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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* camelDataWrapper.c : Abstract class for a data_wrapper */
/** THIS IS MOSTLY AN ABSTRACT CLASS THAT SHOULD HAVE BEEN AN
INTERFACE. **/
/*
*
* Copyright (C) 1999 Bertrand Guiheneuf <Bertrand.Guiheneuf@inria.fr> .
*
* This program is free 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include "camel-data-wrapper.h"
static GtkObjectClass *parent_class=NULL;
/* Returns the class for a CamelDataWrapper */
#define CDH_CLASS(so) CAMEL_DATA_WRAPPER_CLASS (GTK_OBJECT(so)->klass)
static void _construct_from_stream (CamelDataWrapper *data_wrapper, CamelStream *stream, guint size);
static void _write_to_stream (CamelDataWrapper *data_wrapper, CamelStream *stream);
static void
camel_data_wrapper_class_init (CamelDataWrapperClass *camel_data_wrapper_class)
{
parent_class = gtk_type_class (gtk_object_get_type ());
/* virtual method definition */
camel_data_wrapper_class->write_to_stream = _write_to_stream;
camel_data_wrapper_class->construct_from_stream = _construct_from_stream;
/* virtual method overload */
}
GtkType
camel_data_wrapper_get_type (void)
{
static GtkType camel_data_wrapper_type = 0;
if (!camel_data_wrapper_type) {
GtkTypeInfo camel_data_wrapper_info =
{
"CamelDataWrapper",
sizeof (CamelDataWrapper),
sizeof (CamelDataWrapperClass),
(GtkClassInitFunc) camel_data_wrapper_class_init,
(GtkObjectInitFunc) NULL,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
camel_data_wrapper_type = gtk_type_unique (gtk_object_get_type (), &camel_data_wrapper_info);
}
return camel_data_wrapper_type;
}
/**
* _write_to_stream: write data content in a byte stream
* @data_wrapper: the data wrapper object
* @stre:m byte stream where data will be written
*
* This method must be overriden by subclasses
* Data must be written in the bytes stream
* in a architecture independant fashion.
* If data is a standard data (for example an jpg image)
* it must be serialized in the strea exactly as it
* would be saved on disk. A simple dump of the stream in
* a file should be sufficient for the data to be
* re-read by a foreign application.
*
**/
static void
_write_to_stream (CamelDataWrapper *data_wrapper, CamelStream *stream)
{
/* nothing */
}
/**
* camel_data_wrapper_write_to_stream: write data in a stream
* @data_wrapper: the data wrapper object
* @stream: byte stream where data will be written
*
* Write data content in a stream. Data is stored in a machine
* independant format.
*
**/
void
camel_data_wrapper_write_to_stream (CamelDataWrapper *data_wrapper, CamelStream *stream)
{
CDH_CLASS(data_wrapper)->write_to_stream (data_wrapper, stream);
}
static void
_construct_from_stream (CamelDataWrapper *data_wrapper, CamelStream *stream, guint size)
{
/* nothing */
}
void
camel_data_wrapper_construct_from_stream (CamelDataWrapper *data_wrapper, CamelStream *stream, guint size)
{
CDH_CLASS(data_wrapper)->construct_from_stream (data_wrapper, stream, size);
}
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