/**
* 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 arq.examples.riot;
import java.io.OutputStream ;
import java.io.Writer ;
import org.apache.jena.atlas.io.IndentedWriter ;
import org.apache.jena.riot.* ;
import org.apache.jena.riot.adapters.RDFWriterRIOT ;
import org.apache.jena.riot.system.PrefixMap ;
import org.apache.jena.riot.system.RiotLib ;
import org.apache.jena.riot.writer.WriterGraphRIOTBase ;
import com.hp.hpl.jena.graph.Graph ;
import com.hp.hpl.jena.rdf.model.Model ;
import com.hp.hpl.jena.sparql.sse.SSE ;
import com.hp.hpl.jena.sparql.util.Context ;
/** Example of registering a new writer with RIOT */
public class ExRIOT_out3
{
// See also ExRIOT_5
public static void main(String[] args)
{
RIOT.init() ;
System.out.println("## Example of a registering a new language with RIOT") ;
System.out.println() ;
// Register the language
Lang lang = LangBuilder.create("SSE", "text/x-sse").addFileExtensions("rsse").build() ;
RDFLanguages.register(lang) ;
// Create format and register the association of language and default format.
// We are creating only one format here but in geenral theer can be variants
// (e.g. TURTLE - pretty printed or streamed)
RDFFormat format = new RDFFormat(lang) ;
RDFWriterRegistry.register(lang, format) ;
// Register the writer factory
RDFWriterRegistry.register(format, new SSEWriterFactory()) ;
// ---- Use the register writer
Model model = RDFDataMgr.loadModel("D.ttl") ;
// Write
System.out.println("## Write by format") ;
RDFDataMgr.write(System.out, model, format) ;
System.out.println() ;
System.out.println("## Write by language") ;
RDFDataMgr.write(System.out, model, lang) ;
// ---- Register for use with Model.read
// because naming is explicit, need to register an adapter.
IO_Jena.registerForModelWrite("SSE", RDFWriterSSE.class) ;
// and use it
model.write(System.out, "SSE") ;
}
static class SSEWriterFactory implements WriterGraphRIOTFactory
{
@Override
public WriterGraphRIOT create(RDFFormat syntaxForm)
{
return new SSEWriter() ;
}
}
static class SSEWriter extends WriterGraphRIOTBase
{
// Ignore externally provided prefix map and baseURI
@Override
public void write(OutputStream out, Graph graph, PrefixMap prefixMap, String baseURI, Context context)
{
SSE.write(out, graph) ;
}
@Override
public Lang getLang() { return RDFLanguages.contentTypeToLang("text/x-sse") ; }
@Override
public void write(Writer out, Graph graph, PrefixMap prefixMap, String baseURI, Context context)
{
// Writers are discouraged : just hope the charset is UTF-8.
IndentedWriter x = RiotLib.create(out) ;
SSE.write(x, graph) ;
}
}
// Model.write adapter - must be public.
public static class RDFWriterSSE extends RDFWriterRIOT { public RDFWriterSSE() { super("SSE") ; } }
}