org.projog.core.predicate.builtin.kb

Class RetractAll

java.lang.Object

org.projog.core.predicate.AbstractSingleResultPredicate

org.projog.core.predicate.builtin.kb.RetractAll

All Implemented Interfaces:

KnowledgeBaseConsumer, PredicateFactory

public final class RetractAll
extends AbstractSingleResultPredicate

retractall(X) - remove clauses from the knowledge base.

All clauses that X matches are removed from the knowledge base. X must be suitably instantiated that the predicate of the clause can be determined.

Constructor Summary

Constructors

Constructor and Description
RetractAll()

Method Summary

Modifier and Type	Method and Description
protected boolean	evaluate(Term t)
protected void	init() This method is called by AbstractSingleResultPredicate.setKnowledgeBase(KnowledgeBase).

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

evaluate, evaluate, evaluate, evaluate, evaluate, getArithmeticOperators, getFileHandles, getKnowledgeBase, getOperands, getPredicate, getPredicates, getProjogListeners, getSpyPoints, getTermFormatter, 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

RetractAll

public RetractAll()

Method Detail

init

protected void init()

Description copied from class: AbstractSingleResultPredicate

This method is called by AbstractSingleResultPredicate.setKnowledgeBase(KnowledgeBase).

Can be overridden by subclasses to perform initialisation before any calls to AbstractSingleResultPredicate.evaluate(Term...) are made. As AbstractSingleResultPredicate.setKnowledgeBase(KnowledgeBase) will have already been called before this method is invoked, overridden versions will be able to access the KnowledgeBase using AbstractSingleResultPredicate.getKnowledgeBase().

Overrides:

init in class AbstractSingleResultPredicate

evaluate

protected boolean evaluate(Term t)

Overrides:

evaluate in class AbstractSingleResultPredicate