case PARAMETER :
VariableElementImpl variableElementImpl = (VariableElementImpl) e;
binding = variableElementImpl._binding;
if (binding instanceof FieldBinding) {
FieldBinding fieldBinding = (FieldBinding) binding;
FieldDeclaration fieldDeclaration = fieldBinding.sourceField();
if (fieldDeclaration != null) {
ReferenceBinding declaringClass = fieldBinding.declaringClass;
if (declaringClass instanceof SourceTypeBinding) {
SourceTypeBinding sourceTypeBinding = (SourceTypeBinding) declaringClass;
TypeDeclaration typeDeclaration = (TypeDeclaration) sourceTypeBinding.scope.referenceContext();