/**
 * proxy.h
 * Implemented by Blueprint Technologies, Inc.
 */

#ifndef _proxy_h
#define _proxy_h

/**
 * Defines a common interface for RealSubject and Proxy
 * so that a Proxy can be used anywhere a RealSubject
 * is expected.
 */

class Subject
{

public:
	virtual void request() = 0;

};

/**
 * Defines the real object that the proxy represents.
 */

class RealSubject: public Subject
{

public:
	virtual void request()
	{
		// Do something.
	};
};

/**
 * Maintains a reference so that lets the proxy access the
 * real subject. Proxy may refer to a Subject if the RealSubject
 * and Subject interfaces are the same. Provides an interface 
 * identical to Subject's so that a proxy can be substituted 
 * for the real subject.Controls access to the real subject and
 * may be responsible for creating and deleting it.
 */

class Proxy: public Subject
{

private:
	RealSubject* subject;

public:
	virtual void request()
	{
		/**
		 * This is overly simplified. The connection to the
		 * real subject may be over a network, into a database, etc.
		 */

		subject -> request();
	};

	/**
	 * Accessors.
	 */

	RealSubject* getSubject()
	{
		return subject;
	};

	void setSubject( RealSubject* subject )
	{
		this -> subject = subject;
	};

};

#endif