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.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private class	Nth.Retryable

Field Summary

Fields

Modifier and Type	Field	Description
private final int	startingIdx

Constructor Summary

Constructors

Modifier	Constructor	Description
private	Nth(int startingIdx)

Method Summary

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

Methods inherited from class AbstractPredicateFactory

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

Methods inherited from class Object

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

Methods inherited from interface PredicateFactory

isAlwaysCutOnBacktrack

Field Details

startingIdx

private final int startingIdx

Constructor Details

Nth

private Nth(int startingIdx)

Method Details

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

evaluate

private boolean evaluate(int index,
 Term list,
 Term element)