1 """

     2  This module houses the OGR & SRS Exception objects, and the

     3  check_err() routine which checks the status code returned by

     4  OGR methods.

     5 """

     6 #### OGR & SRS Exceptions ####

     7 class GDALException(Exception): pass

     8 class OGRException(Exception): pass

     9 class SRSException(Exception): pass

    10 class OGRIndexError(OGRException, KeyError):

    11     """

    12     This exception is raised when an invalid index is encountered, and has

    13     the 'silent_variable_feature' attribute set to true.  This ensures that

    14     django's templates proceed to use the next lookup type gracefully when

    15     an Exception is raised.  Fixes ticket #4740.

    16     """

    17     silent_variable_failure = True

    18 

    19 #### OGR error checking codes and routine ####

    20 

    21 # OGR Error Codes

    22 OGRERR_DICT = { 1 : (OGRException, 'Not enough data.'),

    23                 2 : (OGRException, 'Not enough memory.'),

    24                 3 : (OGRException, 'Unsupported geometry type.'),

    25                 4 : (OGRException, 'Unsupported operation.'),

    26                 5 : (OGRException, 'Corrupt data.'),

    27                 6 : (OGRException, 'OGR failure.'),

    28                 7 : (SRSException, 'Unsupported SRS.'),

    29                 8 : (OGRException, 'Invalid handle.'),

    30                 }

    31 OGRERR_NONE = 0

    32 

    33 def check_err(code):

    34     "Checks the given OGRERR, and raises an exception where appropriate."

    35     

    36     if code == OGRERR_NONE:

    37         return

    38     elif code in OGRERR_DICT:

    39         e, msg = OGRERR_DICT[code]

    40         raise e, msg

    41     else:

    42         raise OGRException('Unknown error code: "%s"' % code)