Length

java.lang.Object
- org.projog.core.predicate.AbstractPredicateFactory
- - org.projog.core.predicate.builtin.list.Length

All Implemented Interfaces:

KnowledgeBaseConsumer, PredicateFactory
```
public final class Length
extends AbstractPredicateFactory
```
length(X,Y) - determines the length of a list.
The length(X,Y) goal succeeds if the number of elements in the list X matches the integer value Y.

- Nested Class Summary
  
  Nested Classes
  Modifier and Type Class Description
  
  private static class Length.Retryable
- Constructor Summary
  
  Constructors
  Constructor Description
  
  Length()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  protected Predicate getPredicate(Term list, Term expectedLength)
  - Methods inherited from class org.projog.core.predicate.AbstractPredicateFactory
    getArithmeticOperators, getFileHandles, getKnowledgeBase, getOperands, getPredicate, getPredicate, getPredicate, getPredicate, 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
- Length
```
public Length()
```

Method Detail

getPredicate

protected Predicate getPredicate(Term list,
                                 Term expectedLength)

Overrides:: getPredicate in class AbstractPredicateFactory