Create serialise_rdf_value.py

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

@@ -0,0 +1,50 @@
+from abc import ABC
+from abc import abstractmethod
+from dataclasses import dataclass
+from typing import Any
+
+from rdflib import RDF
+from rdflib import BNode
+from rdflib import Graph
+from rdflib import Literal
+from rdflib import Namespace
+from rdflib import URIRef
+
+KNORA_API = Namespace("http://api.knora.org/ontology/knora-api/v2#")
+
+
+@dataclass(frozen=True)
+class ValueRDF(ABC):
+    resource_bn: BNode
+    prop_name: URIRef
+    value: Literal | URIRef
+    permissions: Literal | None
+    comment: Literal | None
+
+    def serialise(self) -> dict[str, Any]:
+        """Serialises the value."""
+
+    @abstractmethod
+    def _as_graph(self) -> Graph:
+        """Creates the value as rdflib graph"""
+
+    def _add_optional_triples(self, val_bn: BNode) -> Graph:
+        g = Graph()
+        if self.permissions:
+            g.add((val_bn, KNORA_API.hasPermissions, self.permissions))
+        if self.comment:
+            g.add((val_bn, KNORA_API.valueHasComment, self.comment))
+        return g
+
+
+class IntValueRDF(ValueRDF):
+    value: Literal
+
+    def _as_graph(self) -> Graph:
+        g = Graph()
+        val_bn = BNode()
+        g.add((val_bn, RDF.type, KNORA_API.IntValue))
+        g.add((val_bn, KNORA_API.intValueAsInt, self.value))
+        g += self._add_optional_triples(val_bn)
+        g.add((self.resource_bn, self.prop_name, val_bn))
+        return g