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// object.hh -- PDF objects
// Copyright (C) 2008 SEIKO EPSON CORPORATION
//
// This file is part of the 'iscan' program.
//
// The 'iscan' program is free-ish software.
// You can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation;
// either version 2 of the License or at your option any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of FITNESS
// FOR A PARTICULAR PURPOSE or MERCHANTABILITY.
// See the GNU General Public License for more details.
//
// You should have received a verbatim copy of the GNU General Public
// License along with this program; if not, write to:
//
// Free Software Foundation, Inc.
// 59 Temple Place, Suite 330
// Boston, MA 02111-1307 USA
//
// As a special exception, the copyright holders give permission
// to link the code of this program with the esmod library and
// distribute linked combinations including the two. You must obey
// the GNU General Public License in all respects for all of the
// code used other than esmod.
#ifndef iscan_pdf_object_hh_included
#define iscan_pdf_object_hh_included
#ifndef __cplusplus
#error "This is a C++ header file; use a C++ compiler to compile it."
#endif
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <cstdlib>
#include <cstdio>
namespace iscan
{
namespace pdf
{
using namespace std;
/*! A base class for all pdf objects [p 51].
*
* A pdf::object is also used to pass around object numbers in a transparent
* fashion so that object references can be output correctly as elements of
* arrays and dictionaries.
*/
class object
{
private:
size_t _obj_num;
static size_t next_obj_num; // the next free object number
public:
object ();
/*! Creates a new pdf::object with its object number set to \a num.
*
* Constructs an indirect object.
*/
object (size_t num);
virtual ~object (void);
/*! Obtain the pdf::object's object number.
*
* If the object has not been allocated an object number yet, a new one is
* allocated and returned.
*/
size_t obj_num ();
/*! Determine whether the object is direct or indirect [p 63].
*
* Probably don't need this method.
*
* @return True if the object is direct, False if it is indirect
*/
bool is_direct () const;
/*! Output the object contents.
*
* In the case of pdf::object, this only outputs an indirect reference to
* itself [p 64].
*
* Each subclass re-implements this in order to print its own content.
* It should only ever output the object contents, ommitting the object
* definition header and footer [p 64]
*/
virtual void print (FILE* fp) const;
/*! Compare the contents of two pdf::objects.
*
* Only the object contents are compared, the object number of the two
* objects can be different.
*
* In the case of pdf::object, the object numbers are compared.
*/
virtual bool operator== (object& that) const;
/*! Reset the current object number to recycle them for new documents
*/
static void reset_object_numbers ();
};
} // namespace pdf
} // namespace iscan
#endif // iscan_pdf_object_hh_included
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