package org.yaac.server.egql.evaluator.function;
import java.math.BigDecimal;
import org.yaac.server.egql.evaluator.EvaluationResult;
import org.yaac.server.egql.exception.EGQLException;
import org.yaac.server.egql.processor.ProcessData.ProcessDataRecord;
import org.yaac.shared.ErrorCode;
/**
* @author Max Zhu (thebbsky@gmail.com)
*
*/
public class RoundFunction extends Function {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
public void validate() throws EGQLException {
FunctionUtil.ensureParamSize(ops, 2);
}
@Override
public EvaluationResult evaluate(ProcessDataRecord record) {
if (this.ops.isEmpty()) {
return new EvaluationResult(null).withWarning(ErrorCode.W114);
} else if (this.ops.size() == 2) {
EvaluationResult r = ops.get(0).evaluate(record);
EvaluationResult scale = ops.get(1).evaluate(record);
if (r.getPayload() instanceof Number && scale.getPayload() instanceof Number) {
BigDecimal bd = (BigDecimal) r.getPayload();
BigDecimal scaleBd = (BigDecimal) scale.getPayload();
return new EvaluationResult(
bd.setScale(scaleBd.intValue(), BigDecimal.ROUND_HALF_UP), r, scale);
} else {
return r.withWarning(ErrorCode.W113);
}
} else {
return ops.get(0).evaluate(record).withWarning(ErrorCode.W114);
}
}
}