1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
#from shapely import GEOSException
from libc.stdio cimport snprintf
from libc.stdlib cimport free, malloc
import warnings
from shapely import GEOSException
cdef void geos_message_handler(const char* message, void* userdata) noexcept:
snprintf(<char *>userdata, 1024, "%s", message)
cdef class get_geos_handle:
'''This class provides a context manager that wraps the GEOS context handle.
Example
-------
with get_geos_handle() as geos_handle:
SomeGEOSFunc(geos_handle, ...<other params>)
'''
cdef GEOSContextHandle_t __enter__(self):
self.handle = GEOS_init_r()
self.last_error = <char *> malloc((1025) * sizeof(char))
self.last_error[0] = 0
self.last_warning = <char *> malloc((1025) * sizeof(char))
self.last_warning[0] = 0
GEOSContext_setErrorMessageHandler_r(
self.handle, &geos_message_handler, self.last_error
)
GEOSContext_setNoticeMessageHandler_r(
self.handle, &geos_message_handler, self.last_warning
)
return self.handle
def __exit__(self, type, value, traceback):
try:
if self.last_error[0] != 0:
raise GEOSException(self.last_error)
if self.last_warning[0] != 0:
warnings.warn(self.last_warning)
finally:
GEOS_finish_r(self.handle)
free(self.last_error)
free(self.last_warning)
|
