org.eigenbase.sql.type
Class AssignableOperandTypeChecker

java.lang.Object
  org.eigenbase.sql.type.AssignableOperandTypeChecker

All Implemented Interfaces:

SqlOperandTypeChecker

public class AssignableOperandTypeChecker
extends Object
implements SqlOperandTypeChecker

AssignableOperandTypeChecker implements SqlOperandTypeChecker by verifying that the type of each argument is assignable to a predefined set of parameter types (under the SQL definition of "assignable").

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/type/AssignableOperandTypeChecker.java#7 $

Author:

John V. Sichi

Field Summary

private RelDataType[]

paramTypes

Constructor Summary

AssignableOperandTypeChecker(RelDataType[] paramTypes)
Instantiates this strategy with a specific set of parameter types.

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()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

paramTypes

private final RelDataType[] paramTypes

Constructor Detail

AssignableOperandTypeChecker

public AssignableOperandTypeChecker(RelDataType[] paramTypes)

Instantiates this strategy with a specific set of parameter types.

Parameters:

paramTypes - parameter types for operands; index in this array corresponds to operand number

Method Detail

getOperandCountRange

public SqlOperandCountRange getOperandCountRange()

Specified by:

getOperandCountRange in interface SqlOperandTypeChecker

Returns:

range of operand counts allowed in a call

checkOperandTypes

public boolean checkOperandTypes(SqlCallBinding callBinding,
                                 boolean throwOnFailure)

Description copied from interface: SqlOperandTypeChecker

Checks the types of all operands to an operator call.

Specified by:

checkOperandTypes in interface SqlOperandTypeChecker

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

getAllowedSignatures

public String getAllowedSignatures(SqlOperator op,
                                   String opName)

Description copied from interface: SqlOperandTypeChecker

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

Specified by:

getAllowedSignatures in interface SqlOperandTypeChecker

Parameters:

op - the operator being checked

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

Returns:

generated string