/** @file StackL.cpp */

#include "StackL.h"    // header file

Stack::Stack()
{
}

// Copy constructor
Stack::Stack(const Stack& aStack) : aList(aStack.aList)
{
}

Stack::~Stack()
{
}

bool Stack::isEmpty() const
{
   return aList.isEmpty();
}

void Stack::push(const StackItemType& newItem)
  throw(StackException)
{
  try{
    aList.insert(1, newItem);
  }
  catch (ListException e){
    throw StackException("StackException: cannot push item.");
  }
  catch (ListIndexOutOfRangeException e){
    throw StackException("StackException: cannot push item.");
  }
}

void Stack::pop() throw(StackException)
{
  try{
    aList.remove(1);
  }
  catch (ListIndexOutOfRangeException e){
    throw StackException("StackException: stack empty on pop");
  }
}

void Stack::pop(StackItemType& stackTop) throw(StackException)
{
  try{
    aList.retrieve(1, stackTop);
    aList.remove(1);
  }
  catch (ListIndexOutOfRangeException e){
    throw StackException("StackException: stack empty on pop");
  }
}

void Stack::getTop(StackItemType& stackTop) const throw(StackException)
{
  try{
    aList.retrieve(1, stackTop);
  }
  catch (ListIndexOutOfRangeException e){
    throw StackException("StackException: stack empty on getTop");
  }
}