com.hp.hpl.jena.graph.query
Interface Predicate

All Known Implementing Classes:

PredicateBase, Relation

public interface Predicate

Author:

kers
A query Predicate is something that can evaluate to a boolean in the context of a Domain (which supplies values for variables).

Field Summary

static Predicate

TRUE The predicate TRUE, which always evaluates to _true_, and optimises itself away when it makes an _and_.

Method Summary

Predicate	and(Predicate other) return the AND-composition of this predicate and the other one
boolean	evaluateBool(Domain d) true iff the predicate is true given the values [for variables] in _d_

Field Detail

TRUE

public static final Predicate TRUE

The predicate TRUE, which always evaluates to _true_, and optimises itself away when it makes an _and_.

Method Detail

evaluateBool

public boolean evaluateBool(Domain d)

true iff the predicate is true given the values [for variables] in _d_

and

public Predicate and(Predicate other)

return the AND-composition of this predicate and the other one