
135 System.out.println(
136 "Usage: java nu.xom.samples.StreamingXHTMLPurifier URL"
137 );
138 return;
139 }
140
141 StreamingXHTMLPurifier factory = new StreamingXHTMLPurifier();
142 Builder builder = new Builder(factory);
143
144 try {
145 Document doc = builder.build(args[0]);
146 Serializer serializer = new Serializer(System.out);
147 serializer.write(doc);
148 }
149 catch (ParsingException ex) {
151 System.out.println(args[0] + " is not well-formed.");
152 System.out.println(ex.getMessage());
153 ex.printStackTrace();
154 }
155 catch (IOException ex) {
156 System.out.println(ex);
157 }
158
159 }
160
161 }
162 |
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