org.eigenbase.sql.fun
Class SqlThrowOperator

java.lang.Object
  org.eigenbase.sql.SqlOperator
      org.eigenbase.sql.SqlSpecialOperator
          org.eigenbase.sql.SqlInternalOperator
              org.eigenbase.sql.fun.SqlThrowOperator

public class SqlThrowOperator
extends SqlInternalOperator

An internal operator that throws an exception.
The exception is thrown with a (localized) error message which is the only input paramter to the operator.
The return type is defined as a BOOLEAN to facilitate the use of it in constructs like the following:

CASE
WHEN <conditionn> THEN true
ELSE throw("what's wrong with you man?")
END

Since:

Mar 29, 2005

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/fun/SqlThrowOperator.java#10 $

Author:

Wael Chatila

Field Summary

Fields inherited from class org.eigenbase.sql.SqlOperator

MaxPrec, NL

Constructor Summary

SqlThrowOperator()

Method Summary

void	unparse(SqlWriter writer, SqlNode[] operands, int leftPrec, int rightPrec) Writes a SQL representation of a call to this operator to a writer, including parentheses if the operators on either side are of greater precedence.

Methods inherited from class org.eigenbase.sql.SqlInternalOperator

getSyntax

Methods inherited from class org.eigenbase.sql.SqlSpecialOperator

reduceExpr

Methods inherited from class org.eigenbase.sql.SqlOperator

acceptCall, acceptCall, adjustType, argumentMustBeScalar, checkOperandCount, checkOperandTypes, createCall, createCall, createCall, createCall, deriveType, equals, getAllowedSignatures, getAllowedSignatures, getKind, getLeftPrec, getMonotonicity, getName, getOperandCountRange, getOperandTypeChecker, getOperandTypeInference, getReturnTypeInference, getRightPrec, getSignatureTemplate, hashCode, inferReturnType, inferReturnType, isAggregator, isDeterministic, isDynamicFunction, isName, leftPrec, preValidateCall, requiresDecimalExpansion, rewriteCall, rightPrec, toString, unparseListClause, unparseListClause, validateCall, validateOperands

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

SqlThrowOperator

public SqlThrowOperator()

Method Detail

unparse

public void unparse(SqlWriter writer,
                    SqlNode[] operands,
                    int leftPrec,
                    int rightPrec)

Description copied from class: SqlOperator

Writes a SQL representation of a call to this operator to a writer, including parentheses if the operators on either side are of greater precedence.

The default implementation of this method delegates to SqlSyntax.unparse(org.eigenbase.sql.SqlWriter, org.eigenbase.sql.SqlOperator, org.eigenbase.sql.SqlNode[], int, int).

Overrides:

unparse in class SqlInternalOperator