IsEmptyOperator extends AbstractOperator implements RelationalOperator { @Override public TYPE getType() { return TYPE.IS_EMPTY; } IsEmptyOperator(); @Override String getName(); @Override Predicate toPredicate(String prop, String val); @Override TYPE getType();  }
@Test public void testGetType() { assertSame(Operator.TYPE.IS_EMPTY, new IsEmptyOperator().getType()); }