com.bigdata.rdf.spo

Class SPOStarJoin.SPOStarConstraint

java.lang.Object

com.bigdata.rdf.spo.SPOStarJoin.SPOStarConstraint

All Implemented Interfaces:

IStarJoin.IStarConstraint<ISPO>, Serializable

Enclosing class:

SPOStarJoin

public static class SPOStarJoin.SPOStarConstraint
extends Object
implements IStarJoin.IStarConstraint<ISPO>, Serializable

Implementation of a star constraint for SPOs. Constraint will specify a P and O (variable or constant) and whether the constraint is optional or non-optional.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected IVariableOrConstant<IV>	o Variable or constant O for the constraint.
protected boolean	optional Is the constraint optional or non-optional.
protected IVariableOrConstant<IV>	p Variable or constant P for the constraint.

Constructor Summary

Constructors

Constructor and Description
SPOStarJoin.SPOStarConstraint(IVariableOrConstant<IV> p, IVariableOrConstant<IV> o) Construct a non-optional SPO star constraint using the supplied P and O.
SPOStarJoin.SPOStarConstraint(IVariableOrConstant<IV> p, IVariableOrConstant<IV> o, boolean optional) Fully specified ctor.

Method Summary

Methods

Modifier and Type	Method and Description
IStarJoin.IStarConstraint<ISPO>	asBound(IBindingSet bindingSet) Return an as-bound version of this SPO star constraint for the supplied binding set.
void	bind(IBindingSet bs, ISPO spo) Use the supplied SPO to create variable bindings for supplied binding set.
int	getNumVars() Return the number of variables used in this star constraint.
boolean	isMatch(ISPO spo) Tests the P and O of the supplied SPO against the constraint.
boolean	isOptional() Return true if this star constraint is optional.
IVariableOrConstant<IV>	o()
IVariableOrConstant<IV>	p()
String	toString()
String	toString(IBindingSet bindingSet)

Methods inherited from class java.lang.Object

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

Field Detail

p

protected final IVariableOrConstant<IV> p

Variable or constant P for the constraint.

o

protected final IVariableOrConstant<IV> o

Variable or constant O for the constraint.

optional

protected final boolean optional

Is the constraint optional or non-optional.

Constructor Detail

SPOStarJoin.SPOStarConstraint

public SPOStarJoin.SPOStarConstraint(IVariableOrConstant<IV> p,
                             IVariableOrConstant<IV> o)

Construct a non-optional SPO star constraint using the supplied P and O.

Parameters:

p -

o -

SPOStarJoin.SPOStarConstraint

public SPOStarJoin.SPOStarConstraint(IVariableOrConstant<IV> p,
                             IVariableOrConstant<IV> o,
                             boolean optional)

Fully specified ctor.

Parameters:

p -

o -

optional -

Method Detail

p

public final IVariableOrConstant<IV> p()

o

public final IVariableOrConstant<IV> o()

isOptional

public final boolean isOptional()

Description copied from interface: IStarJoin.IStarConstraint

Return true if this star constraint is optional.

Specified by:

isOptional in interface IStarJoin.IStarConstraint<ISPO>

Returns:

true if optional

getNumVars

public final int getNumVars()

Description copied from interface: IStarJoin.IStarConstraint

Return the number of variables used in this star constraint.

Specified by:

getNumVars in interface IStarJoin.IStarConstraint<ISPO>

Returns:

the number of variables

isMatch

public final boolean isMatch(ISPO spo)

Tests the P and O of the supplied SPO against the constraint. Return true for a match.

Specified by:

isMatch in interface IStarJoin.IStarConstraint<ISPO>

Parameters:

spo - the element to test

Returns:

true if there is a match

bind

public final void bind(IBindingSet bs,
        ISPO spo)

Use the supplied SPO to create variable bindings for supplied binding set.

Specified by:

bind in interface IStarJoin.IStarConstraint<ISPO>

Parameters:

bs - the binding set to modify

spo - the element from which to pull variable bindings

asBound

public IStarJoin.IStarConstraint<ISPO> asBound(IBindingSet bindingSet)

Return an as-bound version of this SPO star constraint for the supplied binding set.

Specified by:

asBound in interface IStarJoin.IStarConstraint<ISPO>

Parameters:

bindingSet - the binding set from which to pull variable bindings

Returns:

the as-bound version of this star constraint

toString

public String toString()

Overrides:

toString in class Object

toString

public String toString(IBindingSet bindingSet)