com.bigdata.rdf.sparql.ast

Class EmptySolutionSetStats

java.lang.Object

com.bigdata.rdf.sparql.ast.EmptySolutionSetStats

All Implemented Interfaces:

ISolutionSetStats

public class EmptySolutionSetStats
extends Object
implements ISolutionSetStats

An object which mocks the statistics for a single empty solution set. This is used to make some of the unit tests happy which were written before the ISolutionSetStats interface was introduced.

Version:

$Id$

Author:

Bryan Thompson

Field Summary

Fields

Modifier and Type	Field and Description
static ISolutionSetStats	INSTANCE

Method Summary

Methods

Modifier and Type	Method and Description
Set<IVariable<?>>	getAlwaysBound() Return the subset of the variables which are bound in all solutions.
Map<IVariable<?>,IConstant<?>>	getConstants() The set of variables which are effective constants (they are bound in every solution and always to the same value) together with their constant bindings.
Set<IVariable<?>>	getMaterialized() Return the subset of the variables which are materialized in all solutions in which they appear (the variables do not have to be bound in every solution, but if they are bound then their IVCache association is always set).
Set<IVariable<?>>	getNotAlwaysBound() Return the subset of the variables which are NOT bound in all solutions.
long	getSolutionSetSize() Return the #of solutions.
Set<IVariable<?>>	getUsedVars() Return the set of variables which in at least one solution.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final ISolutionSetStats INSTANCE

Method Detail

getSolutionSetSize

public long getSolutionSetSize()

Description copied from interface: ISolutionSetStats

Return the #of solutions.

Specified by:

getSolutionSetSize in interface ISolutionSetStats

getUsedVars

public Set<IVariable<?>> getUsedVars()

Description copied from interface: ISolutionSetStats

Return the set of variables which in at least one solution.

Specified by:

getUsedVars in interface ISolutionSetStats

getAlwaysBound

public Set<IVariable<?>> getAlwaysBound()

Description copied from interface: ISolutionSetStats

Return the subset of the variables which are bound in all solutions.

Specified by:

getAlwaysBound in interface ISolutionSetStats

getNotAlwaysBound

public Set<IVariable<?>> getNotAlwaysBound()

Description copied from interface: ISolutionSetStats

Return the subset of the variables which are NOT bound in all solutions.

Specified by:

getNotAlwaysBound in interface ISolutionSetStats

getMaterialized

public Set<IVariable<?>> getMaterialized()

Description copied from interface: ISolutionSetStats

Return the subset of the variables which are materialized in all solutions in which they appear (the variables do not have to be bound in every solution, but if they are bound then their IVCache association is always set).

Specified by:

getMaterialized in interface ISolutionSetStats

getConstants

public Map<IVariable<?>,IConstant<?>> getConstants()

Description copied from interface: ISolutionSetStats

The set of variables which are effective constants (they are bound in every solution and always to the same value) together with their constant bindings.

Specified by:

getConstants in interface ISolutionSetStats

Returns:

The set of variables which are effective constants.