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18efe655e9
Ensures that processing tools which use vector layers with open options work correctly, respecting the layer's open option settings
164 lines
7.6 KiB
Python
164 lines
7.6 KiB
Python
"""
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***************************************************************************
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OneSideBuffer.py
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---------------------
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Date : Janaury 2015
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Copyright : (C) 2015 by Giovanni Manghi
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Email : giovanni dot manghi at naturalgis dot pt
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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__ = 'Giovanni Manghi'
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__date__ = 'January 2015'
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__copyright__ = '(C) 2015, Giovanni Manghi'
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from qgis.core import (QgsProcessing,
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QgsProcessingException,
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QgsProcessingParameterDefinition,
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QgsProcessingParameterDistance,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterEnum,
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QgsProcessingParameterField,
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QgsProcessingParameterString,
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QgsProcessingParameterNumber,
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QgsProcessingParameterBoolean,
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QgsProcessingParameterVectorDestination)
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from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
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from processing.algs.gdal.GdalUtils import GdalUtils
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class OneSideBuffer(GdalAlgorithm):
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INPUT = 'INPUT'
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FIELD = 'FIELD'
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BUFFER_SIDE = 'BUFFER_SIDE'
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GEOMETRY = 'GEOMETRY'
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DISTANCE = 'DISTANCE'
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DISSOLVE = 'DISSOLVE'
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EXPLODE_COLLECTIONS = 'EXPLODE_COLLECTIONS'
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OPTIONS = 'OPTIONS'
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OUTPUT = 'OUTPUT'
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def __init__(self):
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super().__init__()
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def initAlgorithm(self, config=None):
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self.bufferSides = [self.tr('Right'), self.tr('Left')]
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Input layer'),
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[QgsProcessing.SourceType.TypeVectorLine]))
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self.addParameter(QgsProcessingParameterString(self.GEOMETRY,
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self.tr('Geometry column name'),
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defaultValue='geometry'))
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self.addParameter(QgsProcessingParameterDistance(self.DISTANCE,
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self.tr('Buffer distance'),
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defaultValue=10,
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parentParameterName=self.INPUT))
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self.addParameter(QgsProcessingParameterEnum(self.BUFFER_SIDE,
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self.tr('Buffer side'),
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options=self.bufferSides,
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allowMultiple=False,
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defaultValue=0))
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self.addParameter(QgsProcessingParameterField(self.FIELD,
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self.tr('Dissolve by attribute'),
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None,
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self.INPUT,
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QgsProcessingParameterField.DataType.Any,
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optional=True))
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self.addParameter(QgsProcessingParameterBoolean(self.DISSOLVE,
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self.tr('Dissolve all results'),
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defaultValue=False))
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self.addParameter(QgsProcessingParameterBoolean(self.EXPLODE_COLLECTIONS,
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self.tr('Produce one feature for each geometry in any kind of geometry collection in the source file'),
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defaultValue=False))
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options_param = QgsProcessingParameterString(self.OPTIONS,
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self.tr('Additional creation options'),
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defaultValue='',
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optional=True)
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options_param.setFlags(options_param.flags() | QgsProcessingParameterDefinition.Flag.FlagAdvanced)
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self.addParameter(options_param)
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self.addParameter(QgsProcessingParameterVectorDestination(self.OUTPUT,
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self.tr('One-sided buffer'),
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QgsProcessing.SourceType.TypeVectorPolygon))
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def name(self):
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return 'onesidebuffer'
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def displayName(self):
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return self.tr('One side buffer')
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def group(self):
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return self.tr('Vector geoprocessing')
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def groupId(self):
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return 'vectorgeoprocessing'
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def commandName(self):
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return 'ogr2ogr'
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def getConsoleCommands(self, parameters, context, feedback, executing=True):
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source = self.parameterAsSource(parameters, self.INPUT, context)
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if source is None:
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raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
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fields = source.fields()
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input_details = self.getOgrCompatibleSource(self.INPUT, parameters, context, feedback, executing)
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geometry = self.parameterAsString(parameters, self.GEOMETRY, context)
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distance = self.parameterAsDouble(parameters, self.DISTANCE, context)
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side = self.parameterAsEnum(parameters, self.BUFFER_SIDE, context)
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fieldName = self.parameterAsString(parameters, self.FIELD, context)
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dissolve = self.parameterAsBoolean(parameters, self.DISSOLVE, context)
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options = self.parameterAsString(parameters, self.OPTIONS, context)
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outFile = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
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self.setOutputValue(self.OUTPUT, outFile)
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output_details = GdalUtils.gdal_connection_details_from_uri(outFile, context)
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other_fields_exist = any(
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True for f in fields
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if f.name() != geometry
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)
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other_fields = ',*' if other_fields_exist else ''
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arguments = [
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output_details.connection_string,
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input_details.connection_string,
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'-dialect',
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'sqlite',
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'-sql'
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]
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if dissolve or fieldName:
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sql = f'SELECT ST_Union(ST_SingleSidedBuffer({geometry}, {distance}, {side})) AS {geometry}{other_fields} FROM "{input_details.layer_name}"'
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else:
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sql = f'SELECT ST_SingleSidedBuffer({geometry}, {distance}, {side}) AS {geometry}{other_fields} FROM "{input_details.layer_name}"'
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if fieldName:
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sql = f'{sql} GROUP BY "{fieldName}"'
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arguments.append(sql)
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if self.parameterAsBoolean(parameters, self.EXPLODE_COLLECTIONS, context):
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arguments.append('-explodecollections')
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if input_details.open_options:
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arguments.extend(input_details.open_options_as_arguments())
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if options:
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arguments.append(options)
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if output_details.format:
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arguments.append(f'-f {output_details.format}')
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return ['ogr2ogr', GdalUtils.escapeAndJoin(arguments)]
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