KeySort

java.lang.Object
- org.projog.core.predicate.AbstractSingleResultPredicate
- - org.projog.core.predicate.builtin.list.KeySort

All Implemented Interfaces:

KnowledgeBaseConsumer, PredicateFactory
```
public final class KeySort
extends AbstractSingleResultPredicate
```
keysort(X,Y) - sorts a list of key/value pairs.
Sorts the list X, containing key/value pairs, and attempts to unify the result with Y. Key/value pairs are compound terms with a functor of - and two arguments. The first argument is the key and the second argument is the value. It is the key of the key/value pairs that is used to sort the elements contained in X. (Note: duplicates are not removed.)

Field Summary

Fields
Modifier and Type Field Description

private static java.util.Comparator<Term> KEY_VALUE_PAIR_COMPARATOR

Constructor Summary

Constructors
Constructor Description

KeySort()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`private boolean`	`assertKeyValuePairs(java.util.List<Term> elements)`
`protected boolean`	`evaluate(Term original, Term result)`

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

KEY_VALUE_PAIR_COMPARATOR

private static final java.util.Comparator<Term> KEY_VALUE_PAIR_COMPARATOR

Constructor Detail
- KeySort
```
public KeySort()
```

Method Detail

evaluate

protected boolean evaluate(Term original,
                           Term result)

Overrides:: evaluate in class AbstractSingleResultPredicate

assertKeyValuePairs

private boolean assertKeyValuePairs(java.util.List<Term> elements)