/*@ public normal_behavior
@ requires rng != null;
@ ensures (\forall JMLEqualsEqualsPair pair; ;
@ \result.theRelation.has(pair)
@ == rng.has(pair.value)
@ && elementImage(pair.key).has(pair.value)
@ );
@*/
public /*@ non_null @*/ JMLEqualsToEqualsRelation restrictRangeTo(
/*@ non_null @*/ JMLEqualsSet rng) {
JMLValueSet newImagePairSet = new JMLValueSet();
JMLEqualsSet newDom = new JMLEqualsSet();
int newSize = 0;
JMLEqualsToEqualsRelationImageEnumerator imagePairEnum = this.imagePairs();
JMLEqualsValuePair imagePair;
JMLEqualsSet img;
while (imagePairEnum.hasMoreElements()) {
imagePair = imagePairEnum.nextImagePair();
// @ assume imagePair.value != null;
// @ assume imagePair.value instanceof JMLEqualsSet;
img = ((JMLEqualsSet) imagePair.value).intersection(rng);
if (!img.isEmpty()) {
newImagePairSet = newImagePairSet.insert(new JMLEqualsValuePair(imagePair.key, img));
newDom = newDom.insert(imagePair.key);
newSize = newSize + img.int_size();
}
}
return new JMLEqualsToEqualsRelation(newImagePairSet, newDom, newSize);
} // @ nowarn Exception;
