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resurrected pool in new sense: now it's factory, producing&accounting memory chunks for read[autofree] buffers

/** @file
	Parser: exception decls.

	Copyright (c) 2001, 2003 ArtLebedev Group (http://www.artlebedev.com)
	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
*/

#ifndef PA_EXCEPTION_H
#define PA_EXCEPTION_H

static const char* IDENT_EXCEPTION_H="$Date: 2003/01/23 17:05:33 $";

//#include "pa_types.h"
#include "pa_pool.h"

// forwards

class String;
typedef object_ptr<const String> ConstStringPtr;

// defines

class Exception {
public:

	static ConstStringPtr undefined_source;

	Exception();
	Exception(
		const char *atype,
		ConstStringPtr aproblem_source, 
		const char *comment_fmt, ...);
	Exception(const Exception& src):
		ftype(src.ftype),
		fproblem_source(src.fproblem_source),
		fcomment(src.fcomment) {
	}
	Exception& operator =(const Exception& src) {
		ftype=src.ftype;
		fproblem_source=src.fproblem_source;
		fcomment=src.fcomment;
		return *this;
	}

#ifdef XML
	Exception(
		const String *aproblem_source, 
		GdomeException& exc);
#endif

	/// extracts exception type
	const char *type(bool can_be_empty=false) const { 
		if(can_be_empty)
			return ftype; 
		else
			return ftype?ftype:"<no type>";
	}
	/// extracts exception problem_source
	ConstStringPtr problem_source() const;	/// extracts exception comment
	const char *comment(bool can_be_empty=false) const { 
		const char *result=fcomment.get()!=0 && *fcomment.get()?fcomment.get():0;
		if(can_be_empty)
			return result; 
		else
			return result?result:"<no comment>";
	}

private:

	const char *ftype;
	ConstStringPtr fproblem_source;
	ConstCharPtr fcomment;

};

#endif