@Override
public Object visit(PropertyIsNull filter, Object extraData) {
checkExpressionIsProperty(filter.getExpression());
StringWriter output = asStringWriter(extraData);
ExpressionToSolr visitor = new ExpressionToSolr();
PropertyName propertyName = (PropertyName) filter.getExpression();
output.append("-");
propertyName.accept(visitor, output);
output.append(":[* TO *]");
return output;
}
@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) {
return visitNullNil(filter, filter.getExpression());
}
