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/*
 * XSEC
 *
 * XSECTXFMInputSource := Transfomer InputSource for Xerces Parser.
 *
 * Author(s): Berin Lautenbach
 *
 * $Id: XSECTXFMInputSource.hpp,v 1.3 2003/03/02 08:21:02 blautenb Exp $
 *
 * $Log: XSECTXFMInputSource.hpp,v $
 * Revision 1.3  2003/03/02 08:21:02  blautenb
 * Fixes for a clean doxygen run
 *
 * Revision 1.2  2003/02/21 11:53:09  blautenb
 * TXFMChain to prevent memory leaks
 *
 * Revision 1.1  2003/02/17 11:19:12  blautenb
 * Class to use a transform as an InputSource to Xerces
 *
 *					 
 */


#ifndef XSECTXFMINPUTSOURCE_INCLUDE
#define XSECTXFMINPUTSOURCE_INCLUDE

#include <xsec/framework/XSECDefs.hpp>
#include <xercesc/sax/InputSource.hpp>

class TXFMChain;

XSEC_DECLARE_XERCES_CLASS(BinInputStream);

/**
 * @brief InputSource wrapper for a TXFMList.
 * @ingroup interfaces
 *
 * This class provides a wrapper for a TXFMList.  It is used to provide 
 * an input to the Xerces Parser.
 *
 * @note This is a one-off use class.  In the process of providing bytes to
 * the parser, it runs through the transforms, which (currently) cannot be
 * reset.
 *
 */


class DSIG_EXPORT XSECTXFMInputSource : public XERCES_CPP_NAMESPACE_QUALIFIER InputSource
{

public :

	/** @name Constructors and Destructors */
	//@{

	/**
	 * \brief Construct around an existing transform list
	 *
	 * @param lst The final TXFM element in the input chain.
	 * @param deleteWhenDone Flag to instruct the class to delete the chain when
	 * done.  By default set to true.
	 */

    XSECTXFMInputSource(TXFMChain * lst, bool deleteWhenDone = true);

	/**
	 * \brief Destructor
	 *
	 * Delete the object.  If deleteWhenDone was set during construction, will
	 * delete the chain if it has not already been done.
	 */

    virtual ~XSECTXFMInputSource();

	//@}

	/** @name Stream management methods */
	//@{

	/**
	 * \brief Interface method
	 *
	 * Returns an InputStream that can be read by the parser
	 */

	BinInputStream* makeStream() const;

	//@}

private :

	mutable TXFMChain			* mp_chain;			// End point of list
	bool						m_deleteWhenDone;	// Do we delete?

};


#endif /* XSECTXFMINPUTSOURCE_INCLUDE */