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.

Field Summary

Fields

Modifier and Type	Field	Description
private Inspect	retractPredicateFactory

Constructor Summary

Constructors

Constructor	Description
RetractAll()

Method Summary

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

Methods inherited from class AbstractSingleResultPredicate

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

retractPredicateFactory

private Inspect retractPredicateFactory

Constructor Details

RetractAll

public RetractAll()

Method Details

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