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/* -*- Mode: c; c-basic-offset: 2 -*-
 *
 * rdf_iterator.h - RDF Iterator definition
 *
 * Copyright (C) 2000-2008, David Beckett http://www.dajobe.org/
 * Copyright (C) 2000-2005, University of Bristol, UK http://www.bristol.ac.uk/
 * 
 * This package is Free Software and part of Redland http://librdf.org/
 * 
 * It is licensed under the following three licenses as alternatives:
 *   1. GNU Lesser General Public License (LGPL) V2.1 or any newer version
 *   2. GNU General Public License (GPL) V2 or any newer version
 *   3. Apache License, V2.0 or any newer version
 * 
 * You may not use this file except in compliance with at least one of
 * the above three licenses.
 * 
 * See LICENSE.html or LICENSE.txt at the top of this package for the
 * complete terms and further detail along with the license texts for
 * the licenses in COPYING.LIB, COPYING and LICENSE-2.0.txt respectively.
 * 
 * 
 */



#ifndef LIBRDF_ITERATOR_H
#define LIBRDF_ITERATOR_H

#ifdef __cplusplus
extern "C" {
#endif

/**
 * librdf_iterator_map_handler: 
 * @iterator: Iterator that this map is operating over.
 * @map_context: Map data context pointer.
 * @item: Pointer to the current item in the iteration.
 *
 * Map function for a #librdf_iterator map operation.
 *
 * See librdf_iterator_add_map().
 *
 * Returns: item in keep the iteration or NULL to remove it
 */
typedef void* (*librdf_iterator_map_handler)(librdf_iterator *iterator, void *map_context, void *item);


/**
 * librdf_iterator_map_free_context_handler:
 * @map_context: Map data context pointer.
 *
 * Free handler function for a #librdf_iterator map operation.
 *
 * See librdf_iterator_add_map().
 */
typedef void (*librdf_iterator_map_free_context_handler)(void *map_context);

#ifdef LIBRDF_INTERNAL
#include <rdf_iterator_internal.h>
#endif


/**
 * librdf_iterator_get_method_flags:
 * @LIBRDF_ITERATOR_GET_METHOD_GET_CONTEXT: get context from iterator - implementing librdf_iterator_get_object()
 * @LIBRDF_ITERATOR_GET_METHOD_GET_OBJECT: get object from iterator - implementing librdf_iterator_get_context()
 * @LIBRDF_ITERATOR_GET_METHOD_GET_KEY: get iterator key object from iterator - implementing librdf_iterator_get_key()
 * @LIBRDF_ITERATOR_GET_METHOD_GET_VALUE: get iterator value from iterator - implementing librdf_iterator_get_value()
 *
 * Flags for librdf_new_iterator() get_method function pointer.
*/
/* iterator get_method flags */
typedef enum {
  LIBRDF_ITERATOR_GET_METHOD_GET_OBJECT  = 0,
  LIBRDF_ITERATOR_GET_METHOD_GET_CONTEXT = 1,
  LIBRDF_ITERATOR_GET_METHOD_GET_KEY     = 2,
  LIBRDF_ITERATOR_GET_METHOD_GET_VALUE   = 3
} librdf_iterator_get_method_flags;


REDLAND_API
librdf_iterator* librdf_new_iterator(librdf_world *world, void *context, int (*is_end_method)(void*), int (*next_method)(void*), void* (*get_method)(void*, int), void (*finished_method)(void*));

REDLAND_API
void librdf_free_iterator(librdf_iterator* iterator);

REDLAND_API
int librdf_iterator_end(librdf_iterator* iterator);
REDLAND_API REDLAND_DEPRECATED
int librdf_iterator_have_elements(librdf_iterator* iterator);

REDLAND_API
int librdf_iterator_next(librdf_iterator* iterator);
REDLAND_API
void* librdf_iterator_get_object(librdf_iterator* iterator);
REDLAND_API
void* librdf_iterator_get_context(librdf_iterator* iterator);
REDLAND_API
void* librdf_iterator_get_key(librdf_iterator* iterator);
REDLAND_API
void* librdf_iterator_get_value(librdf_iterator* iterator);

REDLAND_API
int librdf_iterator_add_map(librdf_iterator* iterator, librdf_iterator_map_handler map_function, librdf_iterator_map_free_context_handler free_context, void *map_context);

REDLAND_API
librdf_iterator* librdf_new_empty_iterator(librdf_world *world);

#ifdef __cplusplus
}
#endif

#endif