author | Lennard de Rijk <ljvderijk@gmail.com> |
Tue, 07 Apr 2009 22:20:23 +0000 | |
changeset 2125 | c24e8423cd1a |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
323
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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1 |
""" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
2 |
This module houses the ctypes initialization procedures, as well |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
3 |
as the notice and error handler function callbacks (get called |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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4 |
when an error occurs in GEOS). |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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5 |
|
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
6 |
This module also houses GEOS Pointer utilities, including |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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7 |
get_pointer_arr(), and GEOM_PTR. |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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8 |
""" |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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9 |
import atexit, os, re, sys |
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parents:
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10 |
from ctypes import c_char_p, Structure, CDLL, CFUNCTYPE, POINTER |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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11 |
from ctypes.util import find_library |
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Pawel Solyga <Pawel.Solyga@gmail.com>
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12 |
from django.contrib.gis.geos.error import GEOSException |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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13 |
|
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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14 |
# NumPy supported? |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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15 |
try: |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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16 |
from numpy import array, ndarray |
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17 |
HAS_NUMPY = True |
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Pawel Solyga <Pawel.Solyga@gmail.com>
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18 |
except ImportError: |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
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19 |
HAS_NUMPY = False |
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parents:
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20 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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21 |
# Custom library path set? |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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22 |
try: |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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23 |
from django.conf import settings |
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24 |
lib_path = settings.GEOS_LIBRARY_PATH |
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25 |
except (AttributeError, EnvironmentError, ImportError): |
ff1a9aa48cfd
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parents:
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26 |
lib_path = None |
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parents:
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27 |
|
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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28 |
# Setting the appropriate names for the GEOS-C library. |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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29 |
if lib_path: |
ff1a9aa48cfd
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parents:
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30 |
lib_names = None |
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31 |
elif os.name == 'nt': |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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32 |
# Windows NT libraries |
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parents:
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33 |
lib_names = ['libgeos_c-1'] |
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34 |
elif os.name == 'posix': |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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35 |
# *NIX libraries |
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parents:
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36 |
lib_names = ['geos_c'] |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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37 |
else: |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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38 |
raise ImportError('Unsupported OS "%s"' % os.name) |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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39 |
|
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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40 |
# Using the ctypes `find_library` utility to find the the path to the GEOS |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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41 |
# shared library. This is better than manually specifiying each library name |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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42 |
# and extension (e.g., libgeos_c.[so|so.1|dylib].). |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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43 |
if lib_names: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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44 |
for lib_name in lib_names: |
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parents:
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45 |
lib_path = find_library(lib_name) |
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parents:
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46 |
if not lib_path is None: break |
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parents:
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47 |
|
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parents:
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48 |
# No GEOS library could be found. |
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parents:
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49 |
if lib_path is None: |
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parents:
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50 |
raise ImportError('Could not find the GEOS library (tried "%s"). ' |
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51 |
'Try setting GEOS_LIBRARY_PATH in your settings.' % |
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parents:
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52 |
'", "'.join(lib_names)) |
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parents:
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53 |
|
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54 |
# Getting the GEOS C library. The C interface (CDLL) is used for |
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parents:
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55 |
# both *NIX and Windows. |
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parents:
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56 |
# See the GEOS C API source code for more details on the library function calls: |
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parents:
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57 |
# http://geos.refractions.net/ro/doxygen_docs/html/geos__c_8h-source.html |
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58 |
lgeos = CDLL(lib_path) |
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59 |
|
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parents:
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60 |
# The notice and error handler C function callback definitions. |
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61 |
# Supposed to mimic the GEOS message handler (C below): |
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parents:
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62 |
# "typedef void (*GEOSMessageHandler)(const char *fmt, ...);" |
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parents:
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63 |
NOTICEFUNC = CFUNCTYPE(None, c_char_p, c_char_p) |
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parents:
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64 |
def notice_h(fmt, lst, output_h=sys.stdout): |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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65 |
try: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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66 |
warn_msg = fmt % lst |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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67 |
except: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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68 |
warn_msg = fmt |
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parents:
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69 |
output_h.write('GEOS_NOTICE: %s\n' % warn_msg) |
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parents:
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70 |
notice_h = NOTICEFUNC(notice_h) |
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parents:
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71 |
|
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72 |
ERRORFUNC = CFUNCTYPE(None, c_char_p, c_char_p) |
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parents:
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73 |
def error_h(fmt, lst, output_h=sys.stderr): |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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74 |
try: |
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parents:
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75 |
err_msg = fmt % lst |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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76 |
except: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
77 |
err_msg = fmt |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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78 |
output_h.write('GEOS_ERROR: %s\n' % err_msg) |
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parents:
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79 |
error_h = ERRORFUNC(error_h) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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80 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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81 |
# The initGEOS routine should be called first, however, that routine takes |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
82 |
# the notice and error functions as parameters. Here is the C code that |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
83 |
# is wrapped: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
84 |
# "extern void GEOS_DLL initGEOS(GEOSMessageHandler notice_function, GEOSMessageHandler error_function);" |
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parents:
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|
85 |
lgeos.initGEOS(notice_h, error_h) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
86 |
|
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
87 |
#### GEOS Geometry C data structures, and utility functions. #### |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
88 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
89 |
# Opaque GEOS geometry structures, used for GEOM_PTR and CS_PTR |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
90 |
class GEOSGeom_t(Structure): pass |
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parents:
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|
91 |
class GEOSCoordSeq_t(Structure): pass |
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parents:
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92 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
93 |
# Pointers to opaque GEOS geometry structures. |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
94 |
GEOM_PTR = POINTER(GEOSGeom_t) |
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parents:
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|
95 |
CS_PTR = POINTER(GEOSCoordSeq_t) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
96 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
97 |
# Used specifically by the GEOSGeom_createPolygon and GEOSGeom_createCollection |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
98 |
# GEOS routines |
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parents:
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|
99 |
def get_pointer_arr(n): |
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parents:
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100 |
"Gets a ctypes pointer array (of length `n`) for GEOSGeom_t opaque pointer." |
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parents:
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101 |
GeomArr = GEOM_PTR * n |
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parents:
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102 |
return GeomArr() |
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parents:
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103 |
|
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parents:
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104 |
# Returns the string version of the GEOS library. Have to set the restype |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
105 |
# explicitly to c_char_p to ensure compatibility accross 32 and 64-bit platforms. |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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106 |
geos_version = lgeos.GEOSversion |
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parents:
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107 |
geos_version.argtypes = None |
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geos_version.restype = c_char_p |
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109 |
|
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110 |
# Regular expression should be able to parse version strings such as |
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# '3.0.0rc4-CAPI-1.3.3', or '3.0.0-CAPI-1.4.1' |
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112 |
version_regex = re.compile(r'^(?P<version>\d+\.\d+\.\d+)(rc(?P<release_candidate>\d+))?-CAPI-(?P<capi_version>\d+\.\d+\.\d+)$') |
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113 |
def geos_version_info(): |
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114 |
""" |
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115 |
Returns a dictionary containing the various version metadata parsed from |
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116 |
the GEOS version string, including the version number, whether the version |
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117 |
is a release candidate (and what number release candidate), and the C API |
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118 |
version. |
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119 |
""" |
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120 |
ver = geos_version() |
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121 |
m = version_regex.match(ver) |
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122 |
if not m: raise GEOSException('Could not parse version info string "%s"' % ver) |
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123 |
return dict((key, m.group(key)) for key in ('version', 'release_candidate', 'capi_version')) |
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124 |
|
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125 |
# Calling the finishGEOS() upon exit of the interpreter. |
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126 |
atexit.register(lgeos.finishGEOS) |