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

#ifndef _chain_h
#define _chain_h

/**
 * Defines an interface for handling requests. Implements
 * the successor link.
 */

class Handler
{

private:
	Handler* successor;

public:
	Handler(): successor(0)
	{
	};

	virtual void handleRequest() = 0;

	Handler* getSuccessor()
	{
		return successor;
	};

	void setSuccessor( Handler* successor )
	{
		this -> successor = successor;
	};

};

/**
 * Handles requests it is responsible for. Can access its
 * successor. If the ConcreteHandler can handle the request,
 * it does so; otherwise it forwards the request to its
 * successor.
 */

class ConcreteHandler1: public Handler
{

public:
	virtual void handleRequest()
	{
		// Can we handle this?

		if( getSuccessor() )
		{
			// No, pass it down.

			getSuccessor() -> handleRequest();
		}
	};

};

/**
 * Handles requests it is responsible for. Can access its
 * successor. If the ConcreteHandler can handle the request,
 * it does so; otherwise it forwards the request to its
 * successor.
 */

class ConcreteHandler2: public Handler
{

public:
	virtual void handleRequest()
	{
		// Can we handle this?

		if( getSuccessor() )
		{
			// No, pass it down.

			getSuccessor() -> handleRequest();
		}
	};

};

#endif