Java Context类代码示例

import org.apache.jena.sparql.util.Context; //导入依赖的package包/类
public NodeValue exec(NodeValue prefix, Context context) {
	if (prefix == null) {
		return null;
	}
	if (!prefix.isString()) {
		throw new ExprEvalException(NAME + ": not a string: " + prefix);
	}
	PrefixMapping prefixes = context.get(PREFIX_MAPPING);
	if (prefixes == null) {
		throw new ExprEvalException(NAME + ": no prefix mapping registered");
	}
	String iri = prefixes.getNsPrefixURI(prefix.asString());
	if (iri == null) {
		throw new ExprEvalException(NAME + ": prefix not defined: " + prefix);
	}
	return NodeValue.makeString(iri);
}
 

import org.apache.jena.sparql.util.Context; //导入依赖的package包/类
public static void addValueNodes(RDFNode focusNode, Path path, Collection<RDFNode> results) {
	Set<Node> seen = new HashSet<>();
	Iterator<Node> it = PathEval.eval(focusNode.getModel().getGraph(), focusNode.asNode(), path, Context.emptyContext);
	while(it.hasNext()) {
		Node node = it.next();
		if(!seen.contains(node)) {
			seen.add(node);
			results.add(focusNode.getModel().asRDFNode(node));
		}
	}
}
 

import org.apache.jena.sparql.util.Context; //导入依赖的package包/类
@Override
public UpdateEngine create(DatasetGraph datasetGraph, Binding inputBinding,
        Context context) {
    MarkLogicUpdateEngine engine = new MarkLogicUpdateEngine(
            datasetGraph, inputBinding, context);
    return engine;
}
 

import org.apache.jena.sparql.util.Context; //导入依赖的package包/类
public MarkLogicUpdateEngineWorker(DatasetGraph graphStore,
        Binding inputBinding, Context context) {
    if (!(graphStore instanceof MarkLogicDatasetGraph)) {
        throw new MarkLogicJenaException(
                "UpdateVisitor created with incorrect GraphStore implementation");
    } else {
        this.markLogicDatasetGraph = (MarkLogicDatasetGraph) graphStore;
        this.initial = inputBinding;
        this.client = markLogicDatasetGraph.getDatabaseClient();
    }
}
 

import org.apache.jena.sparql.util.Context; //导入依赖的package包/类
/**
 * Constructor.
 * @param query A Jena Query.  This engine does not use all parts of the Query hierarchy.
 * @param datasetGraph The MarkLogic instance viewed through Jena. Must be a MarkLogicDatasetGraph. 
 * @param initial Bindings for the query.
 * @param context
 */
private MarkLogicQueryEngine(Query query, DatasetGraph datasetGraph,
        Binding initial, Context context) {
    super(query, datasetGraph, initial, context);
    bgp = new BasicPattern();
    bgp.add(new Triple(
            Var.alloc("s"), 
            Var.alloc("p"), 
            Var.alloc("o")));
    template = new Template(bgp);
    this.markLogicDatasetGraph = (MarkLogicDatasetGraph) datasetGraph;
    this.initial = initial;
}
 

import org.apache.jena.sparql.util.Context; //导入依赖的package包/类
@Test
public void createEntity() throws Exception {
    Individual ent = provModel.createEntity(URI
            .create("http://example.com/fred#test"));
    provModel.createEntity(URI.create("http://example.com/test"));
    OntModel model = provModel.model;
    model.write(System.out, "TURTLE", "http://example.com/fred");
    model.write(System.out, "RDF/XML", "http://example.com/fred");

    WriterGraphRIOT writer = RDFDataMgr.createGraphWriter(RDFFormat.TURTLE_BLOCKS);
    writer.write(System.out, model.getBaseModel().getGraph(), RiotLib.prefixMap(model.getGraph()), "http://example.com/fred", new Context());

}
 

import org.apache.jena.sparql.util.Context; //导入依赖的package包/类
public LinkedDataFragmentEngine(Query query, DatasetGraph dataset, Binding input, Context context)
{
    super(query, dataset, input, context) ;
    this.ldfQuery = query;
    this.ldfDataset = dataset;
    this.ldfBinding = input;
    this.ldfContext = context;
}
 

import org.apache.jena.sparql.util.Context; //导入依赖的package包/类
@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) ;
}
 

import org.apache.jena.sparql.util.Context; //导入依赖的package包/类
@Override
public QueryIterator eval(Op op, DatasetGraph dsg, Binding initial, Context context)
{
    // Extension point: access possible to all the parameters for execution.
    // Be careful to deal with initial bindings.
    Transform transform = new MyTransform() ;
    op = Transformer.transform(transform, op) ;
    return super.eval(op, dsg, initial, context) ;
}
 

import org.apache.jena.sparql.util.Context; //导入依赖的package包/类
@Override
public Plan create(Query query, DatasetGraph dataset, Binding initial, Context context)
{
    // Create a query engine instance.
    MyQueryEngine engine = new MyQueryEngine(query, dataset, initial, context) ;
    return engine.getPlan() ;
}
 

import org.apache.jena.sparql.util.Context; //导入依赖的package包/类
public NodeValue exec(NodeValue name, Context context) {
	if (name == null) return null;
	if (!name.isString()) throw new ExprEvalException("Not a string: " + name);
	PrefixMapping prefixes = context.get(ExpandPrefixFunction.PREFIX_MAPPING);
	if (prefixes == null) throw new ExprEvalException("No prefix mapping registered");
	String pname = name.asString();
	int idx = pname.indexOf(':');
	if (idx == -1) throw new ExprEvalException("Not a prefixed name: " + name);
	String prefix = pname.substring(0, idx);
	String iri = prefixes.getNsPrefixURI(prefix);
	if (iri == null) throw new ExprEvalException("Prefix not defined: " + prefix);
	return NodeValue.makeNode(NodeFactory.createURI(iri + pname.substring(idx + 1)));
}
 

import org.apache.jena.sparql.util.Context; //导入依赖的package包/类
@Override
    public Object open(Assembler a, Resource root, Mode mode) {
        // delta:changes.
        if ( ! exactlyOneProperty(root, pDeltaChanges) )
            throw new AssemblerException(root, "No destination for changes given") ;
        String destURL = getAsStringValue(root, pDeltaChanges);
        // Future - multiple outputs.
        List<String> xs = Arrays.asList(destURL);

        // delta:zone.
        if ( ! exactlyOneProperty(root, pDeltaZone) )
            throw new AssemblerException(root, "No location for state manangement (zone)") ;
        String zoneLocation = getAsStringValue(root, pDeltaZone);

        // Name of the patch log.
        // delta:patchlog
        if ( ! exactlyOneProperty(root, pDeltaPatchLog) )
            throw new AssemblerException(root, "No patch log name") ;
        String dsName = getAsStringValue(root, pDeltaPatchLog);

        // delta:storage
        if ( ! exactlyOneProperty(root, pDeltaChanges) )
            throw new AssemblerException(root, "No location for state manangement (zone)") ;
        String storageTypeStr = getAsStringValue(root, pDeltaStorage);
        LocalStorageType storage = LocalStorageType.fromString(storageTypeStr);
        if ( storage == null )
            throw new AssemblerException(root, "Unrecognized storage type '"+storageTypeStr+"'");
        
        // Build the RDFChanges: URLs to send each patch log entry. 
        RDFChanges streamChanges = null ;
        for ( String dest : xs ) {
            FmtLog.info(log, "Destination: '%s'", dest) ;
            RDFChanges sc = DeltaLib.destination(dest);
            streamChanges = RDFChangesN.multi(streamChanges, sc) ;
        }
        
        // Link to log server.
        DeltaLink deltaLink = DeltaLinkHTTP.connect(destURL);
        // Touch server
        Id clientId = Id.create();
        deltaLink.register(clientId);

        // Create.connect the local copy.
        Zone zone = Zone.connect(zoneLocation);

        // Local client.
        DeltaClient deltaClient = DeltaClient.create(zone, deltaLink);
        Id dsRef =  setup(deltaClient, dsName, "delta:"+dsName, storage);
        DeltaConnection deltaConnection = deltaClient.get(dsRef);
        DatasetGraph dsg = deltaConnection.getDatasetGraph();

        // This DatasetGraph syncs on transaction so it happens, and assumes, a transaction for any Fuseki operation. 
        // And someday tap into services to add a "sync before operation" step.

        //  Poll for changes as well.
//        if ( root.hasProperty(pPollForChanges) ) {
//            if ( ! exactlyOneProperty(root, pPollForChanges) )
//                throw new AssemblerException(root, "Multiple places to poll for chnages") ;
//            String source = getStringValue(root, pPollForChanges) ;
//            forkUpdateFetcher(source, dsgSub) ;
//        }
        
       // Put state into dsg Context "for the record".
       Context cxt = dsg.getContext();
       cxt.set(symDeltaClient, deltaClient);
       cxt.set(symDeltaConnection, deltaConnection);
       cxt.set(symDeltaZone, zone);
        
       return DatasetFactory.wrap(dsg);
    }
 

import org.apache.jena.sparql.util.Context; //导入依赖的package包/类
public static IteratorFunctionRegistry get(Context context)
{
    if ( context == null )
        return null ;
    return (IteratorFunctionRegistry) context.get(SPARQLGenerateConstants.registryIterators) ;
}
 

import org.apache.jena.sparql.util.Context; //导入依赖的package包/类
public static void set(Context context, IteratorFunctionRegistry reg)
{
    context.set(SPARQLGenerateConstants.registryIterators, reg) ;
}
 

import org.apache.jena.sparql.util.Context; //导入依赖的package包/类
@Override
public Context getContext() {
	return delegate.getContext();
}