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/* -*- Mode: c; c-basic-offset: 2 -*-
*
* example.c - Redland example parsing RDF from a URI, storing on disk as BDB hashes and querying the results
*
* Copyright (C) 2000-2008, David Beckett http://www.dajobe.org/
* Copyright (C) 2000-2004, 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.
*
*
*/
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <redland.h>
/* one prototype needed */
int main(int argc, char *argv[]);
int
main(int argc, char *argv[])
{
librdf_world* world;
librdf_storage* storage;
librdf_parser* parser;
librdf_model* model;
librdf_stream* stream;
librdf_node *subject, *predicate;
librdf_iterator* iterator;
librdf_statement *partial_statement, *statement2;
char *program=argv[0];
librdf_uri *uri;
char *parser_name=NULL;
int count;
raptor_world *raptor_world_ptr;
raptor_iostream* iostr;
if(argc <2 || argc >3) {
fprintf(stderr, "USAGE: %s: <RDF source URI> [rdf parser name]\n", program);
return(1);
}
world = librdf_new_world();
librdf_world_open(world);
raptor_world_ptr = librdf_world_get_raptor(world);
uri=librdf_new_uri(world, (const unsigned char*)argv[1]);
if(!uri) {
fprintf(stderr, "%s: Failed to create URI\n", program);
return(1);
}
storage=librdf_new_storage(world, "memory", "test", NULL);
if(!storage) {
fprintf(stderr, "%s: Failed to create new storage\n", program);
return(1);
}
model=librdf_new_model(world, storage, NULL);
if(!model) {
fprintf(stderr, "%s: Failed to create model\n", program);
return(1);
}
if(argc==3)
parser_name=argv[2];
parser=librdf_new_parser(world, parser_name, NULL, NULL);
if(!parser) {
fprintf(stderr, "%s: Failed to create new parser\n", program);
return(1);
}
/* PARSE the URI as RDF/XML*/
fprintf(stdout, "%s: Parsing URI %s\n", program, librdf_uri_as_string(uri));
if(librdf_parser_parse_into_model(parser, uri, uri, model)) {
fprintf(stderr, "%s: Failed to parse RDF into model\n", program);
return(1);
}
librdf_free_parser(parser);
statement2=librdf_new_statement_from_nodes(world, librdf_new_node_from_uri_string(world, (const unsigned char*)"http://www.dajobe.org/"),
librdf_new_node_from_uri_string(world, (const unsigned char*)"http://purl.org/dc/elements/1.1/title"),
librdf_new_node_from_literal(world, (const unsigned char*)"My Home Page", NULL, 0)
);
librdf_model_add_statement(model, statement2);
/* Free what we just used to add to the model - now it should be stored */
librdf_free_statement(statement2);
/* Print out the model*/
fprintf(stdout, "%s: Resulting model is:\n", program);
iostr = raptor_new_iostream_to_file_handle(raptor_world_ptr, stdout);
librdf_model_write(model, iostr);
raptor_free_iostream(iostr);
/* Construct the query predicate (arc) and object (target)
* and partial statement bits
*/
subject=librdf_new_node_from_uri_string(world, (const unsigned char*)"http://www.dajobe.org/");
predicate=librdf_new_node_from_uri_string(world, (const unsigned char*)"http://purl.org/dc/elements/1.1/title");
if(!subject || !predicate) {
fprintf(stderr, "%s: Failed to create nodes for searching\n", program);
return(1);
}
partial_statement=librdf_new_statement(world);
librdf_statement_set_subject(partial_statement, subject);
librdf_statement_set_predicate(partial_statement, predicate);
/* QUERY TEST 1 - use find_statements to match */
fprintf(stdout, "%s: Trying to find_statements\n", program);
stream=librdf_model_find_statements(model, partial_statement);
if(!stream) {
fprintf(stderr, "%s: librdf_model_find_statements returned NULL stream\n", program);
} else {
count=0;
while(!librdf_stream_end(stream)) {
librdf_statement *statement=librdf_stream_get_object(stream);
if(!statement) {
fprintf(stderr, "%s: librdf_stream_next returned NULL\n", program);
break;
}
fputs(" Matched statement: ", stdout);
librdf_statement_print(statement, stdout);
fputc('\n', stdout);
librdf_stream_next(stream);
count++;
}
librdf_free_stream(stream);
fprintf(stderr, "%s: got %d matching statements\n", program, count);
}
/* QUERY TEST 2 - use get_targets to do match */
fprintf(stdout, "%s: Trying to get targets\n", program);
iterator=librdf_model_get_targets(model, subject, predicate);
if(!iterator) {
fprintf(stderr, "%s: librdf_model_get_targets failed to return iterator for searching\n", program);
return(1);
}
count=0;
while(!librdf_iterator_end(iterator)) {
librdf_node *target;
target=(librdf_node*)librdf_iterator_get_object(iterator);
if(!target) {
fprintf(stderr, "%s: librdf_iterator_get_object returned NULL\n", program);
break;
}
fputs(" Matched target: ", stdout);
librdf_node_print(target, stdout);
fputc('\n', stdout);
count++;
librdf_iterator_next(iterator);
}
librdf_free_iterator(iterator);
fprintf(stderr, "%s: got %d target nodes\n", program, count);
librdf_free_statement(partial_statement);
/* the above does this since they are still attached */
/* librdf_free_node(predicate); */
/* librdf_free_node(object); */
librdf_free_model(model);
librdf_free_storage(storage);
librdf_free_uri(uri);
librdf_free_world(world);
#ifdef LIBRDF_MEMORY_DEBUG
librdf_memory_report(stderr);
#endif
/* keep gcc -Wall happy */
return(0);
}
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