Create Maps in EMF - the other way

EMF wiki on Eclipsepedia has a post which shows you one method of creating maps in EMF.
I feel that the suggested method in wiki will not exactly allow you to access a map as it should be.
like say - myMap.put("key", value); Instead you'll have to do:

myMap.eSet(keyFeature, "key");
myMap.eSet(valueFeature, valueObj);

After some trails here's the second method summarized in terms of steps.
To create a map using Reflective Ecore Editor:

• create an EAttribute and set a name (let's say _map) to it.
• set _map's EType as EMap [java.util.Map]
• create an ETypedParameter for key and set EType accordingly
• crate another ETypedParameter for value and set EType accordingly.

here is a snap shot of how a map looks in the Ecore Editor.

what happens behind the scenes of the editor ?
well, these lines of code are executed.

EAttribute _map = EcoreFactory.eINSTANCE.createEAttribute();
_map.setName("_map");
EGenericType _mapType = EcoreFactory.eINSTANCE.createEGenericType();
_mapType.setEClassifier(EcorePackage.eINSTANCE.getEMap());
// set key
EGenericType key = EcoreFactory.eINSTANCE.createEGenericType();
key.setEClassifier(EcorePackage.eINSTANCE.getEString());
// set key
EGenericType value = EcoreFactory.eINSTANCE.createEGenericType();
value.setEClassifier(EcorePackage.eINSTANCE.getEObject());
// add them
_mapType.getETypeArguments().add(key);
_mapType.getETypeArguments().add(value);
_map.setEGenericType(_mapType);


You have to use it like this:

Map _map = (Map) instance
.eGet(_mapFeature); // this is now java.util.Map
// don't forget to set the changes on _map back to instance!

Happy mapping!