org.eigenbase.reltype
Interface RelDataTypePrecedenceList

All Known Implementing Classes:

SqlTypeExplicitPrecedenceList

public interface RelDataTypePrecedenceList

RelDataTypePrecedenceList defines a type precedence list for a particular type.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/reltype/RelDataTypePrecedenceList.java#9 $

Author:

John V. Sichi

Reference to SQL:1999 standard:

Part 2 Section 9.5

Method Summary

int	compareTypePrecedence(RelDataType type1, RelDataType type2) Compares the precedence of two types.
boolean	containsType(RelDataType type) Determines whether a type appears in this precedence list.

Method Detail

containsType

boolean containsType(RelDataType type)

Determines whether a type appears in this precedence list.

Parameters:

type - type to check

Returns:

true iff this list contains type

compareTypePrecedence

int compareTypePrecedence(RelDataType type1,
                          RelDataType type2)

Compares the precedence of two types.

Parameters:

type1 - first type to compare

type2 - second type to compare

Returns:

positive if type1 has higher precedence; negative if type2 has higher precedence; 0 if types have equal precedence

"Precondition:"

containsType(type1) && containsType(type2)