| /* |
| * 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(); |
| } |
| |
| } |