Description Holger Schill 2011-05-26 05:03:00 EDT

Created attachment 196644 [details]
patch to solve the problem

If you have a grammar like this:

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals

generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"

Model:
	persons+=Person*
;
Person:
	kind=TYPE
;
enum TYPE :
	good | bad
;


You will get a ClassCastException by unsing the ValueConverter. This happens because in 

org.eclipse.xtext.serializer.acceptor.SequenceFeeder.getToken(RuleCall, Object, INode)

there is nobody taking care if it is a enum. Because of that for all assignments the ValueSerializer is used. 

org.eclipse.xtext.serializer.tokens.ValueSerializer.serializeAssignedValue(EObject, RuleCall, Object, INode, Acceptor)

This causes the problem because there is no ValueConverter that can handle Enums.
Instead of the ValueSerializer the EnumSerializer should be used in 
org.eclipse.xtext.serializer.acceptor.SequenceFeeder.getToken(RuleCall, Object, INode).

The attached patch solves the problem. I have written an testcase but I could not find other testcases for the serializer independent from xbase of xtend2.
@Moritz Please let me know where we should put common testcases for the serializer.