Plugin_SN_Basis/functions/ly_geometry_wrapper.py

# sn_basis/functions/ly_geometry_wrapper.py

from typing import Optional


GEOM_NONE = None
GEOM_POINT = "Point"
GEOM_LINE = "LineString"
GEOM_POLYGON = "Polygon"


def get_layer_geometry_type(layer) -> Optional[str]:
    """
    Gibt den Geometrietyp eines Layers zurück.

    Rückgabewerte:
    - "Point"
    - "LineString"
    - "Polygon"
    - None (nicht räumlich / ungültig / unbekannt)
    """
    if layer is None:
        return None

    try:
        is_spatial = getattr(layer, "isSpatial", None)
        if callable(is_spatial) and not is_spatial():
            return None

        gtype = getattr(layer, "geometryType", None)
        if callable(gtype):
            value = gtype()
            if value == 0:
                return GEOM_POINT
            if value == 1:
                return GEOM_LINE
            if value == 2:
                return GEOM_POLYGON
    except Exception:
        pass

    return None


def get_layer_feature_count(layer) -> int:
    """
    Gibt die Anzahl der Features eines Layers zurück.
    """
    if layer is None:
        return 0

    try:
        is_spatial = getattr(layer, "isSpatial", None)
        if callable(is_spatial) and not is_spatial():
            return 0

        fc = getattr(layer, "featureCount", None)
        if callable(fc):
            value = fc()
            if isinstance(value, int):
                return value
    except Exception:
        pass

    return 0