author | Lennard de Rijk <ljvderijk@gmail.com> |
Mon, 25 May 2009 01:56:09 +0200 | |
changeset 2337 | c05443664e3b |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
323
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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1 |
""" |
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2 |
This module houses the error-checking routines used by the GDAL |
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3 |
ctypes prototypes. |
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4 |
""" |
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5 |
from ctypes import c_void_p, string_at |
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6 |
from django.contrib.gis.gdal.error import check_err, OGRException, SRSException |
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7 |
from django.contrib.gis.gdal.libgdal import lgdal |
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8 |
|
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9 |
# Helper routines for retrieving pointers and/or values from |
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10 |
# arguments passed in by reference. |
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11 |
def arg_byref(args, offset=-1): |
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12 |
"Returns the pointer argument's by-refernece value." |
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13 |
return args[offset]._obj.value |
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14 |
|
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15 |
def ptr_byref(args, offset=-1): |
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16 |
"Returns the pointer argument passed in by-reference." |
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17 |
return args[offset]._obj |
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18 |
|
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19 |
def check_bool(result, func, cargs): |
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20 |
"Returns the boolean evaluation of the value." |
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21 |
if bool(result): return True |
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22 |
else: return False |
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23 |
|
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24 |
### String checking Routines ### |
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25 |
def check_const_string(result, func, cargs, offset=None): |
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26 |
""" |
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27 |
Similar functionality to `check_string`, but does not free the pointer. |
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28 |
""" |
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29 |
if offset: |
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30 |
check_err(result) |
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31 |
ptr = ptr_byref(cargs, offset) |
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32 |
return ptr.value |
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33 |
else: |
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34 |
return result |
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35 |
|
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36 |
def check_string(result, func, cargs, offset=-1, str_result=False): |
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37 |
""" |
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38 |
Checks the string output returned from the given function, and frees |
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39 |
the string pointer allocated by OGR. The `str_result` keyword |
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40 |
may be used when the result is the string pointer, otherwise |
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41 |
the OGR error code is assumed. The `offset` keyword may be used |
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42 |
to extract the string pointer passed in by-reference at the given |
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43 |
slice offset in the function arguments. |
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44 |
""" |
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45 |
if str_result: |
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46 |
# For routines that return a string. |
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47 |
ptr = result |
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48 |
if not ptr: s = None |
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49 |
else: s = string_at(result) |
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50 |
else: |
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51 |
# Error-code return specified. |
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52 |
check_err(result) |
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53 |
ptr = ptr_byref(cargs, offset) |
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54 |
# Getting the string value |
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55 |
s = ptr.value |
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56 |
# Correctly freeing the allocated memory beind GDAL pointer |
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57 |
# w/the VSIFree routine. |
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58 |
if ptr: lgdal.VSIFree(ptr) |
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59 |
return s |
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60 |
|
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61 |
### DataSource, Layer error-checking ### |
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62 |
|
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63 |
### Envelope checking ### |
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64 |
def check_envelope(result, func, cargs, offset=-1): |
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65 |
"Checks a function that returns an OGR Envelope by reference." |
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66 |
env = ptr_byref(cargs, offset) |
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67 |
return env |
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68 |
|
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69 |
### Geometry error-checking routines ### |
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70 |
def check_geom(result, func, cargs): |
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71 |
"Checks a function that returns a geometry." |
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72 |
# OGR_G_Clone may return an integer, even though the |
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73 |
# restype is set to c_void_p |
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74 |
if isinstance(result, int): |
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75 |
result = c_void_p(result) |
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76 |
if not result: |
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77 |
raise OGRException('Invalid geometry pointer returned from "%s".' % func.__name__) |
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78 |
return result |
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79 |
|
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80 |
def check_geom_offset(result, func, cargs, offset=-1): |
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81 |
"Chcks the geometry at the given offset in the C parameter list." |
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82 |
check_err(result) |
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83 |
geom = ptr_byref(cargs, offset=offset) |
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84 |
return check_geom(geom, func, cargs) |
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85 |
|
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86 |
### Spatial Reference error-checking routines ### |
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87 |
def check_srs(result, func, cargs): |
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88 |
if isinstance(result, int): |
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89 |
result = c_void_p(result) |
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90 |
if not result: |
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91 |
raise SRSException('Invalid spatial reference pointer returned from "%s".' % func.__name__) |
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92 |
return result |
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93 |
|
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94 |
### Other error-checking routines ### |
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95 |
def check_arg_errcode(result, func, cargs): |
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96 |
""" |
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97 |
The error code is returned in the last argument, by reference. |
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98 |
Check its value with `check_err` before returning the result. |
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99 |
""" |
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100 |
check_err(arg_byref(cargs)) |
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101 |
return result |
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102 |
|
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103 |
def check_errcode(result, func, cargs): |
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104 |
""" |
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105 |
Check the error code returned (c_int). |
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106 |
""" |
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107 |
check_err(result) |
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108 |
return |
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109 |
|
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110 |
def check_pointer(result, func, cargs): |
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111 |
"Makes sure the result pointer is valid." |
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112 |
if bool(result): |
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113 |
return result |
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114 |
else: |
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115 |
raise OGRException('Invalid pointer returned from "%s"' % func.__name__) |
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116 |
|
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117 |
def check_str_arg(result, func, cargs): |
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118 |
""" |
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119 |
This is for the OSRGet[Angular|Linear]Units functions, which |
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120 |
require that the returned string pointer not be freed. This |
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parents:
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121 |
returns both the double and tring values. |
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parents:
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122 |
""" |
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123 |
dbl = result |
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124 |
ptr = cargs[-1]._obj |
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125 |
return dbl, ptr.value |