// @ requires ipEnum != null;
// @ requires iEnum != null;
// @ requires (ipEnum.moreElements || iEnum.moreElements) ==> k != null;
protected JMLObjectToObjectRelationEnumerator(
JMLObjectToObjectRelationImageEnumerator ipEnum, JMLObjectSetEnumerator iEnum, Object k) {
// @ assume (ipEnum.moreElements || iEnum.moreElements) ==> k != null;
// @ set owner = null;
// @ set elementType = \type(JMLObjectObjectPair);
// @ set returnsNull = false;
imagePairEnum = (JMLObjectToObjectRelationImageEnumerator) ipEnum.clone();
imageEnum = (JMLObjectSetEnumerator) iEnum.clone();
key = k;
// @ assume moreElements ==> key != null;
}
/*@ normal_behavior
@ requires rel != null;
@ assignable uniteratedPairs;
@ assignable moreElements, elementType, returnsNull, owner;
@ ensures uniteratedPairs.equals(rel.theRelation);
@ ensures owner == null;
@*/
JMLObjectToObjectRelationEnumerator(
/*@ non_null @*/
JMLObjectToObjectRelation rel) {
// @ set owner = null;
// @ set elementType = \type(JMLObjectObjectPair);
// @ set returnsNull = false;
imagePairEnum = rel.imagePairs();
if (imagePairEnum.hasMoreElements()) {
JMLObjectValuePair p = imagePairEnum.nextImagePair();
key = p.key;
// @ assume key != null;
// @ assume p.value != null;
// @ assume p.value instanceof JMLObjectSet;
imageEnum = ((JMLObjectSet) p.value).elements();
// @ assume imageEnum.moreElements;
} else {
key = null;
imageEnum = (new JMLObjectSet()).elements();
// @ assume !imageEnum.moreElements;
}
}
/*@ also
@ public normal_behavior
@ requires !uniteratedPairs.isEmpty();
@ assignable uniteratedPairs;
@ ensures \old(uniteratedPairs).has((JMLType)\result)
@ && uniteratedPairs.
@ equals(\old(uniteratedPairs).remove((JMLType)\result));
@ also
@ public exceptional_behavior
@ requires uniteratedPairs.isEmpty();
@ assignable \nothing;
@ signals_only JMLNoSuchElementException;
@*/
public Object nextElement() throws JMLNoSuchElementException {
if (imageEnum.hasMoreElements()) {
Object v = imageEnum.nextElement();
// @ assume v != null && v instanceof Object;
return new JMLObjectObjectPair(key, (Object) v);
} else if (imagePairEnum.hasMoreElements()) {
Object p = imagePairEnum.nextElement();
// @ assume p != null && p instanceof JMLObjectValuePair;
JMLObjectValuePair imagePair = (JMLObjectValuePair) p;
key = imagePair.key;
// @ assume imagePair.value != null;
// @ assume imagePair.value instanceof JMLObjectSet;
imageEnum = ((JMLObjectSet) imagePair.value).elements();
// @ assume imageEnum.moreElements;
Object v = imageEnum.nextElement();
// @ assume v != null && v instanceof Object;
return new JMLObjectObjectPair(key, v);
} else {
throw new JMLNoSuchElementException();
}
}
/*@ also
@ public normal_behavior
@ assignable \nothing;
@ ensures \result == !uniteratedPairs.isEmpty();
@*/
public /*@ pure @*/ boolean hasMoreElements() {
return (imagePairEnum.hasMoreElements() || imageEnum.hasMoreElements());
}
