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"""
***************************************************************************
Processing.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. *
* *
***************************************************************************
"""
__author__ = "Victor Olaya"
__date__ = "August 2012"
__copyright__ = "(C) 2012, Victor Olaya"
import os
import traceback
from qgis.PyQt.QtCore import Qt, QCoreApplication
from qgis.PyQt.QtWidgets import QApplication
from qgis.PyQt.QtGui import QCursor
from qgis.utils import iface
from qgis.core import (
QgsMessageLog,
QgsApplication,
QgsMapLayer,
QgsProcessingProvider,
QgsProcessingAlgorithm,
QgsProcessingException,
QgsProcessingParameterDefinition,
QgsProcessingOutputVectorLayer,
QgsProcessingOutputRasterLayer,
QgsProcessingOutputPointCloudLayer,
QgsProcessingOutputMapLayer,
QgsProcessingOutputMultipleLayers,
QgsProcessingFeedback,
QgsRuntimeProfiler,
)
from qgis.analysis import QgsNativeAlgorithms
import processing
from processing.core.ProcessingConfig import ProcessingConfig
from processing.gui.MessageBarProgress import MessageBarProgress
from processing.gui.RenderingStyles import RenderingStyles
from processing.gui.AlgorithmExecutor import execute
from processing.script import ScriptUtils
from processing.tools import dataobjects
with QgsRuntimeProfiler.profile("Import QGIS Provider"):
from processing.algs.qgis.QgisAlgorithmProvider import QgisAlgorithmProvider # NOQA
with QgsRuntimeProfiler.profile("Import GDAL Provider"):
from processing.algs.gdal.GdalAlgorithmProvider import GdalAlgorithmProvider # NOQA
with QgsRuntimeProfiler.profile("Import Script Provider"):
from processing.script.ScriptAlgorithmProvider import (
ScriptAlgorithmProvider,
) # NOQA
# should be loaded last - ensures that all dependent algorithms are available when loading models
from processing.modeler.ModelerAlgorithmProvider import ModelerAlgorithmProvider # NOQA
from processing.modeler.ProjectProvider import ProjectProvider # NOQA
class Processing:
BASIC_PROVIDERS = []
@staticmethod
def activateProvider(providerOrName, activate=True):
provider_id = (
providerOrName.id()
if isinstance(providerOrName, QgsProcessingProvider)
else providerOrName
)
provider = QgsApplication.processingRegistry().providerById(provider_id)
try:
provider.setActive(True)
provider.refreshAlgorithms()
except:
# provider could not be activated
QgsMessageLog.logMessage(
Processing.tr("Error: Provider {0} could not be activated\n").format(
provider_id
),
Processing.tr("Processing"),
)
@staticmethod
def initialize():
if "script" in [
p.id() for p in QgsApplication.processingRegistry().providers()
]:
return
with QgsRuntimeProfiler.profile("Initialize"):
# add native provider if not already added
if "native" not in [
p.id() for p in QgsApplication.processingRegistry().providers()
]:
QgsApplication.processingRegistry().addProvider(
QgsNativeAlgorithms(QgsApplication.processingRegistry())
)
# add 3d provider if available and not already added
if "3d" not in [
p.id() for p in QgsApplication.processingRegistry().providers()
]:
try:
from qgis._3d import Qgs3DAlgorithms
QgsApplication.processingRegistry().addProvider(
Qgs3DAlgorithms(QgsApplication.processingRegistry())
)
except ImportError:
# no 3d library available
pass
# Add the basic providers
basic_providers = [
QgisAlgorithmProvider,
GdalAlgorithmProvider,
ScriptAlgorithmProvider,
]
# model providers are deferred for qgis_process startup
if QgsApplication.platform() != "qgis_process":
basic_providers.extend([ModelerAlgorithmProvider, ProjectProvider])
for c in basic_providers:
p = c()
if QgsApplication.processingRegistry().addProvider(p):
Processing.BASIC_PROVIDERS.append(p)
if QgsApplication.platform() == "external":
# for external applications we must also load the builtin providers stored in separate plugins
try:
from grassprovider.grass_provider import GrassProvider
p = GrassProvider()
if QgsApplication.processingRegistry().addProvider(p):
Processing.BASIC_PROVIDERS.append(p)
except ImportError:
pass
# And initialize
ProcessingConfig.initialize()
ProcessingConfig.readSettings()
RenderingStyles.loadStyles()
@staticmethod
def perform_deferred_model_initialization():
if "model" in [p.id() for p in QgsApplication.processingRegistry().providers()]:
return
# Add the model providers
# note that we don't add the Project Provider, as this cannot be called
# from qgis_process
model_providers = [ModelerAlgorithmProvider]
for c in model_providers:
p = c()
if QgsApplication.processingRegistry().addProvider(p):
Processing.BASIC_PROVIDERS.append(p)
@staticmethod
def deinitialize():
for p in Processing.BASIC_PROVIDERS:
QgsApplication.processingRegistry().removeProvider(p)
Processing.BASIC_PROVIDERS = []
@staticmethod
def runAlgorithm(algOrName, parameters, onFinish=None, feedback=None, context=None):
if isinstance(algOrName, QgsProcessingAlgorithm):
alg = algOrName
else:
alg = QgsApplication.processingRegistry().createAlgorithmById(algOrName)
if feedback is None:
feedback = QgsProcessingFeedback()
if alg is None:
msg = Processing.tr("Error: Algorithm {0} not found\n").format(algOrName)
feedback.reportError(msg)
raise QgsProcessingException(msg)
if context is None:
context = dataobjects.createContext(feedback)
if context.feedback() is None:
context.setFeedback(feedback)
ok, msg = alg.checkParameterValues(parameters, context)
if not ok:
msg = Processing.tr("Unable to execute algorithm\n{0}").format(msg)
feedback.reportError(msg)
raise QgsProcessingException(msg)
if not alg.validateInputCrs(parameters, context):
feedback.pushInfo(
Processing.tr(
"Warning: Not all input layers use the same CRS.\nThis can cause unexpected results."
)
)
ret, results = execute(
alg, parameters, context, feedback, catch_exceptions=False
)
if ret:
feedback.pushInfo(Processing.tr("Results: {}").format(results))
if onFinish is not None:
onFinish(alg, context, feedback)
else:
# auto convert layer references in results to map layers
for out in alg.outputDefinitions():
if out.name() not in results:
continue
if isinstance(
out,
(
QgsProcessingOutputVectorLayer,
QgsProcessingOutputRasterLayer,
QgsProcessingOutputPointCloudLayer,
QgsProcessingOutputMapLayer,
),
):
result = results[out.name()]
if not isinstance(result, QgsMapLayer):
layer = context.takeResultLayer(
result
) # transfer layer ownership out of context
if layer:
results[out.name()] = (
layer # replace layer string ref with actual layer (+ownership)
)
elif isinstance(out, QgsProcessingOutputMultipleLayers):
result = results[out.name()]
if result:
layers_result = []
for l in result:
if not isinstance(l, QgsMapLayer):
layer = context.takeResultLayer(
l
) # transfer layer ownership out of context
if layer:
layers_result.append(layer)
else:
layers_result.append(l)
else:
layers_result.append(l)
results[out.name()] = (
layers_result # replace layers strings ref with actual layers (+ownership)
)
else:
msg = Processing.tr("There were errors executing the algorithm.")
feedback.reportError(msg)
raise QgsProcessingException(msg)
if isinstance(feedback, MessageBarProgress):
feedback.close()
return results
@staticmethod
def tr(string, context=""):
if context == "":
context = "Processing"
return QCoreApplication.translate(context, string)
|
