gate.creole.ontology

Interface OntologyBooleanQuery

public interface OntologyBooleanQuery

This represents a boolean query of the triple store for the ontology. To create a boolean query object you must use the ontology's factory method Ontology.createBooleanQuery(String, gate.creole.ontology.OConstants.QueryLanguage).

NOTE: querying the ontology triple store directly should be avoided and only done in exceptional cases. Using the methods to query and access ontology entities should be preferred whenever possible!

Author:

Johann Petrak

Method Summary

Modifier and Type	Method and Description
boolean	evaluate() Evaluate the boolean query and return whether it evaluates to true or false;
void	setBinding(String varName, Literal value) Re-assign a query variable to a new value.
void	setBinding(String varName, LiteralOrONodeID value) Re-assign a query variable to a new value.
void	setBinding(String varName, ONodeID value) Re-assign a query variable to a new value.

Method Detail

setBinding

void setBinding(String varName,
                LiteralOrONodeID value)

Re-assign a query variable to a new value. This will let you query the triple store with the same query but a different value for the variable. Depending on the implementation, this might avoid the necessity to recompile the whole query.

Parameters:

varName - - the name of the variable to be reassigned

value - - a LiteralOrONodeID object representing either a literal or either an URI or a blank node identifier.

setBinding

void setBinding(String varName,
                ONodeID value)

Re-assign a query variable to a new value. This will let you query the triple store with the same query but a different value for the variable. Depending on the implementation, this might avoid the necessity to recompile the whole query.

Parameters:

varName - - the name of the variable to be reassigned

value - - a ONodeID object (usually a OURI object)

setBinding

void setBinding(String varName,
                Literal value)

Re-assign a query variable to a new value. This will let you query the triple store with the same query but a different value for the variable. Depending on the implementation, this might avoid the necessity to recompile the whole query.

Parameters:

varName - - the name of the variable to be reassigned

value - - a Literal object

evaluate

boolean evaluate()

Evaluate the boolean query and return whether it evaluates to true or false;

Returns:

- a boolean representing the result of the boolean query