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#

# Source code for langchain.docstore.in_memory

    """Simple in memory docstore in the form of a dict."""
    from typing import Dict, Union

    from langchain.docstore.base import AddableMixin, Docstore
    from langchain.docstore.document import Document

    class InMemoryDocstore(Docstore, AddableMixin):
        """Simple in memory docstore in the form of a dict."""

        def __init__(self, _dict: Dict[str, Document]):
            """Initialize with dict."""
            self._dict = _dict

        def add(self, texts: Dict[str, Document]) -> None:
            """Add texts to in memory dictionary."""
            overlapping = set(texts).intersection(self._dict)
            if overlapping:
                raise ValueError(f"Tried to add ids that already exist: {overlapping}")
            self._dict = dict(self._dict, **texts)

        def search(self, search: str) -> Union[str, Document]:
            """Search via direct lookup."""
            if search not in self._dict:
                return f"ID {search} not found."
            else:
                return self._dict[search]