saffron.rel
Interface Type

All Known Implementing Classes:

TypeFactoryImpl.TypeImpl

public interface Type

The type of a scalar expression or a row returned from a relational expression.

Since:

May 29, 2003

Version:

$Id: //open/saffron/src/main/saffron/rel/Type.java#1 $

Author:

jhyde

Method Summary

TypeFactory	getFactory()
Field	getField(String fieldName)
int	getFieldCount() Returns the number of columns.
int	getFieldOrdinal(String fieldName)
Field[]	getFields() Returns the columns.
Type[]	getJoinTypes() Returns the component types of a join type.
boolean	isJoin() Whether the type represents a cartesian product of regular types.
boolean	isProject()

Method Detail

getFieldCount

public int getFieldCount()

Returns the number of columns.

getFields

public Field[] getFields()

Returns the columns.

Post-condition:

return != null

getFieldOrdinal

public int getFieldOrdinal(String fieldName)

getField

public Field getField(String fieldName)

isJoin

public boolean isJoin()

Whether the type represents a cartesian product of regular types.

getJoinTypes

public Type[] getJoinTypes()

Returns the component types of a join type.

Pre-condition:

isJoin()

isProject

public boolean isProject()

getFactory

public TypeFactory getFactory()