/*
* (c) Copyright 2010 Talis Systems Ltd.
* All rights reserved.
* [See end of file]
*/
package org.openjena.riot;
import java.io.InputStream ;
import org.openjena.atlas.io.IO ;
import org.openjena.atlas.lib.Sink ;
import org.openjena.riot.lang.LangRIOT ;
import org.openjena.riot.lang.SinkQuadsToDataset ;
import org.openjena.riot.lang.SinkTriplesToGraph ;
import org.openjena.riot.tokens.Tokenizer ;
import org.openjena.riot.tokens.TokenizerFactory ;
import com.hp.hpl.jena.graph.Graph ;
import com.hp.hpl.jena.graph.Triple ;
import com.hp.hpl.jena.sparql.core.DatasetGraph ;
import com.hp.hpl.jena.sparql.core.Quad ;
import com.hp.hpl.jena.sparql.lib.DatasetLib ;
/** Convenience operations to read RDF into graphs and datasets,
* optionally creating an in-memory object as container.
* Methods named "load
" create containers, methods,
* called "read
" take a container as argument.
*/
public class RiotLoader
{
// static private Loader loader = new Loader() ;
// static public Loader get() { return loader ; }
/** Parse a file and return the quads in a dataset (in-memory) */
public static DatasetGraph load(String filename)
{
return load(filename, Lang.guess(filename, Lang.NQUADS)) ;
}
/** Parse a file and return the quads in a dataset (in-memory) */
public static DatasetGraph load(String filename, Lang lang)
{
DatasetGraph dsg = DatasetLib.createDatasetGraphMem() ;
read(filename, dsg, lang, null) ;
return dsg ;
}
/** Parse a file and return the quads in a dataset (in-memory) */
public static DatasetGraph load(String filename, Lang lang, String baseURI)
{
DatasetGraph dsg = DatasetLib.createDatasetGraphMem() ;
read(filename, dsg, lang, baseURI) ;
return dsg ;
}
/** Parse a string and return the quads in a dataset (in-memory) (convenience operation)*/
public static DatasetGraph datasetFromString(String string, Lang language, String baseURI)
{
DatasetGraph dsg = DatasetLib.createDatasetGraphMem() ;
Sink sink = RiotLoader.datasetSink(dsg) ;
Tokenizer tokenizer = TokenizerFactory.makeTokenizerString(string) ;
if ( language == Lang.NQUADS )
{
LangRIOT parser = RiotReader.createParserNQuads(tokenizer, sink) ;
parser.parse() ;
sink.flush();
return dsg;
}
if ( language == Lang.TRIG )
{
LangRIOT parser = RiotReader.createParserTriG(tokenizer, baseURI, sink) ;
parser.parse() ;
sink.flush();
return dsg;
}
return dsg ;
}
/** Parse a file into a dataset graph */
public static void read(String filename, DatasetGraph dataset)
{
Lang lang = Lang.guess(filename) ;
if ( lang == null )
throw new RiotException("Can't guess language for "+filename) ;
InputStream input = IO.openFile(filename) ;
read(input, dataset, lang, filename) ;
}
/** Parse a file to a dataset */
public static void read(String filename, DatasetGraph dataset, Lang lang)
{
read(filename, dataset, lang, filename) ;
}
/** Parse a file to a dataset */
public static void read(String filename, DatasetGraph dataset, Lang lang, String baseURI)
{
InputStream input = IO.openFile(filename) ;
read(input, dataset, lang, filename) ;
}
/** Parse an input stream and send the quads to a dataset */
public static void read(InputStream input, DatasetGraph dataset, Lang language, String baseURI)
{
if ( language.isQuads() )
{
Sink sink = datasetSink(dataset) ;
readQuads(input, language, baseURI, sink) ;
}
else
{
Sink sink = graphSink(dataset.getDefaultGraph()) ;
readTriples(input, language, baseURI, sink) ;
}
}
/** Parse an input stream and send the quads to the sink */
public static void readQuads(InputStream input, Lang language, String baseURI, Sink sink)
{
if ( language == Lang.NQUADS )
{
LangRIOT parser = RiotReader.createParserNQuads(input, sink) ;
parser.parse() ;
sink.flush();
return ;
}
if ( language == Lang.TRIG )
{
LangRIOT parser = RiotReader.createParserTriG(input, baseURI, sink) ;
parser.parse() ;
sink.flush();
return ;
}
throw new RiotException("Language not supported for quads: "+language) ;
}
/** Parse an input stream and send the triples to the sink */
public static void readTriples(InputStream input, Lang language, String baseURI, Sink sink)
{
LangRIOT parser ;
switch (language)
{ case NTRIPLES :
parser = RiotReader.createParserNTriples(input, sink) ;
break ;
case TURTLE:
parser = RiotReader.createParserTurtle(input, baseURI, sink) ;
break ;
default:
throw new RiotException("Language not supported for triples: "+language) ;
}
parser.parse() ;
sink.flush();
return ;
}
// Better place?
// DatasetLoader + "ModelLib" with model graph versions
public static Sink graphSink(Graph graph)
{
return new SinkTriplesToGraph(graph) ;
}
public static Sink datasetSink(DatasetGraph dataset)
{
return new SinkQuadsToDataset(dataset) ;
}
}
/*
* (c) Copyright 2010 Talis Systems Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/