PyQGIS: few additions for more pythonic api

- QgsVectorLayer and QgsVectorDataProvider support iterating
- QgsFeature allows direct access to attributes (get/set/del)


git-svn-id: http://svn.osgeo.org/qgis/trunk@12878 c8812cc2-4d05-0410-92ff-de0c093fc19c

python/core/qgsfeature.sip

@@ -8,6 +8,32 @@ class QgsFeature
     
   public:
 
+    SIP_PYOBJECT __getitem__(int key);
+%MethodCode
+  const QgsAttributeMap& attrMap = sipCpp->attributeMap();
+  QgsAttributeMap::const_iterator it = attrMap.find(a0);
+  if (it == attrMap.end())
+    PyErr_SetString(PyExc_KeyError, QByteArray::number(a0));
+  else
+  {
+    QVariant* v = new QVariant(it.value());
+    sipRes = sipConvertFromInstance(v, sipClass_QVariant, Py_None);
+  }
+%End
+
+    void __setitem__(int key, QVariant value);
+%MethodCode
+  sipCpp->addAttribute(a0, *a1);
+%End
+
+    void __delitem__(int key);
+%MethodCode
+  if (sipCpp->attributeMap().contains(a0))
+    sipCpp->deleteAttribute(a0);
+  else
+    PyErr_SetString(PyExc_KeyError, QByteArray::number(a0));
+%End
+
     //! Constructor
     QgsFeature(int id = 0, QString typeName = "" );
 

python/core/qgsvectordataprovider.sip

@@ -7,6 +7,23 @@ class QgsVectorDataProvider : QgsDataProvider
 
     public:
 
+  QgsVectorDataProvider* __iter__();
+%MethodCode
+    sipRes = sipCpp;
+%End
+
+  SIP_PYOBJECT __next__();
+%MethodCode
+    QgsFeature* f = new QgsFeature;
+    if (sipCpp->nextFeature(*f))
+      sipRes = sipConvertFromInstance(f, sipClass_QgsFeature, Py_None);
+    else
+    {
+      delete f;
+      PyErr_SetString(PyExc_StopIteration,"");
+    }
+%End
+
       // If you add to this, please also add to capabilitiesString()
       /**
        * enumeration with capabilities that providers might implement

python/core/qgsvectorlayer.sip

@@ -5,6 +5,25 @@ class QgsVectorLayer : QgsMapLayer
 %End
 
 public:
+
+  QgsVectorLayer* __iter__();
+%MethodCode
+    sipRes = sipCpp;
+%End
+
+  SIP_PYOBJECT __next__();
+%MethodCode
+    QgsFeature* f = new QgsFeature;
+    if (sipCpp->nextFeature(*f))
+      sipRes = sipConvertFromInstance(f, sipClass_QgsFeature, Py_None);
+    else
+    {
+      delete f;
+      PyErr_SetString(PyExc_StopIteration,"");
+    }
+%End
+
+
   enum EditType { 
     LineEdit,
     UniqueValues,