Fennel: FixedWidthAccessor Class Reference (original) (raw)

FixedWidthAccessor accesses NOT NULL fixed width attributes. More...

#include <[AttributeAccessorImpl.h](AttributeAccessorImpl%5F8h-source.html)>

Inheritance diagram for FixedWidthAccessor:

Public Member Functions
void	unmarshalValue (TupleAccessor const &tupleAccessor, TupleDatum &value) const
	Unmarshals the attribute's value by setting up the data pointer, length, and null indicator; does not actually copy any data.
bool	unmarshalNullableValue (TupleAccessor const &tupleAccessor, TupleDatum &value) const
	Tests the null indicator for this attribute in the tuple's null bit array.
void	marshalValueData (PBuffer pDestData, TupleDatum const &value) const
	Marshals value data for the attribute.
Public Attributes
uint	iNullBit
	Index of this attribute's null indicator bit in the tuple's bit array, or MAXU for a NOT NULL attribute.
uint	iFixedOffset
	Byte offset of this attribute within a stored tuple image, or MAXU if the start is variable.
uint	iEndIndirectOffset
	Indirect offset of the end of this attribute within a stored tuple image, or MAXU if the end is fixed.
uint	iValueBit
	Index of this attribute's value in the tuple's bit array, or MAXU for a non-bit attribute.
TupleStorageByteLength	cbStorage
	Copied from TupleAttributeDescriptor.cbStorage.

Detailed Description

FixedWidthAccessor accesses NOT NULL fixed width attributes.

Definition at line 82 of file AttributeAccessorImpl.h.

Member Function Documentation

void FixedWidthAccessor::unmarshalValue	(	TupleAccessor const &	tupleAccessor,
TupleDatum &	value
)	const [inline, virtual]

bool AttributeAccessorImpl::unmarshalNullableValue	(	TupleAccessor const &	tupleAccessor,
TupleDatum &	value
)	const [inline, inherited]

Tests the null indicator for this attribute in the tuple's null bit array.

Parameters:

tupleAccessor	containing TupleAccessor set up with the current tuple image to be accessed
value	receives the null bit

Returns:

true if value is null; false otherwise

Definition at line 60 of file AttributeAccessorImpl.h.

References TupleAccessor::getBitFields(), and TupleDatum::pData.

00062 { 00063 if (tupleAccessor.getBitFields()[iNullBit]) { 00064 value.pData = NULL; 00065 return true; 00066 } else { 00067 return false; 00068 } 00069 }

void AttributeAccessorImpl::marshalValueData	(	PBuffer	pDestData,
TupleDatum const &	value
)	const [inline, virtual, inherited]

Member Data Documentation

The documentation for this class was generated from the following file:

/home/pub/open/dev/fennel/tuple/AttributeAccessorImpl.h

Generated on Mon Jun 22 04:00:32 2009 for Fennel by 1.5.1