gis: gdal: Fixed memory leak introduced in the refactor caused by unnecessary cloning of SpatialReference objects from Features; fixed windows-compatibility issues (no error code returned by some destruction routines by windows libraries); OFTDate/Time fields return None if invalid date is encountered (thanks tlp).

git-svn-id: http://code.djangoproject.com/svn/django/branches/gis@6707 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/gis/gdal/feature.py

@@ -33,7 +33,12 @@ class Feature(object):
         if self._ptr: destroy_feature(self._ptr)
 
     def __getitem__(self, index):
-        "Gets the Field at the specified index."
+        """
+        Gets the Field object at the specified index, which may be either
+        an integer or the Field's string label.  Note that the Field object
+        is not the field's _value_ -- use the `get` method instead to 
+        retrieve the value (e.g. an integer) instead of a Field instance.
+        """
         if isinstance(index, basestring):
             i = self.index(index)
         else:
@@ -86,16 +91,8 @@ class Feature(object):
         "Returns the OGR Geometry for this Feature."
         # Retrieving the geometry pointer for the feature.
         geom_ptr = get_feat_geom_ref(self._ptr)
+        return OGRGeometry(clone_geom(geom_ptr))
 
-        # Attempting to retrieve the Spatial Reference for the geometry.
-        try:
-            srs_ptr = get_geom_srs(geom_ptr)
-            srs = SpatialReference(clone_srs(srs_ptr)) 
-        except OGRException:
-            srs = None
-        # Geometry is cloned so the feature isn't invalidated. 
-        return OGRGeometry(clone_geom(geom_ptr), srs)
-    
     @property
     def geom_type(self):
         "Returns the OGR Geometry Type for this Feture."
@@ -105,8 +102,8 @@ class Feature(object):
     def get(self, field):
         """
         Returns the value of the field, instead of an instance of the Field
-         object.  May take a string of the field name or a Field object as
-         parameters.
+        object.  May take a string of the field name or a Field object as
+        parameters.
         """
         field_name = getattr(field, 'name', field)
         return self[field_name].value

django/contrib/gis/gdal/field.py

@@ -128,7 +128,10 @@ class OFTDate(Field):
     def value(self):
         "Returns a Python `date` object for the OFTDate field."
         yy, mm, dd, hh, mn, ss, tz = self.as_datetime()
-        return date(yy.value, mm.value, dd.value)
+        try:
+            return date(yy.value, mm.value, dd.value)
+        except ValueError:
+            return None
 
 class OFTDateTime(Field):
     @property
@@ -139,14 +142,20 @@ class OFTDateTime(Field):
         #  See http://lists.maptools.org/pipermail/gdal-dev/2006-February/007990.html
         #  The `tz` variable has values of: 0=unknown, 1=localtime (ambiguous), 
         #  100=GMT, 104=GMT+1, 80=GMT-5, etc.
-        return datetime(yy.value, mm.value, dd.value, hh.value, mn.value, ss.value)
+        try:
+            return datetime(yy.value, mm.value, dd.value, hh.value, mn.value, ss.value)
+        except ValueError:
+            return None
 
 class OFTTime(Field):
     @property
     def value(self):
         "Returns a Python `time` object for this OFTTime field."
         yy, mm, dd, hh, mn, ss, tz = self.as_datetime()
-        return time(hh.value, mn.value, ss.value)
+        try:
+            return time(hh.value, mn.value, ss.value)
+        except ValueError:
+            return None
 
 # List fields are also just subclasses
 class OFTIntegerList(Field): pass

django/contrib/gis/gdal/libgdal.py

@@ -6,6 +6,7 @@ from django.contrib.gis.gdal.error import OGRException
 if os.name == 'nt':
     # Windows NT shared library
     lib_name = 'libgdal-1.dll'
+    errcheck_flag = False
 elif os.name == 'posix':
     platform = os.uname()[0]
     if platform == 'Darwin':
@@ -14,6 +15,7 @@ elif os.name == 'posix':
     else: 
         # Attempting to use .so extension for all other platforms.
         lib_name = 'libgdal.so'
+    errcheck_flag = True
 else:
     raise OGRException('Unsupported OS "%s"' % os.name)
 

django/contrib/gis/gdal/prototypes/ds.py

@@ -5,7 +5,7 @@
 """
 from ctypes import c_char_p, c_int, c_long, c_void_p, POINTER
 from django.contrib.gis.gdal.envelope import OGREnvelope
-from django.contrib.gis.gdal.libgdal import lgdal
+from django.contrib.gis.gdal.libgdal import lgdal, errcheck_flag
 from django.contrib.gis.gdal.prototypes.generation import \
     const_string_output, double_output, geom_output, int_output, \
     srs_output, void_output, voidptr_output
@@ -47,7 +47,7 @@ get_field_defn = voidptr_output(lgdal.OGR_FD_GetFieldDefn, [c_void_p, c_int])
 
 ### Feature Routines ###
 clone_feature = voidptr_output(lgdal.OGR_F_Clone, [c_void_p])
-destroy_feature = void_output(lgdal.OGR_F_Destroy, [c_void_p])
+destroy_feature = void_output(lgdal.OGR_F_Destroy, [c_void_p], errcheck=errcheck_flag)
 feature_equal = int_output(lgdal.OGR_F_Equal, [c_void_p, c_void_p])
 get_feat_geom_ref = geom_output(lgdal.OGR_F_GetGeometryRef, [c_void_p])
 get_feat_field_count = int_output(lgdal.OGR_F_GetFieldCount, [c_void_p])

django/contrib/gis/gdal/prototypes/geom.py

@@ -1,6 +1,6 @@
 from ctypes import c_char, c_char_p, c_double, c_int, c_ubyte, c_void_p, POINTER
 from django.contrib.gis.gdal.envelope import OGREnvelope
-from django.contrib.gis.gdal.libgdal import lgdal
+from django.contrib.gis.gdal.libgdal import lgdal, errcheck_flag
 from django.contrib.gis.gdal.prototypes.errcheck import check_bool, check_envelope
 from django.contrib.gis.gdal.prototypes.generation import \
     const_string_output, double_output, geom_output, int_output, \
@@ -72,7 +72,7 @@ get_geom_name = const_string_output(lgdal.OGR_G_GetGeometryName, [c_void_p])
 get_geom_type = int_output(lgdal.OGR_G_GetGeometryType, [c_void_p])
 get_point_count = int_output(lgdal.OGR_G_GetPointCount, [c_void_p])
 get_point = void_output(lgdal.OGR_G_GetPoint, [c_void_p, c_int, POINTER(c_double), POINTER(c_double), POINTER(c_double)], errcheck=False)
-geom_close_rings = void_output(lgdal.OGR_G_CloseRings, [c_void_p])
+geom_close_rings = void_output(lgdal.OGR_G_CloseRings, [c_void_p], errcheck=errcheck_flag)
 
 # Topology routines.
 ogr_contains = topology_func(lgdal.OGR_G_Contains)

django/contrib/gis/gdal/prototypes/srs.py

@@ -1,5 +1,5 @@
 from ctypes import c_char_p, c_int, c_void_p, POINTER
-from django.contrib.gis.gdal.libgdal import lgdal
+from django.contrib.gis.gdal.libgdal import lgdal, errcheck_flag
 from django.contrib.gis.gdal.prototypes.generation import \
     const_string_output, double_output, int_output, \
     srs_output, string_output, void_output
@@ -22,8 +22,9 @@ def units_func(f):
 # Creation & destruction.
 clone_srs = srs_output(lgdal.OSRClone, [c_void_p])
 new_srs = srs_output(lgdal.OSRNewSpatialReference, [c_char_p])
-release_srs = void_output(lgdal.OSRRelease, [c_void_p])
-srs_validate = void_output(lgdal.OSRValidate, [c_void_p], errcheck=True)
+release_srs = void_output(lgdal.OSRRelease, [c_void_p], errcheck=errcheck_flag)
+destroy_srs = void_output(lgdal.OSRDestroySpatialReference, [c_void_p], errcheck=errcheck_flag)
+srs_validate = void_output(lgdal.OSRValidate, [c_void_p])
 
 # Getting the semi_major, semi_minor, and flattening functions.
 semi_major = srs_double(lgdal.OSRGetSemiMajor)
@@ -67,4 +68,4 @@ isprojected = int_output(lgdal.OSRIsProjected, [c_void_p])
 
 # Coordinate transformation
 new_ct= srs_output(lgdal.OCTNewCoordinateTransformation, [c_void_p, c_void_p])
-destroy_ct = void_output(lgdal.OCTDestroyCoordinateTransformation, [c_void_p])
+destroy_ct = void_output(lgdal.OCTDestroyCoordinateTransformation, [c_void_p], errcheck=errcheck_flag)