org.eigenbase.sql.type
Interface SqlOperandTypeChecker

All Known Subinterfaces:

SqlSingleOperandTypeChecker

All Known Implementing Classes:

AssignableOperandTypeChecker, ComparableOperandTypeChecker, CompositeOperandTypeChecker, FamilyOperandTypeChecker, LiteralOperandTypeChecker, MultisetOperandTypeChecker, SameOperandTypeChecker, SetopOperandTypeChecker

public interface SqlOperandTypeChecker

Strategy interface to check for allowed operand types of an operator call.

This interface is an example of the strategy pattern.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/type/SqlOperandTypeChecker.java#6 $

Author:

Wael Chatila

Method Summary

boolean	checkOperandTypes(SqlCallBinding callBinding, boolean throwOnFailure) Checks the types of all operands to an operator call.
String	getAllowedSignatures(SqlOperator op, String opName) Returns a string describing the allowed formal signatures of a call, e.g.
SqlOperandCountRange	getOperandCountRange()

Method Detail

checkOperandTypes

boolean checkOperandTypes(SqlCallBinding callBinding,
                          boolean throwOnFailure)

Checks the types of all operands to an operator call.

Parameters:

callBinding - description of the call to be checked

throwOnFailure - whether to throw an exception if check fails (otherwise returns false in that case)

Returns:

whether check succeeded

getOperandCountRange

SqlOperandCountRange getOperandCountRange()

Returns:

range of operand counts allowed in a call

getAllowedSignatures

String getAllowedSignatures(SqlOperator op,
                            String opName)

Returns a string describing the allowed formal signatures of a call, e.g. "SUBSTR(VARCHAR, INTEGER, INTEGER)".

Parameters:

op - the operator being checked

opName - name to use for the operator in case of aliasing

Returns:

generated string