org.openrdf.sesame.sail.query
Class GraphPatternQuery

java.lang.Object
  org.openrdf.sesame.sail.query.GraphPatternQuery

All Implemented Interfaces:

Query

Direct Known Subclasses:

ConstructQuery, SelectQuery

public abstract class GraphPatternQuery

extends Object

implements Query

An abstract representation of an RDF query that works with path expressions.

Author:

Arjan Kleine, Jeen Broekstra, Arjohn Kampman

Method Summary

void	evaluate(RdfSource rdfSource, QueryAnswerListener listener) Evaluates the query on the data contained in the supplied RdfSource and reports the results to the supplied QueryAnswerListener.
GraphPattern	getGraphPattern()
int	getLimit()
int	getOffset()
abstract void	getProjectionVariables(Collection variables) Gets all variables that are used in the projection of this GraphPatternQuery.
void	getVariables(Collection variables) Gets all variables that are used in this query.
boolean	hasLimit()
boolean	hasOffset()
boolean	isDistinct()
void	setDistinct(boolean distinct)
void	setGraphPattern(GraphPattern graphPattern)
void	setLimit(int limit)
void	setOffset(int offset)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.openrdf.sesame.sail.query.Query

getColumnHeaders

Method Detail

isDistinct

public boolean isDistinct()

setDistinct

public void setDistinct(boolean distinct)

getOffset

public int getOffset()

hasOffset

public boolean hasOffset()

setOffset

public void setOffset(int offset)

getLimit

public int getLimit()

hasLimit

public boolean hasLimit()

setLimit

public void setLimit(int limit)

setGraphPattern

public void setGraphPattern(GraphPattern graphPattern)

getGraphPattern

public GraphPattern getGraphPattern()

getVariables

public void getVariables(Collection variables)

Description copied from interface: Query

Gets all variables that are used in this query.

Specified by:

getVariables in interface Query

Parameters:

variables - A Collection to add the Var objects to.

getProjectionVariables

public abstract void getProjectionVariables(Collection variables)

Gets all variables that are used in the projection of this GraphPatternQuery.

Parameters:

variables - A Collection to add the Var objects to.

evaluate

public void evaluate(RdfSource rdfSource,
                     QueryAnswerListener listener)
              throws SailQueryException

Description copied from interface: Query

Evaluates the query on the data contained in the supplied RdfSource and reports the results to the supplied QueryAnswerListener.

Specified by:

evaluate in interface Query

Parameters:

rdfSource - An RdfSource containing the data to evaluate the query on.

listener - A QueryAnswerListener that will receive any query results.

Throws:

SailQueryException - An exception indicating that the query evaluation was stopped abnormally.