Fennel: VarCharType Class Reference (original) (raw)
Inheritance diagram for VarCharType:
| Public Types | |
|---|---|
| typedef uint | Ordinal |
| Each type must have a unique positive integer ordinal associated with it. | |
| Private Member Functions | |
| virtual Ordinal | getOrdinal () const |
| **Returns:**the ordinal representing this type. | |
| virtual uint | getBitCount () const |
| **Returns:**number of bits in marshalled representation, or 0 for a non-bit type; currently only 0 or 1 is supported | |
| virtual uint | getFixedByteCount () const |
| **Returns:**the width in bytes for a fixed-width non-bit type which admits no per-attribute precision, or 0 for types with per-attribute precision; for bit types, this yields the size of the unmarshalled representation | |
| virtual uint | getMinByteCount (uint cbMaxWidth) const |
| Gets the number of bytes required to store the narrowest value with this type, given a particular max byte count. | |
| virtual uint | getAlignmentByteCount (uint cbWidth) const |
| Gets the alignment size in bytes required for values of this type, given a particular max byte count. | |
| virtual void | visitValue (DataVisitor &dataVisitor, void const *pData, TupleStorageByteLength cbData) const |
| Visits a value of this type. | |
| virtual int | compareValues (void const *pData1, TupleStorageByteLength cbData1, void const *pData2, TupleStorageByteLength cbData2) const |
| Compares two values of this type. |
Detailed Description
Definition at line 250 of file StandardTypeDescriptor.cpp.
Member Typedef Documentation
Each type must have a unique positive integer ordinal associated with it.
This is used to reconstruct a StoredTypeDescriptor object from a stored attribute definition.
Definition at line 44 of file StoredTypeDescriptor.h.
Member Function Documentation
| virtual Ordinal VarCharType::getOrdinal | ( | | ) | const [inline, private, virtual] | | ---------------------------------------------------------------------------------------------------------- | - | | - | ---------------------------------- |
| virtual uint VarCharType::getBitCount | ( | | ) | const [inline, private, virtual] | | -------------------------------------------------------------------------------------------------- | - | | - | ---------------------------------- |
| virtual uint VarCharType::getFixedByteCount | ( | | ) | const [inline, private, virtual] | | -------------------------------------------------------------------------------------------------------- | - | | - | ---------------------------------- |
Returns:
the width in bytes for a fixed-width non-bit type which admits no per-attribute precision, or 0 for types with per-attribute precision; for bit types, this yields the size of the unmarshalled representation
Implements StoredTypeDescriptor.
Definition at line 262 of file StandardTypeDescriptor.cpp.
00263 { 00264 return 0; 00265 }
| virtual uint VarCharType::getMinByteCount | ( | uint | cbMaxWidth | ) | const [inline, private, virtual] |
|---|
Gets the number of bytes required to store the narrowest value with this type, given a particular max byte count.
For a fixed-width type, the return value is the same as the input.
Parameters:
| cbMaxWidth | maximum width for which to compute the minimum |
|---|
Returns:
number of bytes
Implements StoredTypeDescriptor.
Definition at line 267 of file StandardTypeDescriptor.cpp.
00268 { 00269 return 0; 00270 }
| virtual uint VarCharType::getAlignmentByteCount | ( | uint | cbWidth | ) | const [inline, private, virtual] |
|---|
Gets the alignment size in bytes required for values of this type, given a particular max byte count.
This must be 1, 2, 4, or 8, and may not be greater than 2 for variable-width datatypes. For fixed-width datatypes, the width must be a multiple of the alignment size.
Parameters:
| cbWidth | width for which to compute the alignment |
|---|
Returns:
number of bytes
Implements StoredTypeDescriptor.
Definition at line 272 of file StandardTypeDescriptor.cpp.
00273 { 00274 return 1; 00275 }
Compares two values of this type.
Parameters:
| pData1 | the address of the first data value |
|---|---|
| cbData1 | the width of the first data value in bytes |
| pData2 | the address of the second data value |
| cbData2 | the width of the second data value in bytes |
Returns:
negative if the first data value is less than the second; positive if greater; zero if equal
Implements StoredTypeDescriptor.
Definition at line 286 of file StandardTypeDescriptor.cpp.
References min().
00291 { 00292 TupleStorageByteLength cbMin = std::min(cbData1,cbData2); 00293 int rc = memcmp(pData1, pData2, cbMin); 00294 if (rc) { 00295 return rc; 00296 } 00297 if (cbData1 == cbData2) { 00298 return 0; 00299 } 00300 PConstBuffer pBuf1 = static_cast(pData1); 00301 PConstBuffer pBuf2 = static_cast(pData2); 00302 PConstBuffer trailStart,trailEnd; 00303 if (cbData1 > cbData2) { 00304 trailStart = pBuf1 + cbMin; 00305 trailEnd = pBuf1 + cbData1; 00306 rc = 1; 00307 } else { 00308 trailStart = pBuf2 + cbMin; 00309 trailEnd = pBuf2 + cbData2; 00310 rc = -1; 00311 } 00312 for (; trailStart < trailEnd; trailStart++) { 00313 if (*trailStart != ' ') { 00314 return rc; 00315 } 00316 } 00317 return 0; 00318 }
The documentation for this class was generated from the following file:
- /home/pub/open/dev/fennel/tuple/StandardTypeDescriptor.cpp
Generated on Mon Jun 22 04:00:49 2009 for Fennel by 
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