/////////////////////////////////////////////////////////////////////////
//  factory.cpp  -  implements factory method                          //
//                                                                     //
//  Demonstrates use of a factory class to create a product family     //
//  on behalf of the client.  This factory is bound to the product     //
//  family so that the client does not have to be.                     //
//                                                                     //
//  Jim Fawcett, CSE687 - Object Oriented Design, Spring 2001          //
/////////////////////////////////////////////////////////////////////////

#include <iostream>
#include "factory.h"
#include "facade.h"
using namespace std;

//----< void constructor >-----------------------------------------------

factory::factory() : pPA(NULL) {

  cout << "\n  constructing factory";
}

//----< destructor >-----------------------------------------------------

factory::~factory() {

  cout << "\n  destroying factory";
}

//----< factory method >-------------------------------------------------
//
//  This is a Singleton.  Only one facade can be created.
//
productAbstraction* factory::createProduct() {

  if(pPA == NULL) {
    pPA = static_cast<productAbstraction*>(new facade);
    return pPA;
  }
  return pPA;
}