/*
* Copyright 2009 Niclas Hedhman.
*
* Licensed 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 org.qi4j.library.rdf.serializer;
import java.io.Writer;
import org.openrdf.model.Statement;
import org.openrdf.rio.RDFHandlerException;
import org.openrdf.rio.RDFWriter;
import org.openrdf.rio.RDFWriterFactory;
import org.qi4j.library.rdf.Qi4jRdf;
import org.qi4j.library.rdf.Rdfs;
abstract class AbstractSerializer
implements Serializer
{
private Class<? extends RDFWriterFactory> writerFactoryClass;
protected AbstractSerializer( Class<? extends RDFWriterFactory> writerFactoryClass )
{
this.writerFactoryClass = writerFactoryClass;
}
@Override
public void serialize( Iterable<Statement> graph, Writer out ) throws RDFHandlerException
{
String[] prefixes = { "qi4j", "rdf", "rdfs" };
String[] namespaces = { Qi4jRdf.QI4JMODEL, Rdfs.RDF, Rdfs.RDFS };
serialize( graph, out, prefixes, namespaces );
}
@Override
public void serialize( Iterable<Statement> graph, Writer out, String[] namespacePrefixes, String[] namespaces )
throws RDFHandlerException
{
RDFWriterFactory writerFactory;
try
{
writerFactory = writerFactoryClass.newInstance();
}
catch( InstantiationException e )
{
throw new InternalError();
}
catch( IllegalAccessException e )
{
throw new InternalError();
}
RDFWriter writer = writerFactory.getWriter( out );
writer.startRDF();
for( int i = 0; i < namespacePrefixes.length; i++ )
{
String namespacePrefix = namespacePrefixes[ i ];
String namespace = namespaces[ i ];
writer.handleNamespace( namespacePrefix, namespace );
}
for( Statement st : graph )
{
writer.handleStatement( st );
}
writer.endRDF();
}
}