"""

 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)