@Test
public void testNullFilter() throws Exception {
PropertyIsNull nullFilter = ff.isNull(ff.property("measurement/result"));
Filter unrolled = (Filter) nullFilter.accept(visitor, null);
assertTrue(unrolled instanceof PropertyIsNull);
assertNotSame(nullFilter, unrolled);
PropertyIsNull unmapped = (PropertyIsNull) unrolled;
Expression unmappedAtt = unmapped.getExpression();
assertTrue(unmappedAtt instanceof PropertyName);
assertEquals("results_value", ((PropertyName) unmappedAtt).getPropertyName());
}
public Object visit(PropertyIsNull filter, Object notUsed) {
if (original == null) original = filter;
if (!fcs.supports(PropertyIsNull.class)) {
postStack.push(filter);
return null;
}
int i = postStack.size();
((PropertyIsNull) filter).getExpression().accept(this, null);
if (i < postStack.size()) {
postStack.pop();
postStack.push(filter);
}
preStack.pop(); // null
preStack.push(filter);
return null;
}
