Preprocessor that decompresses compressed strings.
Each string in CStringFeatures might be stored compressed in memory. This preprocessor decompresses these strings on the fly. This may be especially usefull for long strings and when datasets become too large to fit in memoryin uncompressed form but still when they are compressed.
Then avoiding expensive disk i/o strings are on-the-fly decompressed.
Definition at line 36 of file DecompressString.h.
Public Member Functions | |
CDecompressString (void) | |
CDecompressString (E_COMPRESSION_TYPE ct) | |
virtual | ~CDecompressString () |
virtual bool | init (CFeatures *f) |
initialize preprocessor from features | |
virtual void | cleanup () |
cleanup | |
bool | load (FILE *f) |
initialize preprocessor from file | |
bool | save (FILE *f) |
save preprocessor init-data to file | |
virtual bool | apply_to_string_features (CFeatures *f) |
virtual ST * | apply_to_string (ST *f, int32_t &len) |
apply preproc on single feature vector | |
virtual const char * | get_name () const |
virtual EPreprocessorType | get_type () const |
return a type of preprocessor TODO: template specification of get_type | |
Protected Attributes | |
CCompressor * | compressor |
CDecompressString | ( | void | ) |
default constructor
Definition at line 40 of file DecompressString.h.
constructor
Definition at line 48 of file DecompressString.h.
virtual ~CDecompressString | ( | ) | [virtual] |
destructor
Definition at line 55 of file DecompressString.h.
virtual ST* apply_to_string | ( | ST * | f, | |
int32_t & | len | |||
) | [virtual] |
apply preproc on single feature vector
Implements CStringPreprocessor< ST >.
Definition at line 115 of file DecompressString.h.
virtual bool apply_to_string_features | ( | CFeatures * | f | ) | [virtual] |
apply preproc on feature matrix result in feature matrix return pointer to feature_matrix, i.e. f->get_feature_matrix();
Implements CStringPreprocessor< ST >.
Definition at line 91 of file DecompressString.h.
virtual void cleanup | ( | ) | [virtual] |
virtual const char* get_name | ( | void | ) | const [virtual] |
Reimplemented from CStringPreprocessor< ST >.
Definition at line 134 of file DecompressString.h.
virtual EPreprocessorType get_type | ( | ) | const [virtual] |
return a type of preprocessor TODO: template specification of get_type
Reimplemented from CStringPreprocessor< ST >.
Definition at line 137 of file DecompressString.h.
virtual bool init | ( | CFeatures * | f | ) | [virtual] |
initialize preprocessor from features
Implements CPreprocessor.
Definition at line 61 of file DecompressString.h.
bool load | ( | FILE * | f | ) |
initialize preprocessor from file
Definition at line 73 of file DecompressString.h.
bool save | ( | FILE * | f | ) |
save preprocessor init-data to file
Definition at line 81 of file DecompressString.h.
CCompressor* compressor [protected] |
compressor used to decompress strings
Definition at line 141 of file DecompressString.h.