Port set raster style alg to new API

python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py

@@ -128,6 +128,7 @@
 from .ServiceAreaFromLayer import ServiceAreaFromLayer
 from .ServiceAreaFromPoint import ServiceAreaFromPoint
 from .SetMValue import SetMValue
+from .SetRasterStyle import SetRasterStyle
 from .SetVectorStyle import SetVectorStyle
 from .SetZValue import SetZValue
 from .ShortestPathLayerToPoint import ShortestPathLayerToPoint
@@ -162,7 +163,6 @@
 # from .GeometryConvert import GeometryConvert
 # from .FieldsCalculator import FieldsCalculator
 # from .FieldPyculator import FieldsPyculator
-# from .SetRasterStyle import SetRasterStyle
 # from .SelectByAttributeSum import SelectByAttributeSum
 # from .Datasources2Vrt import Datasources2Vrt
 # from .DefineProjection import DefineProjection
@@ -192,7 +192,6 @@ def getAlgs(self):
         #         SpatialJoin(),
         #         GeometryConvert(), FieldsCalculator(),
         #         FieldsPyculator(),
-        #         SetRasterStyle(),
         #         FieldsMapper(), SelectByAttributeSum(), Datasources2Vrt(),
         #         DefineProjection(),
         #         RectanglesOvalsDiamondsVariable(),
@@ -289,6 +288,7 @@ def getAlgs(self):
                 ServiceAreaFromLayer(),
                 ServiceAreaFromPoint(),
                 SetMValue(),
+                SetRasterStyle(),
                 SetVectorStyle(),
                 SetZValue(),
                 ShortestPathLayerToPoint(),

python/plugins/processing/algs/qgis/SetRasterStyle.py

@@ -29,13 +29,10 @@
 
 from qgis.PyQt.QtXml import QDomDocument
 
-from qgis.core import (QgsApplication,
-                       QgsProcessingUtils)
+from qgis.core import (QgsProcessingParameterRasterLayer,
+                       QgsProcessingParameterFile,
+                       QgsProcessingOutputRasterLayer)
 from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
-from processing.core.parameters import ParameterFile
-from processing.core.parameters import ParameterRaster
-from processing.core.outputs import OutputRaster
-from processing.tools import dataobjects
 
 
 class SetRasterStyle(QgisAlgorithm):
@@ -51,11 +48,11 @@ def __init__(self):
         super().__init__()
 
     def initAlgorithm(self, config=None):
-        self.addParameter(ParameterRaster(self.INPUT,
-                                          self.tr('Raster layer')))
-        self.addParameter(ParameterFile(self.STYLE,
-                                        self.tr('Style file'), False, False, 'qml'))
-        self.addOutput(OutputRaster(self.OUTPUT, self.tr('Styled'), True))
+        self.addParameter(QgsProcessingParameterRasterLayer(self.INPUT,
+                                                            self.tr('Raster layer')))
+        self.addParameter(QgsProcessingParameterFile(self.STYLE,
+                                                     self.tr('Style file'), extension='qml'))
+        self.addOutput(QgsProcessingOutputRasterLayer(self.INPUT, self.tr('Styled')))
 
     def name(self):
         return 'setstyleforrasterlayer'
@@ -64,19 +61,12 @@ def displayName(self):
         return self.tr('Set style for raster layer')
 
     def processAlgorithm(self, parameters, context, feedback):
-        filename = self.getParameterValue(self.INPUT)
-        layer = QgsProcessingUtils.mapLayerFromString(filename, context)
-
-        style = self.getParameterValue(self.STYLE)
-        if layer is None:
-            dataobjects.load(filename, os.path.basename(filename), style=style)
-        else:
-            with open(style) as f:
-                xml = "".join(f.readlines())
-            d = QDomDocument()
-            d.setContent(xml)
-            n = d.firstChild()
-            layer.readSymbology(n, '')
-            context.addLayerToLoadOnCompletion(self.getOutputFromName(self.OUTPUT).value)
-            self.setOutputValue(self.OUTPUT, filename)
-            layer.triggerRepaint()
+        layer = self.parameterAsRasterLayer(parameters, self.INPUT, context)
+        style = self.parameterAsFile(parameters, self.STYLE, context)
+        with open(style) as f:
+            xml = "".join(f.readlines())
+        d = QDomDocument()
+        d.setContent(xml)
+        layer.importNamedStyle(d)
+        layer.triggerRepaint()
+        return {self.INPUT: layer}