/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hp.hpl.jena.xmloutput.impl;
import java.io.PrintWriter;
import com.hp.hpl.jena.rdf.model.Literal;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.Property;
import com.hp.hpl.jena.rdf.model.RDFNode;
import com.hp.hpl.jena.rdf.model.ResIterator;
import com.hp.hpl.jena.rdf.model.Resource;
import com.hp.hpl.jena.rdf.model.Statement;
import com.hp.hpl.jena.rdf.model.StmtIterator;
import com.hp.hpl.jena.rdf.model.impl.Util;
import com.hp.hpl.jena.vocabulary.RDFSyntax;
/** Writes out an XML serialization of a model.
*
* @author bwm
* @version Release='$Name: not supported by cvs2svn $' Revision='$Revision: 1.1 $' Date='$Date: 2009-06-29 08:55:51 $'
*/
public class Basic extends BaseXMLWriter
{
public Basic()
{}
private String space;
@Override protected void writeBody
( Model model, PrintWriter pw, String base, boolean inclXMLBase )
{
setSpaceFromTabCount();
writeRDFHeader( model, pw );
writeRDFStatements( model, pw );
writeRDFTrailer( pw, base );
pw.flush();
}
private void setSpaceFromTabCount()
{
space = "";
for (int i=0; i < tabSize; i += 1) space += " ";
}
protected void writeSpace( PrintWriter writer )
{ writer.print( space ); }
private void writeRDFHeader(Model model, PrintWriter writer)
{
String xmlns = xmlnsDecl();
writer.print( "<" + rdfEl( "RDF" ) + xmlns );
if (null != xmlBase && xmlBase.length() > 0)
writer.print( "\n xml:base=" + substitutedAttribute( xmlBase ) );
writer.println( " > " );
}
protected void writeRDFStatements( Model model, PrintWriter writer )
{
ResIterator rIter = model.listSubjects();
while (rIter.hasNext()) writeRDFStatements( model, rIter.nextResource(), writer );
}
protected void writeRDFTrailer( PrintWriter writer, String base )
{ writer.println( "</" + rdfEl( "RDF" ) + ">" ); }
protected void writeRDFStatements
( Model model, Resource subject, PrintWriter writer )
{
StmtIterator sIter = model.listStatements( subject, null, (RDFNode) null );
writeDescriptionHeader( subject, writer );
while (sIter.hasNext()) writePredicate( sIter.nextStatement(), writer );
writeDescriptionTrailer( subject, writer );
}
protected void writeDescriptionHeader( Resource subject, PrintWriter writer)
{
writer.print( space + "<" + rdfEl( "Description" ) + " " );
writeResourceId( subject, writer );
writer.println( ">" );
}
protected void writePredicate(Statement stmt, final PrintWriter writer)
{
final Property predicate = stmt.getPredicate();
final RDFNode object = stmt.getObject();
writer.print(space+space+
"<"
+ startElementTag(
predicate.getNameSpace(),
predicate.getLocalName()));
if (object instanceof Resource) {
writer.print(" ");
writeResourceReference(((Resource) object), writer);
writer.println("/>");
} else {
writeLiteral((Literal) object, writer);
writer.println(
"</"
+ endElementTag(
predicate.getNameSpace(),
predicate.getLocalName())
+ ">");
}
}
@Override protected void unblockAll()
{ blockLiterals = false; }
private boolean blockLiterals = false;
@Override protected void blockRule( Resource r ) {
if (r.equals( RDFSyntax.parseTypeLiteralPropertyElt )) {
// System.err.println("Blocking");
blockLiterals = true;
} else
logger.warn("Cannot block rule <"+r.getURI()+">");
}
protected void writeDescriptionTrailer( Resource subject, PrintWriter writer )
{ writer.println( space + "</" + rdfEl( "Description" ) + ">" ); }
protected void writeResourceId( Resource r, PrintWriter writer )
{
if (r.isAnon()) {
writer.print(rdfAt("nodeID") + "=" + attributeQuoted(anonId(r)));
} else {
writer.print(
rdfAt("about")
+ "="
+ substitutedAttribute(relativize(r.getURI())));
}
}
protected void writeResourceReference( Resource r, PrintWriter writer )
{
if (r.isAnon()) {
writer.print(rdfAt("nodeID") + "=" + attributeQuoted(anonId(r)));
} else {
writer.print(
rdfAt("resource")
+ "="
+ substitutedAttribute(relativize(r.getURI())));
}
}
protected void writeLiteral( Literal l, PrintWriter writer ) {
String lang = l.getLanguage();
String form = l.getLexicalForm();
if (!lang.equals("")) {
writer.print(" xml:lang=" + attributeQuoted( lang ));
}
if (l.isWellFormedXML() && !blockLiterals) {
writer.print(" " + rdfAt("parseType") + "=" + attributeQuoted( "Literal" )+">");
writer.print( form );
} else {
String dt = l.getDatatypeURI();
if (dt != null) writer.print( " " + rdfAt( "datatype" ) + "=" + substitutedAttribute( dt ) );
writer.print(">");
writer.print( Util.substituteEntitiesInElementContent( form ) );
}
}
}