// The access to the elementsRef field should be synchronized
private synchronized VBox<FunctionalSet<E2>> getElementsBox() {
VBox<FunctionalSet<E2>> box = elementsRef.get();
if (box == null) {
box = SoftReferencedVBox.makeNew(this.listHolder, this.attributeName, true);
this.elementsRef = new SoftReference<VBox<FunctionalSet<E2>>>(box);
}
return box;
}
public RelationList(
E1 listHolder, Relation<E1, E2> relation, String attributeName, boolean allocateOnly) {
this.listHolder = listHolder;
this.relation = relation;
this.attributeName = attributeName;
VBox elementsBox = null;
if (allocateOnly) {
elementsBox = SoftReferencedVBox.makeNew(listHolder, attributeName, allocateOnly);
} else {
elementsBox =
new SoftReferencedVBox<FunctionalSet<E2>>(
listHolder, attributeName, DOFunctionalSet.EMPTY);
}
this.elementsRef = new SoftReference<VBox<FunctionalSet<E2>>>(elementsBox);
}
