List<Transferrable> transferrables = (List) data;
for (Transferrable transferrable : transferrables) {
if (transferrable instanceof TransferrableField) {
TransferrableField field = (TransferrableField) transferrable;
Undoable insertFieldAction = new InsertFieldAction(
this.classDef.getClassFile(), field.getFieldName(),
field.getDescriptor(), new AccessFlags(field
.getAccessFlags()));
ga.add(insertFieldAction);
} else if (transferrable instanceof TransferrableMethod) {