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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 java.io.* ;
import java.util.Iterator ;
import org.apache.jena.atlas.io.IO ;
import org.apache.jena.atlas.web.ContentType ;
import org.apache.jena.atlas.web.TypedInputStream ;
import org.apache.jena.riot.stream.StreamManager ;
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.writer.NQuadsWriter ;
import org.apache.jena.riot.writer.NTriplesWriter ;
import org.slf4j.Logger ;
import org.slf4j.LoggerFactory ;
import com.hp.hpl.jena.graph.Graph ;
import com.hp.hpl.jena.graph.Triple ;
import com.hp.hpl.jena.query.Dataset ;
import com.hp.hpl.jena.query.DatasetFactory ;
import com.hp.hpl.jena.rdf.model.Model ;
import com.hp.hpl.jena.rdf.model.ModelFactory ;
import com.hp.hpl.jena.sparql.core.DatasetGraph ;
import com.hp.hpl.jena.sparql.core.DatasetGraphFactory ;
import com.hp.hpl.jena.sparql.core.Quad ;
import com.hp.hpl.jena.sparql.graph.GraphFactory ;
import com.hp.hpl.jena.sparql.util.Context ;
import com.hp.hpl.jena.sparql.util.Symbol ;
import com.hp.hpl.jena.sparql.util.Utils ;
/** General purpose reader framework for RDF (triples and quads) syntaxes.
*
* - HTTP Content negotiation
* - File type hint by the extension
* - Application language hint
*
*
* It also provides a way to lookup names in different
* locations and to remap URIs to other URIs.
*
*
* Extensible - a new syntax can be added to the framework.
*
* Operations fall into the following categories:
*
* - {@code read} -- Read data from a location into a Model/Dataset etc
* - {@code loadXXX} -- Read data and return an in-memory object holding the data.
* - {@code parse} -- Read data and send to an {@link StreamRDF}
* - {@code open} -- Open a typed input stream to the location, using any alternative locations
* - {@code write} -- Write Model/Dataset etc
*
*/
public class RDFDataMgr
{
static { RIOT.init() ; }
/* Maybe:
* static for global (singleton) and locally tailored.
*/
static Logger log = LoggerFactory.getLogger(RDFDataMgr.class) ;
private static String riotBase = "http://jena.apache.org/riot/" ;
private static String streamManagerSymbolStr = riotBase+"streamManager" ;
public static Symbol streamManagerSymbol = Symbol.create(streamManagerSymbolStr) ;
/** Read triples into a Model from the given location.
* The syntax is detemined from input source URI (content negotiation or extension).
* @param model Destination for the RDF read.
* @param uri URI to read from (includes file: and a plain file name).
* @throws RiotNotFoundException if the location is not found - the model is unchanged.
* @see #read(Model,String,Lang,Context)
*/
public static void read(Model model, String uri) { read(model.getGraph(), uri) ; }
/** Read triples into a Model from the given location.
* The syntax is detemined from input source URI (content negotiation or extension).
* @param graph Destination for the RDF read.
* @param uri URI to read from (includes file: and a plain file name).
* @throws RiotNotFoundException if the location is not found - the graph is unchanged.
* @see #read(Graph,String,Lang,Context)
*/
public static void read(Graph graph, String uri) { read(graph, uri, null, null, null) ; }
/** Read triples into a Model from the given location, with a hint of the language (MIME type)
* @param model Destination for the RDF read.
* @param uri URI to read from (includes file: and a plain file name).
* @param hintLang Hint for the syntax.
* @throws RiotNotFoundException if the location is not found - the model is unchanged.
* @see #read(Model,String,String,Lang,Context)
*/
public static void read(Model model, String uri, Lang hintLang) { read(model.getGraph(), uri, hintLang) ; }
/** Read triples into a Model from the given location, with a hint of the language (MIME type or short name)
* @param graph Destination for the RDF read.
* @param uri URI to read from (includes file: and a plain file name).
* @param hintLang Hint for the syntax.
* @throws RiotNotFoundException if the location is not found - the graph is unchanged.
* @see #read(Graph,String,Lang,Context)
*/
public static void read(Graph graph, String uri, Lang hintLang) { read(graph, uri, hintLang, null) ; }
/** Read triples into a Model from the given location, with hint of language and with some parameters for the reader
* @see #read(Model,String,String,Lang,Context)
* Throws parse errors depending on the language and reader; the model may be partially updated.
* @param model Destination for the RDF read.
* @param uri URI to read from (includes file: and a plain file name).
* @param base Base URI (defaults to uri).
* @param hintLang Hint for the syntax
* @throws RiotNotFoundException if the location is not found - the model is unchanged.
*/
public static void read(Model model, String uri, String base, Lang hintLang) { read(model.getGraph(), uri, base, hintLang) ; }
/** Read triples into a Model from the given location, with hint of language and the with some parameters for the reader
* @see #read(Graph,String,String,Lang,Context)
* Throws parse errors depending on the language and reader; the Model model may be partially updated.
* @param graph Destination for the RDF read.
* @param uri URI to read from (includes file: and a plain file name).
* @param base Base URI (defaults to uri).
* @param hintLang Hint for the syntax
* @throws RiotNotFoundException if the location is not found - the graph is unchanged.
*/
public static void read(Graph graph, String uri, String base, Lang hintLang) { read(graph, uri, base, hintLang, null) ; }
/** Read triples into a Model from the given location, with some parameters for the reader
* @see #read(Model,String,String,Lang,Context)
* @param model Destination for the RDF read
* @param uri URI to read from (includes file: and a plain file name).
* @param context Content object to control reading process.
* @throws RiotNotFoundException if the location is not found - the model is unchanged.
*/
public static void read(Model model, String uri, Context context) { read(model.getGraph(), uri, context) ; }
/** Read triples into a Model from the given location, with some parameters for the reader
* @see #read(Graph,String,String,Lang,Context)
* @param graph Destination for the RDF read
* @param uri URI to read from (includes file: and a plain file name).
* @param context Content object to control reading process.
* @throws RiotNotFoundException if the location is not found - the graph is unchanged.
*/
public static void read(Graph graph, String uri, Context context) { read(graph, uri, null, context) ; }
/** Read triples into a Model from the given location, with hint of language and the with some parameters for the reader
* @see #read(Model,String,String,Lang,Context)
* @param model Destination for the RDF read
* @param uri URI to read from (includes file: and a plain file name).
* @param hintLang Hint for the syntax
* @param context Content object to control reading process.
* @throws RiotNotFoundException if the location is not found - the model is unchanged.
*/
public static void read(Model model, String uri, Lang hintLang, Context context)
{ read(model, uri, uri, hintLang, context) ; }
/** Read triples into a Model from the given location, with hint of language and with some parameters for the reader
* @see #read(Graph,String,String,Lang,Context)
* @param graph Destination for the RDF read
* @param uri URI to read from (includes file: and a plain file name).
* @param hintLang Hint for the syntax
* @param context Content object to control reading process.
* @throws RiotNotFoundException if the location is not found - the graph is unchanged.
*/
public static void read(Graph graph, String uri, Lang hintLang, Context context)
{ read(graph, uri, uri, hintLang, context) ; }
/** Read triples into a Model from the given location, with hint of language
* and with some parameters for the reader.
* Throws parse errors depending on the language and reader; the model may be partially updated.
* @param model Destination for the RDF read.
* @param uri URI to read from (includes file: and a plain file name).
* @param base Base URI (defaults to uri).
* @param hintLang Hint for the syntax
* @param context Content object to control reading process.
* @throws RiotNotFoundException if the location is not found - the model is unchanged.
*/
public static void read(Model model, String uri, String base, Lang hintLang, Context context)
{ read(model.getGraph(), uri, base, hintLang, context) ; }
/** Read triples into a Model from the given location, with hint of language and the with some parameters for the reader
* Throws parse errors depending on the language and reader; the graph may be partially updated.
* @param graph Destination for the RDF read.
* @param uri URI to read from (includes file: and a plain file name).
* @param base Base URI (defaults to uri).
* @param hintLang Hint for the syntax
* @param context Content object to control reading process.
* @throws RiotNotFoundException if the location is not found - the model is unchanged.
*/
public static void read(Graph graph, String uri, String base, Lang hintLang, Context context)
{
StreamRDF dest = StreamRDFLib.graph(graph) ;
parse(dest, uri, base, hintLang, context) ;
}
/** Read triples into a Model with bytes from an InputStream.
* A base URI and a syntax can be provided.
* The base URI defualts to "no base" in which case the data should have no relative URIs.
* The lang gives the syntax of the stream.
* @param model Destination for the RDF read.
* @param in InputStream
* @param lang Language syntax
*/
public static void read(Model model, InputStream in, Lang lang) { read(model.getGraph(), in, lang) ; }
/** Read triples into a Model with bytes from an InputStream.
* A base URI and a syntax can be provided.
* The base URI defualts to "no base" in which case the data should have no relative URIs.
* The lang gives the syntax of the stream.
* @param graph Destination for the RDF read.
* @param in InputStream
* @param lang Language syntax
*/
public static void read(Graph graph, InputStream in, Lang lang) { read(graph, in, null, lang) ; }
/** Read triples into a Model with bytes from an InputStream.
* A base URI and a syntax can be provided.
* The base URI defualts to "no base" in which case the data should have no relative URIs.
* The lang gives the syntax of the stream.
* @param model Destination for the RDF read.
* @param in InputStream
* @param base Base URI
* @param lang Language syntax
*/
public static void read(Model model, InputStream in, String base, Lang lang)
{ read(model.getGraph(), in, base, lang) ; }
/** Read triples into a Model with bytes from an InputStream.
* A base URI and a syntax can be provided.
* The base URI defualts to "no base" in which case the data should have no relative URIs.
* The lang gives the syntax of the stream.
* @param graph Destination for the RDF read.
* @param in InputStream
* @param base Base URI
* @param lang Language syntax
*/
public static void read(Graph graph, InputStream in, String base, Lang lang)
{
StreamRDF dest = StreamRDFLib.graph(graph) ;
process(dest, new TypedInputStream(in), base, lang, null) ;
}
/** Read triples into a model with chars from an Reader.
* Use of java.io.Readers is not encouraged - use with a StringReader is the primary use case.
* For files, open a {@link java.io.FileInputStream} to ensure correct character set handling.
* @deprecated Use an InputStream or StringReader.
* @param model Destination for the RDF read.
* @param in Reader
* @param base Base URI
* @param lang Language syntax
*/
@Deprecated
public static void read(Model model, Reader in, String base, Lang lang)
{
read(model.getGraph(), in, base, lang) ;
}
/** Read triples into a model with chars from an Reader.
* Use of java.io.Readers is not encouraged - use with a StringReader is the primary use case.
* For files, open a {@link java.io.FileInputStream} to ensure correct character set handling.
* @deprecated Use an InputStream or StringReader.
* @param graph Destination for the RDF read.
* @param in Reader
* @param base Base URI
* @param lang Language syntax
*/
@Deprecated
public static void read(Graph graph, Reader in, String base, Lang lang)
{
StreamRDF dest = StreamRDFLib.graph(graph) ;
process(dest, in, base, lang, null) ;
}
/** Read triples into a model with chars from a StringReader.
* @param model Destination for the RDF read.
* @param in InputStream
* @param base Base URI
* @param lang Language syntax
*/
public static void read(Model model, StringReader in, String base, Lang lang)
{
Graph g = model.getGraph() ;
StreamRDF dest = StreamRDFLib.graph(g) ;
process(dest, in, base, lang, null) ;
}
/** Read triples into a model with chars from a StringReader.
* @param graph Destination for the RDF read.
* @param in InputStream
* @param base Base URI
* @param lang Language syntax
*/
public static void read(Graph graph, StringReader in, String base, Lang lang)
{
StreamRDF dest = StreamRDFLib.graph(graph) ;
process(dest, in, base, lang, null) ;
}
private static Model createModel() { return ModelFactory.createDefaultModel() ; }
private static Graph createGraph() { return GraphFactory.createDefaultGraph() ; }
private static Dataset createDataset() { return DatasetFactory.createMem() ; }
private static DatasetGraph createDatasetGraph() { return DatasetGraphFactory.createMem() ; }
// Load:
// Macros would be nice.
/** Create a memory Model and read in some data
* @see #read(Model,String)
*/
public static Model loadModel(String uri)
{
Model m = createModel() ;
read(m, uri) ;
return m ;
}
/** Create a memory Model and read in some data
* @see #read(Model,String,Lang)
*/
public static Model loadModel(String uri, Lang lang)
{
Model m = createModel() ;
read(m, uri,lang) ;
return m ;
}
//public static Model loadModel(String uri, String base) { return null ; }
//public static Model loadModel(String uri, String base, Lang lang) { return null ; }
/** Create a memory Graph and read in some data
* @see #read(Graph,String)
*/
public static Graph loadGraph(String uri)
{
Graph g = createGraph() ;
read(g, uri) ;
return g ;
}
/** Create a memory Graph and read in some data
* @see #read(Graph,String,Lang)
*/
public static Graph loadGraph(String uri, Lang lang)
{
Graph g = createGraph() ;
read(g, uri, lang) ;
return g ;
}
// public static Graph loadGraph(String uri, String base) { return null ; }
// public static Graph loadGraph(String uri, String base, Lang lang) { return null ; }
/** Create a memory Dataset and read in some data
* @see #read(Dataset,String)
*/
public static Dataset loadDataset(String uri)
{
Dataset ds = createDataset() ;
read(ds, uri) ;
return ds ;
}
/** Create a memory Dataset and read in some data
* @see #read(Dataset,String,Lang)
*/
public static Dataset loadDataset(String uri, Lang lang)
{
Dataset ds = createDataset() ;
read(ds, uri, lang) ;
return ds ;
}
// public static Dataset loadDataset(String uri, String base) { return null ; }
// public static Dataset loadDataset(String uri, String base, Lang lang) { return null ; }
// public static Dataset loadDataset(String uri, String base, Lang lang, Context context) { return null ; }
/** Create a memory DatasetGraph and read in some data
* @see #read(DatasetGraph,String)
*/
public static DatasetGraph loadDatasetGraph(String uri)
{
DatasetGraph ds = createDatasetGraph() ;
read(ds, uri) ;
return ds ;
}
/** Create a memory DatasetGraph and read in some data
* @see #read(DatasetGraph,String,Lang)
*/
public static DatasetGraph loadDatasetGraph(String uri, Lang lang)
{
DatasetGraph ds = createDatasetGraph() ;
read(ds, uri, lang) ;
return ds ;
}
// public static DatasetGraph loadDatasetGraph(String uri, String base) { return null ; }
// public static DatasetGraph loadDatasetGraph(String uri, String base, Lang lang) { return null ; }
// public static DatasetGraph loadDatasetGraph(String uri, String base, Lang lang, Context context) { return null ; }
/** Read quads or triples into a Dataset from the given location, with hint of language.
* @see #read(Dataset, String, String, Lang, Context)
* @param dataset Destination
* @param uri URI to read from (includes file: and a plain file name).
*/
public static void read(Dataset dataset, String uri)
{
read(dataset.asDatasetGraph(), uri) ;
}
/** Read quads or triples into a Dataset from the given location, with hint of language.
* @see #read(DatasetGraph, String, String, Lang, Context)
* @param dataset Destination
* @param uri URI to read from (includes file: and a plain file name).
*/
public static void read(DatasetGraph dataset, String uri)
{
read(dataset, uri, null) ;
}
/** Read quads or triples into a Dataset from the given location, with hint of language.
* @see #read(Dataset, String, String, Lang, Context)
* @param dataset Destination
* @param uri URI to read from (includes file: and a plain file name).
* @param hintLang Language syntax
*/
public static void read(Dataset dataset, String uri, Lang hintLang)
{
read(dataset.asDatasetGraph(), uri, hintLang) ;
}
/** Read quads or triples into a Dataset from the given location, with hint of language.
* @see #read(DatasetGraph, String, String, Lang, Context)
* @param dataset Destination
* @param uri URI to read from (includes file: and a plain file name).
* @param hintLang Language syntax
*/
public static void read(DatasetGraph dataset, String uri, Lang hintLang)
{
read(dataset, uri, hintLang, null) ;
}
/** Read quads or triples into a Dataset from the given location, with hint of language.
* @see #read(Dataset, String, String, Lang, Context)
* @param dataset Destination
* @param uri URI to read from (includes file: and a plain file name).
* @param base Base URI (defaults to uri).
* @param hintLang Language syntax
*/
public static void read(Dataset dataset, String uri, String base, Lang hintLang)
{
read(dataset.asDatasetGraph(), uri, base, hintLang) ;
}
/** Read quads or triples into a Dataset from the given location, with hint of language.
* @see #read(DatasetGraph, String, String, Lang, Context)
* @param dataset Destination
* @param uri URI to read from (includes file: and a plain file name).
* @param base Base URI (defaults to uri).
* @param hintLang Language syntax
*/
public static void read(DatasetGraph dataset, String uri, String base, Lang hintLang)
{
read(dataset, uri, base, hintLang, null) ;
}
/** Read quads or triples into a Dataset from the given location.
* @see #read(Dataset, String, String, Lang, Context)
* @param dataset Destination
* @param uri URI to read from (includes file: and a plain file name).
* @param hintLang Language syntax
*/
public static void read(Dataset dataset, String uri, Lang hintLang, Context context)
{
read(dataset.asDatasetGraph(), uri, hintLang, context) ;
}
/** Read quads or triples into a Dataset from the given location.
* @see #read(DatasetGraph, String, String, Lang, Context)
* @param dataset Destination
* @param uri URI to read from (includes file: and a plain file name).
* @param hintLang Language syntax
*/
public static void read(DatasetGraph dataset, String uri, Lang hintLang, Context context)
{
read(dataset, uri, uri, hintLang, context) ;
}
/** Read quads or triples into a Dataset from the given location.
* @see #read(Dataset, String, String, Lang, Context)
* @param dataset Destination
* @param uri URI to read from (includes file: and a plain file name).
* @param base Base URI (defaults to uri).
* @param hintLang Language syntax
* @param context Context for the reader
* @throws RiotNotFoundException if the location is not found - the dataset is unchanged.
* Throws parse errors depending on the language and reader; the dataset may be partially updated.
*/
public static void read(Dataset dataset, String uri, String base, Lang hintLang, Context context)
{
read(dataset.asDatasetGraph(), uri, uri, hintLang, context) ;
}
/** Read quads or triples into a Dataset from the given location.
* @see #read(Dataset, String, String, Lang, Context)
* @param dataset Destination
* @param uri URI to read from (includes file: and a plain file name).
* @param base Base URI (defaults to uri).
* @param hintLang Language syntax
* @param context Context for the reader
* @throws RiotNotFoundException if the location is not found - the dataset is unchanged.
* Throws parse errors depending on the language and reader; the dataset may be partially updated.
*/
public static void read(DatasetGraph dataset, String uri, String base, Lang hintLang, Context context)
{
StreamRDF sink = StreamRDFLib.dataset(dataset) ;
parse(sink, uri, base, hintLang, context) ;
}
/** Read quads or triples into a dataset with bytes from an input stream.
* @param dataset Destination
* @param in InputStream
* @param lang Language syntax
*/
public static void read(Dataset dataset, InputStream in, Lang lang)
{
read(dataset.asDatasetGraph(), in, lang) ;
}
/** Read quads or triples into a dataset with bytes from an input stream.
* @param dataset Destination
* @param in InputStream
* @param lang Language syntax
*/
public static void read(DatasetGraph dataset, InputStream in, Lang lang)
{
read(dataset, in, null, lang) ;
}
/** Read quads or triples into a dataset with bytes from an input stream.
* @param dataset Destination
* @param in InputStream
* @param base Base URI
* @param lang Language syntax
*/
public static void read(Dataset dataset, InputStream in, String base, Lang lang)
{
read(dataset.asDatasetGraph(), in, base, lang) ;
}
/** Read quads or triples into a dataset with bytes from an input stream.
* @param dataset Destination
* @param in InputStream
* @param base Base URI
* @param lang Language syntax
*/
public static void read(DatasetGraph dataset, InputStream in, String base, Lang lang)
{
StreamRDF dest = StreamRDFLib.dataset(dataset) ;
process(dest, new TypedInputStream(in), base, lang, null) ;
}
/** Read quads into a dataset with chars from an Reader.
* Use java.io.Readers is not encouraged - use with a StringReader is the primary use case.
* For files, open a {@link java.io.FileInputStream} to ensure correct character set handling.
* @param dataset Destination
* @param in InputStream
* @param base Base URI
* @param lang Language syntax
* @deprecated use an InputStream or a StringReader.
*/
@Deprecated
public static void read(Dataset dataset, Reader in, String base, Lang lang)
{
read(dataset.asDatasetGraph(), in, base, lang) ;
}
/** Read quads into a dataset with chars from an Reader.
* Use java.io.Readers is not encouraged - use with a StringReader is the primary use case.
* For files, open a {@link java.io.FileInputStream} to ensure correct character set handling.
* @param dataset Destination
* @param in InputStream
* @param base Base URI
* @param lang Language syntax
* @deprecated use an InputStream or a StringReader.
*/
@Deprecated
public static void read(DatasetGraph dataset, Reader in, String base, Lang lang)
{
StreamRDF dest = StreamRDFLib.dataset(dataset) ;
process(dest, in, base, lang, null) ;
}
/** Read quads into a dataset with chars from a StringReader.
* Use java.io.Readers is not encouraged - use with a StringReader is the primary use case.
* For files, open a {@link java.io.FileInputStream} to ensure correct character set handling.
* @param dataset Destination
* @param in InputStream
* @param base Base URI
* @param lang Language syntax
*/
public static void read(Dataset dataset, StringReader in, String base, Lang lang)
{
read(dataset.asDatasetGraph(), in, base, lang) ;
}
/** Read quads into a dataset with chars from a StringReader.
* Use java.io.Readers is not encouraged - use with a StringReader is the primary use case.
* For files, open a {@link java.io.FileInputStream} to ensure correct character set handling.
* @param dataset Destination
* @param in InputStream
* @param base Base URI
* @param lang Language syntax
*/
public static void read(DatasetGraph dataset, StringReader in, String base, Lang lang)
{
StreamRDF dest = StreamRDFLib.dataset(dataset) ;
process(dest, in, base, lang, null) ;
}
/** Read RDF data.
* @param sink Destination for the RDF read.
* @param uri URI to read from (includes file: and a plain file name).
*/
public static void parse(StreamRDF sink, String uri)
{
parse(sink, uri, null) ;
}
/** Read RDF data.
* @param sink Destination for the RDF read.
* @param uri URI to read from (includes file: and a plain file name).
* @param lang Hint for the syntax
*/
public static void parse(StreamRDF sink, String uri, Lang lang)
{
parse(sink, uri, lang, null) ;
}
/** Read RDF data.
* @param sink Destination for the RDF read.
* @param uri URI to read from (includes file: and a plain file name).
* @param hintLang Hint for the syntax
* @param context Content object to control reading process.
*/
public static void parse(StreamRDF sink, String uri, Lang hintLang, Context context)
{
parse(sink, uri, uri, hintLang, context) ;
}
/** Read RDF data.
* @param sink Destination for the RDF read.
* @param uri URI to read from (includes file: and a plain file name).
* @param base Base URI (defaults to uri).
* @param hintLang Hint for the syntax
* @param context Content object to control reading process.
*/
public static void parse(StreamRDF sink, String uri, String base, Lang hintLang, Context context)
{
if ( uri == null )
throw new IllegalArgumentException("URI to read from is null") ;
if ( base == null )
base = SysRIOT.chooseBaseIRI(uri) ;
if ( hintLang == null )
hintLang = RDFLanguages.filenameToLang(uri) ;
TypedInputStream in = open(uri, context) ;
if ( in == null )
throw new RiotException("Not found: "+uri) ;
process(sink, in, base, hintLang, context) ;
IO.close(in) ;
}
/** Read RDF data.
* @param sink Destination for the RDF read.
* @param in Bytes to read.
* @param lang Syntax for the stream.
*/
public static void parse(StreamRDF sink, InputStream in, Lang lang)
{
parse(sink, in, null, lang, null) ;
}
/** Read RDF data.
* @param sink Destination for the RDF read.
* @param in Bytes to read.
* @param base Base URI (defaults to uri).
* @param hintLang Hint for the syntax
*/
public static void parse(StreamRDF sink, InputStream in, String base, Lang hintLang)
{
parse(sink, in, base, hintLang, null) ;
}
/** Read RDF data.
* @param sink Destination for the RDF read.
* @param in Reader
* @param base Base URI (defaults to uri).
* @param hintLang Hint for the syntax
* @param context Content object to control reading process.
*/
public static void parse(StreamRDF sink, Reader in, String base, Lang hintLang, Context context)
{
process(sink, in, base, hintLang, context) ;
}
/** Read RDF data.
* @param sink Destination for the RDF read.
* @param in Reader
* @param lang Syntax for the stream.
*/
public static void parse(StreamRDF sink, Reader in, Lang lang)
{
parse(sink, in, null, lang, null) ;
}
/** Read RDF data.
* @param sink Destination for the RDF read.
* @param in Reader
* @param base Base URI (defaults to uri).
* @param hintLang Hint for the syntax
*/
public static void parse(StreamRDF sink, Reader in, String base, Lang hintLang)
{
parse(sink, in, base, hintLang, null) ;
}
/** Read RDF data.
* @param sink Destination for the RDF read.
* @param in Bytes to read.
* @param base Base URI (defaults to uri).
* @param hintLang Hint for the syntax
* @param context Content object to control reading process.
*/
public static void parse(StreamRDF sink, InputStream in, String base, Lang hintLang, Context context)
{
process(sink, new TypedInputStream(in), base, hintLang, context) ;
}
/** Read RDF data.
* @param sink Destination for the RDF read.
* @param in Bytes to read. This must include the content type.
*/
public static void parse(StreamRDF sink, TypedInputStream in)
{
parse(sink, in, (String)null) ;
}
/** Read RDF data.
* @param sink Destination for the RDF read.
* @param in Bytes to read.
* @param base Base URI
*/
public static void parse(StreamRDF sink, TypedInputStream in, String base)
{
parse(sink, in, base, (Context)null) ;
}
/** Read RDF data.
* @param sink Destination for the RDF read.
* @param in Bytes to read.
* @param base Base URI
* @param context Content object to control reading process.
*/
public static void parse(StreamRDF sink, TypedInputStream in, String base, Context context)
{
Lang hintLang = RDFLanguages.contentTypeToLang(in.getMediaType()) ;
process(sink, new TypedInputStream(in), base, hintLang, context) ;
}
/** Open a stream to the destination (URI or filename)
* Performs content negotiation, including looking at file extension.
* @param filenameOrURI
* @return TypedInputStream
*/
public static TypedInputStream open(String filenameOrURI)
{ return open(filenameOrURI, (Context)null) ; }
/** Open a stream to the destination (URI or filename)
* Performs content negotiation, including looking at file extension.
* @param filenameOrURI
* @param context
* @return TypedInputStream
*/
public static TypedInputStream open(String filenameOrURI, Context context)
{
StreamManager sMgr = StreamManager.get() ;
if ( context != null )
{
try { sMgr = (StreamManager)context.get(streamManagerSymbol, context) ; }
catch (ClassCastException ex)
{ log.warn("Context symbol '"+streamManagerSymbol+"' is not a "+Utils.classShortName(StreamManager.class)) ; }
}
return open(filenameOrURI, sMgr) ;
}
/** Open a stream to the destination (URI or filename)
* Performs content negotiation, including looking at file extension.
* @param filenameOrURI
* @param streamManager
* @return TypedInputStream
*/
public static TypedInputStream open(String filenameOrURI, StreamManager streamManager)
{
TypedInputStream in = streamManager.open(filenameOrURI) ;
if ( in == null )
{
if ( log.isDebugEnabled() )
//log.debug("Found: "+filenameOrURI+" ("+loc.getName()+")") ;
log.debug("Not Found: "+filenameOrURI) ;
throw new RiotNotFoundException("Not found: "+filenameOrURI) ;
//return null ;
}
if ( log.isDebugEnabled() )
//log.debug("Found: "+filenameOrURI+" ("+loc.getName()+")") ;
log.debug("Found: "+filenameOrURI) ;
return in ;
}
// -----
// Readers are algorithms and must be stateless (or they must create a per run
// instance of something) because they may be called concurrency from different threads.
// The Context Readerobject gives the per-run configuration.
// Alternative: A two step factory-instance design means
// readers can be created and passed around (e,.g. to set specific features)
// We could have had two step design - ReaderFactory-ReaderInstance
// no - put the bruden on complicated readers, not everyone.
private static void process(StreamRDF destination, TypedInputStream in, String baseUri, Lang hintLang, Context context)
{
ContentType ct = determineCT(baseUri, in.getContentType(), hintLang) ;
if ( ct == null )
throw new RiotException("Failed to determine the content type: (URI="+baseUri+" : stream="+in.getContentType()+" : hint="+hintLang+")") ;
ReaderRIOT reader = getReader(ct) ;
if ( reader == null )
throw new RiotException("No parser registered for content type: "+ct.getContentType()) ;
reader.read(in, baseUri, ct, destination, context) ;
}
// java.io.Readers are NOT preferred.
private static void process(StreamRDF destination, Reader in, String baseUri, Lang lang, Context context )
{
// Not as good as from an InputStream
ContentType ct = determineCT(baseUri, null, lang) ;
if ( ct == null )
throw new RiotException("Failed to determine the content type: (URI="+baseUri+" : hint="+lang+")") ;
ReaderRIOT reader = getReader(ct) ;
if ( reader == null )
throw new RiotException("No parser registered for content type: "+ct.getContentType()) ;
reader.read(in, baseUri, ct, destination, context) ;
}
private static ReaderRIOT getReader(ContentType ct)
{
Lang lang = RDFLanguages.contentTypeToLang(ct) ;
ReaderRIOTFactory r = RDFParserRegistry.getFactory(lang) ;
if ( r == null )
return null ;
return r.create(lang) ;
}
/** Determine the Lang, given the URI target, any content type header string and a hint */
public static Lang determineLang(String target, String ctStr, Lang hintLang) {
ContentType ct = determineCT(target, ctStr, hintLang) ;
if ( ct == null )
return hintLang ;
Lang lang = RDFLanguages.contentTypeToLang(ct) ;
if (lang == null )
return hintLang ;
return lang ;
}
/** Determine the content type to be used, given the target URL, the content-type from
* Content Negotiation and a hint language. This is a pragmatic balance.
* A content-type of "text/plain" is ignored - it is too often wrong.
*/
/*package*/ static ContentType determineCT(String target, String ctStr, Lang hintLang)
{
boolean isTextPlain = WebContent.contentTypeTextPlain.equals(ctStr) ;
if ( ctStr != null )
ctStr = WebContent.contentTypeCanonical(ctStr) ;
// The decision is:
// Content type (but not text/plain) > hint > file extension.
// If it's text plain, we ignore it because a lot of naive
// server setups return text/plain for any file type.
// (It was never registered as being N-triples;
// that was only for RDF 2004 testing.)
ContentType ct = null ;
if ( ! isTextPlain )
// Not guaranteed to be registered as a language here.
ct = (ctStr==null) ? null : ContentType.create(ctStr) ;
if ( ct == null && hintLang != null )
ct = hintLang.getContentType() ;
if ( ct == null )
ct = RDFLanguages.guessContentType(target) ;
return ct ;
}
// -------- WRITERS
/** Write the model to the output stream in the default serialization for the language.
* @param out OutputStream
* @param model Graph to write
* @param lang Language for the seralization.
*/
public static void write(OutputStream out, Model model, Lang lang)
{
write(out, model.getGraph(), lang) ;
}
/** Write the model to the output stream in the default serialization for the language.
* @param out OutputStream
* @param model Model to write
* @param serialization Serialization format
*/
public static void write(OutputStream out, Model model, RDFFormat serialization)
{
write(out, model.getGraph(), serialization) ;
}
/** Write the graph to the output stream in the default serialization for the language.
* @param out StringWriter
* @param model Model to write
* @param lang Serialization format
*/
public static void write(StringWriter out, Model model, Lang lang)
{
write(out, model.getGraph(), lang) ;
}
/** Write the graph to the output stream in the default serialization for the language.
* @param out Writer
* @param model Model to write
* @param lang Serialization format
* @deprecated Use of writers is deprecated - use an OutputStream
*/
@Deprecated
public static void write(Writer out, Model model, Lang lang)
{
write(out, model.getGraph(), lang) ;
}
/** Write the graph to the output stream in the default serialization for the language.
* @param out StringWriter
* @param model Model to write
* @param serialization Serialization format
*/
public static void write(StringWriter out, Model model, RDFFormat serialization)
{
write(out, model.getGraph(), serialization) ;
}
/** Write the graph to the output stream in the default serialization for the language.
* @param out OutputStream
* @param model Model to write
* @param serialization Serialization format
* @deprecated Use of writers is deprecated - use an OutputStream
*/
@Deprecated
public static void write(Writer out, Model model, RDFFormat serialization)
{
write(out, model.getGraph(), serialization) ;
}
/** Write the graph to the output stream in the default serialization for the language.
* @param out OutputStream
* @param graph Graph to write
* @param lang Language for the seralization.
*/
public static void write(OutputStream out, Graph graph, Lang lang)
{
RDFFormat serialization = RDFWriterRegistry.defaultSerialization(lang) ;
write(out, graph, serialization) ;
}
/** Write the graph to the output stream in the default serialization for the language.
* @param out OutputStream
* @param graph Graph to write
* @param serialization Serialization format
*/
public static void write(OutputStream out, Graph graph, RDFFormat serialization)
{
write$(out, graph, serialization) ;
}
/** Write the graph to the output stream in the default serialization for the language.
* @param out StringWriter
* @param graph Graph to write
* @param lang Serialization format
*/
public static void write(StringWriter out, Graph graph, Lang lang)
{
// Only known reasonable use of a Writer
write$(out, graph, RDFWriterRegistry.defaultSerialization(lang)) ;
}
/** Write the graph to the output stream in the default serialization for the language.
* @param out Writer
* @param graph Graph to write
* @param lang Serialization format
* @deprecated Use of writers is deprecated - use an OutputStream
*/
@Deprecated
public static void write(Writer out, Graph graph, Lang lang)
{
write$(out, graph, RDFWriterRegistry.defaultSerialization(lang)) ;
}
/** Write the graph to the output stream in the default serialization for the language.
* @param out OutputStream
* @param graph Graph to write
* @param serialization Serialization format
*/
public static void write(StringWriter out, Graph graph, RDFFormat serialization)
{
// Only known reasonable use of a Writer
write$(out, graph, serialization) ;
}
/** Write the graph to the output stream in the default serialization for the language.
* @param out OutputStream
* @param graph Graph to write
* @param serialization Serialization format
* @deprecated Use of writers is deprecated - use an OutputStream
*/
@Deprecated
public static void write(Writer out, Graph graph, RDFFormat serialization)
{
write$(out, graph, serialization) ;
}
/** Write the Dataset to the output stream in the default serialization for the language.
* @param out OutputStream
* @param dataset Dataset to write
* @param lang Language for the seralization.
*/
public static void write(OutputStream out, Dataset dataset, Lang lang)
{
write(out, dataset.asDatasetGraph(), lang) ;
}
/** Write the graph to the output stream in the default serialization for the language.
* @param out OutputStream
* @param dataset Dataset to write
* @param serialization Serialization format
*/
public static void write(OutputStream out, Dataset dataset, RDFFormat serialization)
{
write(out, dataset.asDatasetGraph(), serialization) ;
}
/** Write the graph to the output stream in the default serialization for the language.
* @param out Writer
* @param dataset Dataset to write
* @param serialization Serialization format
*/
public static void write(StringWriter out, Dataset dataset, RDFFormat serialization)
{
write$(out, dataset.asDatasetGraph(), serialization) ;
}
/** Write the graph to the output stream in the default serialization for the language.
* @param out StringWriter
* @param dataset Dataset to write
* @param lang Language for the seralization.
*/
public static void write(StringWriter out, Dataset dataset, Lang lang)
{
RDFFormat serialization = RDFWriterRegistry.defaultSerialization(lang) ;
write$(out, dataset.asDatasetGraph(), serialization) ;
}
/** Write the graph to the output stream in the default serialization for the language.
* @param out Writer
* @param dataset Dataset to write
* @param serialization Serialization format
* @deprecated Use of writers is deprecated - use an OutputStream
*/
@Deprecated
public static void write(Writer out, Dataset dataset, RDFFormat serialization)
{
write$(out, dataset.asDatasetGraph(), serialization) ;
}
/** Write the DatasetGraph to the output stream in the default serialization for the language.
* @param out OutputStream
* @param dataset DatasetGraph to write
* @param lang Language for the seralization.
*/
public static void write(OutputStream out, DatasetGraph dataset, Lang lang)
{
RDFFormat serialization = RDFWriterRegistry.defaultSerialization(lang) ;
write(out, dataset, serialization) ;
}
/** Write the graph to the output stream in the default serialization for the language.
* @param out OutputStream
* @param dataset DatasetGraph to write
* @param serialization Serialization format
*/
public static void write(OutputStream out, DatasetGraph dataset, RDFFormat serialization)
{
write$(out, dataset, serialization) ;
}
/** Write the DatasetGraph to the output stream in the default serialization for the language.
* @param out StringWriter
* @param dataset DatasetGraph to write
* @param lang Language for the seralization.
*/
public static void write(StringWriter out, DatasetGraph dataset, Lang lang)
{
RDFFormat serialization = RDFWriterRegistry.defaultSerialization(lang) ;
write(out, dataset, serialization) ;
}
/** Write the graph to the output stream in the default serialization for the language.
* @param out StringWriter
* @param dataset DatasetGraph to write
* @param serialization Serialization format
*/
public static void write(StringWriter out, DatasetGraph dataset, RDFFormat serialization)
{
write$(out, dataset, serialization) ;
}
/** Write the graph to the output stream in the default serialization for the language.
* @param out Writer
* @param dataset DatasetGraph to write
* @param serialization Serialization format
* @deprecated Use of writers is deprecated - use an OutputStream
*/
@Deprecated
public static void write(Writer out, DatasetGraph dataset, RDFFormat serialization)
{
write$(out, dataset, serialization) ;
}
/** Write an iterator of triples (in N-Triples)
* @param out
* @param iterator
*/
public static void writeTriples(OutputStream out, Iterator iterator)
{
NTriplesWriter.write(out, iterator) ;
}
/** Write an iterator of quads (in N-Quads)
* @param out
* @param iterator
*/
public static void writeQuads(OutputStream out, Iterator iterator)
{
NQuadsWriter.write(out, iterator) ;
}
/** Create a writer for an RDF language
* @param lang Language for the seralization.
* @return WriterGraphRIOT
*/
public static WriterGraphRIOT createGraphWriter(Lang lang)
{
RDFFormat serialization = RDFWriterRegistry.defaultSerialization(lang) ;
return createGraphWriter$(serialization) ;
}
/** Create a writer for an RDF language
* @param serialization Serialization format
* @return WriterGraphRIOT
*/
public static WriterGraphRIOT createGraphWriter(RDFFormat serialization)
{
return createGraphWriter$(serialization) ;
}
/** Create a writer for an RDF language
* @param lang Language for the seralization.
* @return WriterGraphRIOT
*/
public static WriterDatasetRIOT createDatasetWriter(Lang lang)
{
RDFFormat serialization = RDFWriterRegistry.defaultSerialization(lang) ;
return createDatasetWriter$(serialization) ;
}
/** Create a writer for an RDF language
* @param serialization Serialization format
* @return WriterGraphRIOT
*/
public static WriterDatasetRIOT createDatasetWriter(RDFFormat serialization)
{
return createDatasetWriter$(serialization) ;
}
private static WriterGraphRIOT createGraphWriter$(RDFFormat serialization)
{
WriterGraphRIOTFactory wf = RDFWriterRegistry.getWriterGraphFactory(serialization) ;
if ( wf == null )
throw new RiotException("No graph writer for "+serialization) ;
return wf.create(serialization) ;
}
private static WriterDatasetRIOT createDatasetWriter$(RDFFormat serialization)
{
WriterDatasetRIOTFactory wf = RDFWriterRegistry.getWriterDatasetFactory(serialization) ;
if ( wf == null )
throw new RiotException("No dataset writer for "+serialization) ;
return wf.create(serialization) ;
}
private static void write$(OutputStream out, Graph graph, RDFFormat serialization)
{
WriterGraphRIOT w = createGraphWriter$(serialization) ;
w.write(out, graph, RiotLib.prefixMap(graph), null, null) ;
}
private static void write$(Writer out, Graph graph, RDFFormat serialization)
{
WriterGraphRIOT w = createGraphWriter$(serialization) ;
w.write(out, graph, RiotLib.prefixMap(graph), null, null) ;
}
private static void write$(OutputStream out, DatasetGraph dataset, RDFFormat serialization)
{
WriterDatasetRIOT w = createDatasetWriter$(serialization) ;
w.write(out, dataset, RiotLib.prefixMap(dataset), null, null) ;
}
private static void write$(Writer out, DatasetGraph dataset, RDFFormat serialization)
{
WriterDatasetRIOT w = createDatasetWriter$(serialization) ;
w.write(out, dataset, RiotLib.prefixMap(dataset), null, null) ;
}
}
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