/**
* librdf_new_serializer_from_factory:
* @world: redland world object
* @factory: the serializer factory to use to create this serializer
*
* Constructor - create a new #librdf_serializer object.
*
* Return value: new #librdf_serializer object or NULL
**/
librdf_serializer*
librdf_new_serializer_from_factory(librdf_world *world,
librdf_serializer_factory *factory)
{
librdf_serializer* d;
librdf_world_open(world);
LIBRDF_ASSERT_OBJECT_POINTER_RETURN_VALUE(factory, librdf_serializer_factory, NULL);
d=(librdf_serializer*)LIBRDF_CALLOC(librdf_serializer, 1, sizeof(librdf_serializer));
if(!d)
return NULL;
d->context=(char*)LIBRDF_CALLOC(serializer_context, 1, factory->context_length);
if(!d->context) {
librdf_free_serializer(d);
return NULL;
}
d->world=world;
d->factory=factory;
if(factory->init)
if(factory->init(d, d->context)) {
librdf_free_serializer(d);
return NULL;
}
return d;
}
void RdfStorePrivate::Save(std::string filename, std::string format)
{
if (format == "") format = "turtle";
librdf_uri* baseUri = RdfUriToLibRdfUri(m_BaseUri);
librdf_serializer* s = librdf_new_serializer(m_World, format.c_str(), nullptr, nullptr);
if(!s)
{
mitkThrow() << "RDF Library Error";
}
for (PrefixMap::const_iterator i = m_Prefixes.begin(); i != m_Prefixes.end(); i++)
{
librdf_serializer_set_namespace(s, RdfUriToLibRdfUri(i->second), i->first.c_str());
}
FILE* f = fopen(filename.c_str(), "w+");
librdf_serializer_serialize_model_to_file_handle(s, f, baseUri, m_Model);
librdf_free_serializer(s);
librdf_free_uri(baseUri);
fclose(f);
}
/**
* @brief Serialize the rdf storage and return as string.
*
*
* @return The storage.
*/
unsigned char* RDF_GetRDF(void)
{
librdf_serializer* serializer;
unsigned char* result;
serializer = librdf_new_serializer(world, "rdfxml", NULL, NULL);
result = librdf_serializer_serialize_model_to_string(serializer, NULL, model);
librdf_free_serializer(serializer);
return result;
}
int
lua_bindings_redland_serializer_gc(lua_State *L) {
librdf_serializer **pp_serializer
= (librdf_serializer **) luaL_checkudata(
L
, -1
, serializer_userdata_type );
lua_pop(L, 1);
librdf_free_serializer(*pp_serializer);
return 0;
}
/*
* call-seq:
* graph.serialized_as( format, nshash={} ) -> string
*
* Return the graph serialized to a String in the specified +format+. Valid +format+s are keys
* of the Hash returned by ::serializers.
*
* The +nshash+ argument can be used to set namespaces in the output (for serializers that
* support them). It should be of the form:
*
* { :nsname => <namespace URI> }
*
* Examples:
* turtle = graph.serialized_as( 'turtle' )
* xml = graph.serialized_as( 'rdfxml-abbrev', :foaf => 'http://xmlns.com/foaf/0.1/' )
*
*/
static VALUE
rleaf_redleaf_graph_serialized_as( int argc, VALUE *argv, VALUE self ) {
rleaf_GRAPH *ptr = rleaf_get_graph( self );
librdf_serializer *serializer;
size_t length = 0;
const char *formatname;
unsigned char *serialized;
VALUE format = Qnil;
VALUE nshash = Qnil;
rb_scan_args( argc, argv, "11", &format, &nshash );
rleaf_log_with_context(
self,
"debug",
"Serializing as %s. Namespace hash is: %s",
RSTRING_PTR(rb_inspect( format )),
RSTRING_PTR(rb_inspect( nshash ))
);
formatname = StringValuePtr( format );
rleaf_log_with_context( self, "debug", "trying to serialize as '%s'", formatname );
if ( !RTEST(rb_funcall(CLASS_OF(self), valid_format_p, 1, format)) )
rb_raise( rleaf_eRedleafFeatureError, "unsupported serialization format '%s'", formatname );
rleaf_log_with_context( self, "debug", "valid format '%s' specified.", formatname );
serializer = librdf_new_serializer( rleaf_rdf_world, formatname, NULL, NULL );
if ( !serializer )
rb_raise( rleaf_eRedleafError, "could not create a '%s' serializer", formatname );
/* Set namespaces in the serializer for entries in the argshash */
if ( RTEST(nshash) )
rb_iterate( rb_each, nshash, rleaf_set_serializer_ns, (VALUE)serializer );
/* :TODO: Support for the 'baseuri' argument? */
serialized = librdf_serializer_serialize_model_to_counted_string( serializer, NULL, ptr->model, &length );
librdf_free_serializer( serializer );
if ( !serialized )
rb_raise( rleaf_eRedleafError, "could not serialize model as '%s'", formatname );
rleaf_log_with_context( self, "debug", "got %d bytes of '%s'", length, formatname );
return rb_str_new( (char *)serialized, length );
}
/**
* @brief Executes the given query and returns the result in the given format.
*
*
* @param query The query to execute.
* @param format The format of the result.
*
* @return The results.
*/
unsigned char* RDF_ExecQuery(unsigned char* query, unsigned char* format)
{
librdf_query* rdfquery;
librdf_query_results* results;
rdfquery = librdf_new_query(world, "sparql", NULL, query, NULL);
results = librdf_model_query_execute(model, rdfquery);
librdf_serializer* serializer;
librdf_stream* stream;
serializer = librdf_new_serializer(world, format, NULL, NULL);
if(!serializer)
{
fprintf(stderr,
"Failed to create triples serializer for format '%s'\n",
format);
return NULL;
}
stream = librdf_query_results_as_stream(results);
unsigned char* result = librdf_serializer_serialize_stream_to_string(serializer,
NULL, stream);
if(!result)
{
fprintf(stderr, "Failed to turn query results to format '%s'\n",
format);
return NULL;
}
librdf_free_query(rdfquery);
librdf_free_query_results(results);
librdf_free_serializer(serializer);
librdf_free_stream(stream);
return result;
}
static int
librdf_storage_file_sync(librdf_storage *storage)
{
librdf_storage_file_instance* context=(librdf_storage_file_instance*)storage->instance;
char *backup_name;
char *new_name;
librdf_serializer* serializer;
FILE *fh;
int rc=0;
if(!context->changed)
return 0;
if(!context->name) {
/* FIXME - URI cannot be written */
context->changed=0;
return 0;
}
backup_name=NULL;
if(!access((const char*)context->name, F_OK)) {
/* name"~\0" */
backup_name=(char*)LIBRDF_MALLOC(cstring, context->name_len+2);
if(!backup_name)
return 1;
strcpy(backup_name, (const char*)context->name);
backup_name[context->name_len]='~';
backup_name[context->name_len+1]='\0';
if(rename(context->name, backup_name) < 0) {
librdf_log(storage->world, 0, LIBRDF_LOG_ERROR, LIBRDF_FROM_STORAGE, NULL,
"rename of '%s' to '%s' failed - %s",
context->name, backup_name, strerror(errno));
LIBRDF_FREE(cstring, backup_name);
return 1;
}
}
/* name".new\0" */
new_name=(char*)LIBRDF_MALLOC(cstring, context->name_len+5);
if(!new_name)
return 1;
strcpy(new_name, (const char*)context->name);
strcpy(new_name+context->name_len, ".new");
serializer = librdf_new_serializer(storage->world, context->format_name,
NULL, NULL);
if(!serializer) {
LIBRDF_FREE(cstring, new_name);
if(backup_name)
LIBRDF_FREE(cstring, backup_name);
return 1;
}
fh=fopen(new_name, "w+");
if(!fh) {
librdf_log(storage->world, 0, LIBRDF_LOG_ERROR, LIBRDF_FROM_STORAGE, NULL,
"failed to open file '%s' for writing - %s",
new_name, strerror(errno));
rc=1;
} else {
librdf_serializer_serialize_model_to_file_handle(serializer, fh,
context->uri,
context->model);
fclose(fh);
}
librdf_free_serializer(serializer);
if(fh && rename(new_name, context->name) < 0) {
librdf_log(storage->world, 0, LIBRDF_LOG_ERROR, LIBRDF_FROM_STORAGE, NULL,
"rename of '%s' to '%s' failed - %s (%d)",
new_name, context->name, strerror(errno), errno);
fh=NULL;
rc=1;
}
LIBRDF_FREE(cstring, new_name);
/* restore backup on failure (fh=NULL) */
if(!fh && backup_name && rename(backup_name, context->name) < 0) {
librdf_log(storage->world, 0, LIBRDF_LOG_ERROR, LIBRDF_FROM_STORAGE, NULL,
"rename of '%s' to '%s' failed - %s",
backup_name, context->name, strerror(errno));
rc=1;
}
if(backup_name)
LIBRDF_FREE(cstring, backup_name);
context->changed=0;
return rc;
}
int
main(int argc, char *argv[])
{
const char *program=librdf_basename((const char*)argv[0]);
const char *test_serializer_types[]={"rdfxml", "ntriples", NULL};
int i;
const char *type;
unsigned char *string;
size_t string_length;
librdf_world *world;
librdf_storage *storage;
librdf_model* model;
librdf_uri* base_uri;
librdf_statement* statement;
librdf_serializer* serializer;
librdf_parser* parser;
librdf_stream* stream;
FILE *fh;
struct stat st_buf;
world=librdf_new_world();
librdf_world_open(world);
librdf_world_set_logger(world, &LogData, log_handler);
for(i=0; (type=test_serializer_types[i]); i++) {
fprintf(stderr, "%s: Trying to create new %s serializer\n", program, type);
serializer=librdf_new_serializer(world, type, NULL, NULL);
if(!serializer) {
fprintf(stderr, "%s: Failed to create new serializer type %s\n", program, type);
continue;
}
fprintf(stderr, "%s: Freeing serializer\n", program);
librdf_free_serializer(serializer);
}
storage=librdf_new_storage(world, NULL, NULL, NULL);
model=librdf_new_model(world, storage, NULL);
/* ERROR: Subject URI is bad UTF-8 */
statement=librdf_new_statement_from_nodes(world,
librdf_new_node_from_uri_string(world, (const unsigned char*)"http://example.org/foo\xfc"),
librdf_new_node_from_uri_string(world, (const unsigned char*)"http://example.org/bar"),
librdf_new_node_from_literal(world, (const unsigned char*)"blah", NULL, 0));
librdf_model_add_statement(model, statement);
librdf_free_statement(statement);
/* ERROR: Predicate URI is not serializable */
statement=librdf_new_statement_from_nodes(world,
librdf_new_node_from_uri_string(world, (const unsigned char*)"http://example.org/foo"),
librdf_new_node_from_uri_string(world, (const unsigned char*)"http://bad.example.org/"),
librdf_new_node_from_literal(world, (const unsigned char*)"blah", NULL, 0));
librdf_model_add_statement(model, statement);
librdf_free_statement(statement);
/* ERROR: Object literal is bad UTF-8 */
statement=librdf_new_statement_from_nodes(world,
librdf_new_node_from_uri_string(world, (const unsigned char*)"http://example.org/foo"),
librdf_new_node_from_uri_string(world, (const unsigned char*)"http://example.org/abc"),
librdf_new_node_from_literal(world, (const unsigned char*)"\xfc", NULL, 0));
librdf_model_add_statement(model, statement);
librdf_free_statement(statement);
serializer=librdf_new_serializer(world, "rdfxml", NULL, NULL);
base_uri=librdf_new_uri(world, (const unsigned char*)"http://example.org/base#");
string=librdf_serializer_serialize_model_to_counted_string(serializer,
base_uri, model,
&string_length);
#define EXPECTED_BAD_STRING_LENGTH 382
if(string_length != EXPECTED_BAD_STRING_LENGTH) {
fprintf(stderr, "%s: Serialising model to RDF/XML returned string '%s' size %d, expected %d\n", program, string,
(int)string_length, EXPECTED_BAD_STRING_LENGTH);
return 1;
}
if(string)
free(string);
librdf_free_uri(base_uri); base_uri=NULL;
librdf_free_model(model); model=NULL;
librdf_free_storage(storage); storage=NULL;
if(LogData.errors != EXPECTED_ERRORS) {
fprintf(stderr, "%s: Serialising to RDF/XML returned %d errors, expected %d\n", program,
LogData.errors, EXPECTED_ERRORS);
return 1;
}
if(LogData.warnings != EXPECTED_WARNINGS) {
fprintf(stderr, "%s: Serialising to RDF/XML returned %d warnings, expected %d\n", program,
LogData.warnings, EXPECTED_WARNINGS);
return 1;
}
/* Good model to serialize */
storage=librdf_new_storage(world, NULL, NULL, NULL);
model=librdf_new_model(world, storage, NULL);
parser=librdf_new_parser(world, SYNTAX_TYPE, NULL, NULL);
if(!parser) {
fprintf(stderr, "%s: Failed to create new parser type %s\n", program,
SYNTAX_TYPE);
return 1;
}
fprintf(stderr, "%s: Adding %s string content\n", program, SYNTAX_TYPE);
if(librdf_parser_parse_string_into_model(parser,
(const unsigned char*)SYNTAX_CONTENT,
NULL /* no base URI*/,
model)) {
fprintf(stderr, "%s: Failed to parse RDF from %s string into model\n",
SYNTAX_TYPE, program);
return 1;
}
librdf_free_parser(parser);
fprintf(stderr, "%s: Serializing stream to a string\n", program);
stream=librdf_model_as_stream(model);
string_length=0;
string=librdf_serializer_serialize_stream_to_counted_string(serializer,
NULL, stream,
&string_length);
#define EXPECTED_GOOD_STRING_LENGTH 668
if(string_length != EXPECTED_GOOD_STRING_LENGTH) {
fprintf(stderr, "%s: Serialising stream to RDF/XML returned string '%s' size %d, expected %d\n", program, string,
(int)string_length, EXPECTED_GOOD_STRING_LENGTH);
return 1;
}
librdf_free_stream(stream);
if(string)
free(string);
fprintf(stderr, "%s: Serializing stream to a file handle\n", program);
stream=librdf_model_as_stream(model);
#define FILENAME "test.rdf"
fh=fopen(FILENAME, "w");
if(!fh) {
fprintf(stderr, "%s: Failed to fopen for writing '%s' - %s\n",
program, FILENAME, strerror(errno));
return 1;
}
librdf_serializer_serialize_stream_to_file_handle(serializer, fh, NULL,
stream);
fclose(fh);
stat(FILENAME, &st_buf);
if((int)st_buf.st_size != EXPECTED_GOOD_STRING_LENGTH) {
fprintf(stderr, "%s: Serialising stream to file handle returned file '%s' of size %d bytes, expected %d\n", program, FILENAME, (int)st_buf.st_size,
EXPECTED_GOOD_STRING_LENGTH);
return 1;
}
unlink(FILENAME);
librdf_free_stream(stream);
librdf_free_serializer(serializer); serializer=NULL;
librdf_free_model(model); model=NULL;
librdf_free_storage(storage); storage=NULL;
librdf_free_world(world);
/* keep gcc -Wall happy */
return(0);
}
void run_query(librdf_world* world, librdf_model* model, const std::string& q)
{
librdf_stream* strm;
std::cout << "** Query: " << q << std::endl;
librdf_uri* uri1 =
librdf_new_uri(world, (const unsigned char*) "http://bunchy.org");
if (uri1 == 0)
throw std::runtime_error("Couldn't parse URI");
librdf_uri* uri2 =
librdf_new_uri(world, (const unsigned char*) "http://bunchy.org");
if (uri2 == 0)
throw std::runtime_error("Couldn't parse URI");
librdf_query* qry =
librdf_new_query(world, "sparql", uri1,
(const unsigned char*) q.c_str(),
uri2);
librdf_free_uri(uri1);
librdf_free_uri(uri2);
if (qry == 0)
throw std::runtime_error("Couldn't parse query.");
librdf_query_results* results = librdf_query_execute(qry, model);
if (results == 0)
throw std::runtime_error("Couldn't execute query");
librdf_free_query(qry);
strm = librdf_query_results_as_stream(results);
if (strm == 0)
throw std::runtime_error("Couldn't stream results");
librdf_serializer* srl = librdf_new_serializer(world, "ntriples",
0, 0);
if (srl == 0)
throw std::runtime_error("Couldn't create serialiser");
size_t len;
unsigned char* out =
librdf_serializer_serialize_stream_to_counted_string(srl, 0,
strm, &len);
std::cout << "--------------------------------------------------------"
<< std::endl;
write(1, out, len);
std::cout << "--------------------------------------------------------"
<< std::endl;
free(out);
librdf_free_serializer(srl);
librdf_free_stream(strm);
librdf_free_query_results(results);
}
int main(int argc, char** argv)
{
try {
/*********************************************************************/
/* Initialise */
/*********************************************************************/
std::cout << "** Initialise" << std::endl;
librdf_world* world = librdf_new_world();
if (world == 0)
throw std::runtime_error("Didn't get world");
librdf_storage* storage =
librdf_new_storage(world, STORE, STORE_NAME, "new='yes'");
if (storage == 0)
throw std::runtime_error("Didn't get storage");
librdf_model* model =
librdf_new_model(world, storage, 0);
if (model == 0)
throw std::runtime_error("Couldn't construct model");
/*********************************************************************/
/* Create in-memory model */
/*********************************************************************/
std::cout << "** Create in-memory model" << std::endl;
librdf_storage* mstorage =
librdf_new_storage(world, "memory", 0, 0);
if (storage == 0)
throw std::runtime_error("Didn't get storage");
librdf_model* mmodel =
librdf_new_model(world, mstorage, 0);
if (model == 0)
throw std::runtime_error("Couldn't construct model");
for(int i = 0; i < 10; i++) {
char sbuf[256];
char obuf[256];
sprintf(sbuf, "http://gaffer.test/number#%d", i);
sprintf(obuf, "http://gaffer.test/number#%d", i+1);
librdf_node *s =
librdf_new_node_from_uri_string(world,
(const unsigned char *) sbuf);
librdf_node *p =
librdf_new_node_from_uri_string(world,
(const unsigned char *)
"http://gaffer.test/number#is_before");
librdf_node *o =
librdf_new_node_from_uri_string(world,
(const unsigned char*) obuf);
librdf_statement* st = librdf_new_statement_from_nodes(world,
s, p, o);
librdf_model_add_statement(mmodel, st);
librdf_free_statement(st);
}
/*********************************************************************/
/* Size */
/*********************************************************************/
std::cout << "** Model size is " << librdf_model_size(model)
<< std::endl;
/*********************************************************************/
/* Add statement */
/*********************************************************************/
std::cout << "** Add statement" << std::endl;
const char* fred = "http://gaffer.test/#fred";
const char* is_a = "http://gaffer.test/#is_a";
const char* cat = "http://gaffer.test/#cat";
librdf_node *s =
librdf_new_node_from_uri_string(world,
(const unsigned char *) fred);
librdf_node *p =
librdf_new_node_from_uri_string(world,
(const unsigned char *) is_a);
librdf_node *o =
librdf_new_node_from_uri_string(world,
(const unsigned char *) cat);
librdf_statement* st = librdf_new_statement_from_nodes(world, s, p, o);
librdf_model_add_statement(model, st);
/*********************************************************************/
/* Add memory model statements */
/*********************************************************************/
std::cout << "** Add statements" << std::endl;
librdf_stream* strm = librdf_model_as_stream(mmodel);
if (strm == 0)
throw std::runtime_error("Couldn't get memory stream");
int ret = librdf_model_add_statements(model, strm);
if (ret != 0)
throw std::runtime_error("Couldn't add_statements");
librdf_free_stream(strm);
librdf_free_model(mmodel);
librdf_free_storage(mstorage);
/*********************************************************************/
/* Run queries */
/*********************************************************************/
run_query(world, model, query_string8);
run_query(world, model, query_string1);
run_query(world, model, query_string2);
run_query(world, model, query_string3);
run_query(world, model, query_string4);
run_query(world, model, query_string5);
run_query(world, model, query_string6);
run_query2(world, model, query_string7);
/*********************************************************************/
/* Remove statement */
/*********************************************************************/
std::cout << "** Remove statements" << std::endl;
librdf_model_remove_statement(model, st);
/*********************************************************************/
/* Serialise */
/*********************************************************************/
std::cout << "** Serialise" << std::endl;
strm = librdf_model_as_stream(model);
if (strm == 0)
throw std::runtime_error("Couldn't get model as stream");
librdf_serializer* srl = librdf_new_serializer(world, "ntriples",
0, 0);
if (srl == 0)
throw std::runtime_error("Couldn't create serialiser");
size_t len;
unsigned char* out =
librdf_serializer_serialize_stream_to_counted_string(srl, 0,
strm, &len);
std::cout << "--------------------------------------------------------"
<< std::endl;
write(1, out, len);
std::cout << "--------------------------------------------------------"
<< std::endl;
free(out);
librdf_free_stream(strm);
librdf_free_serializer(srl);
/*********************************************************************/
/* Cleanup */
/*********************************************************************/
librdf_free_statement(st);
librdf_free_model(model);
librdf_free_storage(storage);
librdf_free_world(world);
} catch (std::exception& e) {
std::cerr << e.what() << std::endl;
}
}
int
print_query_results(librdf_world* world, librdf_model* model, librdf_query_results *results)
{
int i;
char *name;
librdf_stream* stream;
librdf_serializer* serializer;
const char *query_graph_serializer_syntax_name="rdfxml";
if(librdf_query_results_is_bindings(results)) {
fprintf(stdout, ": Query returned bindings results:\n");
while(!librdf_query_results_finished(results)) {
fputs("result: [", stdout);
for(i=0; i<librdf_query_results_get_bindings_count(results); i++) {
librdf_node *value=librdf_query_results_get_binding_value(results, i);
name=(char*)librdf_query_results_get_binding_name(results, i);
if(i>0)
fputs(", ", stdout);
fprintf(stdout, "%s=", name);
if(value) {
librdf_node_print(value, stdout);
librdf_free_node(value);
} else
fputs("NULL", stdout);
}
fputs("]\n", stdout);
librdf_query_results_next(results);
}
fprintf(stdout, ": Query returned %d results\n", librdf_query_results_get_count(results));
} else if(librdf_query_results_is_boolean(results)) {
fprintf(stdout, ": Query returned boolean result: %s\n", librdf_query_results_get_boolean(results) ? "true" : "false");
} else if(librdf_query_results_is_graph(results)) {
librdf_storage* tmp_storage;
librdf_model* tmp_model;
tmp_storage=librdf_new_storage(world, NULL, NULL, NULL);
tmp_model=librdf_new_model(world, tmp_storage, NULL);
fprintf(stdout, ": Query returned graph result:\n");
stream=librdf_query_results_as_stream(results);
if(!stream) {
fprintf(stderr, ": Failed to get query results graph\n");
return -1;
}
librdf_model_add_statements(tmp_model, stream);
librdf_free_stream(stream);
fprintf(stdout, ": Total %d triples\n", librdf_model_size(model));
serializer=librdf_new_serializer(world, query_graph_serializer_syntax_name, NULL, NULL);
if(!serializer) {
fprintf(stderr, ": Failed to create serializer type %s\n", query_graph_serializer_syntax_name);
return -1;
}
librdf_serializer_serialize_model_to_file_handle(serializer, stdout, NULL, tmp_model);
librdf_free_serializer(serializer);
librdf_free_model(tmp_model);
librdf_free_storage(tmp_storage);
} else {
fprintf(stdout, ": Query returned unknown result format\n");
return -1;
}
return 0;
}
