|
1
7
8 package com.hp.hpl.jena.xmloutput.impl;
9
10 import com.hp.hpl.jena.rdf.model.impl.Util;
11 import com.hp.hpl.jena.rdf.model.*;
12 import com.hp.hpl.jena.vocabulary.RDF;
13 import com.hp.hpl.jena.vocabulary.RDFSyntax;
14
15 import java.io.PrintWriter  ;
16
17
22 public class Basic extends BaseXMLWriter {
23
24 static String RDFNS = RDF.getURI();
25
26 public Basic() {
27 }
28
29 private String space;
30
31 void writeBody(
32 Model model,
33 PrintWriter pw,
34 String base,
35 boolean inclXMLBase) {
36
37 space = "";
38 for (int i=0; i<tab;i++)
39 space += " ";
40
41 writeRDFHeader(model, pw);
42 writeRDFStatements(model, pw);
43 writeRDFTrailer(pw, base);
44 pw.flush();
45
46 }
47
48 protected void writeSpace( PrintWriter writer )
49 { writer.print( space ); }
50
51 private void writeRDFHeader(Model model, PrintWriter writer) {
52 String xmlns = xmlnsDecl();
53 NsIterator nsIter = model.listNameSpaces();
54 String ns;
55
56 writer.print("<" + rdfEl("RDF") + xmlns);
57
58 if (null != xmlBase && xmlBase.length() > 0) {
59
60 writer.print("\n xml:base=" + qq(xmlBase));
61 }
62 writer.println(" >");
63 }
64
65 protected void writeRDFStatements(Model model, PrintWriter writer)
66 {
67 ResIterator rIter = model.listSubjects();
68 while (rIter.hasNext()) {
69 writeRDFStatements(model, rIter.nextResource(), writer);
70 }
71 }
72
73 protected void writeRDFTrailer(PrintWriter writer, String base) {
74 writer.println("</" + rdfEl("RDF") + ">");
75 }
76
77 protected void writeRDFStatements(
78 Model model,
79 Resource subject,
80 PrintWriter writer)
81 {
82 StmtIterator sIter = model.listStatements( subject, null, (RDFNode) null );
83
84 writeDescriptionHeader(subject, writer);
85
86 while (sIter.hasNext()) {
87 writePredicate(sIter.nextStatement(), writer);
88 }
89 writeDescriptionTrailer( subject, writer);
90
91 }
92
93 protected void writeDescriptionHeader(Resource subject, PrintWriter writer)
94 {
95 writer.print(space + "<" + rdfEl("Description") + " ");
96 writeResourceId(subject, writer);
97 writer.println(">");
98 }
99
100 protected void writePredicate(Statement stmt, final PrintWriter writer)
101 {
102
103 final Property predicate = stmt.getPredicate();
104 final RDFNode object = stmt.getObject();
105
106 writer.print(space+space+
107 "<"
108 + startElementTag(
109 predicate.getNameSpace(),
110 predicate.getLocalName()));
111
112 if (object instanceof Resource) {
113 writer.print(" ");
114 writeResourceReference(((Resource) object), writer);
115 writer.println("/>");
116 } else {
117 writeLiteral((Literal) object, writer);
118 writer.println(
119 "</"
120 + endElementTag(
121 predicate.getNameSpace(),
122 predicate.getLocalName())
123 + ">");
124 }
125 }
126 void unblockAll() {
127 blockLiterals = false;
128 }
129 private boolean blockLiterals = false;
130 void blockRule(Resource r) {
131 if (r.equals(RDFSyntax.parseTypeLiteralPropertyElt)) {
132 blockLiterals = true;
134 } else
135 logger.warn("Cannot block rule <"+r.getURI()+">");
136 }
137
138 protected void writeDescriptionTrailer( Resource subject, PrintWriter writer) {
139 writer.println(space + "</" + rdfEl("Description") + ">");
140 }
141
142
146 protected void writeDescriptionTrailer( PrintWriter writer )
147 { writeDescriptionTrailer( null, writer ); }
148
149 protected void writeResourceId(Resource r, PrintWriter writer)
150 {
151 if (r.isAnon()) {
152 writer.print(rdfAt("nodeID") + "=" + q(anonId(r)));
153 } else {
154 writer.print(
155 rdfAt("about")
156 + "="
157 + qq(relativize(r.getURI())));
158 }
159 }
160
161 protected void writeResourceReference(Resource r, PrintWriter writer)
162 {
163 if (r.isAnon()) {
164 writer.print(rdfAt("nodeID") + "=" + q(anonId(r)));
165 } else {
166 writer.print(
167 rdfAt("resource")
168 + "="
169 + qq(relativize(r.getURI())));
170 }
171 }
172
173 protected void writeLiteral(Literal l, PrintWriter writer) {
174 String lang = l.getLanguage();
175 String form = l.getLexicalForm();
176 if (!lang.equals("")) {
177 writer.print(" xml:lang=" + q(lang));
178 }
179 if (l.getWellFormed() && !blockLiterals) {
180 writer.print(" " + rdfAt("parseType") + "=" + q("Literal")+">");
181 writer.print( form );
182 } else {
183 String dt = l.getDatatypeURI();
184 if (dt != null) writer.print( " " + rdfAt( "datatype" ) + "=" + qq( dt ) );
185 writer.print(">");
186 writer.print(Util.substituteEntitiesInElementContent( form ));
187 }
188 }
189
190 }
191
192 |
Popular Tags |
Java API By Example, From Geeks To Geeks.