Package org.eclipse.rdf4j.federated.util

Class FedXUtil

java.lang.Object

org.eclipse.rdf4j.federated.util.FedXUtil

public class FedXUtil
extends Object

General utility functions

Since:

5.0

Author:

Andreas Schwarte

Constructor Summary

Constructors

Constructor	Description
FedXUtil()

Method Summary

Modifier and Type	Method	Description
static void	applyMaxQueryExecutionTime(Operation operation, FederationContext federationContext)	Set a maximum execution time corresponding to FedXConfig.getEnforceMaxQueryTime() to this operation.
static void	applyQueryBindings(SailQuery query)	Apply query bindings to transfer information from the query into the evaluation routine, e.g.
static String	getIncrementalUUID()	Hexadecimal representation of an incremental integer.
static IRI	iri(String iri)
static Literal	literal(String literal)
static Resource[]	toContexts(StatementPattern stmt, Dataset dataset)	Retrieve the contexts from the StatementPattern and Dataset.
static Resource[]	toContexts(Dataset ds)	Convert the given Dataset to an array of contexts
static Dataset	toDataset(Resource[] contexts)	Convert the given contexts to a Dataset representation.
static Dataset	toDataset(StatementPattern stmt, Dataset dataset)	Returns a Dataset representation of the given StatementPattern and Dataset.
static ValueFactory	valueFactory()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FedXUtil

public FedXUtil()

Method Detail

iri

public static IRI iri(String iri)

Parameters:

iri -

Returns:

the IRI for the full URI string

literal

public static Literal literal(String literal)

Parameters:

literal -

Returns:

the string literal

valueFactory

public static ValueFactory valueFactory()

Returns:

a SimpleValueFactory instance

applyQueryBindings

public static void applyQueryBindings(SailQuery query)

Apply query bindings to transfer information from the query into the evaluation routine, e.g. the query execution time.

Parameters:

query -

getIncrementalUUID

public static String getIncrementalUUID()

Hexadecimal representation of an incremental integer.

Returns:

an incremental hex UUID

applyMaxQueryExecutionTime

public static void applyMaxQueryExecutionTime(Operation operation,
                                              FederationContext federationContext)

Set a maximum execution time corresponding to FedXConfig.getEnforceMaxQueryTime() to this operation. Note that this is an upper bound only as FedX applies other means for evaluation the maximum query execution time.

Parameters:

operation - the Operation

federationContext - the FederationContext

toDataset

public static Dataset toDataset(Resource[] contexts)

Convert the given contexts to a Dataset representation.

Parameters:

contexts -

Returns:

toContexts

public static Resource[] toContexts(Dataset ds)

Convert the given Dataset to an array of contexts

Parameters:

ds -

Returns:

toContexts

public static Resource[] toContexts(StatementPattern stmt,
                                    Dataset dataset)

Retrieve the contexts from the StatementPattern and Dataset.

Parameters:

stmt -

dataset -

Returns:

toDataset

public static Dataset toDataset(StatementPattern stmt,
                                Dataset dataset)

Returns a Dataset representation of the given StatementPattern and Dataset.

If the StatementPattern does not have a context value, the Dataset is returned as-is, which may also be null.

Otherwise the newly constructed Dataset contains all information from the original one plus the context from the statement.

Parameters:

stmt -

dataset -

Returns: