/**
* 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.system;
import java.util.Iterator ;
import org.apache.jena.graph.Graph ;
import org.apache.jena.graph.Triple ;
import org.apache.jena.shared.PrefixMapping ;
import org.apache.jena.sparql.core.DatasetGraph ;
import org.apache.jena.sparql.core.Quad ;
/* TODO
* Split up StreamRDFLib into factory and operations
* Check start/finish policies.
* org.apache.jena.riot.stream?
*
*/
/** Utilities for sending to StreamRDF.
* Unless otherwise stated, send* operations do not call stream.start()/stream.finish()
* whereas other operations do.
*/
public class StreamOps {
/** Send a dataset to a StreamRDF as prefixes, triples and quads, enclosed in stream.start()/steram.finish() */
public static void datasetToStream(DatasetGraph datasetGraph, StreamRDF stream) {
stream.start() ;
sendDatasetToStream(datasetGraph, stream) ;
stream.finish() ;
}
/** Send the triples of graph and it's prefix mapping to a StreamRDF, enclosed in stream.start()/steram.finish() */
public static void graphToStream(Graph graph, StreamRDF stream) {
stream.start();
sendGraphToStream(graph, stream) ;
stream.finish() ;
}
/** Send a PrefixMap to a stream */
public static void sendPrefixesToStream(PrefixMap prefixMap, StreamRDF stream) {
prefixMap.forEach((p,u) -> stream.prefix(p, u.toString())) ;
}
public static void sendPrefixesToStream(PrefixMapping prefixMap, StreamRDF stream) {
prefixMap.getNsPrefixMap().forEach(stream::prefix);
}
/** Send a dataset graph to a stream with triples for the default graph
* and quads for the named graphs without prefixes
*/
public static void sendTriplesQuadsToStream(DatasetGraph datasetGraph, StreamRDF stream) {
sendDatasetToStream(datasetGraph, stream, null) ;
}
/** Send a dataset to a StreamRDF as prefixes, triples and quads */
public static void sendDatasetToStream(DatasetGraph datasetGraph, StreamRDF stream) {
PrefixMap prefixMap = PrefixMapFactory.create(datasetGraph.getDefaultGraph().getPrefixMapping()) ;
sendDatasetToStream(datasetGraph, stream, prefixMap) ;
}
//
// /** Send a dataset to a StreamRDF as triples and quads, using the explicitly given prefix map */
// public static void datasetToStream(DatasetGraph datasetGraph, StreamRDF stream, PrefixMap prefixMap) {
//
// }
//
/** Send a dataset to a StreamRDF as triples and quads, using the explicitly given prefix map */
public static void sendDatasetToStream(DatasetGraph datasetGraph, StreamRDF stream, PrefixMap prefixMap) {
if ( prefixMap != null )
sendPrefixesToStream(prefixMap, stream) ;
// Default graph
Iterator<Triple> iter1 = datasetGraph.getDefaultGraph().find(null, null, null) ;
StreamOps.sendTriplesToStream(iter1, stream) ;
Iterator<Quad> iter2 = datasetGraph.findNG(null, null, null, null) ;
StreamOps.sendQuadsToStream(iter2, stream) ;
}
/** Send the triples of graph and an explicitly given prefix mapping, to a StreamRDF */
public static void sendGraphToStream(Graph graph, StreamRDF stream) {
PrefixMap prefixMap = PrefixMapFactory.create(graph.getPrefixMapping()) ;
sendGraphToStream(graph, stream, prefixMap) ;
}
/** Send the triples of graph and an explicitly given prefix mapping, to a StreamRDF */
public static void sendGraphToStream(Graph graph, StreamRDF stream, PrefixMap prefixMap) {
if ( prefixMap != null )
sendPrefixesToStream(prefixMap, stream) ;
Iterator<Triple> iter = graph.find(null, null, null) ;
StreamOps.sendTriplesToStream(iter, stream) ;
}
/** Send the triples of graph to a StreamRDF (no prefix mapping) */
public static void sendTriplesToStream(Graph graph, StreamRDF stream) {
sendGraphToStream(graph, stream, null) ;
}
/** Set triples to a StreamRDF - does not call .start/.finish */
public static void sendTriplesToStream(Iterator<Triple> iter, StreamRDF dest)
{
for ( ; iter.hasNext() ; )
{
Triple t = iter.next() ;
dest.triple(t) ;
}
}
/** Send quads of a dataset (including default graph as quads) to a StreamRDF, without prefixes */
public static void sendQuadsToStream(DatasetGraph datasetGraph, StreamRDF stream) {
Iterator<Quad> iter2 = datasetGraph.find(null, null, null, null) ;
StreamOps.sendQuadsToStream(iter2, stream) ;
}
/** Set quads to a StreamRDF - does not call .start/.finish */
public static void sendQuadsToStream(Iterator<Quad> iter, StreamRDF dest)
{
for ( ; iter.hasNext() ; )
{
Quad q = iter.next() ;
dest.quad(q) ;
}
}
}