/*
  OpenCommand opens a document whose name is supplied by the user. 
  An OpenCommand must be passed an Application object in its constructor. 
  AskUser is an implementation routine that prompts the user for the name of the document to open.
*/

class OpenCommand : public Command {
public:
    OpenCommand(Application*);

    virtual void Execute();
protected:
    virtual const char* AskUser();
private:
    Application* _application;
    char* _response;
};

OpenCommand::OpenCommand (Application* a) {
    _application = a;
}
void OpenCommand::Execute () {
    const char* name = AskUser();

    if (name != 0) {
        Document* document = new Document(name);
        _application->Add(document);
        document->Open();
    }
}