Simplify overly complex code

python/analysis/network/qgsnetworkspeedstrategy.sip

@@ -28,18 +28,8 @@ class QgsNetworkSpeedStrategy : QgsNetworkStrategy
 
     virtual QVariant cost( double distance, const QgsFeature &f ) const;
 
-%Docstring
-Returns edge cost
- :rtype: QVariant
-%End
-
-    virtual QgsAttributeList requiredAttributes() const;
+    virtual QSet< int > requiredAttributes() const;
 
-%Docstring
- Returns list of the source layer attributes needed for cost calculation.
- This method called by QgsGraphDirector.
- :rtype: QgsAttributeList
-%End
 
 };
 

python/analysis/network/qgsnetworkstrategy.sip

@@ -45,12 +45,11 @@ class QgsNetworkStrategy
 
     virtual ~QgsNetworkStrategy();
 
-    virtual QgsAttributeList requiredAttributes() const;
+    virtual QSet< int > requiredAttributes() const;
 %Docstring
- Returns list of the source layer attributes needed for cost calculation.
- This method called by QgsGraphDirector.
- :return: list of required attributes
- :rtype: QgsAttributeList
+ Returns a list of the source layer attributes needed for cost calculation.
+ This is method called by QgsGraphDirector.
+ :rtype: set of int
 %End
 
     virtual QVariant cost( double distance, const QgsFeature &f ) const = 0;

src/analysis/network/qgsnetworkspeedstrategy.cpp

@@ -36,9 +36,9 @@ QVariant QgsNetworkSpeedStrategy::cost( double distance, const QgsFeature &f ) c
   return QVariant( val );
 }
 
-QgsAttributeList QgsNetworkSpeedStrategy::requiredAttributes() const
+QSet<int> QgsNetworkSpeedStrategy::requiredAttributes() const
 {
-  QgsAttributeList l;
-  l.push_back( mAttributeId );
+  QSet< int > l;
+  l.insert( mAttributeId );
   return l;
 }

src/analysis/network/qgsnetworkspeedstrategy.h

@@ -35,14 +35,8 @@ class ANALYSIS_EXPORT QgsNetworkSpeedStrategy : public QgsNetworkStrategy
      */
     QgsNetworkSpeedStrategy( int attributeId, double defaultValue, double toMetricFactor );
 
-    //! Returns edge cost
     QVariant cost( double distance, const QgsFeature &f ) const override;
-
-    /**
-     * Returns list of the source layer attributes needed for cost calculation.
-     * This method called by QgsGraphDirector.
-     */
-    QgsAttributeList requiredAttributes() const override;
+    QSet< int > requiredAttributes() const override;
 
   private:
     int mAttributeId;

src/analysis/network/qgsnetworkstrategy.h

@@ -63,11 +63,10 @@ class ANALYSIS_EXPORT QgsNetworkStrategy
     virtual ~QgsNetworkStrategy() = default;
 
     /**
-     * Returns list of the source layer attributes needed for cost calculation.
-     * This method called by QgsGraphDirector.
-     * \returns list of required attributes
+     * Returns a list of the source layer attributes needed for cost calculation.
+     * This is method called by QgsGraphDirector.
      */
-    virtual QgsAttributeList requiredAttributes() const { return QgsAttributeList(); }
+    virtual QSet< int > requiredAttributes() const { return QSet< int >(); }
 
     /**
      * Returns edge cost

src/analysis/network/qgsvectorlayerdirector.cpp

@@ -124,6 +124,20 @@ QString QgsVectorLayerDirector::name() const
   return QStringLiteral( "Vector line" );
 }
 
+QgsAttributeList QgsVectorLayerDirector::requiredAttributes() const
+{
+  QSet< int > attrs;
+
+  if ( mDirectionFieldId != -1 )
+    attrs.insert( mDirectionFieldId );
+
+  for ( const QgsNetworkStrategy *strategy : mStrategies )
+  {
+    attrs.unite( strategy->requiredAttributes() );
+  }
+  return attrs.toList();
+}
+
 void QgsVectorLayerDirector::makeGraph( QgsGraphBuilderInterface *builder, const QVector< QgsPointXY > &additionalPoints,
                                         QVector< QgsPointXY > &snappedPoints, QgsFeedback *feedback ) const
 {
@@ -155,7 +169,6 @@ void QgsVectorLayerDirector::makeGraph( QgsGraphBuilderInterface *builder, const
   QgsFeatureIterator fit = mSource->getFeatures( QgsFeatureRequest().setSubsetOfAttributes( QgsAttributeList() ) );
 
   // begin: tie points to the graph
-  QgsAttributeList la;
   QgsFeature feature;
   while ( fit.nextFeature( feature ) )
   {
@@ -244,43 +257,8 @@ void QgsVectorLayerDirector::makeGraph( QgsGraphBuilderInterface *builder, const
 
   std::sort( pointLengthMap.begin(), pointLengthMap.end(), TiePointInfoCompare );
 
-  {
-    // fill attribute list 'la'
-    QgsAttributeList tmpAttr;
-    if ( mDirectionFieldId != -1 )
-    {
-      tmpAttr.push_back( mDirectionFieldId );
-    }
-
-    QList< QgsNetworkStrategy * >::const_iterator it;
-    QgsAttributeList::const_iterator it2;
-
-    for ( it = mStrategies.constBegin(); it != mStrategies.constEnd(); ++it )
-    {
-      QgsAttributeList tmp = ( *it )->requiredAttributes();
-      for ( it2 = tmp.constBegin(); it2 != tmp.constEnd(); ++it2 )
-      {
-        tmpAttr.push_back( *it2 );
-      }
-    }
-    std::sort( tmpAttr.begin(), tmpAttr.end() );
-
-    int lastAttrId = -1;
-    for ( it2 = tmpAttr.constBegin(); it2 != tmpAttr.constEnd(); ++it2 )
-    {
-      if ( *it2 == lastAttrId )
-      {
-        continue;
-      }
-
-      la.push_back( *it2 );
-
-      lastAttrId = *it2;
-    }
-  } // end fill attribute list 'la'
-
   // begin graph construction
-  fit = mSource->getFeatures( QgsFeatureRequest().setSubsetOfAttributes( la ) );
+  fit = mSource->getFeatures( QgsFeatureRequest().setSubsetOfAttributes( requiredAttributes() ) );
   while ( fit.nextFeature( feature ) )
   {
     if ( feedback && feedback->isCanceled() )

src/analysis/network/qgsvectorlayerdirector.h

@@ -87,6 +87,8 @@ class ANALYSIS_EXPORT QgsVectorLayerDirector : public QgsGraphDirector
     QString mReverseDirectionValue;
     QString mBothDirectionValue;
     Direction mDefaultDirection;
+
+    QgsAttributeList requiredAttributes() const;
 };
 
 #endif // QGSVECTORLAYERDIRECTOR_H