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VectorLayer.py
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VectorLayer.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
from qgis.core import (QgsDataSourceURI,
QgsVectorLayer,
QgsExpression,
QgsFeatureRequest,
QgsMapLayerRegistry)
class VectorLayer(QgsVectorLayer):
def __init__(self, *args, **kwargs):
super(VectorLayer, self).__init__(*args, **kwargs)
self._provider = self.dataProvider()
self._name = None
self._epsg = None
self._filter = None
self._encoding = None
self._selection = None
self._field_list = None
@classmethod
def fromLayer(cls, layer, name=None, add_to_legend=False):
''' Transform classical layer into VectorLayer
Usage :
layer = VectorLayer.fromLayer(layer)
layer = VectorLayer.fromLayer(layer, "my layer")
layer = VectorLayer.fromLayer(layer, "my layer", True)
layer = VectorLayer.fromLayer(layer, add_to_legend=True)
layer = VectorLayer.fromLayer(layer,name,add_to_legend)
'''
if layer.__class__ is QgsVectorLayer:
if not name:
name = layer.name()
new_layer = VectorLayer(layer.source(), name,
layer.dataProvider().name())
new_layer.add(add_to_legend)
return new_layer
else:
return None
@classmethod
def activeLayer(cls, name=None, add_to_legend=False):
''' Transform activeLayer into VectorLayer
Usage :
layer = VectorLayer.activeLayer()
layer = VectorLayer.activeLayer("my layer")
layer = VectorLayer.activeLayer(add_to_legend=True)
'''
layer = iface.activeLayer()
return cls.fromLayer(layer, name, add_to_legend)
### name property ###
@property
def name(self):
return super(VectorLayer, self).name()
@name.setter
def name(self, name):
try:
self.setName(name)
except AttributeError:
self.setLayerName(name)
### epsg property ###
@property
def epsg(self):
try:
return int(self._provider.crs().authid().split(":")[1])
except IndexError:
return None
### filter propery ###
@property
def filter(self):
return self._provider.subsetString()
@filter.setter
def filter(self, sql):
self._provider.setSubsetString(sql)
self.reload()
### encoding property ###
@property
def encoding(self):
return self._provider.encoding()
@encoding.setter
def encoding(self, encoding):
self._provider.setEncoding(encoding)
### provider property ###
@property
def provider(self):
return self._provider.name()
### selection property ###
@property
def selection(self):
return self.selectedFeatures()
@selection.setter
def selection(self, expr):
result_it = self.where(expr)
ids = [f.id() for f in result_it]
self.setSelectedFeatures(ids)
### field_list property ###
@property
def field_list(self):
return self.fields()
@selection.setter
def field_list(self, expr):
result_it = self.where(expr)
ids = [f.id() for f in result_it]
self.setSelectedFeatures(ids)
def where(self, exp):
'''Request feature by QgsExpression
Usage :
for feat in layer.where("myfield" = 2):
...
'''
exp = QgsExpression(exp)
if exp.hasParserError():
raise Exception(exp.parserErrorString())
if exp.hasEvalError():
raise ValueError(exp.evalErrorString())
return self.getFeatures(QgsFeatureRequest(exp))
def removeColumn(self):
pass
def add(self, add_to_legend=True):
'''Add the instance to the legend'''
QgsMapLayerRegistry.instance().addMapLayer(self, addToLegend=add_to_legend)
def reload(self):
'''Reload to force mapcanvas refresh'''
self._provider.forceReload()
self.triggerRepaint()