ArrayBag.cpp

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//  Created by Frank M. Carrano and Timothy M. Henry.
//  Copyright (c) 2017 Pearson Education, Hoboken, New Jersey.

#include "ArrayBag.h"
#include <cstddef>

template<class ItemType>
ArrayBag<ItemType>::ArrayBag(): itemCount(0), maxItems(DEFAULT_CAPACITY)
{
}  // end default constructor

template<class ItemType>
int ArrayBag<ItemType>::getCurrentSize() const
{
  return itemCount;
}  // end getCurrentSize

template<class ItemType>
bool ArrayBag<ItemType>::isEmpty() const
{
  return itemCount == 0;
}  // end isEmpty

template<class ItemType>
bool ArrayBag<ItemType>::add(const ItemType& newEntry)
{
  bool hasRoomToAdd = (itemCount < maxItems);
  if (hasRoomToAdd)
  {
    items[itemCount] = newEntry;
    itemCount++;
  }  // end if
    
  return hasRoomToAdd;
}  // end add

template<class ItemType>
bool ArrayBag<ItemType>::remove(const ItemType& anEntry)
{
   int locatedIndex = getIndexOf(anEntry);
  bool canRemoveItem = !isEmpty() && (locatedIndex > -1);
  if (canRemoveItem)
  {
    itemCount--;
    items[locatedIndex] = items[itemCount];
  }  // end if
    
  return canRemoveItem;
}  // end remove

template<class ItemType>
void ArrayBag<ItemType>::clear()
{
  itemCount = 0;
}  // end clear

template<class ItemType>
int ArrayBag<ItemType>::getFrequencyOf(const ItemType& anEntry) const
{
   int frequency = 0;
   int curIndex = 0;       // Current array index
   while (curIndex < itemCount)
   {
      if (items[curIndex] == anEntry)
      {
         frequency++;
      }  // end if
      
      curIndex++;          // Increment to next entry
   }  // end while
   
   return frequency;
}  // end getFrequencyOf

template<class ItemType>
bool ArrayBag<ItemType>::contains(const ItemType& anEntry) const
{
  return getIndexOf(anEntry) > -1;
}  // end contains

template<class ItemType>
std::vector<ItemType> ArrayBag<ItemType>::toVector() const
{
  std::vector<ItemType> bagContents;
  for (int i = 0; i < itemCount; i++)
    bagContents.push_back(items[i]);
      
   return bagContents;
}  // end toVector

// private
template<class ItemType>
int ArrayBag<ItemType>::getIndexOf(const ItemType& target) const
{
  bool found = false;
   int result = -1;
   int searchIndex = 0;
   
   // If the bag is empty, itemCount is zero, so loop is skipped
   while (!found && (searchIndex < itemCount))
   {
      if (items[searchIndex] == target)
      {
         found = true;
         result = searchIndex;
      } 
      else
      {
         searchIndex++;
      }  // end if
   }  // end while
   
   return result;
}  // end getIndexOf