com.bigdata.relation.rule

Interface IStarJoin.IStarConstraint<E>

All Known Implementing Classes:

SPOStarJoin.SPOStarConstraint

Enclosing interface:

IStarJoin<E>

public static interface IStarJoin.IStarConstraint<E>

A star constraint specifies the shape of the star join. Star constraints will determine whether a particular element matches the constraint, and will create variable bindings for that elements.

Method Summary

Methods

Modifier and Type	Method and Description
IStarJoin.IStarConstraint<E>	asBound(IBindingSet bindingSet) Return an as-bound version of this star constraint.
void	bind(IBindingSet bs, E e) Adds variable bindings to the supplied binding set based on the as-bound values of the supplied element.
int	getNumVars() Return the number of variables used in this star constraint.
boolean	isMatch(E e) Return true if a particular element matches this star constraint.
boolean	isOptional() Return true if this star constraint is optional.

Method Detail

asBound

IStarJoin.IStarConstraint<E> asBound(IBindingSet bindingSet)

Return an as-bound version of this star constraint.

Parameters:

bindingSet - the binding set from which to pull variable bindings

Returns:

the as-bound version of this star constraint

getNumVars

int getNumVars()

Return the number of variables used in this star constraint.

Returns:

the number of variables

isMatch

boolean isMatch(E e)

Return true if a particular element matches this star constraint.

Parameters:

e - the element to test

Returns:

true if there is a match

bind

void bind(IBindingSet bs,
        E e)

Adds variable bindings to the supplied binding set based on the as-bound values of the supplied element.

Parameters:

bs - the binding set to modify

e - the element from which to pull variable bindings

isOptional

boolean isOptional()

Return true if this star constraint is optional.

Returns:

true if optional