org.projog.core.predicate.builtin.kb

Class Flag

java.lang.Object

org.projog.core.predicate.AbstractSingleResultPredicate

org.projog.core.predicate.builtin.kb.Flag

All Implemented Interfaces:

KnowledgeBaseConsumer, PredicateFactory

public final class Flag
extends AbstractSingleResultPredicate

flag(X,Y,Z) - associates a key with a value.

The first argument must be an atom or structure. The name and arity of the first argument is used to construct the key. The second argument is the value currently associated with the key. If there is not currently a value associated with the key then it will default to 0. The third argument is the new value to associate with the key. The third argument must be a numeric value.

Constructor Summary

Constructors

Constructor and Description
Flag()

Method Summary

Modifier and Type	Method and Description
protected boolean	evaluate(Term key, Term oldValue, Term newValue)

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

Flag

public Flag()

Method Detail

evaluate

protected boolean evaluate(Term key,
                           Term oldValue,
                           Term newValue)

Overrides:

evaluate in class AbstractSingleResultPredicate