X-Git-Url: https://git.openstreetmap.org./nominatim.git/blobdiff_plain/0c65289a80fb376b9d7e53653e16cef6a8fa781e..d9d8b9c5262ef948d312509b7cf71cdd53791446:/nominatim/api/types.py

diff --git a/nominatim/api/types.py b/nominatim/api/types.py
index 89b81111..0e4340fe 100644
--- a/nominatim/api/types.py
+++ b/nominatim/api/types.py
@@ -7,9 +7,12 @@
 """
 Complex datatypes used by the Nominatim API.
 """
-from typing import Optional, Union, NamedTuple
+from typing import Optional, Union, Tuple, NamedTuple, TypeVar, Type, Dict, Any
 import dataclasses
 import enum
+from struct import unpack
+
+from nominatim.errors import UsageError
 
 @dataclasses.dataclass
 class PlaceID:
@@ -55,6 +58,104 @@ class Point(NamedTuple):
         return self.x
 
 
+    def to_geojson(self) -> str:
+        """ Return the point in GeoJSON format.
+        """
+        return f'{{"type": "Point","coordinates": [{self.x}, {self.y}]}}'
+
+
+    @staticmethod
+    def from_wkb(wkb: bytes) -> 'Point':
+        """ Create a point from EWKB as returned from the database.
+        """
+        if len(wkb) != 25:
+            raise ValueError("Point wkb has unexpected length")
+        if wkb[0] == 0:
+            gtype, srid, x, y = unpack('>iidd', wkb[1:])
+        elif wkb[0] == 1:
+            gtype, srid, x, y = unpack('<iidd', wkb[1:])
+        else:
+            raise ValueError("WKB has unknown endian value.")
+
+        if gtype != 0x20000001:
+            raise ValueError("WKB must be a point geometry.")
+        if srid != 4326:
+            raise ValueError("Only WGS84 WKB supported.")
+
+        return Point(x, y)
+
+
+AnyPoint = Union[Point, Tuple[float, float]]
+
+WKB_BBOX_HEADER_LE = b'\x01\x03\x00\x00\x20\xE6\x10\x00\x00\x01\x00\x00\x00\x05\x00\x00\x00'
+WKB_BBOX_HEADER_BE = b'\x00\x20\x00\x00\x03\x00\x00\x10\xe6\x00\x00\x00\x01\x00\x00\x00\x05'
+
+class Bbox:
+    """ A bounding box in WSG84 projection.
+
+        The coordinates are available as an array in the 'coord'
+        property in the order (minx, miny, maxx, maxy).
+    """
+    def __init__(self, minx: float, miny: float, maxx: float, maxy: float) -> None:
+        self.coords = (minx, miny, maxx, maxy)
+
+
+    @property
+    def minlat(self) -> float:
+        """ Southern-most latitude, corresponding to the minimum y coordinate.
+        """
+        return self.coords[1]
+
+
+    @property
+    def maxlat(self) -> float:
+        """ Northern-most latitude, corresponding to the maximum y coordinate.
+        """
+        return self.coords[3]
+
+
+    @property
+    def minlon(self) -> float:
+        """ Western-most longitude, corresponding to the minimum x coordinate.
+        """
+        return self.coords[0]
+
+
+    @property
+    def maxlon(self) -> float:
+        """ Eastern-most longitude, corresponding to the maximum x coordinate.
+        """
+        return self.coords[2]
+
+
+    @staticmethod
+    def from_wkb(wkb: Optional[bytes]) -> 'Optional[Bbox]':
+        """ Create a Bbox from a bounding box polygon as returned by
+            the database. Return s None if the input value is None.
+        """
+        if wkb is None:
+            return None
+
+        if len(wkb) != 97:
+            raise ValueError("WKB must be a bounding box polygon")
+        if wkb.startswith(WKB_BBOX_HEADER_LE):
+            x1, y1, _, _, x2, y2 = unpack('<dddddd', wkb[17:65])
+        elif wkb.startswith(WKB_BBOX_HEADER_BE):
+            x1, y1, _, _, x2, y2 = unpack('>dddddd', wkb[17:65])
+        else:
+            raise ValueError("WKB has wrong header")
+
+        return Bbox(min(x1, x2), min(y1, y2), max(x1, x2), max(y1, y2))
+
+
+    @staticmethod
+    def from_point(pt: Point, buffer: float) -> 'Bbox':
+        """ Return a Bbox around the point with the buffer added to all sides.
+        """
+        return Bbox(pt[0] - buffer, pt[1] - buffer,
+                    pt[0] + buffer, pt[1] + buffer)
+
+
 class GeometryFormat(enum.Flag):
     """ Geometry output formats supported by Nominatim.
     """
@@ -65,10 +166,22 @@ class GeometryFormat(enum.Flag):
     TEXT = enum.auto()
 
 
+class DataLayer(enum.Flag):
+    """ Layer types that can be selected for reverse and forward search.
+    """
+    POI = enum.auto()
+    ADDRESS = enum.auto()
+    RAILWAY = enum.auto()
+    MANMADE = enum.auto()
+    NATURAL = enum.auto()
+
+
+TParam = TypeVar('TParam', bound='LookupDetails') # pylint: disable=invalid-name
+
 @dataclasses.dataclass
 class LookupDetails:
     """ Collection of parameters that define the amount of details
-        returned with a search result.
+        returned with a lookup or details result.
     """
     geometry_output: GeometryFormat = GeometryFormat.NONE
     """ Add the full geometry of the place to the result. Multiple
@@ -89,3 +202,45 @@ class LookupDetails:
     keywords: bool = False
     """ Add information about the search terms used for this place.
     """
+    geometry_simplification: float = 0.0
+    """ Simplification factor for a geometry in degrees WGS. A factor of
+        0.0 means the original geometry is kept. The higher the value, the
+        more the geometry gets simplified.
+    """
+
+    @classmethod
+    def from_kwargs(cls: Type[TParam], kwargs: Dict[str, Any]) -> TParam:
+        """ Load the data fields of the class from a dictionary.
+            Unknown entries in the dictionary are ignored, missing ones
+            get the default setting.
+
+            The function supports type checking and throws a UsageError
+            when the value does not fit.
+        """
+        def _check_field(v: Any, field: 'dataclasses.Field[Any]') -> Any:
+            if v is None:
+                return field.default_factory() \
+                       if field.default_factory != dataclasses.MISSING \
+                       else field.default
+            if field.metadata and 'transform' in field.metadata:
+                return field.metadata['transform'](v)
+            if not isinstance(v, field.type):
+                raise UsageError(f"Parameter '{field.name}' needs to be of {field.type!s}.")
+            return v
+
+        return cls(**{f.name: _check_field(kwargs[f.name], f)
+                      for f in dataclasses.fields(cls) if f.name in kwargs})
+
+
+@dataclasses.dataclass
+class ReverseDetails(LookupDetails):
+    """ Collection of parameters for the reverse call.
+    """
+    max_rank: int = dataclasses.field(default=30,
+                                      metadata={'transform': lambda v: max(0, min(v, 30))}
+                                     )
+    """ Highest address rank to return.
+    """
+    layers: DataLayer = DataLayer.ADDRESS | DataLayer.POI
+    """ Filter which kind of data to include.
+    """