protected Object doGetValue(Object source)
  {
    EObject eObject = (EObject)source;
    List< ? > list = (List< ? >)eObject.eGet(eStructuralFeature);
    int idx = elementAccess.getReadValueIndex(list);
    if (idx != WriteData.NO_INDEX)
    {
      return list.get(idx);
    }
    return null;
  }

public class EMFListValueProperty extends SimpleValueProperty
{
	private final EStructuralFeature eStructuralFeature;
	private final ListElementAccess elementAccess;
	private IListProperty delegate;

	public EMFListValueProperty(IListProperty delegate, EStructuralFeature eStructuralFeature, ListElementAccess elementAccess)
	{
		this.eStructuralFeature = eStructuralFeature;
		this.elementAccess = elementAccess;
		this.delegate = delegate;
	}

	public Object getValueType()
	{
		return eStructuralFeature;
	}

	@Override
	protected Object doGetValue(Object source)
	{
		List< ? > list = (List< ? >)delegate.getList(source);
		int idx = elementAccess.getReadValueIndex(list);
		if (idx != WriteData.NO_INDEX)
		{
			return list.get(idx);
		}
		return null;
	}

	...
}