-
-
Notifications
You must be signed in to change notification settings - Fork 3k
/
dataobjects.py
321 lines (274 loc) · 12.2 KB
/
dataobjects.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
# -*- coding: utf-8 -*-
"""
***************************************************************************
dataobject.py
---------------------
Date : August 2012
Copyright : (C) 2012 by Victor Olaya
Email : volayaf 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. *
* *
***************************************************************************
"""
from builtins import str
__author__ = 'Victor Olaya'
__date__ = 'August 2012'
__copyright__ = '(C) 2012, Victor Olaya'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
import os
import re
from qgis.core import (QgsVectorFileWriter,
QgsMapLayer,
QgsRasterLayer,
QgsWkbTypes,
QgsVectorLayer,
QgsProject,
QgsCoordinateReferenceSystem,
QgsSettings,
QgsProcessingUtils,
QgsProcessingContext,
QgsFeatureRequest)
from qgis.gui import QgsSublayersDialog
from qgis.PyQt.QtCore import QCoreApplication
from processing.core.ProcessingConfig import ProcessingConfig
from processing.algs.gdal.GdalUtils import GdalUtils
from processing.tools.system import (getTempFilenameInTempFolder,
getTempFilename,
removeInvalidChars,
isWindows)
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
ALL_TYPES = [-1]
TYPE_VECTOR_ANY = -1
TYPE_VECTOR_POINT = 0
TYPE_VECTOR_LINE = 1
TYPE_VECTOR_POLYGON = 2
TYPE_RASTER = 3
TYPE_FILE = 4
TYPE_TABLE = 5
def createContext():
"""
Creates a default processing context
"""
context = QgsProcessingContext()
context.setProject(QgsProject.instance())
use_selection = ProcessingConfig.getSetting(ProcessingConfig.USE_SELECTED)
if use_selection:
context.setFlags(QgsProcessingContext.UseSelectionIfPresent)
invalid_features_method = ProcessingConfig.getSetting(ProcessingConfig.FILTER_INVALID_GEOMETRIES)
if not invalid_features_method:
invalid_features_method = QgsFeatureRequest.GeometryAbortOnInvalid
context.setInvalidGeometryCheck(invalid_features_method)
def raise_error(f):
raise GeoAlgorithmExecutionException(QCoreApplication.translate("FeatureIterator",
'Features with invalid geometries found. Please fix these geometries or specify the "Ignore invalid input features" flag'))
context.setInvalidGeometryCallback(raise_error)
return context
def getSupportedOutputRasterLayerExtensions():
allexts = []
for exts in list(GdalUtils.getSupportedRasters().values()):
for ext in exts:
if ext != 'tif' and ext not in allexts:
allexts.append(ext)
allexts.sort()
allexts.insert(0, 'tif') # tif is the default, should be the first
return allexts
def load(fileName, name=None, crs=None, style=None):
"""Loads a layer/table into the current project, given its file.
"""
if fileName is None:
return
prjSetting = None
settings = QgsSettings()
if crs is not None:
prjSetting = settings.value('/Projections/defaultBehavior')
settings.setValue('/Projections/defaultBehavior', '')
if name is None:
name = os.path.split(fileName)[1]
qgslayer = QgsVectorLayer(fileName, name, 'ogr')
if qgslayer.isValid():
if crs is not None and qgslayer.crs() is None:
qgslayer.setCrs(crs, False)
if style is None:
if qgslayer.geometryType() == QgsWkbTypes.PointGeometry:
style = ProcessingConfig.getSetting(ProcessingConfig.VECTOR_POINT_STYLE)
elif qgslayer.geometryType() == QgsWkbTypes.LineGeometry:
style = ProcessingConfig.getSetting(ProcessingConfig.VECTOR_LINE_STYLE)
else:
style = ProcessingConfig.getSetting(ProcessingConfig.VECTOR_POLYGON_STYLE)
qgslayer.loadNamedStyle(style)
QgsProject.instance().addMapLayers([qgslayer])
else:
qgslayer = QgsRasterLayer(fileName, name)
if qgslayer.isValid():
if crs is not None and qgslayer.crs() is None:
qgslayer.setCrs(crs, False)
if style is None:
style = ProcessingConfig.getSetting(ProcessingConfig.RASTER_STYLE)
qgslayer.loadNamedStyle(style)
QgsProject.instance().addMapLayers([qgslayer])
else:
if prjSetting:
settings.setValue('/Projections/defaultBehavior', prjSetting)
raise RuntimeError('Could not load layer: ' + str(fileName) +
'\nCheck the processing framework log to look for errors')
if prjSetting:
settings.setValue('/Projections/defaultBehavior', prjSetting)
return qgslayer
def exportVectorLayer(layer, supported=None):
"""Takes a QgsVectorLayer and returns the filename to refer to it,
which allows external apps which support only file-based layers to
use it. It performs the necessary export in case the input layer
is not in a standard format suitable for most applications, it is
a remote one or db-based (non-file based) one, or if there is a
selection and it should be used, exporting just the selected
features.
Currently, the output is restricted to shapefiles, so anything
that is not in a shapefile will get exported. It also export to
a new file if the original one contains non-ascii characters.
"""
supported = supported or ["shp"]
settings = QgsSettings()
systemEncoding = settings.value('/UI/encoding', 'System')
output = getTempFilename('shp')
basename = removeInvalidChars(os.path.basename(layer.source()))
if basename:
if not basename.endswith("shp"):
basename = os.path.splitext(basename)[0] + ".shp"
output = getTempFilenameInTempFolder(basename)
else:
output = getTempFilename("shp")
useSelection = ProcessingConfig.getSetting(ProcessingConfig.USE_SELECTED)
if useSelection and layer.selectedFeatureCount() != 0:
writer = QgsVectorFileWriter(output, systemEncoding,
layer.fields(),
layer.wkbType(), layer.crs())
selection = layer.selectedFeatures()
for feat in selection:
writer.addFeature(feat)
del writer
return output
else:
if not os.path.splitext(layer.source())[1].lower() in supported:
writer = QgsVectorFileWriter(
output, systemEncoding,
layer.fields(), layer.wkbType(),
layer.crs()
)
for feat in layer.getFeatures():
writer.addFeature(feat)
del writer
return output
else:
return layer.source()
def exportRasterLayer(layer):
"""Takes a QgsRasterLayer and returns the filename to refer to it,
which allows external apps which support only file-based layers to
use it. It performs the necessary export in case the input layer
is not in a standard format suitable for most applications, it is
a remote one or db-based (non-file based) one.
Currently, the output is restricted to geotiff, but not all other
formats are exported. Only those formats not supported by GDAL are
exported, so it is assumed that the external app uses GDAL to read
the layer.
"""
# TODO: Do the conversion here
return str(layer.source())
def exportTable(table):
"""Takes a QgsVectorLayer and returns the filename to refer to its
attributes table, which allows external apps which support only
file-based layers to use it.
It performs the necessary export in case the input layer is not in
a standard format suitable for most applications, it isa remote
one or db-based (non-file based) one.
Currently, the output is restricted to DBF. It also export to a new
file if the original one contains non-ascii characters.
"""
settings = QgsSettings()
systemEncoding = settings.value('/UI/encoding', 'System')
output = getTempFilename()
isASCII = True
try:
str(table.source()).decode('ascii')
except UnicodeEncodeError:
isASCII = False
isDbf = str(table.source()).endswith('dbf') \
or str(table.source()).endswith('shp')
if not isDbf or not isASCII:
writer = QgsVectorFileWriter(output, systemEncoding,
table.fields(), QgsWkbTypes.NullGeometry,
QgsCoordinateReferenceSystem('4326'))
for feat in table.getFeatures():
writer.addFeature(feat)
del writer
return output + '.dbf'
else:
filename = str(table.source())
if str(table.source()).endswith('shp'):
return filename[:-3] + 'dbf'
else:
return filename
def getRasterSublayer(path, param):
layer = QgsRasterLayer(path)
try:
# If the layer is a raster layer and has multiple sublayers, let the user chose one.
# Based on QgisApp::askUserForGDALSublayers
if layer and param.showSublayersDialog and layer.dataProvider().name() == "gdal" and len(layer.subLayers()) > 1:
layers = []
subLayerNum = 0
# simplify raster sublayer name
for subLayer in layer.subLayers():
# if netcdf/hdf use all text after filename
if bool(re.match('netcdf', subLayer, re.I)) or bool(re.match('hdf', subLayer, re.I)):
subLayer = subLayer.split(path)[1]
subLayer = subLayer[1:]
else:
# remove driver name and file name
subLayer.replace(subLayer.split(":")[0], "")
subLayer.replace(path, "")
# remove any : or " left over
if subLayer.startswith(":"):
subLayer = subLayer[1:]
if subLayer.startswith("\""):
subLayer = subLayer[1:]
if subLayer.endswith(":"):
subLayer = subLayer[:-1]
if subLayer.endswith("\""):
subLayer = subLayer[:-1]
ld = QgsSublayersDialog.LayerDefinition()
ld.layerId = subLayerNum
ld.layerName = subLayer
layers.append(ld)
subLayerNum = subLayerNum + 1
# Use QgsSublayersDialog
# Would be good if QgsSublayersDialog had an option to allow only one sublayer to be selected
chooseSublayersDialog = QgsSublayersDialog(QgsSublayersDialog.Gdal, "gdal")
chooseSublayersDialog.populateLayerTable(layers)
if chooseSublayersDialog.exec_():
return layer.subLayers()[chooseSublayersDialog.selectionIndexes()[0]]
else:
# If user pressed cancel then just return the input path
return path
else:
# If the sublayers selection dialog is not to be shown then just return the input path
return path
except:
# If the layer is not a raster layer, then just return the input path
return path
def vectorDataType(obj):
types = ''
for t in obj.datatype:
if t == dataobjects.TYPE_VECTOR_POINT:
types += 'point, '
elif t == dataobjects.TYPE_VECTOR_LINE:
types += 'line, '
elif t == dataobjects.TYPE_VECTOR_POLYGON:
types += 'polygon, '
else:
types += 'any, '
return types[:-2]