def _get_layer(self, layer):
"""Analyze style of self._function and return appropriate
class of the layer.
:param layer: A layer.
:type layer: QgsMapLayer or SAFE layer.
:returns: The layer of appropriate type
:rtype: SAFE or QgisWrapper
:raises: InsufficientParametersError if self._function is not set,
InvalidParameterError if style of self._function is not
in ('old-style', 'qgis2.0')
Any exceptions raised by other libraries will be propagated.
"""
if self._impact_function is None:
message = self.tr('Error: Impact Function not set.')
raise InsufficientParametersError(message)
# Get type of the impact function (old-style or new-style)
try:
impact_function_type = \
self.impact_function_manager.get_function_type(
self._impact_function)
if impact_function_type == 'old-style':
return convert_to_safe_layer(layer)
elif impact_function_type == 'qgis2.0':
# convert for new style impact function
return QgisWrapper(layer)
else:
message = self.tr('Error: Impact Function has unknown style.')
raise InvalidParameterError(message)
except:
raise
def _get_layer(self, layer):
"""Analyze style of self._function and return appropriate
class of the layer.
:param layer: A layer.
:type layer: QgsMapLayer or SAFE layer.
:returns: The layer of appropriate type
:rtype: SAFE or QgisWrapper
:raises: InsufficientParametersError if self._function is not set,
InvalidParameterError if style of self._function is not
in ('old-style', 'qgis2.0')
Any exceptions raised by other libraries will be propogated.
"""
if self._function is None or self._function == '':
message = self.tr('Error: Function not set.')
raise InsufficientParametersError(message)
# Get type of the impact function (old-style or new-style)
try:
func_type = get_safe_impact_function_type(self._function)
if func_type == 'old-style':
return convert_to_safe_layer(layer)
elif func_type == 'qgis2.0':
# convert for new style impact function
return QgisWrapper(layer)
else:
message = self.tr('Error: Function has unknown style.')
raise InvalidParameterError(message)
except:
raise
def exposure(self, layer):
"""Setter for exposure layer property.
:param layer: exposure layer to be used for the analysis.
:type layer: SafeLayer
"""
if isinstance(layer, SafeLayer):
self._exposure = layer
else:
if self.function_type() == 'old-style':
self._exposure = SafeLayer(convert_to_safe_layer(layer))
elif self.function_type() == 'qgis2.0':
# convert for new style impact function
self._exposure = SafeLayer(layer)
else:
message = tr('Error: Impact Function has unknown style.')
raise Exception(message)
# Update the target field to a non-conflicting one
if self.exposure.is_qgsvectorlayer():
self._target_field = get_non_conflicting_attribute_name(
self.target_field,
self.exposure.layer.dataProvider().fieldNameMap().keys())
def exposure(self, layer):
"""Setter for exposure layer property.
:param layer: exposure layer to be used for the analysis.
:type layer: SafeLayer
"""
if isinstance(layer, SafeLayer):
self._exposure = layer
else:
if self.function_type() == 'old-style':
self._exposure = SafeLayer(convert_to_safe_layer(layer))
elif self.function_type() == 'qgis2.0':
# convert for new style impact function
self._exposure = SafeLayer(layer)
else:
message = tr('Error: Impact Function has unknown style.')
raise Exception(message)
# Update the target field to a non-conflicting one
if self.exposure.is_qgsvectorlayer():
self._target_field = get_non_conflicting_attribute_name(
self.target_field,
self.exposure.layer.dataProvider().fieldNameMap().keys()
)