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'''BoboPOS-defined exceptions

$Id: POSException.py,v 1.5.100.1 2001/02/09 01:54:16 chrism Exp $'''
__version__='$Revision: 1.5.100.1 $'[11:-2]


class POSError(Exception):
    """Persistent object system error
    """

class TransactionError(POSError):
    """An error occured due to normal transaction processing
    """

class ConflictError(TransactionError):
    """Two transactions tried to modify the same object at once

    This transaction should be resubmitted.
    """

class VersionError(POSError):
    """An error in handling versions occurred
    """

class VersionCommitError(VersionError):
    """An invalid combination of versions was used in a version commit
    """

class VersionLockError(VersionError, TransactionError):
    """An attempt was made to modify an object that has
    been modified in an unsaved version"""

class UndoError(POSError):
    """An attempt was made to undo a non-undoable transaction.
    """

class StorageError(POSError):
    pass

class StorageTransactionError(StorageError):
    """An operation was invoked for an invalid transaction or state
    """

class StorageSystemError(StorageError):
    """Panic! Internal storage error!
    """

class MountedStorageError(StorageError):
    """Unable to access mounted storage.
    """

class ExportError(POSError):
    """An export file doesn't have the right format.
    """
    pass

class Unimplemented(POSError):
    """An unimplemented feature was used
    """
    pass

class Unsupported(POSError):
    """An feature that is unsupported bt the storage was used.
    """
    
class InvalidObjectReference(POSError):
    """An object contains an invalid reference to another object.

    An invalid reference may be one of:

    o A reference to a wrapped persistent object.

    o A reference to an object in a different database connection.
    """
