/*
* Melter.h
*
*  Created on: Oct 4, 2010
*      Author: daniele
*/

#ifndef MELTER_H_
#define MELTER_H_

#include "BufferObserver.h"
#include "prototypes.h"

class Chunk;
class IOManager;

class Melter : public ::prototype::BufferObserver
{
public:

	/**
	* Create a new Melter using the specified parser e mangler.
	* @param parser
	* @param mangler
	*/
	Melter(::prototype::Parser& parser, ::prototype::Mangler& mangler);
	virtual ~Melter();

	/**
	*
	*/
	void update();
	/**
	*
	*/
	bool isDefective();

	/**
	* Set defective state of Melter. Default argument is true.
	* When in defective state, Melter deregisters itself as observer of the input buffer, and
	* writes are sent directly to output buffer.
	* @param state true to enable defetive state.
	*/
	void setDefective(bool state = true);

	/**
	* Feed new data for the parser/mangler to process.
	* @param data pointer to buffer containing data to be fed.
	* @param len number of bytes of data in buffer.
	* @return number of bytes written.
	*/
	std::size_t write( char const * data, std::size_t len );

	/**
	* Feed a chunk for the parser/mangler to process.
	* @param chunk chunk of data to append.
	* @return number of bytes written.
	*/
	std::size_t write( Chunk &chunk );

	/**
	* Check if buffer is empty.
	* @return true if empty, false otherwise.
	*/
	bool empty();

	/**
	* Gets any available output.
	* @return a chunk of data.
	*/
	Chunk read();

private:
	IOManager* _io;

	::prototype::Parser& _parser;
	::prototype::Mangler& _mangler;

	bool _defective;
};

#endif /* MELTER_H_ */