chore: import upstream snapshot with attribution

python/semantic_kernel/memory/null_memory.py

@@ -0,0 +1,60 @@
+# Copyright (c) Microsoft. All rights reserved.
+
+import sys
+
+from semantic_kernel.memory.memory_query_result import MemoryQueryResult
+from semantic_kernel.memory.semantic_text_memory_base import SemanticTextMemoryBase
+
+if sys.version_info >= (3, 13):
+    from warnings import deprecated
+else:
+    from typing_extensions import deprecated
+
+
+@deprecated("This class will be removed in a future version.")
+class NullMemory(SemanticTextMemoryBase):
+    """Class for null memory."""
+
+    async def save_information(
+        self,
+        collection: str,
+        text: str,
+        id: str,
+        description: str | None = None,
+        additional_metadata: str | None = None,
+    ) -> None:
+        """Nullifies behavior of SemanticTextMemoryBase save_information."""
+        return
+
+    async def save_reference(
+        self,
+        collection: str,
+        text: str,
+        external_id: str,
+        external_source_name: str,
+        description: str | None = None,
+        additional_metadata: str | None = None,
+    ) -> None:
+        """Nullifies behavior of SemanticTextMemoryBase save_reference."""
+        return
+
+    async def get(self, collection: str, query: str) -> MemoryQueryResult | None:
+        """Nullifies behavior of SemanticTextMemoryBase get."""
+        return None
+
+    async def search(
+        self,
+        collection: str,
+        query: str,
+        limit: int = 1,
+        min_relevance_score: float = 0.7,
+    ) -> list[MemoryQueryResult]:
+        """Nullifies behavior of SemanticTextMemoryBase search."""
+        return []
+
+    async def get_collections(self) -> list[str]:
+        """Nullifies behavior of SemanticTextMemoryBase get_collections."""
+        return []
+
+
+NullMemory.instance = NullMemory()  # type: ignore