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| computeFieldIndex = layer.fieldNameIndex('population') | |
| allFieldsMap = layer.pendingFields() | |
| expression = QgsExpression('"affected" = 1') | |
| expression.prepare(allFieldsMap) | |
| if expression.hasParserError(): | |
| raise Exception('Parser error !!') | |
| def getFeatures(): | |
| if self.selectedOnly: | |
| # Just return the selected features | |
| return layer.selectedFeatures() | |
| else: | |
| # Select all the features | |
| layer.select(allFieldsMap) | |
| # The layer is an iterator that returns a QgsFeature on next() | |
| # so just return the layer | |
| return layer | |
| # Loop the features. | |
| for feature in getFeatures(): | |
| result = expression.evaluate(feature) | |
| if expression.hasEvalError(): | |
| raise Exception('Eval error !!') | |
| continue | |
| if result.toBool(): | |
| total += feature.attributeMap()[computeFieldIndex].toDouble()[0] |
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