FixedWidthNetworkAccessor16 Class Reference

FixedWidthNetworkAccessor16 accesses NOT NULL fixed width 16-bit attributes in network byte order. More...

#include <AttributeAccessorImpl.h>

Inheritance diagram for FixedWidthNetworkAccessor16:


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.
void	marshalValueData (PBuffer pDestData, TupleDatum const &value) const
	Marshals value data for the attribute.
bool	unmarshalNullableValue (TupleAccessor const &tupleAccessor, TupleDatum &value) const
	Tests the null indicator for this attribute in the tuple's null bit array.
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

FixedWidthNetworkAccessor16 accesses NOT NULL fixed width 16-bit attributes in network byte order.

Definition at line 97 of file AttributeAccessorImpl.h.

Member Function Documentation

void FixedWidthNetworkAccessor16::unmarshalValue	(	TupleAccessor const &	tupleAccessor,
		TupleDatum &	value
	)			const `[inline, virtual]`

Unmarshals the attribute's value by setting up the data pointer, length, and null indicator; does not actually copy any data.

Parameters:

	tupleAccessor	containing TupleAccessor set up with the current tuple image to be accessed
	value	receives the reference to the unmarshalled value

Reimplemented from FixedWidthAccessor.

Definition at line 101 of file AttributeAccessorImpl.h.

References TupleDatum::cbData, TupleDatum::data16, TupleDatum::pData, and FixedWidthAccessor::unmarshalValue().

00103     {
00104         assert(value.cbData == sizeof(uint16_t));
00105         FixedWidthAccessor::unmarshalValue(tupleAccessor,value);
00106         value.data16 = ntohs(*reinterpret_cast<uint16_t const *>(value.pData));
00107         value.pData = reinterpret_cast<PConstBuffer>(&(value.data16));
00108     }

void FixedWidthNetworkAccessor16::marshalValueData	(	PBuffer	pDestData,
		TupleDatum const &	value
	)			const `[inline, virtual]`

Marshals value data for the attribute.

Only deals with the data bytes, not length and null indicators.

Parameters:

	pDestData	the target address where the data should be marshalled
	value	the value to be marshalled

Reimplemented from AttributeAccessorImpl.

Definition at line 110 of file AttributeAccessorImpl.h.

References TupleDatum::cbData, and TupleDatum::pData.

00113     {
00114         assert(value.cbData == sizeof(uint16_t));
00115         *reinterpret_cast<uint16_t *>(pDestData) =
00116             htons(*reinterpret_cast<uint16_t const *>(value.pData));
00117     }

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     }