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

All Methods Instance Methods Concrete Methods
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 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

- Field Detail
  - retractPredicateFactory
```
private Inspect retractPredicateFactory
```
- 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