org.projog.core.predicate.builtin.list

Class Nth

java.lang.Object

org.projog.core.predicate.AbstractPredicateFactory

org.projog.core.predicate.builtin.list.Nth

All Implemented Interfaces:

KnowledgeBaseConsumer, PredicateFactory

public final class Nth
extends AbstractPredicateFactory

nth0(X,Y,Z) / nth1(X,Y,Z) - examines an element of a list.

Indexing starts at 0 when using nth0. Indexing starts at 1 when using nth1.

Method Summary

Modifier and Type	Method and Description
protected Predicate	getPredicate(Term index, Term list, Term element)
static Nth	nth0()
static Nth	nth1()

Methods inherited from class org.projog.core.predicate.AbstractPredicateFactory

getArithmeticOperators, getFileHandles, getKnowledgeBase, getOperands, getPredicate, getPredicate, getPredicate, getPredicate, getPredicate, getPredicates, getProjogListeners, getSpyPoints, getTermFormatter, init, isRetryable, setKnowledgeBase

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.projog.core.predicate.PredicateFactory

isAlwaysCutOnBacktrack

Method Detail

nth0

public static Nth nth0()

nth1

public static Nth nth1()

getPredicate

protected Predicate getPredicate(Term index,
                                 Term list,
                                 Term element)

Overrides:

getPredicate in class AbstractPredicateFactory