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44 lines
1.5 KiB
Python
44 lines
1.5 KiB
Python
# SPDX-License-Identifier: GPL-3.0-or-later
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#
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# This file is part of Nominatim. (https://nominatim.org)
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#
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# Copyright (C) 2023 by the Nominatim developer community.
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# For a full list of authors see the git log.
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"""
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Factory for creating a query analyzer for the configured tokenizer.
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"""
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from typing import List, cast
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from abc import ABC, abstractmethod
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from pathlib import Path
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import importlib
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from nominatim.api.logging import log
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from nominatim.api.connection import SearchConnection
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from nominatim.api.search.query import Phrase, QueryStruct
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class AbstractQueryAnalyzer(ABC):
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""" Class for analysing incomming queries.
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Query analyzers are tied to the tokenizer used on import.
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"""
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@abstractmethod
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async def analyze_query(self, phrases: List[Phrase]) -> QueryStruct:
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""" Analyze the given phrases and return the tokenized query.
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"""
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async def make_query_analyzer(conn: SearchConnection) -> AbstractQueryAnalyzer:
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""" Create a query analyzer for the tokenizer used by the database.
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"""
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name = await conn.get_property('tokenizer')
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src_file = Path(__file__).parent / f'{name}_tokenizer.py'
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if not src_file.is_file():
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log().comment(f"No tokenizer named '{name}' available. Database not set up properly.")
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raise RuntimeError('Tokenizer not found')
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module = importlib.import_module(f'nominatim.api.search.{name}_tokenizer')
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return cast(AbstractQueryAnalyzer, await module.create_query_analyzer(conn))
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