Merged the gis branch into trunk.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@8219 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/gis/gdal/error.py

@@ -0,0 +1,41 @@
+"""
+ This module houses the OGR & SRS Exception objects, and the
+ check_err() routine which checks the status code returned by
+ OGR methods.
+"""
+#### OGR & SRS Exceptions ####
+class OGRException(Exception): pass
+class SRSException(Exception): pass
+class OGRIndexError(OGRException, KeyError):
+    """
+    This exception is raised when an invalid index is encountered, and has
+    the 'silent_variable_feature' attribute set to true.  This ensures that
+    django's templates proceed to use the next lookup type gracefully when
+    an Exception is raised.  Fixes ticket #4740.
+    """
+    silent_variable_failure = True
+
+#### OGR error checking codes and routine ####
+
+# OGR Error Codes
+OGRERR_DICT = { 1 : (OGRException, 'Not enough data.'),
+                2 : (OGRException, 'Not enough memory.'),
+                3 : (OGRException, 'Unsupported geometry type.'),
+                4 : (OGRException, 'Unsupported operation.'),
+                5 : (OGRException, 'Corrupt data.'),
+                6 : (OGRException, 'OGR failure.'),
+                7 : (SRSException, 'Unsupported SRS.'),
+                8 : (OGRException, 'Invalid handle.'),
+                }
+OGRERR_NONE = 0
+
+def check_err(code):
+    "Checks the given OGRERR, and raises an exception where appropriate."
+    
+    if code == OGRERR_NONE:
+        return
+    elif code in OGRERR_DICT:
+        e, msg = OGRERR_DICT[code]
+        raise e, msg
+    else:
+        raise OGRException('Unknown error code: "%s"' % code)