/**
* librdf_iterator_add_map - Add a librdf_iterator mapping function
* @iterator: the iterator
* @fn: the function to operate
* @free_context: the function to use to free the context (or NULL)
* @map_context: the context to pass to the map function
*
* Adds an iterator mapping function which operates over the iterator to
* select which elements are returned; it will be applied as soon as
* this method is called.
*
* Several mapping functions can be added and they are applied in
* the order given
*
* The mapping function should return non 0 to allow the element to be
* returned.
*
* Return value: Non 0 on failure
**/
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)
{
librdf_iterator_map *map;
if(!iterator->map_list) {
iterator->map_list=librdf_new_list(iterator->world);
if(!iterator->map_list)
return 1;
}
map=(librdf_iterator_map*)LIBRDF_CALLOC(librdf_iterator_map, sizeof(librdf_iterator_map), 1);
if(!map)
return 1;
map->fn=map_function;
map->free_context=free_context;
map->context=map_context;
if(librdf_list_add(iterator->map_list, map)) {
LIBRDF_FREE(librdf_iterator_map, map);
return 1;
}
return 0;
}
/**
* librdf_stream_add_map:
* @stream: the stream
* @map_function: the function to perform the mapping
* @free_context: the function to use to free the context (or NULL)
* @map_context: the context to pass to the map function
*
* Add a librdf_stream mapping function.
*
* Adds an stream mapping function which operates over the stream to
* select which elements are returned; it will be applied as soon as
* this method is called.
*
* Several mapping functions can be added and they are applied in
* the order given.
*
* The mapping function should return the statement to return, or NULL
* to remove it from the stream.
*
* Return value: Non 0 on failure
**/
int
librdf_stream_add_map(librdf_stream* stream,
librdf_stream_map_handler map_function,
librdf_stream_map_free_context_handler free_context,
void *map_context)
{
librdf_stream_map *map;
if(!stream->map_list) {
stream->map_list=librdf_new_list(stream->world);
if(!stream->map_list) {
if(free_context && map_context)
(*free_context)(map_context);
return 1;
}
}
map=(librdf_stream_map*)LIBRDF_CALLOC(librdf_stream_map, sizeof(librdf_stream_map), 1);
if(!map) {
if(free_context && map_context)
(*free_context)(map_context);
return 1;
}
map->fn=map_function;
map->free_context=free_context;
map->context=map_context;
if(librdf_list_add(stream->map_list, map)) {
LIBRDF_FREE(librdf_stream_map, map);
if(free_context && map_context)
(*free_context)(map_context);
return 1;
}
return 0;
}
