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1
21
22 package nu.xom.samples;
23
24 import java.io.IOException  ;
25 import java.io.OutputStreamWriter ;
26 import java.io.Writer ;
27
28 import nu.xom.Attribute;
29 import nu.xom.Builder;
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
36
37
47 public class StreamingTextExtractor extends NodeFactory {
48
49 private Writer out;
50 private Nodes empty = new Nodes();
51
52 public StreamingTextExtractor(Writer out) {
53 if (out == null) {
54 throw new NullPointerException ("Writer must be non-null.");
55 }
56 this.out = out;
57 }
58
59 public StreamingTextExtractor() {
60 this(new OutputStreamWriter (System.out));
61 }
62
63 public Nodes makeComment(String data) {
64 return empty;
65 }
66
67 public Nodes makeText(String data) {
68 try {
69 out.write(data);
70 }
71 catch (IOException ex) {
72 System.err.println(ex);
73 }
74 return empty;
75 }
76
77 public Element makeRootElement(String name, String namespace) {
78 Element result = new Element(name, namespace);
79 return result;
80 }
81
82 public Element startMakingElement(String name, String namespace) {
83 return null;
84 }
85
86 public Nodes makeAttribute(String name, String namespace,
87 String value, Attribute.Type type) {
88 return empty;
89 }
90
91 public Nodes makeDocType(String rootElementName,
92 String publicID, String systemID) {
93 return empty;
94 }
95
96 public Nodes makeProcessingInstruction(
97 String target, String data) {
98 return empty;
99 }
100
101 public void finishMakingDocument(Document doc) {
102 try {
103 out.flush();
104 }
105 catch (IOException ex) {
106 System.err.println(ex);
107 }
108 }
109
110 public static void main(String [] args) {
111
112 if (args.length <= 0) {
113 System.out.println(
114 "Usage: java nu.xom.samples.StreamingTextExtractor URL"
115 );
116 return;
117 }
118
119 try {
120 Builder parser = new Builder(new StreamingTextExtractor());
121 parser.build(args[0]);
122 }
123 catch (ParsingException ex) {
124 System.out.println(args[0] + " is not well-formed.");
125 System.out.println(ex.getMessage());
126 }
127 catch (IOException ex) {
128 System.out.println(
129 "Due to an IOException, the parser could not read "
130 + args[0]
131 );
132 }
133
134 }
135
136 }
137 |
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