plomlompom.com Git - plomtask/blob - plomtask/conditions.py

   1 """Non-doable elements of ProcessStep/Todo chains."""
   2 from __future__ import annotations
   3 from typing import Any
   4 from sqlite3 import Row
   5 from plomtask.db import DatabaseConnection, BaseModel
   6 from plomtask.versioned_attributes import VersionedAttribute
   7 from plomtask.exceptions import HandledException
   8
   9
  10 class Condition(BaseModel[int]):
  11     """Non-Process dependency for ProcessSteps and Todos."""
  12     table_name = 'conditions'
  13     to_save = ['is_active']
  14     to_save_versioned = ['title', 'description']
  15
  16     def __init__(self, id_: int | None, is_active: bool = False) -> None:
  17         super().__init__(id_)
  18         self.is_active = is_active
  19         self.title = VersionedAttribute(self, 'condition_titles', 'UNNAMED')
  20         self.description = VersionedAttribute(self, 'condition_descriptions',
  21                                               '')
  22
  23     @classmethod
  24     def from_table_row(cls, db_conn: DatabaseConnection,
  25                        row: Row | list[Any]) -> Condition:
  26         """Build condition from row, including VersionedAttributes."""
  27         condition = super().from_table_row(db_conn, row)
  28         for name in ('title', 'description'):
  29             table_name = f'condition_{name}s'
  30             for row_ in db_conn.row_where(table_name, 'parent', row[0]):
  31                 getattr(condition, name).history_from_row(row_)
  32         return condition
  33
  34     def remove(self, db_conn: DatabaseConnection) -> None:
  35         """Remove from DB, with VersionedAttributes.
  36
  37         Checks for Todos and Processes that depend on Condition, prohibits
  38         deletion if found.
  39         """
  40         if self.id_ is None:
  41             raise HandledException('cannot remove unsaved item')
  42         for item in ('process', 'todo'):
  43             for attr in ('conditions', 'blockers', 'enables', 'disables'):
  44                 table_name = f'{item}_{attr}'
  45                 for _ in db_conn.row_where(table_name, 'condition', self.id_):
  46                     raise HandledException('cannot remove Condition in use')
  47         super().remove(db_conn)
  48
  49
  50 class ConditionsRelations:
  51     """Methods for handling relations to Conditions, for Todo and Process."""
  52
  53     def __init__(self) -> None:
  54         self.conditions: list[Condition] = []
  55         self.blockers: list[Condition] = []
  56         self.enables: list[Condition] = []
  57         self.disables: list[Condition] = []
  58
  59     def set_conditions(self, db_conn: DatabaseConnection, ids: list[int],
  60                        target: str = 'conditions') -> None:
  61         """Set self.[target] to Conditions identified by ids."""
  62         target_list = getattr(self, target)
  63         while len(target_list) > 0:
  64             target_list.pop()
  65         for id_ in ids:
  66             target_list += [Condition.by_id(db_conn, id_)]
  67
  68     def set_blockers(self, db_conn: DatabaseConnection,
  69                      ids: list[int]) -> None:
  70         """Set self.enables to Conditions identified by ids."""
  71         self.set_conditions(db_conn, ids, 'blockers')
  72
  73     def set_enables(self, db_conn: DatabaseConnection,
  74                     ids: list[int]) -> None:
  75         """Set self.enables to Conditions identified by ids."""
  76         self.set_conditions(db_conn, ids, 'enables')
  77
  78     def set_disables(self, db_conn: DatabaseConnection,
  79                      ids: list[int]) -> None:
  80         """Set self.disables to Conditions identified by ids."""
  81         self.set_conditions(db_conn, ids, 'disables')