com.hp.hpl.jena.graph.query
Class PredicateBase

java.lang.Object
  com.hp.hpl.jena.graph.query.PredicateBase

All Implemented Interfaces:

Predicate

Direct Known Subclasses:

Relation

public abstract class PredicateBase

extends java.lang.Object

implements Predicate

Author:

kers
PredicateBase provides a base class for implementations of Predicate. _evaluateBool_ is left abstract - who knows what the core meaning of a predicate is - but a default implementation of _and_ is supplied which does the "obvious thing": it's _evaluateBool_ is the && of the two component Predicate's _evaluateBool_s.

Field Summary

Fields inherited from interface com.hp.hpl.jena.graph.query.Predicate

TRUE

Constructor Summary

PredicateBase()

Method Summary

Predicate	and(Predicate other) L.and(R).evaluateBool(D) = L.evaluateBool(D) && R.evaluateBool(D)
abstract boolean	evaluateBool(Domain d) evaluate truth value in this domain: deferred to subclasses

Methods inherited from class java.lang.Object

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

Constructor Detail

PredicateBase

public PredicateBase()

Method Detail

evaluateBool

public abstract boolean evaluateBool(Domain d)

evaluate truth value in this domain: deferred to subclasses

Specified by:

evaluateBool in interface Predicate

and

public Predicate and(Predicate other)

L.and(R).evaluateBool(D) = L.evaluateBool(D) && R.evaluateBool(D)

Specified by:

and in interface Predicate