diff --git a/python/core/processing/qgsprocessingoutputs.sip b/python/core/processing/qgsprocessingoutputs.sip
index 5281c90b39ff..c9779d97e0ed 100644
--- a/python/core/processing/qgsprocessingoutputs.sip
+++ b/python/core/processing/qgsprocessingoutputs.sip
@@ -28,17 +28,17 @@ class QgsProcessingOutputDefinition
 %End
 
 %ConvertToSubClassCode
-    if ( sipCpp->type() == "outputVector" )
+    if ( sipCpp->type() == QgsProcessingOutputVectorLayer::typeName() )
       sipType = sipType_QgsProcessingOutputVectorLayer;
-    else if ( sipCpp->type() == "outputRaster" )
+    else if ( sipCpp->type() == QgsProcessingOutputRasterLayer::typeName() )
       sipType = sipType_QgsProcessingOutputRasterLayer;
-    else if ( sipCpp->type() == "outputHtml" )
+    else if ( sipCpp->type() == QgsProcessingOutputHtml::typeName() )
       sipType = sipType_QgsProcessingOutputHtml;
-    else if ( sipCpp->type() == "outputNumber" )
+    else if ( sipCpp->type() == QgsProcessingOutputNumber::typeName() )
       sipType = sipType_QgsProcessingOutputNumber;
-    else if ( sipCpp->type() == "outputString" )
+    else if ( sipCpp->type() == QgsProcessingOutputString::typeName() )
       sipType = sipType_QgsProcessingOutputString;
-    else if ( sipCpp->type() == "outputFolder" )
+    else if ( sipCpp->type() == QgsProcessingOutputFolder::typeName() )
       sipType = sipType_QgsProcessingOutputFolder;
 %End
   public:
@@ -111,6 +111,11 @@ class QgsProcessingOutputVectorLayer : QgsProcessingOutputDefinition
  Constructor for QgsProcessingOutputVectorLayer.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the output class.
+ :rtype: str
+%End
     virtual QString type() const;
 
     QgsProcessingParameterDefinition::LayerType dataType() const;
@@ -145,7 +150,14 @@ class QgsProcessingOutputRasterLayer : QgsProcessingOutputDefinition
  Constructor for QgsProcessingOutputRasterLayer.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the output class.
+ :rtype: str
+%End
     virtual QString type() const;
+
+
 };
 
 class QgsProcessingOutputHtml : QgsProcessingOutputDefinition
@@ -165,7 +177,13 @@ class QgsProcessingOutputHtml : QgsProcessingOutputDefinition
  Constructor for QgsProcessingOutputHtml.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the output class.
+ :rtype: str
+%End
     virtual QString type() const;
+
 };
 
 class QgsProcessingOutputNumber : QgsProcessingOutputDefinition
@@ -185,6 +203,11 @@ class QgsProcessingOutputNumber : QgsProcessingOutputDefinition
  Constructor for QgsProcessingOutputNumber.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the output class.
+ :rtype: str
+%End
     virtual QString type() const;
 };
 
@@ -205,7 +228,13 @@ class QgsProcessingOutputString : QgsProcessingOutputDefinition
  Constructor for QgsProcessingOutputString.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the output class.
+ :rtype: str
+%End
     virtual QString type() const;
+
 };
 
 class QgsProcessingOutputFolder : QgsProcessingOutputDefinition
@@ -220,12 +249,19 @@ class QgsProcessingOutputFolder : QgsProcessingOutputDefinition
 %End
   public:
 
+
     QgsProcessingOutputFolder( const QString &name, const QString &description = QString() );
 %Docstring
  Constructor for QgsProcessingOutputFolder.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the output class.
+ :rtype: str
+%End
     virtual QString type() const;
+
 };
 
 
diff --git a/python/core/processing/qgsprocessingparameters.sip b/python/core/processing/qgsprocessingparameters.sip
index 35eca5ce7ef2..42f408ad01e1 100644
--- a/python/core/processing/qgsprocessingparameters.sip
+++ b/python/core/processing/qgsprocessingparameters.sip
@@ -145,49 +145,49 @@ class QgsProcessingParameterDefinition
 %End
 
 %ConvertToSubClassCode
-    if ( sipCpp->type() == "boolean" )
+    if ( sipCpp->type() == QgsProcessingParameterBoolean::typeName() )
       sipType = sipType_QgsProcessingParameterBoolean;
-    else if ( sipCpp->type() == "crs" )
+    else if ( sipCpp->type() == QgsProcessingParameterCrs::typeName() )
       sipType = sipType_QgsProcessingParameterCrs;
-    else if ( sipCpp->type() == "layer" )
+    else if ( sipCpp->type() == QgsProcessingParameterMapLayer::typeName() )
       sipType = sipType_QgsProcessingParameterMapLayer;
-    else if ( sipCpp->type() == "extent" )
+    else if ( sipCpp->type() == QgsProcessingParameterExtent::typeName() )
       sipType = sipType_QgsProcessingParameterExtent;
-    else if ( sipCpp->type() == "point" )
+    else if ( sipCpp->type() == QgsProcessingParameterPoint::typeName() )
       sipType = sipType_QgsProcessingParameterPoint;
-    else if ( sipCpp->type() == "file" )
+    else if ( sipCpp->type() == QgsProcessingParameterFile::typeName() )
       sipType = sipType_QgsProcessingParameterFile;
-    else if ( sipCpp->type() == "matrix" )
+    else if ( sipCpp->type() == QgsProcessingParameterMatrix::typeName() )
       sipType = sipType_QgsProcessingParameterMatrix;
-    else if ( sipCpp->type() == "multilayer" )
+    else if ( sipCpp->type() == QgsProcessingParameterMultipleLayers::typeName() )
       sipType = sipType_QgsProcessingParameterMultipleLayers;
-    else if ( sipCpp->type() == "number" )
+    else if ( sipCpp->type() == QgsProcessingParameterNumber::typeName() )
       sipType = sipType_QgsProcessingParameterNumber;
-    else if ( sipCpp->type() == "range" )
+    else if ( sipCpp->type() == QgsProcessingParameterRange::typeName() )
       sipType = sipType_QgsProcessingParameterRange;
-    else if ( sipCpp->type() == "raster" )
+    else if ( sipCpp->type() == QgsProcessingParameterRasterLayer::typeName() )
       sipType = sipType_QgsProcessingParameterRasterLayer;
-    else if ( sipCpp->type() == "enum" )
+    else if ( sipCpp->type() == QgsProcessingParameterEnum::typeName() )
       sipType = sipType_QgsProcessingParameterEnum;
-    else if ( sipCpp->type() == "string" )
+    else if ( sipCpp->type() == QgsProcessingParameterString::typeName() )
       sipType = sipType_QgsProcessingParameterString;
-    else if ( sipCpp->type() == "expression" )
+    else if ( sipCpp->type() == QgsProcessingParameterExpression::typeName() )
       sipType = sipType_QgsProcessingParameterExpression;
-    else if ( sipCpp->type() == "vector" )
+    else if ( sipCpp->type() == QgsProcessingParameterVectorLayer::typeName() )
       sipType = sipType_QgsProcessingParameterVectorLayer;
-    else if ( sipCpp->type() == "field" )
+    else if ( sipCpp->type() == QgsProcessingParameterField::typeName() )
       sipType = sipType_QgsProcessingParameterField;
-    else if ( sipCpp->type() == "source" )
+    else if ( sipCpp->type() == QgsProcessingParameterFeatureSource::typeName() )
       sipType = sipType_QgsProcessingParameterFeatureSource;
-    else if ( sipCpp->type() == "sink" )
+    else if ( sipCpp->type() == QgsProcessingParameterFeatureSink::typeName() )
       sipType = sipType_QgsProcessingParameterFeatureSink;
-    else if ( sipCpp->type() == "vectorOut" )
+    else if ( sipCpp->type() == QgsProcessingParameterVectorOutput::typeName() )
       sipType = sipType_QgsProcessingParameterVectorOutput;
-    else if ( sipCpp->type() == "rasterOut" )
+    else if ( sipCpp->type() == QgsProcessingParameterRasterOutput::typeName() )
       sipType = sipType_QgsProcessingParameterRasterOutput;
-    else if ( sipCpp->type() == "fileOut" )
+    else if ( sipCpp->type() == QgsProcessingParameterFileOutput::typeName() )
       sipType = sipType_QgsProcessingParameterFileOutput;
-    else if ( sipCpp->type() == "folderOut" )
+    else if ( sipCpp->type() == QgsProcessingParameterFolderOutput::typeName() )
       sipType = sipType_QgsProcessingParameterFolderOutput;
 %End
   public:
@@ -607,6 +607,11 @@ class QgsProcessingParameterBoolean : QgsProcessingParameterDefinition
  Constructor for QgsProcessingParameterBoolean.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const;
 
@@ -638,6 +643,11 @@ class QgsProcessingParameterCrs : QgsProcessingParameterDefinition
  Constructor for QgsProcessingParameterCrs.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -670,6 +680,11 @@ class QgsProcessingParameterMapLayer : QgsProcessingParameterDefinition
  Constructor for QgsProcessingParameterMapLayer.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -702,6 +717,11 @@ class QgsProcessingParameterExtent : QgsProcessingParameterDefinition
  Constructor for QgsProcessingParameterExtent.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -735,6 +755,11 @@ class QgsProcessingParameterPoint : QgsProcessingParameterDefinition
  Constructor for QgsProcessingParameterPoint.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -771,6 +796,11 @@ class QgsProcessingParameterFile : QgsProcessingParameterDefinition
  Constructor for QgsProcessingParameterFile.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -836,6 +866,11 @@ class QgsProcessingParameterMatrix : QgsProcessingParameterDefinition
  Constructor for QgsProcessingParameterMatrix.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -919,6 +954,11 @@ class QgsProcessingParameterMultipleLayers : QgsProcessingParameterDefinition
  Constructor for QgsProcessingParameterMultipleLayers.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -997,6 +1037,11 @@ class QgsProcessingParameterNumber : QgsProcessingParameterDefinition
  Constructor for QgsProcessingParameterNumber.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -1075,6 +1120,11 @@ class QgsProcessingParameterRange : QgsProcessingParameterDefinition
  Constructor for QgsProcessingParameterRange.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -1125,6 +1175,11 @@ class QgsProcessingParameterRasterLayer : QgsProcessingParameterDefinition
  Constructor for QgsProcessingParameterRasterLayer.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -1159,6 +1214,11 @@ class QgsProcessingParameterEnum : QgsProcessingParameterDefinition
  Constructor for QgsProcessingParameterEnum.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -1225,6 +1285,11 @@ class QgsProcessingParameterString : QgsProcessingParameterDefinition
  Constructor for QgsProcessingParameterString.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const;
 
@@ -1276,6 +1341,11 @@ class QgsProcessingParameterExpression : QgsProcessingParameterDefinition
  Constructor for QgsProcessingParameterExpression.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const;
 
@@ -1327,6 +1397,11 @@ class QgsProcessingParameterVectorLayer : QgsProcessingParameterDefinition
  Constructor for QgsProcessingParameterVectorLayer.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -1370,6 +1445,11 @@ class QgsProcessingParameterField : QgsProcessingParameterDefinition
  Constructor for QgsProcessingParameterField.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -1451,6 +1531,11 @@ class QgsProcessingParameterFeatureSource : QgsProcessingParameterDefinition
  Constructor for QgsProcessingParameterFeatureSource.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -1570,6 +1655,11 @@ class QgsProcessingParameterFeatureSink : QgsProcessingDestinationParameter
  Constructor for QgsProcessingParameterFeatureSink.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -1637,6 +1727,11 @@ class QgsProcessingParameterVectorOutput : QgsProcessingDestinationParameter
  Constructor for QgsProcessingParameterVectorOutput.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -1702,6 +1797,11 @@ class QgsProcessingParameterRasterOutput : QgsProcessingDestinationParameter
  Constructor for QgsProcessingParameterRasterOutput.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -1739,6 +1839,11 @@ class QgsProcessingParameterFileOutput : QgsProcessingDestinationParameter
  Constructor for QgsProcessingParameterFileOutput.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
@@ -1795,6 +1900,11 @@ class QgsProcessingParameterFolderOutput : QgsProcessingDestinationParameter
  Constructor for QgsProcessingParameterFolderOutput.
 %End
 
+    static QString typeName();
+%Docstring
+ Returns the type name for the parameter class.
+ :rtype: str
+%End
     virtual QString type() const;
     virtual bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = 0 ) const;
 
diff --git a/python/plugins/processing/gui/wrappers.py b/python/plugins/processing/gui/wrappers.py
index 74edd6562bb9..01122545992f 100644
--- a/python/plugins/processing/gui/wrappers.py
+++ b/python/plugins/processing/gui/wrappers.py
@@ -909,7 +909,7 @@ def createWidget(self):
         else:
             # strings, numbers, files and table fields are all allowed input types
             strings = self.dialog.getAvailableValuesOfType([QgsProcessingParameterString, QgsProcessingParameterNumber, QgsProcessingParameterFile,
-                                                            QgsProcessingParameterField, QgsProcessingParameterExpression], QgsProcessingOutputString)
+                                                            QgsProcessingParameterField, QgsProcessingParameterExpression], [QgsProcessingOutputString])
             options = [(self.dialog.resolveValueDescription(s), s) for s in strings]
             if self.param.multiLine():
                 widget = MultilineTextPanel(options)
diff --git a/python/plugins/processing/modeler/ModelerParametersDialog.py b/python/plugins/processing/modeler/ModelerParametersDialog.py
index 1e6e86bdcc6b..13cbb4f2afb4 100644
--- a/python/plugins/processing/modeler/ModelerParametersDialog.py
+++ b/python/plugins/processing/modeler/ModelerParametersDialog.py
@@ -40,7 +40,8 @@
                        QgsProcessingParameterFeatureSink,
                        QgsProcessingParameterRasterOutput,
                        QgsProcessingParameterFileOutput,
-                       QgsProcessingParameterFolderOutput)
+                       QgsProcessingParameterFolderOutput,
+                       QgsProcessingOutputDefinition)
 
 from qgis.gui import (QgsMessageBar,
                       QgsScrollArea)
@@ -65,7 +66,7 @@ def __init__(self, alg, model, algName=None):
         # The model this algorithm is going to be added to
         self.model = model
         # The name of the algorithm in the model, in case we are editing it and not defining it for the first time
-        self._algName = algName
+        self.childId = algName
         self.setupUi()
         self.params = None
 
@@ -191,11 +192,11 @@ def setupUi(self):
             wrapper.postInitialize(list(self.wrappers.values()))
 
     def getAvailableDependencies(self):  # spellok
-        if self._algName is None:
+        if self.childId is None:
             dependent = []
         else:
-            dependent = list(self.model.dependentChildAlgorithms(self._algName))
-            dependent.append(self._algName)
+            dependent = list(self.model.dependentChildAlgorithms(self.childId))
+            dependent.append(self.childId)
         opts = []
         for alg in list(self.model.childAlgorithms().values()):
             if alg.childId() not in dependent:
@@ -216,7 +217,7 @@ def showAdvancedParametersClicked(self):
                 self.labels[param.name()].setVisible(self.showAdvanced)
                 self.widgets[param.name()].setVisible(self.showAdvanced)
 
-    def getAvailableValuesOfType(self, paramType, outTypes=[], dataType=None):
+    def getAvailableValuesOfType(self, paramType, outTypes=[], dataTypes=[]):
         # upgrade paramType to list
         if paramType is None:
             paramType = []
@@ -227,41 +228,8 @@ def getAvailableValuesOfType(self, paramType, outTypes=[], dataType=None):
         elif not isinstance(outTypes, list):
             outTypes = [outTypes]
 
-        values = []
-        inputs = self.model.parameterComponents()
-        for i in list(inputs.values()):
-            param = self.model.parameterDefinition(i.parameterName())
-            for t in paramType:
-                if isinstance(param, t):
-                    if dataType is not None:
-                        if param.datatype in dataType:
-                            values.append(
-                                QgsProcessingModelAlgorithm.ChildParameterSource.fromModelParameter(param.name()))
-                    else:
-                        values.append(QgsProcessingModelAlgorithm.ChildParameterSource.fromModelParameter(param.name()))
-                    break
-        if not outTypes:
-            return values
-        if self._algName is None:
-            dependent = []
-        else:
-            dependent = list(self.model.dependentChildAlgorithms(self._algName))
-            dependent.append(self._algName)
-        for alg in list(self.model.childAlgorithms().values()):
-            if alg.childId() not in dependent:
-                for out in alg.algorithm().outputDefinitions():
-                    for t in outTypes:
-                        if isinstance(out, t):
-                            if dataType is not None and out.datatype in dataType:
-                                values.append(
-                                    QgsProcessingModelAlgorithm.ChildParameterSource.fromChildOutput(alg.childId(),
-                                                                                                     out.name()))
-                            else:
-                                values.append(
-                                    QgsProcessingModelAlgorithm.ChildParameterSource.fromChildOutput(alg.childId(),
-                                                                                                     out.name()))
-
-        return values
+        return self.model.availableSourcesForChild(self.childId, [p.typeName() for p in paramType if issubclass(p, QgsProcessingParameterDefinition)],
+                                                   [o.typeName() for o in outTypes if issubclass(o, QgsProcessingOutputDefinition)], dataTypes)
 
     def resolveValueDescription(self, value):
         if isinstance(value, QgsProcessingModelAlgorithm.ChildParameterSource):
@@ -277,8 +245,8 @@ def resolveValueDescription(self, value):
         return value
 
     def setPreviousValues(self):
-        if self._algName is not None:
-            alg = self.model.childAlgorithm(self._algName)
+        if self.childId is not None:
+            alg = self.model.childAlgorithm(self.childId)
             self.descriptionBox.setText(alg.description())
             for param in alg.algorithm().parameterDefinitions():
                 if param.isDestination() or param.flags() & QgsProcessingParameterDefinition.FlagHidden:
@@ -308,10 +276,10 @@ def setPreviousValues(self):
 
     def createAlgorithm(self):
         alg = QgsProcessingModelAlgorithm.ChildAlgorithm(self._alg.id())
-        if not self._algName:
+        if not self.childId:
             alg.generateChildId(self.model)
         else:
-            alg.setChildId(self._algName)
+            alg.setChildId(self.childId)
         alg.setDescription(self.descriptionBox.text())
         for param in self._alg.parameterDefinitions():
             if param.isDestination() or param.flags() & QgsProcessingParameterDefinition.FlagHidden:
diff --git a/python/plugins/processing/tools/dataobjects.py b/python/plugins/processing/tools/dataobjects.py
index 311755e85ccf..3d4a2f0db778 100644
--- a/python/plugins/processing/tools/dataobjects.py
+++ b/python/plugins/processing/tools/dataobjects.py
@@ -91,16 +91,18 @@ def createExpressionContext():
     context.appendScope(QgsExpressionContextUtils.globalScope())
     context.appendScope(QgsExpressionContextUtils.projectScope(QgsProject.instance()))
 
-    if iface.mapCanvas():
+    if iface and iface.mapCanvas():
         context.appendScope(QgsExpressionContextUtils.mapSettingsScope(iface.mapCanvas().mapSettings()))
 
     processingScope = QgsExpressionContextScope()
 
-    extent = iface.mapCanvas().fullExtent()
-    processingScope.setVariable('fullextent_minx', extent.xMinimum())
-    processingScope.setVariable('fullextent_miny', extent.yMinimum())
-    processingScope.setVariable('fullextent_maxx', extent.xMaximum())
-    processingScope.setVariable('fullextent_maxy', extent.yMaximum())
+    if iface and iface.mapCanvas():
+        extent = iface.mapCanvas().fullExtent()
+        processingScope.setVariable('fullextent_minx', extent.xMinimum())
+        processingScope.setVariable('fullextent_miny', extent.yMinimum())
+        processingScope.setVariable('fullextent_maxx', extent.xMaximum())
+        processingScope.setVariable('fullextent_maxy', extent.yMaximum())
+
     context.appendScope(processingScope)
     return context
 
diff --git a/src/core/processing/qgsprocessingmodelalgorithm.cpp b/src/core/processing/qgsprocessingmodelalgorithm.cpp
index 45e171640500..b6e0a252a551 100644
--- a/src/core/processing/qgsprocessingmodelalgorithm.cpp
+++ b/src/core/processing/qgsprocessingmodelalgorithm.cpp
@@ -678,7 +678,7 @@ QgsProcessingModelAlgorithm::ChildParameterSources QgsProcessingModelAlgorithm::
     {
       if ( !dataTypes.isEmpty() )
       {
-        if ( def->type() == QStringLiteral( "field" ) )
+        if ( def->type() == QgsProcessingParameterField::typeName() )
         {
           const QgsProcessingParameterField *fieldDef = static_cast< const QgsProcessingParameterField * >( def );
           if ( !( dataTypes.contains( fieldDef->dataType() ) || fieldDef->dataType() == QgsProcessingParameterField::Any ) )
@@ -686,7 +686,7 @@ QgsProcessingModelAlgorithm::ChildParameterSources QgsProcessingModelAlgorithm::
             continue;
           }
         }
-        else if ( def->type() == "source" )
+        else if ( def->type() == QgsProcessingParameterFeatureSource::typeName() )
         {
           const QgsProcessingParameterFeatureSource *sourceDef = static_cast< const QgsProcessingParameterFeatureSource *>( def );
           bool ok = !sourceDef->dataTypes().isEmpty();
@@ -729,7 +729,7 @@ QgsProcessingModelAlgorithm::ChildParameterSources QgsProcessingModelAlgorithm::
       {
         if ( !dataTypes.isEmpty() )
         {
-          if ( out->type() == QStringLiteral( "outputVector" ) )
+          if ( out->type() == QgsProcessingOutputVectorLayer::typeName() )
           {
             const QgsProcessingOutputVectorLayer *vectorOut = static_cast< const QgsProcessingOutputVectorLayer *>( out );
             if ( !( dataTypes.contains( vectorOut->dataType() ) || vectorOut->dataType() == QgsProcessingParameterDefinition::TypeAny ) )
diff --git a/src/core/processing/qgsprocessingoutputs.h b/src/core/processing/qgsprocessingoutputs.h
index 134362e09880..95b77f684f27 100644
--- a/src/core/processing/qgsprocessingoutputs.h
+++ b/src/core/processing/qgsprocessingoutputs.h
@@ -43,17 +43,17 @@ class CORE_EXPORT QgsProcessingOutputDefinition
 
 #ifdef SIP_RUN
     SIP_CONVERT_TO_SUBCLASS_CODE
-    if ( sipCpp->type() == "outputVector" )
+    if ( sipCpp->type() == QgsProcessingOutputVectorLayer::typeName() )
       sipType = sipType_QgsProcessingOutputVectorLayer;
-    else if ( sipCpp->type() == "outputRaster" )
+    else if ( sipCpp->type() == QgsProcessingOutputRasterLayer::typeName() )
       sipType = sipType_QgsProcessingOutputRasterLayer;
-    else if ( sipCpp->type() == "outputHtml" )
+    else if ( sipCpp->type() == QgsProcessingOutputHtml::typeName() )
       sipType = sipType_QgsProcessingOutputHtml;
-    else if ( sipCpp->type() == "outputNumber" )
+    else if ( sipCpp->type() == QgsProcessingOutputNumber::typeName() )
       sipType = sipType_QgsProcessingOutputNumber;
-    else if ( sipCpp->type() == "outputString" )
+    else if ( sipCpp->type() == QgsProcessingOutputString::typeName() )
       sipType = sipType_QgsProcessingOutputString;
-    else if ( sipCpp->type() == "outputFolder" )
+    else if ( sipCpp->type() == QgsProcessingOutputFolder::typeName() )
       sipType = sipType_QgsProcessingOutputFolder;
     SIP_END
 #endif
@@ -128,7 +128,11 @@ class CORE_EXPORT QgsProcessingOutputVectorLayer : public QgsProcessingOutputDef
      */
     QgsProcessingOutputVectorLayer( const QString &name, const QString &description = QString(), QgsProcessingParameterDefinition::LayerType type = QgsProcessingParameterDefinition::TypeVectorAny );
 
-    QString type() const override { return QStringLiteral( "outputVector" ); }
+    /**
+     * Returns the type name for the output class.
+     */
+    static QString typeName() { return QStringLiteral( "outputVector" ); }
+    QString type() const override { return typeName(); }
 
     /**
      * Returns the layer type for the output layer.
@@ -162,7 +166,13 @@ class CORE_EXPORT QgsProcessingOutputRasterLayer : public QgsProcessingOutputDef
      */
     QgsProcessingOutputRasterLayer( const QString &name, const QString &description = QString() );
 
-    QString type() const override { return QStringLiteral( "outputRaster" ); }
+    /**
+     * Returns the type name for the output class.
+     */
+    static QString typeName() { return QStringLiteral( "outputRaster" ); }
+    QString type() const override { return typeName(); }
+
+
 };
 
 /**
@@ -180,7 +190,12 @@ class CORE_EXPORT QgsProcessingOutputHtml : public QgsProcessingOutputDefinition
      */
     QgsProcessingOutputHtml( const QString &name, const QString &description = QString() );
 
-    QString type() const override { return QStringLiteral( "outputHtml" ); }
+    /**
+     * Returns the type name for the output class.
+     */
+    static QString typeName() { return QStringLiteral( "outputHtml" ); }
+    QString type() const override { return typeName(); }
+
 };
 
 /**
@@ -198,7 +213,11 @@ class CORE_EXPORT QgsProcessingOutputNumber : public QgsProcessingOutputDefiniti
      */
     QgsProcessingOutputNumber( const QString &name, const QString &description = QString() );
 
-    QString type() const override { return QStringLiteral( "outputNumber" ); }
+    /**
+     * Returns the type name for the output class.
+     */
+    static QString typeName() { return QStringLiteral( "outputNumber" ); }
+    QString type() const override { return typeName(); }
 };
 
 /**
@@ -216,7 +235,12 @@ class CORE_EXPORT QgsProcessingOutputString : public QgsProcessingOutputDefiniti
      */
     QgsProcessingOutputString( const QString &name, const QString &description = QString() );
 
-    QString type() const override { return QStringLiteral( "outputString" ); }
+    /**
+     * Returns the type name for the output class.
+     */
+    static QString typeName() { return QStringLiteral( "outputString" ); }
+    QString type() const override { return typeName(); }
+
 };
 
 /**
@@ -232,9 +256,15 @@ class CORE_EXPORT QgsProcessingOutputFolder : public QgsProcessingOutputDefiniti
     /**
      * Constructor for QgsProcessingOutputFolder.
      */
+
     QgsProcessingOutputFolder( const QString &name, const QString &description = QString() );
 
-    QString type() const override { return QStringLiteral( "outputFolder" ); }
+    /**
+     * Returns the type name for the output class.
+     */
+    static QString typeName() { return QStringLiteral( "outputFolder" ); }
+    QString type() const override { return typeName(); }
+
 };
 
 #endif // QGSPROCESSINGOUTPUTS_H
diff --git a/src/core/processing/qgsprocessingparameters.cpp b/src/core/processing/qgsprocessingparameters.cpp
index 274c4e4eb0b2..625880636d5d 100644
--- a/src/core/processing/qgsprocessingparameters.cpp
+++ b/src/core/processing/qgsprocessingparameters.cpp
@@ -747,49 +747,49 @@ QgsProcessingParameterDefinition *QgsProcessingParameters::parameterFromVariantM
   QString type = map.value( QStringLiteral( "parameter_type" ) ).toString();
   QString name = map.value( QStringLiteral( "name" ) ).toString();
   std::unique_ptr< QgsProcessingParameterDefinition > def;
-  if ( type == QStringLiteral( "boolean" ) )
+  if ( type == QgsProcessingParameterBoolean::typeName() )
     def.reset( new QgsProcessingParameterBoolean( name ) );
-  else if ( type == QStringLiteral( "crs" ) )
+  else if ( type == QgsProcessingParameterCrs::typeName() )
     def.reset( new QgsProcessingParameterCrs( name ) );
-  else if ( type == QStringLiteral( "layer" ) )
+  else if ( type == QgsProcessingParameterMapLayer::typeName() )
     def.reset( new QgsProcessingParameterMapLayer( name ) );
-  else if ( type == QStringLiteral( "extent" ) )
+  else if ( type == QgsProcessingParameterExtent::typeName() )
     def.reset( new QgsProcessingParameterExtent( name ) );
-  else if ( type == QStringLiteral( "point" ) )
+  else if ( type == QgsProcessingParameterPoint::typeName() )
     def.reset( new QgsProcessingParameterPoint( name ) );
-  else if ( type == QStringLiteral( "file" ) )
+  else if ( type == QgsProcessingParameterFile::typeName() )
     def.reset( new QgsProcessingParameterFile( name ) );
-  else if ( type == QStringLiteral( "matrix" ) )
+  else if ( type == QgsProcessingParameterMatrix::typeName() )
     def.reset( new QgsProcessingParameterMatrix( name ) );
-  else if ( type == QStringLiteral( "multilayer" ) )
+  else if ( type == QgsProcessingParameterMultipleLayers::typeName() )
     def.reset( new QgsProcessingParameterMultipleLayers( name ) );
-  else if ( type == QStringLiteral( "number" ) )
+  else if ( type == QgsProcessingParameterNumber::typeName() )
     def.reset( new QgsProcessingParameterNumber( name ) );
-  else if ( type == QStringLiteral( "range" ) )
+  else if ( type == QgsProcessingParameterRange::typeName() )
     def.reset( new QgsProcessingParameterRange( name ) );
-  else if ( type == QStringLiteral( "raster" ) )
+  else if ( type == QgsProcessingParameterRasterLayer::typeName() )
     def.reset( new QgsProcessingParameterRasterLayer( name ) );
-  else if ( type == QStringLiteral( "enum" ) )
+  else if ( type == QgsProcessingParameterEnum::typeName() )
     def.reset( new QgsProcessingParameterEnum( name ) );
-  else if ( type == QStringLiteral( "string" ) )
+  else if ( type == QgsProcessingParameterString::typeName() )
     def.reset( new QgsProcessingParameterString( name ) );
-  else if ( type == QStringLiteral( "expression" ) )
+  else if ( type == QgsProcessingParameterExpression::typeName() )
     def.reset( new QgsProcessingParameterExpression( name ) );
-  else if ( type == QStringLiteral( "vector" ) )
+  else if ( type == QgsProcessingParameterVectorLayer::typeName() )
     def.reset( new QgsProcessingParameterVectorLayer( name ) );
-  else if ( type == QStringLiteral( "field" ) )
+  else if ( type == QgsProcessingParameterField::typeName() )
     def.reset( new QgsProcessingParameterField( name ) );
-  else if ( type == QStringLiteral( "source" ) )
+  else if ( type == QgsProcessingParameterFeatureSource::typeName() )
     def.reset( new QgsProcessingParameterFeatureSource( name ) );
-  else if ( type == QStringLiteral( "sink" ) )
+  else if ( type == QgsProcessingParameterFeatureSink::typeName() )
     def.reset( new QgsProcessingParameterFeatureSink( name ) );
-  else if ( type == QStringLiteral( "vectorOut" ) )
+  else if ( type == QgsProcessingParameterVectorOutput::typeName() )
     def.reset( new QgsProcessingParameterVectorOutput( name ) );
-  else if ( type == QStringLiteral( "rasterOut" ) )
+  else if ( type == QgsProcessingParameterRasterOutput::typeName() )
     def.reset( new QgsProcessingParameterRasterOutput( name ) );
-  else if ( type == QStringLiteral( "fileOut" ) )
+  else if ( type == QgsProcessingParameterFileOutput::typeName() )
     def.reset( new QgsProcessingParameterFileOutput( name ) );
-  else if ( type == QStringLiteral( "folderOut" ) )
+  else if ( type == QgsProcessingParameterFolderOutput::typeName() )
     def.reset( new QgsProcessingParameterFolderOutput( name ) );
 
   if ( !def )
diff --git a/src/core/processing/qgsprocessingparameters.h b/src/core/processing/qgsprocessingparameters.h
index 8911f0e77022..5f4cab2a4b2f 100644
--- a/src/core/processing/qgsprocessingparameters.h
+++ b/src/core/processing/qgsprocessingparameters.h
@@ -185,49 +185,49 @@ class CORE_EXPORT QgsProcessingParameterDefinition
 
 #ifdef SIP_RUN
     SIP_CONVERT_TO_SUBCLASS_CODE
-    if ( sipCpp->type() == "boolean" )
+    if ( sipCpp->type() == QgsProcessingParameterBoolean::typeName() )
       sipType = sipType_QgsProcessingParameterBoolean;
-    else if ( sipCpp->type() == "crs" )
+    else if ( sipCpp->type() == QgsProcessingParameterCrs::typeName() )
       sipType = sipType_QgsProcessingParameterCrs;
-    else if ( sipCpp->type() == "layer" )
+    else if ( sipCpp->type() == QgsProcessingParameterMapLayer::typeName() )
       sipType = sipType_QgsProcessingParameterMapLayer;
-    else if ( sipCpp->type() == "extent" )
+    else if ( sipCpp->type() == QgsProcessingParameterExtent::typeName() )
       sipType = sipType_QgsProcessingParameterExtent;
-    else if ( sipCpp->type() == "point" )
+    else if ( sipCpp->type() == QgsProcessingParameterPoint::typeName() )
       sipType = sipType_QgsProcessingParameterPoint;
-    else if ( sipCpp->type() == "file" )
+    else if ( sipCpp->type() == QgsProcessingParameterFile::typeName() )
       sipType = sipType_QgsProcessingParameterFile;
-    else if ( sipCpp->type() == "matrix" )
+    else if ( sipCpp->type() == QgsProcessingParameterMatrix::typeName() )
       sipType = sipType_QgsProcessingParameterMatrix;
-    else if ( sipCpp->type() == "multilayer" )
+    else if ( sipCpp->type() == QgsProcessingParameterMultipleLayers::typeName() )
       sipType = sipType_QgsProcessingParameterMultipleLayers;
-    else if ( sipCpp->type() == "number" )
+    else if ( sipCpp->type() == QgsProcessingParameterNumber::typeName() )
       sipType = sipType_QgsProcessingParameterNumber;
-    else if ( sipCpp->type() == "range" )
+    else if ( sipCpp->type() == QgsProcessingParameterRange::typeName() )
       sipType = sipType_QgsProcessingParameterRange;
-    else if ( sipCpp->type() == "raster" )
+    else if ( sipCpp->type() == QgsProcessingParameterRasterLayer::typeName() )
       sipType = sipType_QgsProcessingParameterRasterLayer;
-    else if ( sipCpp->type() == "enum" )
+    else if ( sipCpp->type() == QgsProcessingParameterEnum::typeName() )
       sipType = sipType_QgsProcessingParameterEnum;
-    else if ( sipCpp->type() == "string" )
+    else if ( sipCpp->type() == QgsProcessingParameterString::typeName() )
       sipType = sipType_QgsProcessingParameterString;
-    else if ( sipCpp->type() == "expression" )
+    else if ( sipCpp->type() == QgsProcessingParameterExpression::typeName() )
       sipType = sipType_QgsProcessingParameterExpression;
-    else if ( sipCpp->type() == "vector" )
+    else if ( sipCpp->type() == QgsProcessingParameterVectorLayer::typeName() )
       sipType = sipType_QgsProcessingParameterVectorLayer;
-    else if ( sipCpp->type() == "field" )
+    else if ( sipCpp->type() == QgsProcessingParameterField::typeName() )
       sipType = sipType_QgsProcessingParameterField;
-    else if ( sipCpp->type() == "source" )
+    else if ( sipCpp->type() == QgsProcessingParameterFeatureSource::typeName() )
       sipType = sipType_QgsProcessingParameterFeatureSource;
-    else if ( sipCpp->type() == "sink" )
+    else if ( sipCpp->type() == QgsProcessingParameterFeatureSink::typeName() )
       sipType = sipType_QgsProcessingParameterFeatureSink;
-    else if ( sipCpp->type() == "vectorOut" )
+    else if ( sipCpp->type() == QgsProcessingParameterVectorOutput::typeName() )
       sipType = sipType_QgsProcessingParameterVectorOutput;
-    else if ( sipCpp->type() == "rasterOut" )
+    else if ( sipCpp->type() == QgsProcessingParameterRasterOutput::typeName() )
       sipType = sipType_QgsProcessingParameterRasterOutput;
-    else if ( sipCpp->type() == "fileOut" )
+    else if ( sipCpp->type() == QgsProcessingParameterFileOutput::typeName() )
       sipType = sipType_QgsProcessingParameterFileOutput;
-    else if ( sipCpp->type() == "folderOut" )
+    else if ( sipCpp->type() == QgsProcessingParameterFolderOutput::typeName() )
       sipType = sipType_QgsProcessingParameterFolderOutput;
     SIP_END
 #endif
@@ -628,7 +628,11 @@ class CORE_EXPORT QgsProcessingParameterBoolean : public QgsProcessingParameterD
     QgsProcessingParameterBoolean( const QString &name, const QString &description = QString(), const QVariant &defaultValue = QVariant(),
                                    bool optional = false );
 
-    QString type() const override { return QStringLiteral( "boolean" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "boolean" ); }
+    QString type() const override { return typeName(); }
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
     QString asScriptCode() const override;
 
@@ -654,7 +658,11 @@ class CORE_EXPORT QgsProcessingParameterCrs : public QgsProcessingParameterDefin
     QgsProcessingParameterCrs( const QString &name, const QString &description = QString(), const QVariant &defaultValue = QVariant(),
                                bool optional = false );
 
-    QString type() const override { return QStringLiteral( "crs" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "crs" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
 
@@ -681,7 +689,11 @@ class CORE_EXPORT QgsProcessingParameterMapLayer : public QgsProcessingParameter
     QgsProcessingParameterMapLayer( const QString &name, const QString &description = QString(), const QVariant &defaultValue = QVariant(),
                                     bool optional = false );
 
-    QString type() const override { return QStringLiteral( "layer" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "layer" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
 
@@ -708,7 +720,11 @@ class CORE_EXPORT QgsProcessingParameterExtent : public QgsProcessingParameterDe
     QgsProcessingParameterExtent( const QString &name, const QString &description = QString(), const QVariant &defaultValue = QVariant(),
                                   bool optional = false );
 
-    QString type() const override { return QStringLiteral( "extent" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "extent" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
 
@@ -736,7 +752,11 @@ class CORE_EXPORT QgsProcessingParameterPoint : public QgsProcessingParameterDef
     QgsProcessingParameterPoint( const QString &name, const QString &description = QString(), const QVariant &defaultValue = QVariant(),
                                  bool optional = false );
 
-    QString type() const override { return QStringLiteral( "point" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "point" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
 
     /**
@@ -769,7 +789,11 @@ class CORE_EXPORT QgsProcessingParameterFile : public QgsProcessingParameterDefi
     QgsProcessingParameterFile( const QString &name, const QString &description = QString(), Behavior behavior = File, const QString &extension = QString(), const QVariant &defaultValue = QVariant(),
                                 bool optional = false );
 
-    QString type() const override { return QStringLiteral( "file" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "file" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QString asScriptCode() const override;
 
@@ -829,7 +853,11 @@ class CORE_EXPORT QgsProcessingParameterMatrix : public QgsProcessingParameterDe
                                   const QVariant &defaultValue = QVariant(),
                                   bool optional = false );
 
-    QString type() const override { return QStringLiteral( "matrix" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "matrix" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
 
@@ -908,7 +936,11 @@ class CORE_EXPORT QgsProcessingParameterMultipleLayers : public QgsProcessingPar
                                           const QVariant &defaultValue = QVariant(),
                                           bool optional = false );
 
-    QString type() const override { return QStringLiteral( "multilayer" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "multilayer" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
     QString asScriptCode() const override;
@@ -982,7 +1014,11 @@ class CORE_EXPORT QgsProcessingParameterNumber : public QgsProcessingParameterDe
                                            double maxValue = DBL_MAX
                                          );
 
-    QString type() const override { return QStringLiteral( "number" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "number" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
 
@@ -1055,7 +1091,11 @@ class CORE_EXPORT QgsProcessingParameterRange : public QgsProcessingParameterDef
                                  const QVariant &defaultValue = QVariant(),
                                  bool optional = false );
 
-    QString type() const override { return QStringLiteral( "range" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "range" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
 
@@ -1100,7 +1140,11 @@ class CORE_EXPORT QgsProcessingParameterRasterLayer : public QgsProcessingParame
     QgsProcessingParameterRasterLayer( const QString &name, const QString &description = QString(), const QVariant &defaultValue = QVariant(),
                                        bool optional = false );
 
-    QString type() const override { return QStringLiteral( "raster" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "raster" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
 
@@ -1129,7 +1173,11 @@ class CORE_EXPORT QgsProcessingParameterEnum : public QgsProcessingParameterDefi
                                 const QVariant &defaultValue = QVariant(),
                                 bool optional = false );
 
-    QString type() const override { return QStringLiteral( "enum" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "enum" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
     QString asScriptCode() const override;
@@ -1190,7 +1238,11 @@ class CORE_EXPORT QgsProcessingParameterString : public QgsProcessingParameterDe
                                   bool multiLine = false,
                                   bool optional = false );
 
-    QString type() const override { return QStringLiteral( "string" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "string" ); }
+    QString type() const override { return typeName(); }
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
     QString asScriptCode() const override;
 
@@ -1237,7 +1289,11 @@ class CORE_EXPORT QgsProcessingParameterExpression : public QgsProcessingParamet
                                       const QString &parentLayerParameterName = QString(),
                                       bool optional = false );
 
-    QString type() const override { return QStringLiteral( "expression" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "expression" ); }
+    QString type() const override { return typeName(); }
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
     QStringList dependsOnOtherParameters() const override;
 
@@ -1284,7 +1340,11 @@ class CORE_EXPORT QgsProcessingParameterVectorLayer : public QgsProcessingParame
     QgsProcessingParameterVectorLayer( const QString &name, const QString &description = QString(), const QVariant &defaultValue = QVariant(),
                                        bool optional = false );
 
-    QString type() const override { return QStringLiteral( "vector" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "vector" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
 
@@ -1323,7 +1383,11 @@ class CORE_EXPORT QgsProcessingParameterField : public QgsProcessingParameterDef
                                  bool allowMultiple = false,
                                  bool optional = false );
 
-    QString type() const override { return QStringLiteral( "field" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "field" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
     QString asScriptCode() const override;
@@ -1398,7 +1462,11 @@ class CORE_EXPORT QgsProcessingParameterFeatureSource : public QgsProcessingPara
                                          const QList< int > &types = QList< int >(),
                                          const QVariant &defaultValue = QVariant(), bool optional = false );
 
-    QString type() const override { return QStringLiteral( "source" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "source" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
     QString asScriptCode() const override;
@@ -1508,7 +1576,11 @@ class CORE_EXPORT QgsProcessingParameterFeatureSink : public QgsProcessingDestin
     QgsProcessingParameterFeatureSink( const QString &name, const QString &description = QString(), QgsProcessingParameterDefinition::LayerType type = QgsProcessingParameterDefinition::TypeVectorAny, const QVariant &defaultValue = QVariant(),
                                        bool optional = false );
 
-    QString type() const override { return QStringLiteral( "sink" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "sink" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
     QString asScriptCode() const override;
@@ -1565,7 +1637,11 @@ class CORE_EXPORT QgsProcessingParameterVectorOutput : public QgsProcessingDesti
     QgsProcessingParameterVectorOutput( const QString &name, const QString &description = QString(), QgsProcessingParameterDefinition::LayerType type = QgsProcessingParameterDefinition::TypeVectorAny, const QVariant &defaultValue = QVariant(),
                                         bool optional = false );
 
-    QString type() const override { return QStringLiteral( "vectorOut" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "vectorOut" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
     QString asScriptCode() const override;
@@ -1621,7 +1697,11 @@ class CORE_EXPORT QgsProcessingParameterRasterOutput : public QgsProcessingDesti
                                         const QVariant &defaultValue = QVariant(),
                                         bool optional = false );
 
-    QString type() const override { return QStringLiteral( "rasterOut" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "rasterOut" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
     QgsProcessingOutputDefinition *toOutputDefinition() const override SIP_FACTORY;
@@ -1651,7 +1731,11 @@ class CORE_EXPORT QgsProcessingParameterFileOutput : public QgsProcessingDestina
                                       const QVariant &defaultValue = QVariant(),
                                       bool optional = false );
 
-    QString type() const override { return QStringLiteral( "fileOut" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "fileOut" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QString valueAsPythonString( const QVariant &value, QgsProcessingContext &context ) const override;
     QgsProcessingOutputDefinition *toOutputDefinition() const override SIP_FACTORY;
@@ -1700,7 +1784,11 @@ class CORE_EXPORT QgsProcessingParameterFolderOutput : public QgsProcessingDesti
                                         const QVariant &defaultValue = QVariant(),
                                         bool optional = false );
 
-    QString type() const override { return QStringLiteral( "folderOut" ); }
+    /**
+     * Returns the type name for the parameter class.
+     */
+    static QString typeName() { return QStringLiteral( "folderOut" ); }
+    QString type() const override { return typeName(); }
     bool checkValueIsAcceptable( const QVariant &input, QgsProcessingContext *context = nullptr ) const override;
     QgsProcessingOutputDefinition *toOutputDefinition() const override SIP_FACTORY;
     QString defaultFileExtension() const override;