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.

Field Summary

Fields
Modifier and Type Field Description

private java.util.Map<PredicateKey,Numeric> flags

Constructor Summary

Constructors
Constructor Description

Flag()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected boolean`	`evaluate(Term key, Term oldValue, Term newValue)`
`private Numeric`	`getOrCreate(PredicateKey pk)`
`private void`	`put(PredicateKey pk, Term value)`

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

Field Detail

flags

private final java.util.Map<PredicateKey,Numeric> flags

Constructor Detail
- Flag
```
public Flag()
```

Method Detail

evaluate

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

Overrides:: evaluate in class AbstractSingleResultPredicate

getOrCreate

private Numeric getOrCreate(PredicateKey pk)

put

private void put(PredicateKey pk,
                 Term value)