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105 lines
4.1 KiB
Python
105 lines
4.1 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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AddTableField.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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from qgis.PyQt.QtCore import QVariant
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from qgis.core import (QgsField,
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QgsProcessing,
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QgsProcessingParameterString,
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QgsProcessingParameterNumber,
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QgsProcessingParameterEnum,
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QgsProcessingFeatureSource)
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from processing.algs.qgis.QgisAlgorithm import QgisFeatureBasedAlgorithm
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class AddTableField(QgisFeatureBasedAlgorithm):
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FIELD_NAME = 'FIELD_NAME'
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FIELD_TYPE = 'FIELD_TYPE'
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FIELD_LENGTH = 'FIELD_LENGTH'
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FIELD_PRECISION = 'FIELD_PRECISION'
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TYPES = [QVariant.Int, QVariant.Double, QVariant.String]
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def group(self):
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return self.tr('Vector table')
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def groupId(self):
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return 'vectortable'
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def __init__(self):
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super().__init__()
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self.type_names = [self.tr('Integer'),
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self.tr('Float'),
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self.tr('String')]
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self.field = None
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def initParameters(self, config=None):
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self.addParameter(QgsProcessingParameterString(self.FIELD_NAME,
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self.tr('Field name')))
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self.addParameter(QgsProcessingParameterEnum(self.FIELD_TYPE,
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self.tr('Field type'), self.type_names))
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self.addParameter(QgsProcessingParameterNumber(self.FIELD_LENGTH,
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self.tr('Field length'), QgsProcessingParameterNumber.Integer,
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10, False, 1, 255))
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self.addParameter(QgsProcessingParameterNumber(self.FIELD_PRECISION,
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self.tr('Field precision'), QgsProcessingParameterNumber.Integer, 0, False, 0, 10))
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def name(self):
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return 'addfieldtoattributestable'
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def displayName(self):
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return self.tr('Add field to attributes table')
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def outputName(self):
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return self.tr('Added')
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def inputLayerTypes(self):
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return [QgsProcessing.TypeVector]
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def prepareAlgorithm(self, parameters, context, feedback):
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field_type = self.parameterAsEnum(parameters, self.FIELD_TYPE, context)
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field_name = self.parameterAsString(parameters, self.FIELD_NAME, context)
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field_length = self.parameterAsInt(parameters, self.FIELD_LENGTH, context)
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field_precision = self.parameterAsInt(parameters, self.FIELD_PRECISION, context)
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self.field = QgsField(field_name, self.TYPES[field_type], '',
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field_length, field_precision)
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return True
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def outputFields(self, inputFields):
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inputFields.append(self.field)
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return inputFields
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def sourceFlags(self):
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return QgsProcessingFeatureSource.FlagSkipGeometryValidityChecks
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def processFeature(self, feature, context, feedback):
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attributes = feature.attributes()
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attributes.append(None)
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feature.setAttributes(attributes)
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return [feature]
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