# SPDX-License-Identifier: GPL-3.0-or-later # # This file is part of Nominatim. (https://nominatim.org) # # Copyright (C) 2023 by the Nominatim developer community. # For a full list of authors see the git log. """ Dataclasses for search results and helper functions to fill them. Data classes are part of the public API while the functions are for internal use only. That's why they are implemented as free-standing functions instead of member functions. """ from typing import Optional, Tuple, Dict, Sequence, Any import enum import dataclasses import datetime as dt import sqlalchemy as sa from nominatim.typing import SaSelect, SaRow from nominatim.api.types import Point, LookupDetails from nominatim.api.connection import SearchConnection # This file defines complex result data classes. # pylint: disable=too-many-instance-attributes class SourceTable(enum.Enum): """ Enumeration of kinds of results. """ PLACEX = 1 OSMLINE = 2 TIGER = 3 POSTCODE = 4 COUNTRY = 5 @dataclasses.dataclass class AddressLine: """ Detailed information about a related place. """ place_id: Optional[int] osm_object: Optional[Tuple[str, int]] category: Tuple[str, str] names: Dict[str, str] extratags: Optional[Dict[str, str]] admin_level: int fromarea: bool isaddress: bool rank_address: int distance: float AddressLines = Sequence[AddressLine] @dataclasses.dataclass class WordInfo: """ Detailed information about a search term. """ word_id: int word_token: str word: Optional[str] = None WordInfos = Sequence[WordInfo] @dataclasses.dataclass class SearchResult: """ Data class collecting all available information about a search result. """ source_table: SourceTable category: Tuple[str, str] centroid: Point place_id : Optional[int] = None parent_place_id: Optional[int] = None linked_place_id: Optional[int] = None osm_object: Optional[Tuple[str, int]] = None admin_level: int = 15 names: Optional[Dict[str, str]] = None address: Optional[Dict[str, str]] = None extratags: Optional[Dict[str, str]] = None housenumber: Optional[str] = None postcode: Optional[str] = None wikipedia: Optional[str] = None rank_address: int = 30 rank_search: int = 30 importance: Optional[float] = None country_code: Optional[str] = None indexed_date: Optional[dt.datetime] = None address_rows: Optional[AddressLines] = None linked_rows: Optional[AddressLines] = None parented_rows: Optional[AddressLines] = None name_keywords: Optional[WordInfos] = None address_keywords: Optional[WordInfos] = None geometry: Dict[str, str] = dataclasses.field(default_factory=dict) @property def lat(self) -> float: """ Get the latitude (or y) of the center point of the place. """ return self.centroid[1] @property def lon(self) -> float: """ Get the longitude (or x) of the center point of the place. """ return self.centroid[0] def calculated_importance(self) -> float: """ Get a valid importance value. This is either the stored importance of the value or an artificial value computed from the place's search rank. """ return self.importance or (0.7500001 - (self.rank_search/40.0)) # pylint: disable=consider-using-f-string def centroid_as_geojson(self) -> str: """ Get the centroid in GeoJSON format. """ return '{"type": "Point","coordinates": [%f, %f]}' % self.centroid def create_from_placex_row(row: SaRow) -> SearchResult: """ Construct a new SearchResult and add the data from the result row from the placex table. """ result = SearchResult(source_table=SourceTable.PLACEX, place_id=row.place_id, parent_place_id=row.parent_place_id, linked_place_id=row.linked_place_id, osm_object=(row.osm_type, row.osm_id), category=(row.class_, row.type), admin_level=row.admin_level, names=row.name, address=row.address, extratags=row.extratags, housenumber=row.housenumber, postcode=row.postcode, wikipedia=row.wikipedia, rank_address=row.rank_address, rank_search=row.rank_search, importance=row.importance, country_code=row.country_code, indexed_date=getattr(row, 'indexed_date'), centroid=Point(row.x, row.y)) result.geometry = {k[9:]: v for k, v in row._mapping.items() # pylint: disable=W0212 if k.startswith('geometry_')} return result async def add_result_details(conn: SearchConnection, result: SearchResult, details: LookupDetails) -> None: """ Retrieve more details from the database according to the parameters specified in 'details'. """ if details.address_details: await complete_address_details(conn, result) if details.linked_places: await complete_linked_places(conn, result) if details.parented_places: await complete_parented_places(conn, result) if details.keywords: await complete_keywords(conn, result) def _result_row_to_address_row(row: SaRow) -> AddressLine: """ Create a new AddressLine from the results of a datbase query. """ extratags: Dict[str, str] = getattr(row, 'extratags', {}) if 'place_type' in row: extratags['place_type'] = row.place_type return AddressLine(place_id=row.place_id, osm_object=(row.osm_type, row.osm_id), category=(getattr(row, 'class'), row.type), names=row.name, extratags=extratags, admin_level=row.admin_level, fromarea=row.fromarea, isaddress=getattr(row, 'isaddress', True), rank_address=row.rank_address, distance=row.distance) async def complete_address_details(conn: SearchConnection, result: SearchResult) -> None: """ Retrieve information about places that make up the address of the result. """ housenumber = -1 if result.source_table in (SourceTable.TIGER, SourceTable.OSMLINE): if result.housenumber is not None: housenumber = int(result.housenumber) elif result.extratags is not None and 'startnumber' in result.extratags: # details requests do not come with a specific house number housenumber = int(result.extratags['startnumber']) sfn = sa.func.get_addressdata(result.place_id, housenumber)\ .table_valued( # type: ignore[no-untyped-call] sa.column('place_id', type_=sa.Integer), 'osm_type', sa.column('osm_id', type_=sa.BigInteger), sa.column('name', type_=conn.t.types.Composite), 'class', 'type', 'place_type', sa.column('admin_level', type_=sa.Integer), sa.column('fromarea', type_=sa.Boolean), sa.column('isaddress', type_=sa.Boolean), sa.column('rank_address', type_=sa.SmallInteger), sa.column('distance', type_=sa.Float)) sql = sa.select(sfn).order_by(sa.column('rank_address').desc(), sa.column('isaddress').desc()) result.address_rows = [] for row in await conn.execute(sql): result.address_rows.append(_result_row_to_address_row(row)) # pylint: disable=consider-using-f-string def _placex_select_address_row(conn: SearchConnection, centroid: Point) -> SaSelect: t = conn.t.placex return sa.select(t.c.place_id, t.c.osm_type, t.c.osm_id, t.c.name, t.c.class_.label('class'), t.c.type, t.c.admin_level, sa.literal_column("""ST_GeometryType(geometry) in ('ST_Polygon','ST_MultiPolygon')""").label('fromarea'), t.c.rank_address, sa.literal_column( """ST_DistanceSpheroid(geometry, 'SRID=4326;POINT(%f %f)'::geometry, 'SPHEROID["WGS 84",6378137,298.257223563, AUTHORITY["EPSG","7030"]]') """ % centroid).label('distance')) async def complete_linked_places(conn: SearchConnection, result: SearchResult) -> None: """ Retrieve information about places that link to the result. """ result.linked_rows = [] if result.source_table != SourceTable.PLACEX: return sql = _placex_select_address_row(conn, result.centroid)\ .where(conn.t.placex.c.linked_place_id == result.place_id) for row in await conn.execute(sql): result.linked_rows.append(_result_row_to_address_row(row)) async def complete_keywords(conn: SearchConnection, result: SearchResult) -> None: """ Retrieve information about the search terms used for this place. """ t = conn.t.search_name sql = sa.select(t.c.name_vector, t.c.nameaddress_vector)\ .where(t.c.place_id == result.place_id) result.name_keywords = [] result.address_keywords = [] for name_tokens, address_tokens in await conn.execute(sql): t = conn.t.word sel = sa.select(t.c.word_id, t.c.word_token, t.c.word) for row in await conn.execute(sel.where(t.c.word_id == sa.any_(name_tokens))): result.name_keywords.append(WordInfo(*row)) for row in await conn.execute(sel.where(t.c.word_id == sa.any_(address_tokens))): result.address_keywords.append(WordInfo(*row)) async def complete_parented_places(conn: SearchConnection, result: SearchResult) -> None: """ Retrieve information about places that the result provides the address for. """ result.parented_rows = [] if result.source_table != SourceTable.PLACEX: return sql = _placex_select_address_row(conn, result.centroid)\ .where(conn.t.placex.c.parent_place_id == result.place_id)\ .where(conn.t.placex.c.rank_search == 30) for row in await conn.execute(sql): result.parented_rows.append(_result_row_to_address_row(row))