Add method to QgsAttributes to convert to QgsAttributeMap

Author: nyalldawson

src/core/qgsfeature.cpp

@@ -29,6 +29,23 @@ email                : sherman at mrcc.com
  * See details in QEP #17
  ****************************************************************************/
 
+
+QgsAttributeMap QgsAttributes::toMap() const
+{
+  QgsAttributeMap map;
+  for ( int idx = 0; idx < count(); ++idx )
+  {
+    QVariant v = at( idx );
+    if ( v.isValid() )
+      map.insert( idx, v );
+  }
+  return map;
+}
+
+//
+// QgsFeature
+//
+
 QgsFeature::QgsFeature( QgsFeatureId id )
 {
   d = new QgsFeaturePrivate( id );
@@ -327,3 +344,4 @@ uint qHash( const QgsFeature& key, uint seed )
 
   return hash;
 }
+

src/core/qgsfeature.h

@@ -107,6 +107,14 @@ class CORE_EXPORT QgsAttributes : public QVector<QVariant>
       return true;
     }
 
+    /**
+     * Returns a QgsAttributeMap of the attribute values. Null values are
+     * excluded from the map.
+     * @note added in QGIS 3.0
+     * @note not available in Python bindings
+     */
+    QgsAttributeMap toMap() const;
+
     inline bool operator!=( const QgsAttributes &v ) const { return !( *this == v ); }
 };
 

tests/src/core/testqgsfeature.cpp

@@ -33,6 +33,7 @@ class TestQgsFeature: public QObject
     void init();// will be called before each testfunction is executed.
     void cleanup();// will be called after every testfunction.
     void attributesTest(); //test QgsAttributes
+    void attributesToMap();
     void create();//test creating a feature
     void copy();// test cpy destruction (double delete)
     void assignment();
@@ -120,6 +121,28 @@ void TestQgsFeature::attributesTest()
   QCOMPARE( attr7.size(), 5 );
 }
 
+void TestQgsFeature::attributesToMap()
+{
+  QgsAttributes attr1;
+  attr1 << QVariant( 5 ) << QVariant() << QVariant( "val" );
+  QgsAttributeMap map1 = attr1.toMap();
+
+  QCOMPARE( map1.count(), 2 );
+  QCOMPARE( map1.value( 0 ), QVariant( 5 ) );
+  QCOMPARE( map1.value( 2 ), QVariant( "val" ) );
+
+  QgsAttributes attr2;
+  attr2 << QVariant() << QVariant( 5 ) << QVariant();
+  QgsAttributeMap map2 = attr2.toMap();
+
+  QCOMPARE( map2.count(), 1 );
+  QCOMPARE( map2.value( 1 ), QVariant( 5 ) );
+
+  QgsAttributes attr3;
+  QgsAttributeMap map3 = attr3.toMap();
+  QVERIFY( map3.isEmpty() );
+}
+
 void TestQgsFeature::create()
 {
   //test constructors