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audacity/lib-src/redland/librdf/rdf_query_rasqal.c
ra 58caf78a86 Move library tree where it belongs
2010-01-24 09:19:39 +00:00

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/* -*- Mode: c; c-basic-offset: 2 -*-
*
* rdf_query_rasqal.c - RDF Query with Rasqal
*
* Copyright (C) 2004-2008, David Beckett http://www.dajobe.org/
* Copyright (C) 2004-2005, 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.
*
*
*/
#ifdef HAVE_CONFIG_H
#include <rdf_config.h>
#endif
#ifdef WIN32
#include <win32_rdf_config.h>
#endif
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h> /* for abort() as used in errors */
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include <redland.h>
typedef struct
{
librdf_query *query; /* librdf query object */
librdf_model *model;
rasqal_query *rq;
rasqal_query_results *results;
char *language; /* rasqal query language name to use */
unsigned char *query_string;
librdf_uri *uri; /* base URI or NULL */
int errors;
int warnings;
} librdf_query_rasqal_context;
/* prototypes for local functions */
static int rasqal_redland_init_triples_match(rasqal_triples_match* rtm, rasqal_triples_source *rts, void *user_data, rasqal_triple_meta *m, rasqal_triple *t);
static int rasqal_redland_triple_present(rasqal_triples_source *rts, void *user_data, rasqal_triple *t);
static void rasqal_redland_free_triples_source(void *user_data);
static void
librdf_query_rasqal_error_handler(void *data, raptor_locator *locator,
const char *message)
{
librdf_query* query=(librdf_query*)data;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
context->errors++;
librdf_log_simple(query->world, 0, LIBRDF_LOG_ERROR, LIBRDF_FROM_QUERY, locator, message);
}
static void
librdf_query_rasqal_warning_handler(void *data, raptor_locator *locator,
const char *message)
{
librdf_query* query=(librdf_query*)data;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
context->warnings++;
librdf_log_simple(query->world, 0, LIBRDF_LOG_WARN, LIBRDF_FROM_QUERY, locator, message);
}
/* functions implementing query api */
static int
librdf_query_rasqal_init(librdf_query* query,
const char *name, librdf_uri* uri,
const unsigned char* query_string,
librdf_uri *base_uri)
{
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
int len;
unsigned char *query_string_copy;
context->query = query;
context->language=context->query->factory->name;
context->rq=rasqal_new_query(query->world->rasqal_world_ptr, context->language, NULL);
if(!context->rq)
return 1;
rasqal_query_set_user_data(context->rq, query);
rasqal_query_set_error_handler(context->rq, query,
librdf_query_rasqal_error_handler);
rasqal_query_set_warning_handler(context->rq, query,
librdf_query_rasqal_warning_handler);
len=strlen((const char*)query_string);
query_string_copy=(unsigned char*)LIBRDF_MALLOC(cstring, len+1);
if(!query_string_copy)
return 1;
strcpy((char*)query_string_copy, (const char*)query_string);
context->query_string=query_string_copy;
if(base_uri)
context->uri=librdf_new_uri_from_uri(base_uri);
return 0;
}
static void
librdf_query_rasqal_terminate(librdf_query* query)
{
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
if(context->rq)
rasqal_free_query(context->rq);
if(context->query_string)
LIBRDF_FREE(cstring, context->query_string);
if(context->uri)
librdf_free_uri(context->uri);
}
static librdf_node*
rasqal_literal_to_redland_node(librdf_world *world, rasqal_literal* l)
{
if(!l)
return NULL;
if(l->type == RASQAL_LITERAL_URI)
return librdf_new_node_from_uri(world, (librdf_uri*)l->value.uri);
else if (l->type == RASQAL_LITERAL_STRING ||
l->type == RASQAL_LITERAL_INTEGER ||
l->type == RASQAL_LITERAL_DOUBLE ||
l->type == RASQAL_LITERAL_BOOLEAN)
return librdf_new_node_from_typed_literal(world,
(unsigned char*)l->string,
l->language,
(librdf_uri*)l->datatype);
else if (l->type == RASQAL_LITERAL_BLANK)
return librdf_new_node_from_blank_identifier(world,
(unsigned char*)l->string);
else {
LIBRDF_DEBUG2("Could not convert literal type %d to librdf_node", l->type);
abort();
}
return NULL;
}
static rasqal_literal*
redland_node_to_rasqal_literal(librdf_node *node)
{
rasqal_literal* l;
if(librdf_node_is_resource(node)) {
raptor_uri* uri=(raptor_uri*)librdf_new_uri_from_uri(librdf_node_get_uri(node));
l=rasqal_new_uri_literal(node->world->rasqal_world_ptr, uri); /* transfer uri ownership to literal */
} else if(librdf_node_is_literal(node)) {
unsigned char *string;
librdf_uri *uri;
unsigned char *new_string;
char *new_language=NULL;
raptor_uri *new_datatype=NULL;
size_t len;
string=librdf_node_get_literal_value_as_counted_string(node, &len);
new_string=(unsigned char*)rasqal_alloc_memory(len+1);
if(!new_string)
return NULL;
strcpy((char*)new_string, (const char*)string);
string=(unsigned char*)librdf_node_get_literal_value_language(node);
if(string) {
new_language=(char*)rasqal_alloc_memory(strlen((const char*)string)+1);
if(!new_language) {
rasqal_free_memory((void*)new_string);
return NULL;
}
strcpy((char*)new_language, (const char*)string);
}
uri=librdf_node_get_literal_value_datatype_uri(node);
if(uri)
new_datatype=(raptor_uri*)librdf_new_uri_from_uri(uri);
/* transfer new_string,new_language,new_datatype ownership to literal */
l=rasqal_new_string_literal(node->world->rasqal_world_ptr, (const unsigned char*)new_string, new_language, new_datatype, NULL);
} else {
unsigned char *blank=librdf_node_get_blank_identifier(node);
unsigned char *new_blank;
if(!blank)
return NULL;
new_blank=(unsigned char*)rasqal_alloc_memory(strlen((const char*)blank)+1);
if(!new_blank)
return NULL;
strcpy((char*)new_blank, (const char*)blank);
/* transfer new_blank ownership to literal */
l=rasqal_new_simple_literal(node->world->rasqal_world_ptr, RASQAL_LITERAL_BLANK, (const unsigned char*)new_blank);
}
return l;
}
typedef struct {
librdf_world *world;
librdf_query *query;
librdf_model *model;
} rasqal_redland_triples_source_user_data;
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;
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);
}
}
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;
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;
}
static int
rasqal_redland_triple_present(rasqal_triples_source *rts, void *user_data,
rasqal_triple *t)
{
rasqal_redland_triples_source_user_data* rtsc=(rasqal_redland_triples_source_user_data*)user_data;
librdf_node* nodes[3];
librdf_statement *s;
int rc;
/* ASSUMPTION: all the parts of the triple are not variables */
/* FIXME: and no error checks */
nodes[0]=rasqal_literal_to_redland_node(rtsc->world, t->subject);
nodes[1]=rasqal_literal_to_redland_node(rtsc->world, t->predicate);
nodes[2]=rasqal_literal_to_redland_node(rtsc->world, t->object);
s=librdf_new_statement_from_nodes(rtsc->world, nodes[0], nodes[1], nodes[2]);
rc=librdf_model_contains_statement(rtsc->model, s);
librdf_free_statement(s);
return rc;
}
static void
rasqal_redland_free_triples_source(void *user_data)
{
/* rasqal_redland_triples_source_user_data* rtsc=(rasqal_redland_triples_source_user_data*)user_data; */
}
static void
rasqal_redland_register_triples_source_factory(rasqal_triples_source_factory *factory)
{
factory->user_data_size=sizeof(rasqal_redland_triples_source_user_data);
factory->new_triples_source=rasqal_redland_new_triples_source;
}
typedef struct {
librdf_node* nodes[3];
librdf_node* origin;
/* query statement, made from the nodes above (even when exact) */
librdf_statement *qstatement;
librdf_stream *stream;
} rasqal_redland_triples_match_context;
static rasqal_triple_parts
rasqal_redland_bind_match(struct rasqal_triples_match_s* rtm,
void *user_data,
rasqal_variable* bindings[4],
rasqal_triple_parts parts)
{
rasqal_redland_triples_match_context* rtmc=(rasqal_redland_triples_match_context*)rtm->user_data;
rasqal_literal* l;
librdf_statement* statement;
rasqal_triple_parts result=(rasqal_triple_parts)0;
statement=librdf_stream_get_object(rtmc->stream);
if(!statement)
return (rasqal_triple_parts)0;
#ifdef RASQAL_DEBUG
LIBRDF_DEBUG1(" matched statement ");
librdf_statement_print(statement, stderr);
fputc('\n', stderr);
#endif
/* set 1 or 2 variable values from the fields of statement */
if(bindings[0] && (parts & RASQAL_TRIPLE_SUBJECT)) {
LIBRDF_DEBUG1("binding subject to variable\n");
l=redland_node_to_rasqal_literal(librdf_statement_get_subject(statement));
rasqal_variable_set_value(bindings[0], l);
result= RASQAL_TRIPLE_SUBJECT;
}
if(bindings[1] && (parts & RASQAL_TRIPLE_PREDICATE)) {
if(bindings[0] == bindings[1]) {
/* check matching(?x, ?x, ...) / subject=predicate */
if(!librdf_node_equals(librdf_statement_get_subject(statement),
librdf_statement_get_predicate(statement)))
return (rasqal_triple_parts)0;
LIBRDF_DEBUG1("subject and predicate values match\n");
} else {
LIBRDF_DEBUG1("binding predicate to variable\n");
l=redland_node_to_rasqal_literal(librdf_statement_get_predicate(statement));
rasqal_variable_set_value(bindings[1], l);
result= (rasqal_triple_parts)(result | RASQAL_TRIPLE_PREDICATE);
}
}
if(bindings[2] && (parts & RASQAL_TRIPLE_OBJECT)) {
int bind=1;
if(bindings[0] == bindings[2]) {
/* check matching (?x, ..., ?x) / subject=object */
if(!librdf_node_equals(librdf_statement_get_subject(statement),
librdf_statement_get_object(statement)))
return (rasqal_triple_parts)0;
bind=0;
LIBRDF_DEBUG1("subject and object values match\n");
}
if((bindings[1] == bindings[2]) &&
!(bindings[0] == bindings[1])) {
/* check matching (..., ?x, ?x) / predicate=object
* Don't do this if matching (?x, ?x, ...) / subject=predicate
* was already done since that would mean the match was (?x, ?x, ?x)
*/
if(!librdf_node_equals(librdf_statement_get_predicate(statement),
librdf_statement_get_object(statement)))
return (rasqal_triple_parts)0;
bind=0;
LIBRDF_DEBUG1("predicate and object values match\n");
}
if(bind) {
LIBRDF_DEBUG1("binding object to variable\n");
l=redland_node_to_rasqal_literal(librdf_statement_get_object(statement));
rasqal_variable_set_value(bindings[2], l);
result= (rasqal_triple_parts)(result | RASQAL_TRIPLE_OBJECT);
}
}
/* Contexts */
if(bindings[3] && (parts & RASQAL_TRIPLE_ORIGIN)) {
int bind=1;
librdf_node* context_node=(librdf_node*)librdf_stream_get_context(rtmc->stream);
if(bindings[0] == bindings[3]) {
/* check matching (?x, ..., ...) in context ?x */
if(!librdf_node_equals(librdf_statement_get_subject(statement),
context_node))
return (rasqal_triple_parts)0;
bind=0;
LIBRDF_DEBUG1("subject and context values match\n");
}
if(bindings[1] == bindings[3]) {
/* check matching (..., ?x, ...) in context ?x */
if(!librdf_node_equals(librdf_statement_get_predicate(statement),
context_node))
return (rasqal_triple_parts)0;
bind=0;
LIBRDF_DEBUG1("predicate and context values match\n");
}
if(bindings[2] == bindings[3]) {
/* check matching (..., ..., ?x) in context ?x */
if(!librdf_node_equals(librdf_statement_get_object(statement),
context_node))
return (rasqal_triple_parts)0;
bind=0;
LIBRDF_DEBUG1("object and context values match\n");
}
if(bind) {
LIBRDF_DEBUG1("binding origin to variable\n");
if(context_node)
l=redland_node_to_rasqal_literal(context_node);
else
l=NULL;
rasqal_variable_set_value(bindings[3], l);
result= (rasqal_triple_parts)(result | RASQAL_TRIPLE_ORIGIN);
}
}
return result;
}
static void
rasqal_redland_next_match(struct rasqal_triples_match_s* rtm,
void *user_data)
{
rasqal_redland_triples_match_context* rtmc=(rasqal_redland_triples_match_context*)rtm->user_data;
librdf_stream_next(rtmc->stream);
}
static int
rasqal_redland_is_end(struct rasqal_triples_match_s* rtm,
void *user_data)
{
rasqal_redland_triples_match_context* rtmc=(rasqal_redland_triples_match_context*)rtm->user_data;
return librdf_stream_end(rtmc->stream);
}
static void
rasqal_redland_finish_triples_match(struct rasqal_triples_match_s* rtm,
void *user_data)
{
rasqal_redland_triples_match_context* rtmc=(rasqal_redland_triples_match_context*)rtm->user_data;
if(rtmc) {
if(rtmc->stream) {
librdf_free_stream(rtmc->stream);
rtmc->stream=NULL;
}
if(rtmc->qstatement)
librdf_free_statement(rtmc->qstatement);
LIBRDF_FREE(rasqal_redland_triples_match_context, rtmc);
}
}
static int
rasqal_redland_init_triples_match(rasqal_triples_match* rtm,
rasqal_triples_source *rts, void *user_data,
rasqal_triple_meta *m, rasqal_triple *t)
{
rasqal_redland_triples_source_user_data* rtsc=(rasqal_redland_triples_source_user_data*)user_data;
rasqal_redland_triples_match_context* rtmc;
rasqal_variable* var;
rtm->bind_match=rasqal_redland_bind_match;
rtm->next_match=rasqal_redland_next_match;
rtm->is_end=rasqal_redland_is_end;
rtm->finish=rasqal_redland_finish_triples_match;
rtmc=(rasqal_redland_triples_match_context*)LIBRDF_CALLOC(rasqal_redland_triples_match_context, sizeof(rasqal_redland_triples_match_context), 1);
if(!rtmc)
return 1;
rtm->user_data=rtmc;
/* at least one of the triple terms is a variable and we need to
* do a triplesMatching() aka librdf_model_find_statements
*
* redland find_statements will do the right thing and internally
* pick the most efficient, indexed way to get the answer.
*/
if((var=rasqal_literal_as_variable(t->subject))) {
if(var->value)
rtmc->nodes[0]=rasqal_literal_to_redland_node(rtsc->world, var->value);
else
rtmc->nodes[0]=NULL;
} else
rtmc->nodes[0]=rasqal_literal_to_redland_node(rtsc->world, t->subject);
m->bindings[0]=var;
if((var=rasqal_literal_as_variable(t->predicate))) {
if(var->value)
rtmc->nodes[1]=rasqal_literal_to_redland_node(rtsc->world, var->value);
else
rtmc->nodes[1]=NULL;
} else
rtmc->nodes[1]=rasqal_literal_to_redland_node(rtsc->world, t->predicate);
m->bindings[1]=var;
if((var=rasqal_literal_as_variable(t->object))) {
if(var->value)
rtmc->nodes[2]=rasqal_literal_to_redland_node(rtsc->world, var->value);
else
rtmc->nodes[2]=NULL;
} else
rtmc->nodes[2]=rasqal_literal_to_redland_node(rtsc->world, t->object);
m->bindings[2]=var;
if(t->origin) {
if((var=rasqal_literal_as_variable(t->origin))) {
if(var->value)
rtmc->origin=rasqal_literal_to_redland_node(rtsc->world, var->value);
} else
rtmc->origin=rasqal_literal_to_redland_node(rtsc->world, t->origin);
m->bindings[3]=var;
}
rtmc->qstatement=librdf_new_statement_from_nodes(rtsc->world,
rtmc->nodes[0],
rtmc->nodes[1],
rtmc->nodes[2]);
if(!rtmc->qstatement)
return 1;
#ifdef RASQAL_DEBUG
LIBRDF_DEBUG1("query statement: ");
librdf_statement_print(rtmc->qstatement, stderr);
if(rtmc->origin) {
fput(" with context node: ", stderr);
librdf_node_print(rtmc->origin, stderr);
}
fputc('\n', stderr);
#endif
if(rtmc->origin)
rtmc->stream=librdf_model_find_statements_in_context(rtsc->model,
rtmc->qstatement,
rtmc->origin);
else
rtmc->stream=librdf_model_find_statements(rtsc->model, rtmc->qstatement);
if(!rtmc->stream)
return 1;
LIBRDF_DEBUG1("rasqal_init_triples_match done\n");
return 0;
}
static librdf_query_results*
librdf_query_rasqal_execute(librdf_query* query, librdf_model* model)
{
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
librdf_query_results* results;
context->model = model;
/* This assumes raptor's URI implementation is librdf_uri */
if(rasqal_query_prepare(context->rq, context->query_string,
(raptor_uri*)context->uri))
return NULL;
if(context->results)
rasqal_free_query_results(context->results);
context->results=rasqal_query_execute(context->rq);
if(!context->results)
return NULL;
results=(librdf_query_results*)LIBRDF_MALLOC(librdf_query_results, sizeof(librdf_query_results));
if(!results) {
rasqal_free_query_results(context->results);
context->results=NULL;
} else {
results->query=query;
}
return results;
}
static int
librdf_query_rasqal_get_limit(librdf_query* query)
{
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
return rasqal_query_get_limit(context->rq);
}
static int
librdf_query_rasqal_set_limit(librdf_query* query, int limit)
{
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
rasqal_query_set_limit(context->rq, limit);
return 0;
}
static int
librdf_query_rasqal_get_offset(librdf_query* query)
{
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
return rasqal_query_get_offset(context->rq);
}
static int
librdf_query_rasqal_set_offset(librdf_query* query, int offset)
{
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
rasqal_query_set_offset(context->rq, offset);
return 0;
}
static int
librdf_query_rasqal_results_get_count(librdf_query_results *query_results)
{
librdf_query *query=query_results->query;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
return rasqal_query_results_get_count(context->results);
}
static int
librdf_query_rasqal_results_next(librdf_query_results *query_results)
{
librdf_query *query=query_results->query;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
if(!context->results)
return 1;
return rasqal_query_results_next(context->results);
}
static int
librdf_query_rasqal_results_finished(librdf_query_results *query_results)
{
librdf_query *query=query_results->query;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
if(!context->results)
return 1;
return rasqal_query_results_finished(context->results);
}
static int
librdf_query_rasqal_results_get_bindings(librdf_query_results *query_results,
const char ***names,
librdf_node **values)
{
librdf_query *query=query_results->query;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
rasqal_literal **literals;
int rc;
int i;
if(!context->results)
return 1;
if(values) {
rc=rasqal_query_results_get_bindings(context->results, (const unsigned char ***)names, &literals);
} else
rc=rasqal_query_results_get_bindings(context->results, (const unsigned char ***)names, NULL);
if(rc || !values)
return rc;
for(i=0; i<rasqal_query_results_get_bindings_count(context->results); i++)
values[i]=rasqal_literal_to_redland_node(query->world, literals[i]);
return 0;
}
static librdf_node*
librdf_query_rasqal_results_get_binding_value(librdf_query_results *query_results, int offset)
{
librdf_query *query=query_results->query;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
rasqal_literal* literal;
literal=rasqal_query_results_get_binding_value(context->results, offset);
return rasqal_literal_to_redland_node(query->world, literal);
}
static const char*
librdf_query_rasqal_results_get_binding_name(librdf_query_results *query_results, int offset)
{
librdf_query *query=query_results->query;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
if(!context->results)
return NULL;
return (const char*)rasqal_query_results_get_binding_name(context->results, offset);
}
static librdf_node*
librdf_query_rasqal_results_get_binding_value_by_name(librdf_query_results *query_results, const char *name)
{
librdf_query *query=query_results->query;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
rasqal_literal* literal;
if(!context->results)
return NULL;
literal=rasqal_query_results_get_binding_value_by_name(context->results, (const unsigned char*)name);
return rasqal_literal_to_redland_node(query->world, literal);
}
static int
librdf_query_rasqal_results_get_bindings_count(librdf_query_results *query_results)
{
librdf_query *query=query_results->query;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
if(!context->results)
return 1;
return rasqal_query_results_get_bindings_count(context->results);
}
static void
librdf_query_rasqal_free_results(librdf_query_results* query_results)
{
librdf_query *query=query_results->query;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
if(!context->results)
return;
rasqal_free_query_results(context->results);
context->results=NULL;
}
static int
librdf_query_rasqal_results_is_bindings(librdf_query_results* query_results)
{
librdf_query *query=query_results->query;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
if(!context->results)
return 1;
return rasqal_query_results_is_bindings(context->results);
}
static int
librdf_query_rasqal_results_is_boolean(librdf_query_results* query_results)
{
librdf_query *query=query_results->query;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
if(!context->results)
return 1;
return rasqal_query_results_is_boolean(context->results);
}
static int
librdf_query_rasqal_results_is_graph(librdf_query_results* query_results)
{
librdf_query *query=query_results->query;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
if(!context->results)
return 1;
return rasqal_query_results_is_graph(context->results);
}
static int
librdf_query_rasqal_results_is_syntax(librdf_query_results* query_results)
{
librdf_query *query=query_results->query;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
if(!context->results)
return 1;
return rasqal_query_results_is_syntax(context->results);
}
static int
librdf_query_rasqal_results_get_boolean(librdf_query_results* query_results)
{
librdf_query *query=query_results->query;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
if(!context->results)
return -1;
return rasqal_query_results_get_boolean(context->results);
}
typedef struct {
librdf_query *query;
librdf_query_rasqal_context* qcontext; /* query context */
librdf_statement* statement; /* current statement */
int finished;
} librdf_query_rasqal_stream_context;
static int
librdf_query_rasqal_query_results_end_of_stream(void* context)
{
librdf_query_rasqal_stream_context* scontext=(librdf_query_rasqal_stream_context*)context;
return scontext->finished;
}
static int
librdf_query_rasqal_query_results_update_statement(void* context)
{
librdf_query_rasqal_stream_context* scontext=(librdf_query_rasqal_stream_context*)context;
librdf_world* world=scontext->query->world;
librdf_node* node;
raptor_statement *rstatement=rasqal_query_results_get_triple(scontext->qcontext->results);
if(!rstatement)
return 1;
scontext->statement=librdf_new_statement(world);
if(!scontext->statement)
return 1;
/* subject */
if(rstatement->subject_type == RAPTOR_IDENTIFIER_TYPE_ANONYMOUS) {
node=librdf_new_node_from_blank_identifier(world, (const unsigned char*)rstatement->subject);
} else if (rstatement->subject_type == RAPTOR_IDENTIFIER_TYPE_RESOURCE) {
node=librdf_new_node_from_uri_string(world,
librdf_uri_as_string((librdf_uri*)rstatement->subject));
} else {
librdf_log(world,
0, LIBRDF_LOG_ERROR, LIBRDF_FROM_QUERY, NULL,
"Unknown Raptor subject identifier type %d",
rstatement->subject_type);
goto fail;
}
if(!node) {
librdf_log(world,
0, LIBRDF_LOG_ERROR, LIBRDF_FROM_QUERY, NULL,
"Could not create subject node");
goto fail;
}
librdf_statement_set_subject(scontext->statement, node);
/* predicate */
if(rstatement->predicate_type == RAPTOR_IDENTIFIER_TYPE_ORDINAL) {
/* FIXME - but only a little
* Do I really need to do log10(ordinal) [or /10 and count] + 1 ?
* See also librdf_heuristic_gen_name for some code to repurpose.
*/
char ordinal_buffer[100];
int ordinal=*(int*)rstatement->predicate;
sprintf(ordinal_buffer, "http://www.w3.org/1999/02/22-rdf-syntax-ns#_%d", ordinal);
node=librdf_new_node_from_uri_string(world, (const unsigned char*)ordinal_buffer);
} else if (rstatement->predicate_type == RAPTOR_IDENTIFIER_TYPE_PREDICATE ||
rstatement->predicate_type == RAPTOR_IDENTIFIER_TYPE_RESOURCE) {
node=librdf_new_node_from_uri_string(world,
librdf_uri_as_string((librdf_uri*)rstatement->predicate));
} else {
librdf_log(world,
0, LIBRDF_LOG_ERROR, LIBRDF_FROM_QUERY, NULL,
"Unknown Raptor predicate identifier type %d", rstatement->predicate_type);
goto fail;
}
if(!node) {
librdf_log(world,
0, LIBRDF_LOG_ERROR, LIBRDF_FROM_QUERY, NULL,
"Could not create predicate node");
goto fail;
}
librdf_statement_set_predicate(scontext->statement, node);
/* object */
if(rstatement->object_type == RAPTOR_IDENTIFIER_TYPE_LITERAL ||
rstatement->object_type == RAPTOR_IDENTIFIER_TYPE_XML_LITERAL) {
int is_xml_literal = (rstatement->object_type == RAPTOR_IDENTIFIER_TYPE_XML_LITERAL);
librdf_uri *datatype_uri=(librdf_uri*)rstatement->object_literal_datatype;
if(is_xml_literal)
node=librdf_new_node_from_literal(world,
(const unsigned char*)rstatement->object,
(const char*)rstatement->object_literal_language,
is_xml_literal);
else
node=librdf_new_node_from_typed_literal(world,
(const unsigned char*)rstatement->object,
(const char*)rstatement->object_literal_language,
datatype_uri);
} else if(rstatement->object_type == RAPTOR_IDENTIFIER_TYPE_ANONYMOUS) {
node=librdf_new_node_from_blank_identifier(world, (const unsigned char*)rstatement->object);
} else if(rstatement->object_type == RAPTOR_IDENTIFIER_TYPE_RESOURCE) {
node=librdf_new_node_from_uri_string(world,
librdf_uri_as_string((librdf_uri*)rstatement->object));
} else {
librdf_log(world,
0, LIBRDF_LOG_ERROR, LIBRDF_FROM_PARSER, NULL,
"Unknown Raptor object identifier type %d", rstatement->object_type);
goto fail;
}
if(!node) {
librdf_log(world,
0, LIBRDF_LOG_ERROR, LIBRDF_FROM_QUERY, NULL,
"Could not create object node");
goto fail;
}
librdf_statement_set_object(scontext->statement, node);
return 0; /* success */
fail:
librdf_free_statement(scontext->statement);
scontext->statement=NULL;
return 1;
}
static int
librdf_query_rasqal_query_results_next_statement(void* context)
{
librdf_query_rasqal_stream_context* scontext=(librdf_query_rasqal_stream_context*)context;
if(scontext->finished)
return 1;
if(scontext->statement) {
librdf_free_statement(scontext->statement);
scontext->statement=NULL;
}
scontext->finished=rasqal_query_results_next_triple(scontext->qcontext->results);
if(!scontext->finished)
librdf_query_rasqal_query_results_update_statement(scontext);
return scontext->finished;
}
static void*
librdf_query_rasqal_query_results_get_statement(void* context, int flags)
{
librdf_query_rasqal_stream_context* scontext=(librdf_query_rasqal_stream_context*)context;
switch(flags) {
case LIBRDF_ITERATOR_GET_METHOD_GET_OBJECT:
return scontext->statement;
case LIBRDF_ITERATOR_GET_METHOD_GET_CONTEXT:
return NULL;
default:
librdf_log(scontext->query->world,
0, LIBRDF_LOG_ERROR, LIBRDF_FROM_QUERY, NULL,
"Unknown iterator method flag %d", flags);
return NULL;
}
}
static void
librdf_query_rasqal_query_results_finished(void* context)
{
librdf_query_rasqal_stream_context* scontext=(librdf_query_rasqal_stream_context*)context;
if(scontext) {
if(scontext->statement)
librdf_free_statement(scontext->statement);
LIBRDF_FREE(librdf_query_rasqal_context, scontext);
}
}
static librdf_stream*
librdf_query_rasqal_results_as_stream(librdf_query_results* query_results)
{
librdf_query *query=query_results->query;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
librdf_query_rasqal_stream_context* scontext;
librdf_stream *stream;
if(!context->results)
return NULL;
scontext=(librdf_query_rasqal_stream_context*)LIBRDF_CALLOC(librdf_query_rasqal_stream_context, 1, sizeof(librdf_query_rasqal_stream_context));
if(!scontext)
return NULL;
scontext->query=query;
scontext->qcontext=context;
if(librdf_query_rasqal_query_results_update_statement(scontext)) {
librdf_query_rasqal_query_results_finished((void*)scontext);
return NULL;
}
stream=librdf_new_stream(query->world,
(void*)scontext,
&librdf_query_rasqal_query_results_end_of_stream,
&librdf_query_rasqal_query_results_next_statement,
&librdf_query_rasqal_query_results_get_statement,
&librdf_query_rasqal_query_results_finished);
if(!stream) {
librdf_query_rasqal_query_results_finished((void*)scontext);
return NULL;
}
return stream;
}
static librdf_query_results_formatter*
librdf_query_rasqal_new_results_formatter(librdf_query_results* query_results,
const char *name,
librdf_uri* uri)
{
rasqal_query_results_formatter* formatter;
librdf_query_results_formatter* qrf;
formatter=rasqal_new_query_results_formatter(query_results->query->world->rasqal_world_ptr,
name, (raptor_uri*)uri);
if(!formatter)
return NULL;
qrf=(librdf_query_results_formatter*)LIBRDF_MALLOC(query_results_formatter,
sizeof(librdf_query_results_formatter));
if(!qrf) {
rasqal_free_query_results_formatter(formatter);
return NULL;
}
qrf->query_results=query_results;
qrf->formatter=formatter;
return qrf;
}
static librdf_query_results_formatter*
librdf_query_rasqal_new_results_formatter_by_mime_type(librdf_query_results* query_results,
const char *mime_type)
{
rasqal_query_results_formatter* formatter;
librdf_query_results_formatter* qrf;
formatter=rasqal_new_query_results_formatter_by_mime_type(query_results->query->world->rasqal_world_ptr,
mime_type);
if(!formatter)
return NULL;
qrf=(librdf_query_results_formatter*)LIBRDF_MALLOC(query_results_formatter,
sizeof(librdf_query_results_formatter));
if(!qrf) {
rasqal_free_query_results_formatter(formatter);
return NULL;
}
qrf->query_results=query_results;
qrf->formatter=formatter;
return qrf;
}
static void
librdf_query_rasqal_free_results_formatter(librdf_query_results_formatter* qrf)
{
rasqal_free_query_results_formatter(qrf->formatter);
LIBRDF_FREE(librdf_query_results, qrf);
}
static int
librdf_query_rasqal_results_formatter_write(raptor_iostream *iostr,
librdf_query_results_formatter* qrf,
librdf_query_results* query_results,
librdf_uri *base_uri)
{
librdf_query *query=query_results->query;
librdf_query_rasqal_context *context=(librdf_query_rasqal_context*)query->context;
return rasqal_query_results_formatter_write(iostr, qrf->formatter,
context->results,
(raptor_uri*)base_uri);
}
/* local function to register list query functions */
static void
librdf_query_rasqal_register_factory(librdf_query_factory *factory)
{
factory->context_length = sizeof(librdf_query_rasqal_context);
factory->init = librdf_query_rasqal_init;
factory->terminate = librdf_query_rasqal_terminate;
factory->execute = librdf_query_rasqal_execute;
factory->get_limit = librdf_query_rasqal_get_limit;
factory->set_limit = librdf_query_rasqal_set_limit;
factory->get_offset = librdf_query_rasqal_get_offset;
factory->set_offset = librdf_query_rasqal_set_offset;
factory->results_get_count = librdf_query_rasqal_results_get_count;
factory->results_next = librdf_query_rasqal_results_next;
factory->results_finished = librdf_query_rasqal_results_finished;
factory->results_get_bindings = librdf_query_rasqal_results_get_bindings;
factory->results_get_binding_value = librdf_query_rasqal_results_get_binding_value;
factory->results_get_binding_name = librdf_query_rasqal_results_get_binding_name;
factory->results_get_binding_value_by_name = librdf_query_rasqal_results_get_binding_value_by_name;
factory->results_get_bindings_count = librdf_query_rasqal_results_get_bindings_count;
factory->free_results = librdf_query_rasqal_free_results;
factory->results_is_bindings = librdf_query_rasqal_results_is_bindings;
factory->results_is_boolean = librdf_query_rasqal_results_is_boolean;
factory->results_is_graph = librdf_query_rasqal_results_is_graph;
factory->results_is_syntax = librdf_query_rasqal_results_is_syntax;
factory->results_get_boolean = librdf_query_rasqal_results_get_boolean;
factory->results_as_stream = librdf_query_rasqal_results_as_stream;
factory->new_results_formatter = librdf_query_rasqal_new_results_formatter;
factory->new_results_formatter_by_mime_type = librdf_query_rasqal_new_results_formatter_by_mime_type;
factory->free_results_formatter = librdf_query_rasqal_free_results_formatter;
factory->results_formatter_write = librdf_query_rasqal_results_formatter_write;
}
void
librdf_query_rasqal_constructor(librdf_world *world)
{
unsigned int i;
world->rasqal_world_ptr=rasqal_new_world();
if(!world->rasqal_world_ptr) {
LIBRDF_FATAL1(world, LIBRDF_FROM_QUERY, "failed to initialize rasqal");
return;
}
rasqal_set_triples_source_factory(world->rasqal_world_ptr, rasqal_redland_register_triples_source_factory, world);
/* enumerate from query language 1, so the default parser 0 is done last */
for(i=1; 1; i++) {
const char *language_name=NULL;
const unsigned char *uri_string=NULL;
if(rasqal_languages_enumerate(world->rasqal_world_ptr, i, &language_name, NULL, &uri_string)) {
/* reached the end of the parsers, now register the default one */
i=0;
if(rasqal_languages_enumerate(world->rasqal_world_ptr, i, &language_name, NULL, &uri_string)) {
/* error - should really return an error code or fail with librdf_fatal() */
return;
}
}
librdf_query_register_factory(world, language_name, uri_string,
&librdf_query_rasqal_register_factory);
if(!i) /* registered default query, end */
break;
}
#if 0
/* FIXME - this should be used but for now it is safe to assume
* all query is done by Rasqal
*/
/* enumerate query result formats */
for(i=0; 1; i++) {
const char *format_name=NULL;
const char *format_label=NULL;
const unsigned char *format_uri_string=NULL;
const char *format_mime_type=NULL;
if(rasqal_query_results_formats_enumerate_full(i,
&format_name,
&format_label,
&format_uri_string,
&format_mime_type))
break;
librdf_query_register_result_format(world, format_name, format_label,
format_uri_string, format_mime_type,
&librdf_query_rasqal_register_factory);
}
#endif
}
void
librdf_query_rasqal_destructor(librdf_world *world)
{
if(world->rasqal_world_ptr) {
rasqal_free_world(world->rasqal_world_ptr);
world->rasqal_world_ptr=NULL;
}
}
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