Fennel: FixedOffsetVarWidthAccessor< network > Class Template Reference (original) (raw)

FixedOffsetVarWidthAccessor accesses the first variable-width attribute if it is NOT NULL. More...

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

Inheritance diagram for FixedOffsetVarWidthAccessor< network >:

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

template

class FixedOffsetVarWidthAccessor< network >

FixedOffsetVarWidthAccessor accesses the first variable-width attribute if it is NOT NULL.

This attribute is special because the offset is fixed, but the width is not.

Definition at line 180 of file AttributeAccessorImpl.h.

Member Function Documentation

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