org.eigenbase.sql.type
Class ComparableOperandTypeChecker

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

All Implemented Interfaces:

SqlOperandTypeChecker

public class ComparableOperandTypeChecker
extends SameOperandTypeChecker

Type checking strategy which verifies that types have the required attributes to be used as arguments to comparison operators.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/type/ComparableOperandTypeChecker.java#8 $

Author:

John V. Sichi

Field Summary

private RelDataTypeComparability

requiredComparability

Fields inherited from class org.eigenbase.sql.type.SameOperandTypeChecker

nOperands

Constructor Summary

ComparableOperandTypeChecker(int nOperands, RelDataTypeComparability requiredComparability)

Method Summary

boolean	checkOperandTypes(SqlCallBinding callBinding, boolean throwOnFailure) Checks the types of all operands to an operator call.
boolean	checkOperandTypes(SqlOperatorBinding callBinding) Similar functionality to checkOperandTypes(SqlCallBinding, boolean), but not part of the interface, and cannot throw an error.
private boolean	checkType(SqlCallBinding callBinding, boolean throwOnFailure, RelDataType type)
String	getAllowedSignatures(SqlOperator op, String opName) Returns a string describing the allowed formal signatures of a call, e.g.

Methods inherited from class org.eigenbase.sql.type.SameOperandTypeChecker

getOperandCountRange

Methods inherited from class java.lang.Object

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

Field Detail

requiredComparability

private final RelDataTypeComparability requiredComparability

Constructor Detail

ComparableOperandTypeChecker

public ComparableOperandTypeChecker(int nOperands,
                                    RelDataTypeComparability requiredComparability)

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

Overrides:

checkOperandTypes in class SameOperandTypeChecker

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

checkType

private boolean checkType(SqlCallBinding callBinding,
                          boolean throwOnFailure,
                          RelDataType type)

checkOperandTypes

public boolean checkOperandTypes(SqlOperatorBinding callBinding)

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

Overrides:

checkOperandTypes in class SameOperandTypeChecker

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

Overrides:

getAllowedSignatures in class SameOperandTypeChecker

Parameters:

op - the operator being checked

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

Returns:

generated string