public void insertEntry(EntryType entry) {
   if (lookup(entry.getId(), entry.getParams()) == null) {
     entries.add(entry);
   } else {
     throw new SemanticException(
         entry.getId()
             + " is already registered in this symbolTable. "
             + "You may want to update instead. 3"
             + lookup(entry.getId(), entry.getParams())
             + ":"
             + entry);
   }
 }
 /**
  * This is basically the method to look for function definitions.
  *
  * @param name function name
  * @param params function parameter
  * @return The Entry for this method
  */
 public EntryType lookup(String name, List<EntryType> params) {
   EntryType ret = null;
   for (EntryType entry : entries) {
     if (entry.getId().equals(name)) {
       boolean found = true;
       if (entry.getParams().size() == params.size()) {
         for (int i = 0; i < params.size(); i++) {
           if (!entry.getParams().get(i).equals(params.get(i))) {
             found = false;
           }
         }
       } else {
         found = false;
       }
       if (found) ret = entry;
     }
   }
   return ret;
 }