/* gda-data-handler.h
 *
 * Copyright (C) 2003 - 2005 Vivien Malerba
 *
 * 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
 */


#ifndef __GDA_DATA_HANDLER_H_
#define __GDA_DATA_HANDLER_H_

#include <glib-object.h>
#include "gda-decl.h"
#include "gda-value.h"

G_BEGIN_DECLS

#define GDA_TYPE_DATA_HANDLER          (gda_data_handler_get_type())
#define GDA_DATA_HANDLER(obj)          G_TYPE_CHECK_INSTANCE_CAST (obj, GDA_TYPE_DATA_HANDLER, GdaDataHandler)
#define GDA_IS_DATA_HANDLER(obj)       G_TYPE_CHECK_INSTANCE_TYPE (obj, GDA_TYPE_DATA_HANDLER)
#define GDA_DATA_HANDLER_GET_IFACE(obj) (G_TYPE_INSTANCE_GET_INTERFACE ((obj), GDA_TYPE_DATA_HANDLER, GdaDataHandlerIface))


/* struct for the interface */
struct _GdaDataHandlerIface
{
	GTypeInterface           g_iface;

	/* virtual table */
	gchar           *(* get_sql_from_value)   (GdaDataHandler *dh, const GdaValue *value);
	gchar           *(* get_str_from_value)   (GdaDataHandler *dh, const GdaValue *value);
	GdaValue        *(* get_value_from_sql)   (GdaDataHandler *dh, const gchar *sql, GdaValueType type);
	GdaValue        *(* get_value_from_str)   (GdaDataHandler *dh, const gchar *str, GdaValueType type);
	GdaValue        *(* get_sane_init_value)  (GdaDataHandler *dh, GdaValueType type);

	guint            (* get_nb_gda_types)     (GdaDataHandler * dh);
	GdaValueType     (* get_gda_type_index)   (GdaDataHandler * dh, guint index);
	gboolean         (* accepts_gda_type)     (GdaDataHandler * dh, GdaValueType type);
	const gchar     *(* get_descr)            (GdaDataHandler * dh);
};




GType        gda_data_handler_get_type               (void);

/* Simple data manipulation */
gchar           *gda_data_handler_get_sql_from_value     (GdaDataHandler * dh, const GdaValue *value);
gchar           *gda_data_handler_get_str_from_value     (GdaDataHandler * dh, const GdaValue *value);
GdaValue        *gda_data_handler_get_value_from_sql     (GdaDataHandler * dh, const gchar *sql, GdaValueType type);
GdaValue        *gda_data_handler_get_value_from_str     (GdaDataHandler * dh, const gchar *str, GdaValueType type);
GdaValue        *gda_data_handler_get_sane_init_value    (GdaDataHandler * dh, GdaValueType type);

/* information about the data handler itself */
guint            gda_data_handler_get_nb_gda_types       (GdaDataHandler * dh);
GdaValueType     gda_data_handler_get_gda_type_index     (GdaDataHandler * dh, guint index);
gboolean         gda_data_handler_accepts_gda_type       (GdaDataHandler * dh, GdaValueType type);
const gchar     *gda_data_handler_get_descr              (GdaDataHandler * dh);

G_END_DECLS

#endif