author | Pawel Solyga <Pawel.Solyga@gmail.com> |
Wed, 15 Apr 2009 15:56:17 +0000 | |
changeset 2185 | 09ca8e661728 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
323
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Load ../vendor/django into trunk/app/django.
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parents:
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1 |
from ctypes import byref, c_int |
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from datetime import date, datetime, time |
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from django.contrib.gis.gdal.error import OGRException |
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from django.contrib.gis.gdal.prototypes.ds import \ |
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get_feat_field_defn, get_field_as_datetime, get_field_as_double, \ |
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get_field_as_integer, get_field_as_string, get_field_name, get_field_precision, \ |
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7 |
get_field_type, get_field_type_name, get_field_width |
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|
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9 |
# For more information, see the OGR C API source code: |
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# http://www.gdal.org/ogr/ogr__api_8h.html |
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# |
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12 |
# The OGR_Fld_* routines are relevant here. |
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class Field(object): |
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14 |
"A class that wraps an OGR Field, needs to be instantiated from a Feature object." |
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|
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16 |
#### Python 'magic' routines #### |
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def __init__(self, feat, index): |
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18 |
""" |
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19 |
Initializes on the feature pointer and the integer index of |
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the field within the feature. |
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""" |
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# Setting the feature pointer and index. |
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self._feat = feat |
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self._index = index |
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|
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# Getting the pointer for this field. |
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fld = get_feat_field_defn(feat, index) |
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if not fld: |
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raise OGRException('Cannot create OGR Field, invalid pointer given.') |
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self._ptr = fld |
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|
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# Setting the class depending upon the OGR Field Type (OFT) |
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self.__class__ = FIELD_CLASSES[self.type] |
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|
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# OFTReal with no precision should be an OFTInteger. |
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if isinstance(self, OFTReal) and self.precision == 0: |
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self.__class__ = OFTInteger |
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|
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def __str__(self): |
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"Returns the string representation of the Field." |
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return str(self.value).strip() |
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|
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#### Field Methods #### |
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def as_double(self): |
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"Retrieves the Field's value as a double (float)." |
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return get_field_as_double(self._feat, self._index) |
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|
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def as_int(self): |
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"Retrieves the Field's value as an integer." |
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return get_field_as_integer(self._feat, self._index) |
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def as_string(self): |
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"Retrieves the Field's value as a string." |
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return get_field_as_string(self._feat, self._index) |
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|
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def as_datetime(self): |
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"Retrieves the Field's value as a tuple of date & time components." |
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yy, mm, dd, hh, mn, ss, tz = [c_int() for i in range(7)] |
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status = get_field_as_datetime(self._feat, self._index, byref(yy), byref(mm), byref(dd), |
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byref(hh), byref(mn), byref(ss), byref(tz)) |
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if status: |
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return (yy, mm, dd, hh, mn, ss, tz) |
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else: |
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raise OGRException('Unable to retrieve date & time information from the field.') |
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#### Field Properties #### |
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67 |
@property |
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def name(self): |
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"Returns the name of this Field." |
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return get_field_name(self._ptr) |
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@property |
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def precision(self): |
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"Returns the precision of this Field." |
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return get_field_precision(self._ptr) |
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@property |
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def type(self): |
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"Returns the OGR type of this Field." |
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return get_field_type(self._ptr) |
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@property |
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def type_name(self): |
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"Return the OGR field type name for this Field." |
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return get_field_type_name(self.type) |
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86 |
|
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87 |
@property |
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def value(self): |
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"Returns the value of this Field." |
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# Default is to get the field as a string. |
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return self.as_string() |
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92 |
|
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93 |
@property |
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94 |
def width(self): |
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95 |
"Returns the width of this Field." |
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96 |
return get_field_width(self._ptr) |
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97 |
|
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98 |
### The Field sub-classes for each OGR Field type. ### |
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99 |
class OFTInteger(Field): |
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100 |
@property |
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101 |
def value(self): |
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102 |
"Returns an integer contained in this field." |
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103 |
return self.as_int() |
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104 |
|
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105 |
@property |
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106 |
def type(self): |
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107 |
""" |
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108 |
GDAL uses OFTReals to represent OFTIntegers in created |
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109 |
shapefiles -- forcing the type here since the underlying field |
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110 |
type may actually be OFTReal. |
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111 |
""" |
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112 |
return 0 |
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|
113 |
|
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114 |
class OFTReal(Field): |
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115 |
@property |
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116 |
def value(self): |
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117 |
"Returns a float contained in this field." |
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118 |
return self.as_double() |
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119 |
|
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120 |
# String & Binary fields, just subclasses |
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121 |
class OFTString(Field): pass |
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122 |
class OFTWideString(Field): pass |
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123 |
class OFTBinary(Field): pass |
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124 |
|
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125 |
# OFTDate, OFTTime, OFTDateTime fields. |
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126 |
class OFTDate(Field): |
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127 |
@property |
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128 |
def value(self): |
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129 |
"Returns a Python `date` object for the OFTDate field." |
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130 |
yy, mm, dd, hh, mn, ss, tz = self.as_datetime() |
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131 |
try: |
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132 |
return date(yy.value, mm.value, dd.value) |
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|
133 |
except ValueError: |
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134 |
return None |
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|
135 |
|
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|
136 |
class OFTDateTime(Field): |
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137 |
@property |
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|
138 |
def value(self): |
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|
139 |
"Returns a Python `datetime` object for this OFTDateTime field." |
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parents:
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|
140 |
yy, mm, dd, hh, mn, ss, tz = self.as_datetime() |
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parents:
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|
141 |
# TODO: Adapt timezone information. |
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|
142 |
# See http://lists.maptools.org/pipermail/gdal-dev/2006-February/007990.html |
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parents:
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|
143 |
# The `tz` variable has values of: 0=unknown, 1=localtime (ambiguous), |
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Load ../vendor/django into trunk/app/django.
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parents:
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|
144 |
# 100=GMT, 104=GMT+1, 80=GMT-5, etc. |
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parents:
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|
145 |
try: |
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Load ../vendor/django into trunk/app/django.
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parents:
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|
146 |
return datetime(yy.value, mm.value, dd.value, hh.value, mn.value, ss.value) |
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parents:
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|
147 |
except ValueError: |
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Load ../vendor/django into trunk/app/django.
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parents:
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|
148 |
return None |
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Load ../vendor/django into trunk/app/django.
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parents:
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|
149 |
|
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parents:
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|
150 |
class OFTTime(Field): |
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parents:
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|
151 |
@property |
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parents:
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|
152 |
def value(self): |
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parents:
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|
153 |
"Returns a Python `time` object for this OFTTime field." |
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parents:
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|
154 |
yy, mm, dd, hh, mn, ss, tz = self.as_datetime() |
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parents:
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changeset
|
155 |
try: |
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parents:
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|
156 |
return time(hh.value, mn.value, ss.value) |
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parents:
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|
157 |
except ValueError: |
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parents:
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|
158 |
return None |
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Load ../vendor/django into trunk/app/django.
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parents:
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changeset
|
159 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
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|
160 |
# List fields are also just subclasses |
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parents:
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|
161 |
class OFTIntegerList(Field): pass |
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parents:
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|
162 |
class OFTRealList(Field): pass |
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parents:
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|
163 |
class OFTStringList(Field): pass |
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Load ../vendor/django into trunk/app/django.
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parents:
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|
164 |
class OFTWideStringList(Field): pass |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
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|
165 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
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|
166 |
# Class mapping dictionary for OFT Types |
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Load ../vendor/django into trunk/app/django.
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parents:
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|
167 |
FIELD_CLASSES = { 0 : OFTInteger, |
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parents:
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|
168 |
1 : OFTIntegerList, |
ff1a9aa48cfd
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parents:
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|
169 |
2 : OFTReal, |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
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|
170 |
3 : OFTRealList, |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
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|
171 |
4 : OFTString, |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
diff
changeset
|
172 |
5 : OFTStringList, |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
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changeset
|
173 |
6 : OFTWideString, |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
diff
changeset
|
174 |
7 : OFTWideStringList, |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
diff
changeset
|
175 |
8 : OFTBinary, |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
176 |
9 : OFTDate, |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
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changeset
|
177 |
10 : OFTTime, |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
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|
178 |
11 : OFTDateTime, |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
179 |
} |