/*
* call-seq:
* graph.contexts -> array
*
* Returns an Array of URIs describing the contexts in the receiving graph.
*
*/
static VALUE
rleaf_redleaf_graph_contexts( VALUE self ) {
rleaf_GRAPH *ptr = rleaf_get_graph( self );
librdf_iterator *iter;
librdf_node *context_node;
VALUE context = Qnil;
VALUE rval = rb_ary_new();
int count = 0;
if ( (iter = librdf_model_get_contexts(ptr->model)) == NULL ) {
rleaf_log_with_context( self, "info", "couldn't fetch a context iterator; "
"contexts not supported?" );
return rval;
}
rleaf_log_with_context( self, "debug", "iterating over contexts for graph 0x%x", self );
while ( ! librdf_iterator_end(iter) ) {
context_node = librdf_iterator_get_context( iter );
context = rleaf_librdf_uri_node_to_object( context_node );
rleaf_log_with_context( self, "debug", " context %d: %s",
count, RSTRING_PTR(rb_inspect(context)) );
rb_ary_push( rval, context );
librdf_iterator_next( iter );
}
librdf_free_iterator( iter );
return rval;
}
static int
rasqal_redland_new_triples_source(rasqal_query* rdf_query,
void *factory_user_data,
void *user_data,
rasqal_triples_source *rts)
{
librdf_world *world=(librdf_world*)factory_user_data;
rasqal_redland_triples_source_user_data* rtsc=(rasqal_redland_triples_source_user_data*)user_data;
raptor_sequence *seq;
librdf_query_rasqal_context *context;
librdf_iterator* cit;
rtsc->world = world;
rtsc->query = (librdf_query*)rasqal_query_get_user_data(rdf_query);
context = (librdf_query_rasqal_context*)rtsc->query->context;
rtsc->model = context->model;
seq = rasqal_query_get_data_graph_sequence(rdf_query);
/* FIXME: queries with data graphs in them (such as FROM in SPARQL)
* are deleted, so that there are no unexpected data loads
*/
if(seq) {
while(raptor_sequence_size(seq)) {
rasqal_data_graph* dg=(rasqal_data_graph*)raptor_sequence_pop(seq);
rasqal_free_data_graph(dg);
}
}
if(librdf_model_supports_contexts(rtsc->model)) {
/* Add all contexts (named graphs) to the query so Rasqal can bind them */
cit = librdf_model_get_contexts(rtsc->model);
while(!librdf_iterator_end(cit)) {
librdf_node* node = (librdf_node*)librdf_iterator_get_object(cit);
librdf_uri* uri;
raptor_uri* source_uri;
rasqal_data_graph* dg;
uri = librdf_node_get_uri(node);
source_uri = (raptor_uri*)raptor_new_uri(world->raptor_world_ptr,
librdf_uri_as_string(uri));
dg = rasqal_new_data_graph_from_uri(world->rasqal_world_ptr,
source_uri, source_uri,
RASQAL_DATA_GRAPH_NAMED,
NULL, NULL, NULL);
rasqal_query_add_data_graph(rdf_query, dg);
raptor_free_uri(source_uri);
librdf_iterator_next(cit);
}
librdf_free_iterator(cit);
}
#ifdef RASQAL_TRIPLES_SOURCE_MIN_VERSION
rts->version = 1;
#endif
rts->init_triples_match=rasqal_redland_init_triples_match;
rts->triple_present=rasqal_redland_triple_present;
rts->free_triples_source=rasqal_redland_free_triples_source;
return 0;
}
