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"""Treebeard exceptions"""
class InvalidPosition(Exception):
"""Raised when passing an invalid pos value"""
class InvalidMoveToDescendant(Exception):
"""Raised when attempting to move a node to one of it's descendants."""
class NodeAlreadySaved(Exception):
"""
Raised when attempting to add a node which is already saved to the
database.
"""
class MissingNodeOrderBy(Exception):
"""
Raised when an operation needs a missing
:attr:`~treebeard.MP_Node.node_order_by` attribute
"""
class PathOverflow(Exception):
"""
Raised when trying to add or move a node to a position where no more nodes
can be added (see :attr:`~treebeard.MP_Node.path` and
:attr:`~treebeard.MP_Node.alphabet` for more info)
"""
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