public void defineOperation(Statement left, Statement right) {
if (left == null || left instanceof KeywordStatement) {
operation = new NegateOperation();
} else if (left.resultType().equals(INTEGER) && right.resultType().equals(INTEGER)) {
operation = SubtractIntegerOperation.INSTANCE;
} else if (NUMERIC.isComparableTo(left.resultType())) {
operation = SubtractDecimalOperation.INSTANCE;
} else if (left.resultType().equals(DATE) && right.resultType().equals(INTEGER)) {
operation = new SubtractDateOperation();
} else {
throw new LangException(LangError.E31, "Uso incorreto do operador -");
}
}
/*
* (non-Javadoc)
*
* @see
* br.gov.serpro.ctd.lang.keyword.KeywordStatement#link(br.gov.serpro.ctd
* .lang.Statement, br.gov.serpro.ctd.lang.Statement)
*/
@Override
public void link(Statement left, Statement right) {
if (operation instanceof NegateOperation) { // Negate
left = null;
if (right.resultType().equals(INTEGER)) {
operation = new IntegerNegateOperation();
}
}
super.link(left, right);
}