org.eigenbase.sql.type
Class SameOperandTypeChecker

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

All Implemented Interfaces:

SqlOperandTypeChecker

Direct Known Subclasses:

ComparableOperandTypeChecker

public class SameOperandTypeChecker
extends Object
implements SqlOperandTypeChecker

Parameter type-checking strategy where all operand types must be the same.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/type/SameOperandTypeChecker.java#13 $

Author:

Wael Chatila

Field Summary

protected int

nOperands

Constructor Summary

SameOperandTypeChecker(int nOperands)

Method Summary

boolean	checkOperandTypes(SqlCallBinding callBinding, boolean throwOnFailure) Checks the types of all operands to an operator call.
boolean	checkOperandTypes(SqlOperatorBinding operatorBinding) Similar functionality to checkOperandTypes(SqlCallBinding, boolean), but not part of the interface, and cannot throw an error.
private boolean	checkOperandTypesImpl(SqlOperatorBinding operatorBinding, boolean throwOnFailure, SqlCallBinding callBinding)
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

nOperands

protected final int nOperands

Constructor Detail

SameOperandTypeChecker

public SameOperandTypeChecker(int nOperands)

Method Detail

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

checkOperandTypesImpl

private boolean checkOperandTypesImpl(SqlOperatorBinding operatorBinding,
                                      boolean throwOnFailure,
                                      SqlCallBinding callBinding)

checkOperandTypes

public boolean checkOperandTypes(SqlOperatorBinding operatorBinding)

Similar functionality to checkOperandTypes(SqlCallBinding, boolean), but not part of the interface, and cannot throw an error.

getOperandCountRange

public SqlOperandCountRange getOperandCountRange()

Specified by:

getOperandCountRange in interface SqlOperandTypeChecker

Returns:

range of operand counts allowed in a call

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