/* Filename:  LstTable.cpp

   Programmer:  Br. David Carlson

   Date:  October 7, 1997

   Modified:  August 8, 1998

   Modified:  July 17, 2000 to use modern headers.

   This file implements the functions of the LstTableClass found in
   LstTable.h.
*/

#include "lsttable.h"


/* Given:  Nothing (other than the implicit LstTableClass object).
   Task:   To check whether this object is empty.
   Return: true if it is empty, false otherwise.
*/
bool LstTableClass::Empty(void) const
   {
   return List.Empty();   // Note the use of 2 different Empty functions!
   }


/* Given:  Item   A data item.
   Task:   To insert Item into the implicit object, a LstTableClass table.
   Return: true to indicate success (or false to indicate no success,
           though this isn't really used -- it's just here in case we want
           to expand the functionality in the future).  The implicit
           object is modified.
*/
bool LstTableClass::Insert(const ItemType & Item)
   {
   List.InsertFront(Item);
   return true;   //  assume success!
   }


/* Given:  Searchkey   A KeyFieldType value to look up.
   Task:   To look for SearchKey in the table given as the implicit object.
   Return: Item        The structure found that contains Searchkey.
           In the function name, returns true if SearchKey was found,
           false otherwise.
*/
bool LstTableClass::Retrieve(KeyFieldType SearchKey, ItemType & Item)
   {
   ListNodePtr NodePtr;
   ItemType Target;

   Target.KeyField = SearchKey;
   NodePtr = List.Find(Target);

   if (NodePtr == NULL)
      return false;
   else
      {
      NodePtr->GetInfo(Item);
      return true;
      }
   }