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Merge pull request #3649 from nyalldawson/strip_null
[processing] Add algorithm to strip null geometries
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# -*- coding: utf-8 -*- | ||
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""" | ||
*************************************************************************** | ||
RemoveNullGeometry.py | ||
-------------- | ||
Date : October 2016 | ||
Copyright : (C) 2016 by Nyall Dawson | ||
Email : nyall dot dawson at gmail dot com | ||
*************************************************************************** | ||
* * | ||
* This program is free software; you can redistribute it and/or modify * | ||
* it under the terms of the GNU General Public License as published by * | ||
* the Free Software Foundation; either version 2 of the License, or * | ||
* (at your option) any later version. * | ||
* * | ||
*************************************************************************** | ||
""" | ||
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__author__ = 'Nyall Dawson' | ||
__date__ = 'October 2016' | ||
__copyright__ = '(C) 2016, Nyall Dawson' | ||
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# This will get replaced with a git SHA1 when you do a git archive323 | ||
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__revision__ = '$Format:%H$' | ||
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from processing.core.GeoAlgorithm import GeoAlgorithm | ||
from processing.core.parameters import ParameterVector | ||
from processing.core.outputs import OutputVector | ||
from processing.tools import dataobjects, vector | ||
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class RemoveNullGeometry(GeoAlgorithm): | ||
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INPUT_LAYER = 'INPUT_LAYER' | ||
OUTPUT_LAYER = 'OUTPUT_LAYER' | ||
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def defineCharacteristics(self): | ||
self.name, self.i18n_name = self.trAlgorithm('Remove null geometries') | ||
self.group, self.i18n_group = self.trAlgorithm('Vector selection tools') | ||
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self.addParameter(ParameterVector(self.INPUT_LAYER, | ||
self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_ANY])) | ||
self.addOutput(OutputVector(self.OUTPUT_LAYER, self.tr('Removed null geometry'))) | ||
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def processAlgorithm(self, progress): | ||
layer = dataobjects.getObjectFromUri( | ||
self.getParameterValue(self.INPUT_LAYER)) | ||
writer = self.getOutputFromName( | ||
self.OUTPUT_LAYER).getVectorWriter( | ||
layer.fields(), | ||
layer.wkbType(), | ||
layer.crs()) | ||
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features = vector.features(layer) | ||
total = 100.0 / len(features) | ||
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for current, input_feature in enumerate(features): | ||
if input_feature.constGeometry(): | ||
writer.addFeature(input_feature) | ||
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progress.setPercentage(int(current * total)) | ||
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del writer |