/** * rasqal_row_to_nodes: * @row: Result row * * INTERNAL - Turn the given result row literals into RDF strings, URIs or blank literals. * * Return value: non-0 on failure */ int rasqal_row_to_nodes(rasqal_row* row) { int i; if(!row) return 1; for(i = 0; i < row->size; i++) { if(row->values[i]) { rasqal_literal* new_l; new_l = rasqal_literal_as_node(row->values[i]); if(!new_l) return -1; rasqal_free_literal(row->values[i]); row->values[i] = new_l; } } return 0; }
/** * rasqal_query_results_get_triple: * @query_results: #rasqal_query_results query_results * * Get the current triple in the result. * * The return value is a shared #raptor_statement. * * Return value: #raptor_statement or NULL if failed or results exhausted **/ raptor_statement* rasqal_query_results_get_triple(rasqal_query_results* query_results) { rasqal_query* query; int rc; rasqal_triple *t; rasqal_literal *s, *p, *o; raptor_statement *rs = NULL; unsigned char *nodeid; int skipped; RASQAL_ASSERT_OBJECT_POINTER_RETURN_VALUE(query_results, rasqal_query_results, NULL); if(query_results->failed || query_results->finished) return NULL; if(!rasqal_query_results_is_graph(query_results)) return NULL; query = query_results->query; if(!query) return NULL; if(query->verb == RASQAL_QUERY_VERB_DESCRIBE) return NULL; /* ensure we have a row to work on */ if(rasqal_query_results_ensure_have_row_internal(query_results)) return NULL; skipped = 0; while(1) { if(skipped) { rc = rasqal_query_results_next(query_results); if(rc) { rs = NULL; break; } query_results->current_triple_result = -1; } if(query_results->current_triple_result < 0) query_results->current_triple_result = 0; t = (rasqal_triple*)raptor_sequence_get_at(query->constructs, query_results->current_triple_result); rs = &query_results->result_triple; s = rasqal_literal_as_node(t->subject); if(!s) { rasqal_log_error_simple(query_results->world, RAPTOR_LOG_LEVEL_WARN, &query->locator, "Triple with unbound subject skipped"); skipped = 1; continue; } /* raptor v2 terms are copied, not shared */ if(rs->subject) { raptor_free_term(rs->subject); rs->subject = NULL; } switch(s->type) { case RASQAL_LITERAL_URI: rs->subject = raptor_new_term_from_uri(query_results->world->raptor_world_ptr, s->value.uri); break; case RASQAL_LITERAL_BLANK: nodeid = rasqal_prefix_id(query_results->result_count, (unsigned char*)s->string); rasqal_free_literal(s); if(!nodeid) { rasqal_log_error_simple(query_results->world, RAPTOR_LOG_LEVEL_FATAL, &query->locator, "Could not prefix subject blank identifier"); return NULL; } s = rasqal_new_simple_literal(query_results->world, RASQAL_LITERAL_BLANK, nodeid); if(!s) { rasqal_log_error_simple(query_results->world, RAPTOR_LOG_LEVEL_FATAL, &query->locator, "Could not create a new subject blank literal"); return NULL; } rs->subject = raptor_new_term_from_blank(query_results->world->raptor_world_ptr, nodeid); break; case RASQAL_LITERAL_QNAME: case RASQAL_LITERAL_PATTERN: case RASQAL_LITERAL_XSD_STRING: case RASQAL_LITERAL_BOOLEAN: case RASQAL_LITERAL_INTEGER: case RASQAL_LITERAL_DOUBLE: case RASQAL_LITERAL_FLOAT: case RASQAL_LITERAL_VARIABLE: case RASQAL_LITERAL_DECIMAL: case RASQAL_LITERAL_DATETIME: case RASQAL_LITERAL_UDT: case RASQAL_LITERAL_INTEGER_SUBTYPE: /* QNames should be gone by the time expression eval happens * Everything else is removed by rasqal_literal_as_node() above. */ case RASQAL_LITERAL_STRING: /* string [literal] subjects are not RDF */ case RASQAL_LITERAL_UNKNOWN: default: /* case RASQAL_LITERAL_STRING: */ rasqal_log_error_simple(query_results->world, RAPTOR_LOG_LEVEL_WARN, &query->locator, "Triple with non-URI/blank node subject skipped"); skipped = 1; break; } if(skipped) { if(s) rasqal_free_literal(s); continue; } p = rasqal_literal_as_node(t->predicate); if(!p) { rasqal_log_error_simple(query_results->world, RAPTOR_LOG_LEVEL_WARN, &query->locator, "Triple with unbound predicate skipped"); rasqal_free_literal(s); skipped = 1; continue; } switch(p->type) { case RASQAL_LITERAL_URI: /* raptor v2 terms are copied, not shared */ if(rs->predicate) { raptor_free_term(rs->predicate); rs->predicate = NULL; } rs->predicate = raptor_new_term_from_uri(query_results->world->raptor_world_ptr, p->value.uri); break; case RASQAL_LITERAL_QNAME: case RASQAL_LITERAL_PATTERN: case RASQAL_LITERAL_XSD_STRING: case RASQAL_LITERAL_BOOLEAN: case RASQAL_LITERAL_INTEGER: case RASQAL_LITERAL_DOUBLE: case RASQAL_LITERAL_FLOAT: case RASQAL_LITERAL_VARIABLE: case RASQAL_LITERAL_DECIMAL: case RASQAL_LITERAL_DATETIME: case RASQAL_LITERAL_UDT: case RASQAL_LITERAL_INTEGER_SUBTYPE: /* QNames should be gone by the time expression eval happens * Everything else is removed by rasqal_literal_as_node() above. */ case RASQAL_LITERAL_BLANK: case RASQAL_LITERAL_STRING: /* blank node or string [literal] predicates are not RDF */ case RASQAL_LITERAL_UNKNOWN: default: rasqal_log_error_simple(query_results->world, RAPTOR_LOG_LEVEL_WARN, &query->locator, "Triple with non-URI predicate skipped"); skipped = 1; break; } if(skipped) { rasqal_free_literal(s); if(p) rasqal_free_literal(p); continue; } o = rasqal_literal_as_node(t->object); if(!o) { rasqal_log_error_simple(query_results->world, RAPTOR_LOG_LEVEL_WARN, &query->locator, "Triple with unbound object skipped"); rasqal_free_literal(s); rasqal_free_literal(p); skipped = 1; continue; } /* raptor v2 terms are copied, not shared */ if(rs->object) { raptor_free_term(rs->object); rs->object = NULL; } switch(o->type) { case RASQAL_LITERAL_URI: rs->object = raptor_new_term_from_uri(query_results->world->raptor_world_ptr, o->value.uri); break; case RASQAL_LITERAL_BLANK: nodeid = rasqal_prefix_id(query_results->result_count, (unsigned char*)o->string); rasqal_free_literal(o); if(!nodeid) { rasqal_log_error_simple(query_results->world, RAPTOR_LOG_LEVEL_FATAL, &query->locator, "Could not prefix blank identifier"); rasqal_free_literal(s); rasqal_free_literal(p); return NULL; } o = rasqal_new_simple_literal(query_results->world, RASQAL_LITERAL_BLANK, nodeid); if(!o) { rasqal_log_error_simple(query_results->world, RAPTOR_LOG_LEVEL_FATAL, &query->locator, "Could not create a new subject blank literal"); rasqal_free_literal(s); rasqal_free_literal(p); return NULL; } rs->object = raptor_new_term_from_blank(query_results->world->raptor_world_ptr, nodeid); break; case RASQAL_LITERAL_STRING: rs->object = raptor_new_term_from_literal(query_results->world->raptor_world_ptr, o->string, o->datatype, (const unsigned char*)o->language); break; case RASQAL_LITERAL_QNAME: case RASQAL_LITERAL_PATTERN: case RASQAL_LITERAL_XSD_STRING: case RASQAL_LITERAL_BOOLEAN: case RASQAL_LITERAL_INTEGER: case RASQAL_LITERAL_DOUBLE: case RASQAL_LITERAL_FLOAT: case RASQAL_LITERAL_VARIABLE: case RASQAL_LITERAL_DECIMAL: case RASQAL_LITERAL_DATETIME: case RASQAL_LITERAL_UDT: case RASQAL_LITERAL_INTEGER_SUBTYPE: /* QNames should be gone by the time expression eval happens * Everything else is removed by rasqal_literal_as_node() above. */ case RASQAL_LITERAL_UNKNOWN: default: rasqal_log_error_simple(query_results->world, RAPTOR_LOG_LEVEL_WARN, &query->locator, "Triple with unknown object skipped"); skipped = 1; break; } if(skipped) { rasqal_free_literal(s); rasqal_free_literal(p); if(o) rasqal_free_literal(o); continue; } /* dispose previous triple if any */ if(query_results->triple) { rasqal_free_triple(query_results->triple); query_results->triple = NULL; } /* for saving s, p, o for later disposal */ query_results->triple = rasqal_new_triple(s, p, o); /* got triple, return it */ break; } return rs; }