Fennel: UnicodeVarCharType Class Reference (original) (raw)
Inheritance diagram for UnicodeVarCharType:
| 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 321 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 UnicodeVarCharType::getOrdinal | ( | | ) | const [inline, private, virtual] | | ----------------------------------------------------------------------------------------------------------------- | - | | - | ---------------------------------- |
| virtual uint UnicodeVarCharType::getBitCount | ( | | ) | const [inline, private, virtual] | | --------------------------------------------------------------------------------------------------------- | - | | - | ---------------------------------- |
| virtual uint UnicodeVarCharType::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 333 of file StandardTypeDescriptor.cpp.
00334 { 00335 return 0; 00336 }
| virtual uint UnicodeVarCharType::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 338 of file StandardTypeDescriptor.cpp.
00339 { 00340 return 0; 00341 }
| virtual uint UnicodeVarCharType::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 343 of file StandardTypeDescriptor.cpp.
00344 { 00345 return 2; 00346 }
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 358 of file StandardTypeDescriptor.cpp.
References UnicodeCharType::compareStrings(), and min().
00363 { 00364 assert((cbData1 & 1) == 0); 00365 assert((cbData2 & 1) == 0); 00366 Ucs2ConstBuffer pStr1 = static_cast(pData1); 00367 Ucs2ConstBuffer pStr2 = static_cast(pData2); 00368 TupleStorageByteLength cbMin = std::min(cbData1,cbData2); 00369 uint nCharsMin = (cbMin >> 1); 00370 int rc = UnicodeCharType::compareStrings(pStr1, pStr2, nCharsMin); 00371 if (rc) { 00372 return rc; 00373 } 00374 if (cbData1 == cbData2) { 00375 return 0; 00376 } 00377 Ucs2ConstBuffer trailStart,trailEnd; 00378 if (cbData1 > cbData2) { 00379 trailStart = pStr1 + nCharsMin; 00380 trailEnd = pStr1 + (cbData1 >> 1); 00381 rc = 1; 00382 } else { 00383 trailStart = pStr2 + nCharsMin; 00384 trailEnd = pStr2 + (cbData2 >> 1); 00385 rc = -1; 00386 } 00387 for (; trailStart < trailEnd; trailStart++) { 00388 if (*trailStart != ' ') { 00389 return rc; 00390 } 00391 } 00392 return 0; 00393 }
The documentation for this class was generated from the following file:
- /home/pub/open/dev/fennel/tuple/StandardTypeDescriptor.cpp
Generated on Mon Jun 22 04:00:48 2009 for Fennel by 
1.5.1