/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2014 by Blender Foundation.
 * All rights reserved.
 *
 * Contributor(s): Sergey SHarybin.
 *
 * ***** END GPL LICENSE BLOCK *****
 */
#ifndef __BKE_LIBRARY_QUERY_H__
#define __BKE_LIBRARY_QUERY_H__

/** \file BKE_library_query.h
 *  \ingroup bke
 *  \since March 2014
 *  \author sergey
 */

struct ID;

/* Tips for the callback for cases it's gonna to modify the pointer. */
enum {
	IDWALK_NOP = 0,
	IDWALK_NEVER_NULL = (1 << 0),
	IDWALK_NEVER_SELF = (1 << 1),
};

/* Call a callback for each ID link which the given ID uses.
 *
 * Return 'false' if you want to stop iteration.
 */
typedef bool (*LibraryIDLinkCallback) (void *user_data, struct ID **id_pointer, int cd_flag);

/* Flags for the foreach function itself. */
enum {
	IDWALK_READONLY = (1 << 0),
};

/* Loop over all of the ID's this datablock links to. */
void BKE_library_foreach_ID_link(struct ID *id, LibraryIDLinkCallback callback, void *user_data, int flag);

#endif  /* __BKE_LIBRARY_QUERY_H__ */