# sec_interp.core.validation.layer_validator module

Spatial validation for QGIS layers (geometry types, CRS).

sec_interp.core.validation.layer_validator.validate_layer_exists(layer_name: str | None) → tuple[bool, str, QgsMapLayer | None]

  Validate that a layer with the given name exists in the current QGIS project.

  Parameters:

    layer_name – The name of the layer to search for.

  Returns:

    (is_valid, error_message, layer)

      - is_valid: True if at least one matching layer was found.

      - error_message: Error details if no layer was found.

      - layer: The first matching layer instance if valid, else None.

  Return type:

    tuple

sec_interp.core.validation.layer_validator.validate_layer_has_features(layer: qgis.core.QgsVectorLayer) → tuple[bool, str]

  Validate that a vector layer contains at least one feature.

  Parameters:

    layer – The QGIS vector layer to check.

  Returns:

    (is_valid, error_message)

      - is_valid: True if the layer has features.

      - error_message: Error details if the layer is empty.

  Return type:

    tuple

sec_interp.core.validation.layer_validator.validate_layer_geometry(layer: qgis.core.QgsVectorLayer, expected_type: qgis.core.QgsWkbTypes.GeometryType) → tuple[bool, str]

  Validate that a vector layer matches the expected QGIS geometry type.

  Parameters:

    - layer – The QGIS vector layer to check.

    - expected_type – The required QgsWkbTypes.GeometryType.

  Returns:

    (is_valid, error_message)

      - is_valid: True if the geometry type matches.

      - error_message: Detailed error if types mismatch.

  Return type:

    tuple

sec_interp.core.validation.layer_validator.validate_raster_band(layer: qgis.core.QgsRasterLayer, band_number: int) → tuple[bool, str]

  Validate that a specified band number exists in the given raster layer.

  Parameters:

    - layer – The QGIS raster layer to check.

    - band_number – The 1-based index of the raster band.

  Returns:

    (is_valid, error_message)

      - is_valid: True if the band exists.

      - error_message: Error message if the band is out of range.

  Return type:

    tuple

sec_interp.core.validation.layer_validator.validate_structural_requirements(layer: qgis.core.QgsVectorLayer, layer_name: str, dip_field: str | None, strike_field: str | None) → tuple[bool, str]

  Validate structural layer requirements (geometry and attribute fields).

  Parameters:

    - layer – The QGIS point layer containing structural data.

    - layer_name – Human-readable name of the layer.

    - dip_field – Name of the attribute field containing dip values.

    - strike_field – Name of the attribute field containing strike values.

  Returns:

    (is_valid, error_message)

      - is_valid: True if both geometry and fields are valid.

      - error_message: Detailed error if validation fails.

  Return type:

    tuple

sec_interp.core.validation.layer_validator.validate_crs_compatibility(layers: list[qgis.core.QgsMapLayer]) → tuple[bool, str]

  Validate that a list of layers have compatible Coordinate Reference Systems.

  If layers have different CRSs, it returns a warning message instead of an error.