create date serialisation

src/dsp_tools/commands/xmlupload/models/serialise/serialise_value.py

@@ -6,6 +6,11 @@
 from dataclasses import dataclass
 from typing import Any
 
+from dsp_tools.utils.date_util import Date
+from dsp_tools.utils.date_util import DayMonthYearEra
+from dsp_tools.utils.date_util import SingleDate
+from dsp_tools.utils.date_util import StartEnd
+
 
 @dataclass(frozen=True)
 class SerialiseProperty:
@@ -48,6 +53,29 @@ def serialise(self) -> dict[str, Any]:
         return serialised
 
 
+class SerialiseDateValue(SerialiseValue):
+    """A DateValue to be serialised."""
+
+    value: Date
+
+    def serialise(self) -> dict[str, Any]:
+        serialised = self._get_one_date_dict(self.value.start, StartEnd.START)
+
+
+    def _get_one_date_dict(self, date: SingleDate, start_end: StartEnd) -> dict[str, str]:
+        def get_prop(precision: DayMonthYearEra) -> str:
+            return f"knora-api:dateValueHas{start_end!s}{precision!s}"
+
+        date_dict = {get_prop(DayMonthYearEra.YEAR): date.year} if date.year else {}
+        if date.month:
+            date_dict[get_prop(DayMonthYearEra.MONTH)] = date.month
+        if date.day:
+            date_dict[get_prop(DayMonthYearEra.DAY)] = date.day
+        if date.era:
+            date_dict[get_prop(DayMonthYearEra.ERA)] = date.era
+        return date_dict
+
+
 class SerialiseDecimal(SerialiseValue):
     """A DecimalValue to be serialised."""
 

src/dsp_tools/utils/date_util.py

@@ -70,6 +70,18 @@ def from_string(s: str) -> Era:
                 raise BaseError(f"Invalid era type: {s}")
 
 
+class DayMonthYearEra(Enum):
+    DAY = "Day"
+    MONTH = "Month"
+    YEAR = "Year"
+    ERA = "Era"
+
+
+class StartEnd(Enum):
+    START = "Start"
+    END = "End"
+
+
 @dataclass(frozen=True)
 class SingleDate:
     """Information about a single date."""