org.projog.core.predicate.builtin.list

Class KeySort

java.lang.Object

org.projog.core.predicate.AbstractSingleResultPredicate

org.projog.core.predicate.builtin.list.KeySort

All Implemented Interfaces:

KnowledgeBaseConsumer, PredicateFactory

public final class KeySort
extends AbstractSingleResultPredicate

keysort(X,Y) - sorts a list of key/value pairs.

Sorts the list X, containing key/value pairs, and attempts to unify the result with Y. Key/value pairs are compound terms with a functor of - and two arguments. The first argument is the key and the second argument is the value. It is the key of the key/value pairs that is used to sort the elements contained in X. (Note: duplicates are not removed.)

Constructor Summary

Constructors

Constructor and Description
KeySort()

Method Summary

Modifier and Type	Method and Description
protected boolean	evaluate(Term original, Term result)

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

evaluate, evaluate, evaluate, evaluate, evaluate, getArithmeticOperators, getFileHandles, getKnowledgeBase, getOperands, 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

KeySort

public KeySort()

Method Detail

evaluate

protected boolean evaluate(Term original,
                           Term result)

Overrides:

evaluate in class AbstractSingleResultPredicate