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/*
* 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 org.apache.jena.riot;
import static org.apache.jena.riot.RDFLanguages.N3 ;
import static org.apache.jena.riot.RDFLanguages.NQUADS ;
import static org.apache.jena.riot.RDFLanguages.NTRIPLES ;
import static org.apache.jena.riot.RDFLanguages.RDFJSON ;
import static org.apache.jena.riot.RDFLanguages.RDFXML ;
import static org.apache.jena.riot.RDFLanguages.TRIG ;
import static org.apache.jena.riot.RDFLanguages.TURTLE ;
import static org.apache.jena.riot.RDFLanguages.RDFNULL ;
import static org.apache.jena.riot.RDFLanguages.filenameToLang ;
import java.io.InputStream ;
import java.io.Reader ;
import java.util.Iterator ;
import org.apache.jena.atlas.io.IO ;
import org.apache.jena.atlas.io.PeekReader ;
import org.apache.jena.atlas.iterator.IteratorResourceClosing ;
import org.apache.jena.atlas.json.io.parser.TokenizerJSON ;
import org.apache.jena.atlas.lib.Sink ;
import org.apache.jena.riot.lang.* ;
import org.apache.jena.riot.system.ErrorHandlerFactory ;
import org.apache.jena.riot.system.IRIResolver ;
import org.apache.jena.riot.system.RiotLib ;
import org.apache.jena.riot.system.StreamRDF ;
import org.apache.jena.riot.system.StreamRDFLib ;
import org.apache.jena.riot.tokens.Tokenizer ;
import org.apache.jena.riot.tokens.TokenizerFactory ;
import com.hp.hpl.jena.graph.Triple ;
import com.hp.hpl.jena.sparql.core.Quad ;
/** Operations to access RIOT parsers and send the output to
* a StreamRDF (triples or quads as appropriate).
* This class is probably not what you want to use.
* It is public to give maximum compatibility.
*
* @see RDFDataMgr for reading from a location, including web access and content negotation.
*/
public class RiotReader
{
/** Parse a file, sending output to a StreamRDF sink.
* Must be in a triples syntax.
* @param filename
* @param dest Where to send the triples from the parser.
*/
public static void parse(String filename, StreamRDF dest)
{ parse(filename, null, null, dest) ; }
/** Parse a file, sending output to a StreamRDF sink.
* Must be in a triples syntax.
* @param filename
* @param lang Language, or null for "guess from URL" (e.g. file extension)
* @param dest Where to send the triples from the parser.
*/
public static void parse(String filename, Lang lang, StreamRDF dest)
{
parse(filename, lang, null, dest) ;
}
/** Parse a file, sending output to a StreamRDF sink.
* Must be in a triples syntax.
* @param filename
* @param lang Language, or null for "guess from URL" (e.g. file extension)
* @param baseIRI Base IRI, or null for based on input filename
* @param dest Where to send the triples from the parser.
*/
public static void parse(String filename, Lang lang, String baseIRI, StreamRDF dest)
{
if ( lang == null )
lang = filenameToLang(filename, NTRIPLES) ;
InputStream in = IO.openFile(filename) ;
String base = SysRIOT.chooseBaseIRI(baseIRI, filename) ;
parse(in, lang, base, dest) ;
IO.close(in) ;
}
/** Parse an InputStream, using RDFParserOutput as the destination for the parser output.
* @param in Source for bytes to parse.
* @param lang Language.
* @param dest Where to send the triples from the parser.
*/
public static void parse(InputStream in, Lang lang, StreamRDF dest)
{
parse(in, lang, null, dest) ;
}
/** Parse an InputStream, using RDFParserOutput as the destination for the parser output.
* @param in Source for bytes to parse.
* @param lang Language.
* @param baseIRI Base IRI.
* @param dest Where to send the triples from the parser.
*/
public static void parse(InputStream in, Lang lang, String baseIRI, StreamRDF dest)
{
LangRIOT parser = RiotReader.createParser(in, lang, baseIRI, dest) ;
parser.parse() ;
}
// -------- Parsers
/** Create a parser */
public static LangRIOT createParser(InputStream input, Lang lang, String baseIRI, StreamRDF dest)
{
if ( lang == RDFXML )
{
if ( baseIRI != null )
baseIRI = IRIResolver.resolveString(baseIRI) ;
return LangRDFXML.create(input, baseIRI, baseIRI, ErrorHandlerFactory.getDefaultErrorHandler(), dest) ;
}
Tokenizer tokenizer = ( lang == RDFJSON ) ?
new TokenizerJSON(PeekReader.makeUTF8(input)) :
TokenizerFactory.makeTokenizerUTF8(input) ;
return createParser(tokenizer, lang, baseIRI, dest) ;
}
/** Create a parser */
public static LangRIOT createParser(Reader input, Lang lang, String baseIRI, StreamRDF dest)
{
if ( lang == RDFXML )
{
if ( baseIRI != null )
baseIRI = IRIResolver.resolveString(baseIRI) ;
return LangRDFXML.create(input, baseIRI, baseIRI, ErrorHandlerFactory.getDefaultErrorHandler(), dest) ;
}
Tokenizer tokenizer = ( lang == RDFJSON ) ?
new TokenizerJSON(PeekReader.make(input)) :
TokenizerFactory.makeTokenizer(input) ;
return createParser(tokenizer, lang, baseIRI, dest) ;
}
/** Create a parser */
public static LangRIOT createParser(Tokenizer tokenizer, Lang lang, String baseIRI, StreamRDF dest)
{
if ( RDFLanguages.sameLang(RDFXML, lang) )
throw new RiotException("Not possible - can't parse RDF/XML from a RIOT token stream") ;
if ( RDFLanguages.sameLang(TURTLE, lang) || RDFLanguages.sameLang(N3, lang) )
return createParserTurtle(tokenizer, baseIRI, dest) ;
if ( RDFLanguages.sameLang(NTRIPLES, lang) )
return createParserNTriples(tokenizer, dest) ;
if ( RDFLanguages.sameLang(RDFJSON, lang) )
// But it must be a JSON tokenizer ...
return createParserRdfJson(tokenizer, dest) ;
if ( RDFLanguages.sameLang(NQUADS, lang) )
return createParserNQuads(tokenizer, dest) ;
if ( RDFLanguages.sameLang(TRIG, lang) )
return createParserTriG(tokenizer, baseIRI, dest) ;
if ( RDFLanguages.sameLang(RDFNULL, lang) )
return new LangNull() ;
return null ;
}
/** Parse a file, sending triples to a sink.
* Must be in a triples syntax.
* @param filename
* @param sink Where to send the triples from the parser.
* @see RiotReader#parse(String,StreamRDF)
*/
public static void parseTriples(String filename, Sink sink)
{ parseTriples(filename, null, null, sink) ; }
/** Parse a file, sending triples to a sink.
* Must be in a triples syntax.
* @param filename
* @param lang Language, or null for "guess from URL" (e.g. file extension)
* @param baseIRI Base IRI, or null for based on input filename
* @param sink Where to send the triples from the parser.
* @see RiotReader#parse
*/
public static void parseTriples(String filename, Lang lang, String baseIRI, Sink sink)
{
StreamRDF dest = StreamRDFLib.sinkTriples(sink) ;
parse(filename, lang, baseIRI, dest) ;
}
/** Parse an InputStream, sending triples to a sink.
* @param in Source for bytes to parse.
* @param lang Language.
* @param baseIRI Base IRI.
* @param sink Where to send the triples from the parser.
* @see RiotReader#parse
*/
public static void parseTriples(InputStream in, Lang lang, String baseIRI, Sink sink)
{
StreamRDF dest = StreamRDFLib.sinkTriples(sink) ;
parse(in, lang, baseIRI, dest) ;
}
// -------- Quads
/** Parse a file, sending quads to a sink.
* @param filename
* @param sink Where to send the quads from the parser.
* @see RiotReader#parse
*/
public static void parseQuads(String filename, Sink sink)
{ parseQuads(filename, null, null, sink) ; }
/** Parse a file, sending quads to a sink.
* @param filename
* @param lang Language, or null for "guess from filename" (e.g. extension)
* @param baseIRI Base IRI, or null for base on input filename
* @param sink Where to send the quads from the parser.
* @see RiotReader#parse
*/
public static void parseQuads(String filename, Lang lang, String baseIRI, Sink sink)
{
StreamRDF dest = StreamRDFLib.sinkQuads(sink) ;
parse(filename, lang, baseIRI, dest) ;
}
/** Parse an InputStream, sending quads to a sink.
* @param in Source for bytes to parse.
* @param lang Language.
* @param baseIRI Base IRI.
* @param sink Where to send the quads from the parser.
* @see RiotReader#parse
*/
public static void parseQuads(InputStream in, Lang lang, String baseIRI, Sink sink)
{
StreamRDF dest = StreamRDFLib.sinkQuads(sink) ;
parse(in, lang, baseIRI, dest) ;
}
/**
* Create an iterator over the parsed triples
* @param input Input Stream
* @param lang Language
* @param baseIRI Base IRI
* @return Iterator over the triples
*/
public static Iterator createIteratorTriples(final InputStream input, final Lang lang, final String baseIRI)
{
// Special case N-Triples, because the RIOT reader has a pull interface
if ( RDFLanguages.sameLang(RDFLanguages.NTRIPLES, lang) )
{
return new IteratorResourceClosing(createParserNTriples(input, null), input);
}
else
{
// Otherwise, we have to spin up a thread to deal with it
final PipedRDFIterator it = new PipedRDFIterator();
final PipedTriplesStream out = new PipedTriplesStream(it);
Thread t = new Thread(new Runnable()
{
@Override
public void run()
{
parse(input, lang, baseIRI, out);
}
});
t.start();
return it;
}
}
/**
* Creates an iterator over the parsed quads
* @param input Input Stream
* @param lang Language
* @param baseIRI Base IRI
* @return Iterator over the quads
*/
public static Iterator createIteratorQuads(final InputStream input, final Lang lang, final String baseIRI)
{
// Special case N-Quads, because the RIOT reader has a pull interface
if ( RDFLanguages.sameLang(RDFLanguages.NQUADS, lang) )
{
return new IteratorResourceClosing(createParserNQuads(input, null), input);
}
else
{
// Otherwise, we have to spin up a thread to deal with it
final PipedRDFIterator it = new PipedRDFIterator();
final PipedQuadsStream out = new PipedQuadsStream(it);
Thread t = new Thread(new Runnable()
{
@Override
public void run()
{
parse(input, lang, baseIRI, out);
}
});
t.start();
return it;
}
}
/** Create a parser for Turtle
* @deprecated use an RDFDataMgr operation with argument Lang.Turtle
*/
@Deprecated
public static LangTurtle createParserTurtle(InputStream input, String baseIRI, StreamRDF dest)
{
Tokenizer tokenizer = TokenizerFactory.makeTokenizerUTF8(input) ;
return createParserTurtle(tokenizer, baseIRI, dest) ;
}
/** Create a parser for Turtle */
public static LangTurtle createParserTurtle(Tokenizer tokenizer, String baseIRI, StreamRDF dest)
{
LangTurtle parser = new LangTurtle(tokenizer, RiotLib.profile(RDFLanguages.TURTLE, baseIRI), dest) ;
return parser ;
}
/** Create a parser for RDF/XML
* @deprecated use an RDFDataMgr operation with argument Lang.RDFXML
*/
@Deprecated
public static LangRDFXML createParserRDFXML(InputStream input, String baseIRI, StreamRDF dest)
{
if ( baseIRI == null )
baseIRI = SysRIOT.chooseBaseIRI() ;
LangRDFXML parser = LangRDFXML.create(input, baseIRI, baseIRI, ErrorHandlerFactory.getDefaultErrorHandler(), dest) ;
return parser ;
}
/** Create parsers for RDF/JSON */
public static LangRDFJSON createParserRdfJson(Tokenizer tokenizer, StreamRDF dest)
{
LangRDFJSON parser = new LangRDFJSON(tokenizer, RiotLib.profile(RDFLanguages.RDFJSON, null), dest) ;
return parser;
}
/**
* @deprecated use RDFDataMgr and Lang.RDFJSON
*/
@Deprecated
public static LangRDFJSON createParserRdfJson(InputStream input, StreamRDF dest)
{
TokenizerJSON tokenizer = new TokenizerJSON(PeekReader.makeUTF8(input)) ;
return createParserRdfJson(tokenizer, dest) ;
}
/** Create a parser for TriG
* @deprecated use an RDFDataMgr operation with argument Lang.TRIG
*/
@Deprecated
public static LangTriG createParserTriG(InputStream input, String baseIRI, StreamRDF dest)
{
Tokenizer tokenizer = TokenizerFactory.makeTokenizerUTF8(input) ;
return createParserTriG(tokenizer, baseIRI, dest) ;
}
/** Create a parser for TriG */
public static LangTriG createParserTriG(Tokenizer tokenizer, String baseIRI, StreamRDF dest)
{
LangTriG parser = new LangTriG(tokenizer, RiotLib.profile(RDFLanguages.TRIG, baseIRI), dest) ;
return parser ;
}
/** Create a parser for N-Triples
* @deprecated use an RDFDataMgr operation with argument Lang.NTRIPLES
*/
@Deprecated
public static LangNTriples createParserNTriples(InputStream input, StreamRDF dest)
{
Tokenizer tokenizer = TokenizerFactory.makeTokenizerASCII(input) ;
return createParserNTriples(tokenizer, dest) ;
}
/** Create a parser for N-Triples */
public static LangNTriples createParserNTriples(Tokenizer tokenizer, StreamRDF dest)
{
LangNTriples parser = new LangNTriples(tokenizer, RiotLib.profile(RDFLanguages.NTRIPLES, null), dest) ;
return parser ;
}
/** Create a parser for NQuads
* @deprecated use an RDFDataMgr operation with argument Lang.NQUADS)
*/
@Deprecated
public static LangNQuads createParserNQuads(InputStream input, StreamRDF dest)
{
Tokenizer tokenizer = TokenizerFactory.makeTokenizerASCII(input) ;
return createParserNQuads(tokenizer, dest) ;
}
/** Create a parser for NQuads */
public static LangNQuads createParserNQuads(Tokenizer tokenizer, StreamRDF dest)
{
LangNQuads parser = new LangNQuads(tokenizer, RiotLib.profile(RDFLanguages.NQUADS, null), dest) ;
return parser ;
}
}
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