mirror of
https://github.com/qgis/QGIS.git
synced 2025-02-28 00:17:30 -05:00
100 lines
3.6 KiB
Python
100 lines
3.6 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
DeleteColumn.py
|
|
---------------------
|
|
Date : May 2010
|
|
Copyright : (C) 2010 by Michael Minn
|
|
Email : pyqgis at michaelminn 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. *
|
|
* *
|
|
***************************************************************************
|
|
"""
|
|
|
|
__author__ = 'Michael Minn'
|
|
__date__ = 'May 2010'
|
|
__copyright__ = '(C) 2010, Michael Minn'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
from qgis.core import (QgsApplication,
|
|
QgsProcessingUtils)
|
|
from processing.core.GeoAlgorithm import GeoAlgorithm
|
|
from processing.core.parameters import ParameterVector
|
|
from processing.core.parameters import ParameterTableField
|
|
from processing.core.outputs import OutputVector
|
|
|
|
|
|
class DeleteColumn(GeoAlgorithm):
|
|
|
|
INPUT = 'INPUT'
|
|
COLUMNS = 'COLUMN'
|
|
OUTPUT = 'OUTPUT'
|
|
|
|
def icon(self):
|
|
return QgsApplication.getThemeIcon("/providerQgis.svg")
|
|
|
|
def svgIconPath(self):
|
|
return QgsApplication.iconPath("providerQgis.svg")
|
|
|
|
def tags(self):
|
|
return self.tr('drop,delete,remove,fields,columns,attributes').split(',')
|
|
|
|
def group(self):
|
|
return self.tr('Vector table tools')
|
|
|
|
def name(self):
|
|
return 'deletecolumn'
|
|
|
|
def displayName(self):
|
|
return self.tr('Delete column')
|
|
|
|
def defineCharacteristics(self):
|
|
self.addParameter(ParameterVector(self.INPUT,
|
|
self.tr('Input layer')))
|
|
self.addParameter(ParameterTableField(self.COLUMNS,
|
|
self.tr('Fields to delete'), self.INPUT, multiple=True))
|
|
self.addOutput(OutputVector(self.OUTPUT, self.tr('Output layer')))
|
|
|
|
def processAlgorithm(self, context, feedback):
|
|
layer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT), context)
|
|
|
|
fields_to_delete = self.getParameterValue(self.COLUMNS).split(';')
|
|
fields = layer.fields()
|
|
field_indices = []
|
|
# loop through twice - first we need to build up a list of original attribute indices
|
|
for f in fields_to_delete:
|
|
index = fields.lookupField(f)
|
|
field_indices.append(index)
|
|
|
|
# important - make sure we remove from the end so we aren't changing used indices as we go
|
|
field_indices.sort(reverse=True)
|
|
|
|
# this second time we make a cleaned version of the fields
|
|
for index in field_indices:
|
|
fields.remove(index)
|
|
|
|
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields, layer.wkbType(), layer.crs(), context)
|
|
|
|
features = QgsProcessingUtils.getFeatures(layer, context)
|
|
total = 100.0 / QgsProcessingUtils.featureCount(layer, context)
|
|
|
|
for current, f in enumerate(features):
|
|
attributes = f.attributes()
|
|
for index in field_indices:
|
|
del attributes[index]
|
|
f.setAttributes(attributes)
|
|
writer.addFeature(f)
|
|
|
|
feedback.setProgress(int(current * total))
|
|
|
|
del writer
|