org.eclipse.rdf4j.query

Interface Operation

All Known Subinterfaces:

BooleanQuery, GraphQuery, Query, TupleQuery, Update

All Known Implementing Classes:

AbstractHTTPQuery, AbstractHTTPUpdate, AbstractOperation, AbstractParserQuery, AbstractParserQuery, AbstractParserUpdate, AbstractParserUpdate, AbstractQuery, AbstractUpdate, FedXBooleanQuery, FedXGraphQuery, FedXTupleQuery, HTTPBooleanQuery, HTTPGraphQuery, HTTPTupleQuery, HTTPUpdate, SailBooleanQuery, SailConnectionBooleanQuery, SailConnectionGraphQuery, SailConnectionQuery, SailConnectionTupleQuery, SailConnectionUpdate, SailGraphQuery, SailQuery, SailTupleQuery, SailUpdate, SPARQLBooleanQuery, SPARQLGraphQuery, SPARQLOperation, SPARQLTupleQuery, SPARQLUpdate

public interface Operation

An operation (e.g. a query or an update) on a repository that can be formulated in one of the supported query languages (for example SeRQL or SPARQL). It allows one to predefine bindings in the operation to be able to reuse the same operation with different bindings.

Author:

Jeen

Method Summary

Modifier and Type	Method and Description
void	clearBindings() Removes all previously set bindings.
BindingSet	getBindings() Retrieves the bindings that have been set on this operation.
Dataset	getDataset() Gets the dataset that has been set using setDataset(Dataset), if any.
boolean	getIncludeInferred() Returns whether or not this operation will return inferred statements (if any are present in the repository).
int	getMaxExecutionTime() Returns the maximum operation execution time.
void	removeBinding(String name) Removes a previously set binding on the supplied variable.
void	setBinding(String name, Value value) Binds the specified variable to the supplied value.
void	setDataset(Dataset dataset) Specifies the dataset against which to execute an operation, overriding any dataset that is specified in the operation itself.
void	setIncludeInferred(boolean includeInferred) Determine whether evaluation results of this operation should include inferred statements (if any inferred statements are present in the repository).
void	setMaxExecutionTime(int maxExecTime) Specifies the maximum time that an operation is allowed to run.

Method Detail

setBinding

void setBinding(String name,
                Value value)

Binds the specified variable to the supplied value. Any value that was previously bound to the specified value will be overwritten.

Parameters:

name - The name of the variable that should be bound.

value - The (new) value for the specified variable.

removeBinding

void removeBinding(String name)

Removes a previously set binding on the supplied variable. Calling this method with an unbound variable name has no effect.

Parameters:

name - The name of the variable from which the binding is to be removed.

clearBindings

void clearBindings()

Removes all previously set bindings.

getBindings

BindingSet getBindings()

Retrieves the bindings that have been set on this operation.

Returns:

A (possibly empty) set of operation variable bindings.

See Also:

setBinding(String, Value)

setDataset

void setDataset(Dataset dataset)

Specifies the dataset against which to execute an operation, overriding any dataset that is specified in the operation itself.

getDataset

Dataset getDataset()

Gets the dataset that has been set using setDataset(Dataset), if any.

setIncludeInferred

void setIncludeInferred(boolean includeInferred)

Determine whether evaluation results of this operation should include inferred statements (if any inferred statements are present in the repository). The default setting is 'true'.

Parameters:

includeInferred - indicates whether inferred statements should be included in the result.

getIncludeInferred

boolean getIncludeInferred()

Returns whether or not this operation will return inferred statements (if any are present in the repository).

Returns:

true if inferred statements will be returned, false otherwise.

setMaxExecutionTime

void setMaxExecutionTime(int maxExecTime)

Specifies the maximum time that an operation is allowed to run. The operation will be interrupted when it exceeds the time limit. Any consecutive requests to fetch query results will result in QueryInterruptedExceptions or UpdateExecutionExceptions (depending on whether the operation is a query or an update).

Parameters:

maxExecTime - The maximum query time, measured in seconds. A negative or zero value indicates an unlimited execution time (which is the default).

getMaxExecutionTime

int getMaxExecutionTime()

Returns the maximum operation execution time.

Returns:

The maximum operation execution time, measured in seconds.

See Also:

setMaxExecutionTime(int)