IContainer Interface

 //This code segment implements the IContainer interface.  The code segment
 //containing the implementation of ISite and IComponent can be found in the documentation
 //for those interfaces.
 //Implement the LibraryContainer using the IContainer interface.
 ref class LibraryContainer: public IContainer
 {
 private:
    ArrayList^ m_bookList;

 public:
    LibraryContainer()
    {
       m_bookList = gcnew ArrayList;
    }

    virtual void Add( IComponent^ book )
    {

       //The book will be added without creation of the ISite object.
       m_bookList->Add( book );
    }

    virtual void Add( IComponent^ book, String^ ISNDNNum )
    {
       for ( int i = 0; i < m_bookList->Count; ++i )
       {
          IComponent^ curObj = static_cast<IComponent^>(m_bookList->default[ i ]);
          if ( curObj->Site != nullptr )
          {
             if ( curObj->Site->Name->Equals( ISNDNNum ) )
                            throw gcnew SystemException( "The ISBN number already exists in the container" );
          }

       }
       ISBNSite^ data = gcnew ISBNSite( this,book );
       data->Name = ISNDNNum;
       book->Site = data;
       m_bookList->Add( book );
    }

    virtual void Remove( IComponent^ book )
    {
       for ( int i = 0; i < m_bookList->Count; ++i )
       {
          if ( book->Equals( m_bookList->default[ i ] ) )
          {
             m_bookList->RemoveAt( i );
             break;
          }

       }
    }


    property ComponentCollection^ Components 
    {
       virtual ComponentCollection^ get() 
       {
          array<IComponent^>^datalist = gcnew array<BookComponent^>(m_bookList->Count);
          m_bookList->CopyTo( datalist );
          return gcnew ComponentCollection( datalist );
       }

    }

    ~LibraryContainer()
    {
       for ( int i = 0; i < m_bookList->Count; ++i )
       {
          IComponent^ curObj = static_cast<IComponent^>(m_bookList->default[ i ]);
          delete curObj;

       }
       m_bookList->Clear();
    }



 };



 [STAThreadAttribute]
 int main()
    {
       LibraryContainer^ cntrExmpl = gcnew LibraryContainer;
       try
       {
          BookComponent^ book1 = gcnew BookComponent( "Wizard's First Rule","Terry Gooodkind" );
          cntrExmpl->Add( book1, "0812548051" );
          BookComponent^ book2 = gcnew BookComponent( "Stone of Tears","Terry Gooodkind" );
          cntrExmpl->Add( book2, "0812548094" );
          BookComponent^ book3 = gcnew BookComponent( "Blood of the Fold","Terry Gooodkind" );
          cntrExmpl->Add( book3, "0812551478" );
          BookComponent^ book4 = gcnew BookComponent( "The Soul of the Fire","Terry Gooodkind" );

          //This will generate exception because the ISBN already exists in the container.
          cntrExmpl->Add( book4, "0812551478" );
       }
       catch ( SystemException^ e ) 
       {
          Console::WriteLine(  "Error description: {0}", e->Message );
       }

       ComponentCollection^ datalist = cntrExmpl->Components;
       IEnumerator^ denum = datalist->GetEnumerator();
       while ( denum->MoveNext() )
       {
          BookComponent^ cmp = static_cast<BookComponent^>(denum->Current);
          Console::WriteLine( "Book Title: {0}", cmp->Title );
          Console::WriteLine(  "Book Author: {0}", cmp->Author );
          Console::WriteLine(  "Book ISBN: {0}", cmp->Site->Name );
       }

return 0;
    }