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 = getSafeImpactFunctionType(self._function)
if func_type == 'old-style':
return convertToSafeLayer(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 requires_clipping(self):
"""Check to clip or not to clip layers.
If self._function is a 'new-style' impact function, then
return False -- clipping is unnecessary, else return True
:returns: To clip or not to clip.
:rtype: bool
:raises: InsufficientParametersError if function parameter is not set.
InvalidParameterError if the function has unknown style.
"""
f = self.function()
if f is None:
message = self.tr('Error: Function is not provided.')
raise InsufficientParametersError(message)
style = getSafeImpactFunctionType(f)
if style == 'old-style':
return True
elif style == 'qgis2.0':
return False
else:
message = self.tr('Error: Function has unknown style.')
raise InvalidParameterError(message)
def requires_clipping(self):
"""Check to clip or not to clip layers.
If self._function is a 'new-style' impact function, then
return False -- clipping is unnecessary, else return True
:returns: To clip or not to clip.
:rtype: bool
:raises: InsufficientParametersError if function parameter is not set.
InvalidParameterError if the function has unknown style.
"""
f = self.function()
if f is None:
message = self.tr('Error: Function is not provided.')
raise InsufficientParametersError(message)
style = getSafeImpactFunctionType(f)
if style == 'old-style':
return True
elif style == 'qgis2.0':
return False
else:
message = self.tr('Error: Function has unknown style.')
raise InvalidParameterError(message)
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 = getSafeImpactFunctionType(self._function)
if func_type == 'old-style':
return convertToSafeLayer(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 _convert_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: convertToSafeLayer
: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.
"""
# FIXME (DK): I'm not sure that it is good place for the
# converting function. May be safe_qgis.safe_interface is better.
# But I don't like pass information about function style to other
# modules: I prefer keep only one place of function style analysis
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 = getSafeImpactFunctionType(self._function)
if func_type == 'old-style':
return convertToSafeLayer(layer)
elif func_type == 'qgis2.0':
# TODO (DK): convert for new style impact function
return convertToSafeLayer(layer)
else:
message = self.tr('Error: Function has unknown style.')
raise InvalidParameterError(message)
except:
raise
