org.projog.core.predicate.builtin.list

Class Length

java.lang.Object

org.projog.core.predicate.AbstractPredicateFactory

org.projog.core.predicate.builtin.list.Length

All Implemented Interfaces:

KnowledgeBaseConsumer, PredicateFactory

public final class Length
extends AbstractPredicateFactory

length(X,Y) - determines the length of a list.

The length(X,Y) goal succeeds if the number of elements in the list X matches the integer value Y.

Constructor Summary

Constructors

Constructor and Description
Length()

Method Summary

Modifier and Type	Method and Description
protected Predicate	getPredicate(Term list, Term expectedLength)

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

Constructor Detail

Length

public Length()

Method Detail

getPredicate

protected Predicate getPredicate(Term list,
                                 Term expectedLength)

Overrides:

getPredicate in class AbstractPredicateFactory