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/* Copyright (C) 2003 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifndef ATTRIBUTE_HEADER
#define ATTRIBUTE_HEADER
/**
* @class AttributeHeader
* @brief Header passed in front of every attribute value in AttrInfo signal
*/
class AttributeHeader {
friend class Dbtup;
friend class Backup;
friend class NdbOperation;
friend class DbUtil;
friend class Suma;
public:
/**
* Psuedo columns
*/
STATIC_CONST( PSUEDO = 0x8000 );
STATIC_CONST( FRAGMENT = 0xFFFE ); // Read fragment no
STATIC_CONST( ROW_COUNT = 0xFFFD ); // Read row count (committed)
STATIC_CONST( COMMIT_COUNT = 0xFFFC ); // Read commit count
STATIC_CONST( RANGE_NO = 0xFFFB ); // Read range no (when batched ranges)
STATIC_CONST( ROW_SIZE = 0xFFFA );
STATIC_CONST( FRAGMENT_MEMORY= 0xFFF9 );
/** Initialize AttributeHeader at location aHeaderPtr */
static AttributeHeader& init(void* aHeaderPtr, Uint32 anAttributeId,
Uint32 aDataSize);
/** Returns size of AttributeHeader (usually one or two words) */
Uint32 getHeaderSize() const; // In 32-bit words
/** Store AttributeHeader in location given as argument */
void insertHeader(Uint32*);
/** Get next attribute header (if there is one) */
AttributeHeader* getNext() const;
/** Get location of attribute value */
Uint32* getDataPtr() const;
/** Getters and Setters */
Uint32 getAttributeId() const;
void setAttributeId(Uint32);
Uint32 getDataSize() const; // In 32-bit words
void setDataSize(Uint32);
bool isNULL() const;
void setNULL();
/** Print **/
//void print(NdbOut&);
void print(FILE*);
static Uint32 getDataSize(Uint32);
public:
AttributeHeader(Uint32 = 0);
AttributeHeader(Uint32 anAttributeId, Uint32 aDataSize);
~AttributeHeader();
Uint32 m_value;
};
/**
* 1111111111222222222233
* 01234567890123456789012345678901
* ssssssssssssss eiiiiiiiiiiiiiiii
*
* i = Attribute Id
* s = Size of current "chunk" - 14 Bits -> 16384 (words) = 65k
* Including optional extra word(s).
* e - Element data/Blob, read element of array
* If == 0 next data word contains attribute value.
* If == 1 next data word contains:
* For Array of Fixed size Elements
* Start Index (16 bit), Stop Index(16 bit)
* For Blob
* Start offset (32 bit) (length is defined in previous word)
*
* An attribute value equal to "null" is represented by setting s == 0.
*
* Bit 14 is not yet used.
*/
inline
AttributeHeader& AttributeHeader::init(void* aHeaderPtr, Uint32 anAttributeId,
Uint32 aDataSize)
{
return * new (aHeaderPtr) AttributeHeader(anAttributeId, aDataSize);
}
inline
AttributeHeader::AttributeHeader(Uint32 aHeader)
{
m_value = aHeader;
}
inline
AttributeHeader::AttributeHeader(Uint32 anAttributeId, Uint32 aDataSize)
{
m_value = 0;
this->setAttributeId(anAttributeId);
this->setDataSize(aDataSize);
}
inline
AttributeHeader::~AttributeHeader()
{}
inline
Uint32 AttributeHeader::getHeaderSize() const
{
// Should check 'e' bit here
return 1;
}
inline
Uint32 AttributeHeader::getAttributeId() const
{
return (m_value & 0xFFFF0000) >> 16;
}
inline
void AttributeHeader::setAttributeId(Uint32 anAttributeId)
{
m_value &= 0x0000FFFF; // Clear attribute id
m_value |= (anAttributeId << 16);
}
inline
Uint32 AttributeHeader::getDataSize() const
{
return (m_value & 0x3FFF);
}
inline
void AttributeHeader::setDataSize(Uint32 aDataSize)
{
m_value &= (~0x3FFF);
m_value |= aDataSize;
}
inline
bool AttributeHeader::isNULL() const
{
return (getDataSize() == 0);
}
inline
void AttributeHeader::setNULL()
{
setDataSize(0);
}
inline
Uint32* AttributeHeader::getDataPtr() const
{
return (Uint32*)&m_value + getHeaderSize();
}
inline
void AttributeHeader::insertHeader(Uint32* target)
{
*target = m_value;
}
inline
AttributeHeader*
AttributeHeader::getNext() const {
return (AttributeHeader*)(getDataPtr() + getDataSize());
}
inline
void
//AttributeHeader::print(NdbOut& output) {
AttributeHeader::print(FILE* output) {
fprintf(output, "AttributeId: H\'%.8x (D\'%d), DataSize: H\'%.8x (D\'%d), "
"isNULL: %d\n",
getAttributeId(), getAttributeId(),
getDataSize(), getDataSize(),
isNULL());
}
inline
Uint32
AttributeHeader::getDataSize(Uint32 m_value){
return (m_value & 0x3FFF);
}
#endif
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