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"""!
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@brief Pyclustering package that is used to exchange between python core and 'ccore'.
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@authors Andrei Novikov ([email protected])
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@date 2014-2017
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@copyright GNU Public License
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@cond GNU_PUBLIC_LICENSE
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PyClustering is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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PyClustering is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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@endcond
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"""
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from ctypes import *;
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class pyclustering_package(Structure):
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"""!
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@brief pyclustering_package description in memory.
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@details Represents following C++ structure:
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typedef struct pyclustering_package {
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std::size_t size;
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unsigned int type;
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void * data;
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}
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"""
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_fields_ = [ ("size", c_size_t),
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("type", c_uint),
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("data", POINTER(c_void_p)) ];
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class pyclustering_type_data:
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"""!
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@brief Contains constants that defines type of package.
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"""
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PYCLUSTERING_TYPE_INT = 0x00;
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PYCLUSTERING_TYPE_UNSIGNED_INT = 0x01;
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PYCLUSTERING_TYPE_FLOAT = 0x02;
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PYCLUSTERING_TYPE_DOUBLE = 0x03;
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PYCLUSTERING_TYPE_LONG = 0x04;
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PYCLUSTERING_TYPE_UNSIGNED_LONG = 0x05;
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PYCLUSTERING_TYPE_LIST = 0x06;
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PYCLUSTERING_TYPE_SIZE_T = 0x07;
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PYCLUSTERING_TYPE_UNDEFINED = 0x08;
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__CTYPE_PYCLUSTERING_MAP = {
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c_int : PYCLUSTERING_TYPE_INT,
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c_uint : PYCLUSTERING_TYPE_UNSIGNED_INT,
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c_float : PYCLUSTERING_TYPE_FLOAT,
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c_double : PYCLUSTERING_TYPE_DOUBLE,
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c_long : PYCLUSTERING_TYPE_LONG,
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c_ulong : PYCLUSTERING_TYPE_UNSIGNED_LONG,
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POINTER(pyclustering_package) : PYCLUSTERING_TYPE_LIST,
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c_size_t : PYCLUSTERING_TYPE_SIZE_T,
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None : PYCLUSTERING_TYPE_UNDEFINED
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}
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__PYCLUSTERING_CTYPE_MAP = {
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PYCLUSTERING_TYPE_INT : c_int,
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PYCLUSTERING_TYPE_UNSIGNED_INT : c_uint,
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PYCLUSTERING_TYPE_FLOAT : c_float,
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PYCLUSTERING_TYPE_DOUBLE : c_double,
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PYCLUSTERING_TYPE_LONG : c_long,
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PYCLUSTERING_TYPE_UNSIGNED_LONG : c_ulong,
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PYCLUSTERING_TYPE_LIST : POINTER(pyclustering_package),
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PYCLUSTERING_TYPE_SIZE_T : c_size_t,
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PYCLUSTERING_TYPE_UNDEFINED : None
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}
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@staticmethod
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def get_ctype(pyclustering_package_type):
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"""!
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@return (ctype) Return ctype that corresponds to pyclustering type data.
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"""
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return pyclustering_type_data.__PYCLUSTERING_CTYPE_MAP[pyclustering_package_type];
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@staticmethod
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def get_pyclustering_type(data_ctype):
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"""!
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@return (unit) Return pyclustering data type that corresponds to ctype.
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"""
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return pyclustering_type_data.__CTYPE_PYCLUSTERING_MAP[data_ctype];
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class package_builder:
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"""!
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@brief Package builder provides service to create 'pyclustering_package' from data that is stored in 'list' container.
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"""
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def __init__(self, dataset, c_data_type):
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"""!
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@brief Initialize package builder object by dataset.
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@param[in] dataset (list): Data that should be packed in 'pyclustering_package'.
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@param[in] c_data_type (ctype.type): If specified than specified data type is used for data storing in package.
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"""
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self.__dataset = dataset;
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self.__c_data_type = c_data_type;
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def create(self):
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"""!
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@brief Performs packing procedure of the data to the package.
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@return (pointer) ctype-pointer to pyclustering package.
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"""
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return self.__create_package(self.__dataset);
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def __is_container_type(self, value):
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if (isinstance(value, list) or isinstance(value, tuple)):
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return True;
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return False;
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def __get_type(self, pyclustering_data_type):
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if (self.__c_data_type is None):
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return pyclustering_data_type;
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return self.__c_data_type;
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def __create_package(self, dataset):
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dataset_package = pyclustering_package();
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dataset_package.size = len(dataset);
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if (len(dataset) == 0):
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dataset_package.type = pyclustering_type_data.PYCLUSTERING_TYPE_UNDEFINED;
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dataset_package.data = None;
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return pointer(dataset_package);
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c_data_type = self.__fill_type(dataset_package, dataset);
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self.__fill_data(dataset_package, c_data_type, dataset);
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return pointer(dataset_package);
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def __fill_dataset_type(self, dataset_package, dataset):
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if (self.__is_container_type(dataset[0])):
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dataset_package.type = pyclustering_type_data.PYCLUSTERING_TYPE_LIST;
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elif (isinstance(dataset[0], int)):
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dataset_package.type = pyclustering_type_data.PYCLUSTERING_TYPE_LONG;
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elif (isinstance(dataset[0], float)):
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dataset_package.type = pyclustering_type_data.PYCLUSTERING_TYPE_DOUBLE;
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else:
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raise NameError("Not supported type of pyclustering package.");
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return pyclustering_type_data.get_ctype(dataset_package.type);
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def __fill_specify_type(self, dataset_package):
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dataset_package.type = pyclustering_type_data.get_pyclustering_type(self.__c_data_type);
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return self.__c_data_type;
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def __fill_type(self, dataset_package, dataset):
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if (self.__is_container_type(dataset[0])):
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dataset_package.type = pyclustering_type_data.PYCLUSTERING_TYPE_LIST;
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return None;
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if (self.__c_data_type is None):
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return self.__fill_dataset_type(dataset_package, dataset);
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return self.__fill_specify_type(dataset_package);
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def __fill_data(self, dataset_package, c_data_type, dataset):
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if (dataset_package.type == pyclustering_type_data.PYCLUSTERING_TYPE_LIST):
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package_data = (POINTER(pyclustering_package) * len(dataset))();
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for index in range(len(dataset)):
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package_data[index] = self.__create_package(dataset[index]);
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dataset_package.data = cast(package_data, POINTER(c_void_p));
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else:
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array_object = (c_data_type * len(dataset))(*dataset);
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dataset_package.data = cast(array_object, POINTER(c_void_p));
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class package_extractor:
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"""!
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@brief Package extractor provides servies to unpack pyclustering package.
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"""
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def __init__(self, package_pointer):
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"""!
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@brief Initialize package extractor object by ctype-pointer to 'pyclustering_package'.
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@param[in] package_pointer (pointer): ctype-pointer to 'pyclustering_package' that should be used for unpacking.
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"""
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self.__package_pointer = package_pointer;
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def extract(self):
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"""!
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@brief Performs unpacking procedure of the pyclustering package to the data.
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@return (list) Extracted data from the pyclustering package.
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"""
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return self.__extract_data(self.__package_pointer);
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def __extract_data(self, ccore_package_pointer):
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if (ccore_package_pointer == 0):
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return [];
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pointer_package = cast(ccore_package_pointer, POINTER(pyclustering_package));
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return self.__unpack_pointer_data(pointer_package);
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def __unpack_data(self, pointer_package, pointer_data, type_package):
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result = [];
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for index in range(0, pointer_package[0].size):
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if (type_package == pyclustering_type_data.PYCLUSTERING_TYPE_LIST):
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pointer_package = cast(pointer_data[index], (POINTER(pyclustering_package)));
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result.append(self.__extract_data(pointer_package));
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else:
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result.append(pointer_data[index]);
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return result;
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def __unpack_pointer_data(self, pointer_package):
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type_package = pointer_package[0].type;
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if (pointer_package[0].size == 0):
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return [];
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pointer_data = cast(pointer_package[0].data, POINTER(pyclustering_type_data.get_ctype(type_package)));
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return self.__unpack_data(pointer_package, pointer_data, type_package);
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annoviko /
pyclustering
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