Diensteabruf integriert

modules/LayerLoader.py

@@ -0,0 +1,395 @@
+"""sn_basis/modules/LayerLoader.py
+
+Kapselt Layer-Erstellung, Raumfilter und Stil-Logik.
+"""
+
+from __future__ import annotations
+
+from typing import Any, Dict, List, Optional
+import time
+
+from sn_basis.functions.os_wrapper import normalize_path, is_absolute_path
+from sn_basis.functions.qgiscore_wrapper import (
+    QgsVectorLayer,
+    QgsRasterLayer,
+    QgsFeatureRequest,
+    QgsProject,
+    QgsNetworkAccessManager,
+    QgsCoordinateTransform,
+)
+from sn_basis.functions.sys_wrapper import get_plugin_root, join_path, file_exists
+from sn_basis.modules.stilpruefer import Stilpruefer
+from sn_basis.modules.layerpruefer import Layerpruefer
+from sn_basis.modules.pruef_ergebnis import pruef_ergebnis
+from sn_basis.functions import qt_wrapper as qt
+
+
+class LayerLoader:
+    """Lädt und filtert Layer aus Dienst-/Datenquellen."""
+
+    def __init__(
+        self,
+        pruefmanager: Any,
+        stil_pruefer: Optional[Stilpruefer] = None,
+        layer_pruefer: Optional[Layerpruefer] = None,
+    ) -> None:
+        self.pruefmanager = pruefmanager
+        self.stil_pruefer = stil_pruefer or Stilpruefer()
+        self.layer_pruefer = layer_pruefer or Layerpruefer()
+
+    _LAYER_TIMEOUT_MS = 30_000  # 30 Sekunden
+
+    def _was_canceled(self, cancel_callback: Optional[Any]) -> bool:
+        if not callable(cancel_callback):
+            return False
+        try:
+            return bool(cancel_callback())
+        except Exception:
+            return False
+
+    def _process_events(self) -> None:
+        try:
+            if hasattr(qt, "QCoreApplication") and hasattr(qt.QCoreApplication, "processEvents"):
+                qt.QCoreApplication.processEvents()
+        except Exception:
+            pass
+
+    def _transform_geometry_to_layer_crs(self, geometry: Any, source_layer: Any, target_layer: Any) -> Any:
+        if geometry is None or source_layer is None or target_layer is None:
+            return geometry
+
+        if QgsCoordinateTransform is None or QgsProject is None:
+            return geometry
+
+        try:
+            source_crs = source_layer.crs() if hasattr(source_layer, "crs") else None
+            target_crs = target_layer.crs() if hasattr(target_layer, "crs") else None
+            if source_crs is None or target_crs is None:
+                return geometry
+
+            source_authid = source_crs.authid() if hasattr(source_crs, "authid") else None
+            target_authid = target_crs.authid() if hasattr(target_crs, "authid") else None
+            if source_authid and target_authid and source_authid == target_authid:
+                return geometry
+
+            ct = QgsCoordinateTransform(source_crs, target_crs, QgsProject.instance())
+            if hasattr(geometry, "clone") and callable(getattr(geometry, "clone")):
+                geom_copy = geometry.clone()
+            else:
+                geom_copy = geometry
+            geom_copy.transform(ct)
+            return geom_copy
+        except Exception:
+            return geometry
+
+    def _transform_extent_to_layer_crs(self, extent: Any, source_layer: Any, target_layer: Any) -> Any:
+        if extent is None or source_layer is None or target_layer is None:
+            return extent
+
+        if QgsCoordinateTransform is None or QgsProject is None:
+            return extent
+
+        try:
+            source_crs = source_layer.crs() if hasattr(source_layer, "crs") else None
+            target_crs = target_layer.crs() if hasattr(target_layer, "crs") else None
+            if source_crs is None or target_crs is None:
+                return extent
+
+            source_authid = source_crs.authid() if hasattr(source_crs, "authid") else None
+            target_authid = target_crs.authid() if hasattr(target_crs, "authid") else None
+            if source_authid and target_authid and source_authid == target_authid:
+                return extent
+
+            ct = QgsCoordinateTransform(source_crs, target_crs, QgsProject.instance())
+            if hasattr(ct, "transformBoundingBox"):
+                return ct.transformBoundingBox(extent)
+            return extent
+        except Exception:
+            return extent
+
+    def create_layer(self, provider: str, link: str, thema: str) -> Optional[QgsVectorLayer]:
+        provider_lower = provider.lower() if provider else ""
+        layer = None
+
+        # Netzwerk-Timeout für alle netzwerkbasierten Provider setzen
+        if provider_lower in ("wfs", "wms", "rest"):
+            try:
+                nam = QgsNetworkAccessManager.instance()
+                if hasattr(nam, "setTimeout"):
+                    nam.setTimeout(self._LAYER_TIMEOUT_MS)
+            except Exception:
+                pass
+
+        try:
+            if provider_lower == "wfs":
+                uri = link if link.strip().lower().startswith("url=") else f"url={link}"
+                layer = QgsVectorLayer(uri, thema, "WFS")
+            elif provider_lower == "wms":
+                uri = link if link.strip().lower().startswith("url=") else f"url={link}"
+                layer = QgsRasterLayer(uri, thema, "wms")
+            elif provider_lower in ("ogr", "gpkg", "shp", "geojson"):
+                layer = QgsVectorLayer(link, thema, "ogr")
+            elif provider_lower == "rest":
+                rest_link = link.strip()
+                if rest_link.lower().endswith("/featureserver"):
+                    rest_link = rest_link.rstrip("/") + "/0"
+                uri = rest_link if rest_link.lower().startswith("url=") else f"url={rest_link}"
+                layer = QgsVectorLayer(uri, thema, "arcgisfeatureserver")
+            else:
+                layer = QgsVectorLayer(link, thema, "ogr")
+        except Exception as exc:
+            self.pruefmanager.verarbeite(
+                pruef_ergebnis(
+                    ok=False,
+                    meldung=f"Fehler beim Erstellen des Layers {thema}: {exc}",
+                    aktion="layer_nicht_verfuegbar",
+                    kontext={"provider": provider, "link": link},
+                )
+            )
+            return None
+
+        if not layer or not layer.isValid():
+            self.pruefmanager.verarbeite(
+                pruef_ergebnis(
+                    ok=False,
+                    meldung=f"Layer {thema} (Provider={provider}) konnte nicht geladen werden."
+                    ,aktion="layer_nicht_verfuegbar",
+                    kontext={"provider": provider, "link": link},
+                )
+            )
+            return None
+
+        return layer
+
+    def apply_style(self, layer: QgsVectorLayer, style_path: Optional[str]) -> None:
+        if not style_path or layer is None or not layer.isValid():
+            return
+
+        if not style_path.strip():
+            return
+
+        if not is_absolute_path(style_path):
+            plugin_root = get_plugin_root()
+            style_path = str(join_path(plugin_root, "sn_plan41", "assets", style_path))
+
+        # normalize path for consistency
+        style_path = str(normalize_path(style_path))
+
+        # Debug: welche Stil-Datei wird geprüft?
+        print(f"[LayerLoader] Überprüfe Stildatei: '{style_path}'")
+
+        if file_exists(style_path):
+            try:
+                layer.loadNamedStyle(style_path)
+                layer.triggerRepaint()
+            except Exception as exc:
+                self.pruefmanager.verarbeite(
+                    pruef_ergebnis(
+                        ok=False,
+                        meldung=f"Fehler beim Stil-Laden für {layer.name()}: {exc}",
+                        aktion="stil_laden_fehlgeschlagen",
+                        kontext={"thema": layer.name(), "style_path": style_path},
+                    )
+                )
+        else:
+            self.pruefmanager.verarbeite(
+                pruef_ergebnis(
+                    ok=True,
+                    meldung=f"Stildatei nicht gefunden (optional): {style_path}",
+                    aktion="stil_nicht_gefunden",
+                    kontext={"thema": layer.name(), "style_path": style_path},
+                )
+            )
+
+    def filter_by_extent(self, layer: QgsVectorLayer, extent, cancel_callback: Optional[Any] = None, source_layer: Optional[Any] = None) -> Optional[QgsVectorLayer]:
+        """Beschneidet <layer> auf die rechteckige Ausdehnung <extent>.
+
+        Diese Methode verwendet einen einfachen BBOX-Filter. Für komplexere
+        Raumeinschränkungen (z.B. Verfahrensgebiet) sollte stattdessen
+        :meth:`filter_by_layer` verwendet werden, da dort echte Geometrie-Tests
+        stattfinden.
+        """
+        if not layer or not layer.isValid() or extent is None:
+            return layer
+
+        if layer.type() != QgsVectorLayer.VectorLayer:
+            return layer
+
+        extent_for_layer = self._transform_extent_to_layer_crs(extent, source_layer, layer)
+        request = QgsFeatureRequest().setFilterRect(extent_for_layer)
+        if hasattr(request, "setTimeout"):
+            try:
+                request.setTimeout(self._LAYER_TIMEOUT_MS)
+            except Exception:
+                pass
+
+        start = time.monotonic()
+        features: List[Any] = []
+        try:
+            for feat in layer.getFeatures(request):
+                if self._was_canceled(cancel_callback):
+                    self.pruefmanager.verarbeite(
+                        pruef_ergebnis(
+                            ok=False,
+                            meldung=f"Abbruch beim Raumfilter (BBOX) für {layer.name()}",
+                            aktion="needs_user_action",
+                            kontext={"thema": layer.name()},
+                        )
+                    )
+                    return None
+
+                elapsed_ms = int((time.monotonic() - start) * 1000)
+                if elapsed_ms >= self._LAYER_TIMEOUT_MS:
+                    self.pruefmanager.verarbeite(
+                        pruef_ergebnis(
+                            ok=False,
+                            meldung=f"Timeout beim Raumfilter (BBOX) für {layer.name()} nach {self._LAYER_TIMEOUT_MS // 1000}s",
+                            aktion="url_nicht_erreichbar",
+                            kontext={"thema": layer.name(), "timeout_s": self._LAYER_TIMEOUT_MS // 1000},
+                        )
+                    )
+                    return None
+
+                features.append(feat)
+                if len(features) % 100 == 0:
+                    self._process_events()
+        except Exception as exc:
+            self.pruefmanager.verarbeite(
+                pruef_ergebnis(
+                    ok=False,
+                    meldung=f"Fehler beim Lesen der Features für {layer.name()}: {exc}",
+                    aktion="layer_nicht_verfuegbar",
+                    kontext={"thema": layer.name()},
+                )
+            )
+            return None
+
+        if not features:
+            return None
+
+        geom_type_map = {0: "Point", 1: "LineString", 2: "Polygon"}
+        geom_type = geom_type_map.get(layer.geometryType(), "Polygon")
+        uri = f"{geom_type}?crs={layer.crs().authid()}"
+        filtered_layer = QgsVectorLayer(uri, f"{layer.name()}_bbox", "memory")
+        if not filtered_layer or not filtered_layer.isValid():
+            self.pruefmanager.verarbeite(
+                pruef_ergebnis(
+                    ok=False,
+                    meldung=f"Fehler beim Erzeugen des Filter-Layers für {layer.name()}",
+                    aktion="filterlayer_nicht_erzeugt",
+                    kontext={"thema": layer.name()},
+                )
+            )
+            return None
+
+        provider = filtered_layer.dataProvider()
+        provider.addAttributes(layer.fields())
+        filtered_layer.updateFields()
+        provider.addFeatures(features)
+        filtered_layer.updateExtents()
+
+        return filtered_layer
+
+    def filter_by_layer(self, layer: QgsVectorLayer, filter_layer: QgsVectorLayer, cancel_callback: Optional[Any] = None) -> Optional[QgsVectorLayer]:
+        """Beschneidet <layer> auf die tatsächliche Geometrie des
+        <filter_layer>.
+
+        Diese Methode wird z.B. für das Verfahrensgebiet verwendet, damit nicht
+        die gesamte Bounding-Box, sondern nur die echten Flächen als Raumfilter
+        gelten. Wenn der Filter-Layer mehrere Features enthält, werden deren
+        Geometrien zu einem Multi-Geom vereinigt.
+        """
+        if not layer or not layer.isValid() or not filter_layer or not filter_layer.isValid():
+            return layer
+
+        if layer.type() != QgsVectorLayer.VectorLayer:
+            return layer
+
+        # vereinigte Geometrie aller Features im Filter-Layer
+        union_geom = None
+        for f in filter_layer.getFeatures():
+            try:
+                geom = self._transform_geometry_to_layer_crs(f.geometry(), filter_layer, layer)
+                if union_geom is None:
+                    union_geom = geom
+                else:
+                    union_geom = union_geom.combine(geom)
+            except Exception:
+                # bei einem Fehler einfach weiterfahren
+                continue
+
+        if union_geom is None or union_geom.isEmpty():
+            return None
+
+        # nun alle Features aus <layer> nehmen, deren Geometrie sich schneidet
+        filtered = []
+        request = QgsFeatureRequest().setFilterRect(union_geom.boundingBox())
+        if hasattr(request, "setTimeout"):
+            try:
+                request.setTimeout(self._LAYER_TIMEOUT_MS)
+            except Exception:
+                pass
+
+        start = time.monotonic()
+        for f in layer.getFeatures(request):
+            if self._was_canceled(cancel_callback):
+                self.pruefmanager.verarbeite(
+                    pruef_ergebnis(
+                        ok=False,
+                        meldung=f"Abbruch beim Raumfilter (Geometrie) für {layer.name()}",
+                        aktion="needs_user_action",
+                        kontext={"thema": layer.name()},
+                    )
+                )
+                return None
+
+            elapsed_ms = int((time.monotonic() - start) * 1000)
+            if elapsed_ms >= self._LAYER_TIMEOUT_MS:
+                self.pruefmanager.verarbeite(
+                    pruef_ergebnis(
+                        ok=False,
+                        meldung=f"Timeout beim Raumfilter (Geometrie) für {layer.name()} nach {self._LAYER_TIMEOUT_MS // 1000}s",
+                        aktion="url_nicht_erreichbar",
+                        kontext={"thema": layer.name(), "timeout_s": self._LAYER_TIMEOUT_MS // 1000},
+                    )
+                )
+                return None
+
+            try:
+                if f.geometry() and f.geometry().intersects(union_geom):
+                    filtered.append(f)
+            except Exception:
+                continue
+
+            if len(filtered) % 100 == 0:
+                self._process_events()
+
+        if not filtered:
+            return None
+
+        geom_type_map = {0: "Point", 1: "LineString", 2: "Polygon"}
+        geom_type = geom_type_map.get(layer.geometryType(), "Polygon")
+        uri = f"{geom_type}?crs={layer.crs().authid()}"
+        filtered_layer = QgsVectorLayer(uri, f"{layer.name()}_filtered", "memory")
+        if not filtered_layer or not filtered_layer.isValid():
+            self.pruefmanager.verarbeite(
+                pruef_ergebnis(
+                    ok=False,
+                    meldung=f"Fehler beim Erzeugen des Filter-Layers für {layer.name()}",
+                    aktion="filterlayer_nicht_erzeugt",
+                    kontext={"thema": layer.name()},
+                )
+            )
+            return None
+
+        provider = filtered_layer.dataProvider()
+        provider.addAttributes(layer.fields())
+        filtered_layer.updateFields()
+        provider.addFeatures(filtered)
+        filtered_layer.updateExtents()
+
+        return filtered_layer
+
+    def add_to_project(self, layer: QgsVectorLayer) -> None:
+        if layer and layer.isValid():
+            QgsProject.instance().addMapLayer(layer)