public double calculatePostage() {
// create a visitor
PostageVisitor visitor = new PostageVisitor();
// iterate through all items
for (Visitable item : items) {
item.accept(visitor);
}
double postage = visitor.getTotalPostage();
return postage;
}
// Work around HAPI #224: TSComponentOne implementation of isEmpty is buggy
private static boolean isEmpty(Visitable v) throws HL7Exception {
if (v == null) return true;
if (v instanceof TSComponentOne) {
TSComponentOne tsc1 = (TSComponentOne) v;
return tsc1.getValue() == null || tsc1.getValue().isEmpty();
}
if (v instanceof Composite && v.getClass().getName().endsWith(".TS")) {
Composite ts = (Composite) v;
return isEmpty(ts.getComponent(0));
}
return v.isEmpty();
}
public Visitable visit(Visitable any) throws VisitFailure {
int childCount = any.getChildCount();
Visitable result = any;
int successCount = 0;
for (int i = 0; i < childCount; i++) {
try {
result = result.setChildAt(i, v.visit(any.getChildAt(i)));
successCount++;
} catch (VisitFailure f) {
}
}
if (successCount == 0) {
failure.setMessage(
"Some: None of the " + childCount + " arguments of " + any + " succeeded.");
throw failure;
}
return result;
}
@SuppressWarnings("rawtypes")
@Override
public void visit(Collection collection) {
Iterator iterator = collection.iterator();
while (iterator.hasNext()) {
Object o = iterator.next();
if (o instanceof Visitable) ((Visitable) o).accept(this);
else if (o instanceof Collection) visit((Collection) o);
}
}
public void visitVisitableCollection(VisitableCollection collection) {
for (Object o : collection.value) {
if (o instanceof Visitable) ((Visitable) o).accept(this);
}
}
public T defaultVisit(Visitable visitable) {
return visitable.visit(this);
}