add a switch converter

__init__.py

@@ -11,4 +11,5 @@
     RelationToManyMap,
     RelationToOne,
 )
+from .switch import Switch  # noqa: F401
 from .xref import Xref  # noqa: F401

switch.py

+from typing import Any, Callable, List, Mapping, Optional, Tuple
+
+from odoo import models
+
+from .base import ContextBuilder, Converter
+
+
+class Switch(Converter):
+    # example usage:
+    # AURION_REFERENTIAL: Switch(
+    #     [(lambda e: e.is_xxx, DictConverter("__wave__", {})),
+    #     (None, DictConverter("__event__", {}))]
+    #     )
+    def __init__(
+        self,
+        converters: List[Tuple[Callable, Converter]],
+        context: Optional[ContextBuilder] = None,
+    ):
+
+        super()
+        self._converters = converters
+        self.context = context
+
+    def odoo_to_message(
+        self, instance: models.Model, ctx: Optional[Mapping] = None
+    ) -> Any:
+
+        for cond, converter in self._converters:
+            if cond is None or cond(instance):
+                return converter.odoo_to_message(self, instance, ctx)
+
+        # raise or return None

tests/test_switch.py

+##############################################################################
+#
+#    Converter, for Odoo
+#    Copyright (C) 2021 XCG Consulting <https://odoo.consulting>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero General Public License as
+#    published by the Free Software Foundation, either version 3 of the
+#    License, or (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+##############################################################################
+from odoo import tests
+
+from odoo.addons.converter import DictConverter, Field, Switch
+
+
+class Test(tests.TransactionCase):
+    def setUp(self):
+        super(Test, self).setUp()
+
+    def test_to_message(self):
+        # first make sure we have an instance to test on
+        self.assertTrue(self.env.ref("base.bank_bnp").active)
+
+        converter = Switch(
+            [
+                (
+                    lambda e: e.active,
+                    DictConverter(
+                        "__activebanks__",
+                        {"name": Field("name"), "active": Field("active")},
+                    ),
+                ),
+                (
+                    None,
+                    DictConverter(
+                        "__inactivebanks__",
+                        {"name": Field("name"), "active": Field("active")},
+                    ),
+                ),
+            ]
+        )
+
+        msg = converter.odoo_to_message()
+        self.assertEqual("__activebanks__", msg.get("type"))