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/* -*- Mode: c; c-basic-offset: 2 -*-
*
* rss2atom.c - read from a file 'file.rdf' (rdfxml) and serialize to atom
*
* Compile with:
* gcc -o rss2atom `redland-config --cflags` rss2atom.c `redland-config --libs`
*
* Copyright (C) 2008, David Beckett http://www.dajobe.org/
*
* 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 <stdlib.h>
#include <redland.h>
#define NSPACE_COUNT 3
static struct
{
const char* prefix;
const char* ns_uri;
librdf_uri* uri;
} local_nspaces[NSPACE_COUNT]= {
{ "my", "http://example.org/my-ns#" },
{ "owl", "http://www.w3.org/2002/07/owl#", },
{ "rdfs", "http://www.w3.org/2000/01/rdf-schema#" }
};
#define FEATURE_COUNT 3
static struct
{
const char* predicate;
const char* value;
} local_features[NSPACE_COUNT]= {
/* Enable atom triples output for atom */
{ "http://feature.librdf.org/raptor-rssTriples" , "atom-triples" },
/* Tell it to not write xml:base */
{ "http://feature.librdf.org/raptor-writeBaseURI", "0" },
/* This is used to generate an atom entry feed */
{ "http://feature.librdf.org/raptor-atomEntryUri", "http://example.org/2006/03/28/blog-item" }
};
int
main(int argc, char *argv[])
{
librdf_world* world;
librdf_storage* storage;
librdf_parser* parser;
librdf_model* model;
char *program;
char *p;
librdf_uri *uri;
const char *parser_name="rdfxml";
librdf_serializer* serializer;
const char* serializer_name="atom";
unsigned char *string;
size_t length;
int i;
program=argv[0];
if((p=strrchr(program, '/')))
program=p+1;
else if((p=strrchr(program, '\\')))
program=p+1;
argv[0]=program;
if(argc <2 || argc >2) {
fprintf(stderr, "USAGE: %s: <RSS RDF/XML file>\n", program);
return(1);
}
world=librdf_new_world();
librdf_world_open(world);
uri=librdf_new_uri_from_filename(world, 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);
}
parser=librdf_new_parser(world, parser_name, NULL, NULL);
if(!parser) {
fprintf(stderr, "%s: Failed to create new %s parser\n", program,
parser_name);
return(1);
}
/* PARSE the file as RDF/XML */
fprintf(stderr, "%s: Parsing file %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);
fprintf(stderr, "%s: Resulting model is %d triples\n", program,
librdf_model_size(model));
/* SERIALIZE the file as ATOM 1.0 */
serializer = librdf_new_serializer(world, serializer_name, NULL, NULL);
if(!serializer) {
fprintf(stderr, "%s: Failed to create %s serialize\n", program,
serializer_name);
return(1);
}
/* set the atom serializer namespaces */
for(i=0; i < NSPACE_COUNT; i++) {
local_nspaces[i].uri=librdf_new_uri(world, (const unsigned char*)local_nspaces[i].ns_uri);
librdf_serializer_set_namespace(serializer, local_nspaces[i].uri,
local_nspaces[i].prefix);
}
/* set the atom serializer features */
for(i=0; i < FEATURE_COUNT; i++) {
librdf_uri* predicate_uri;
librdf_node* value_node;
predicate_uri=librdf_new_uri(world,
(const unsigned char*)local_features[i].predicate);
value_node=librdf_new_node_from_literal(world, (const unsigned char*)local_features[i].value, NULL, 0);
librdf_serializer_set_feature(serializer, predicate_uri, value_node);
librdf_free_uri(predicate_uri);
librdf_free_node(value_node);
}
string=librdf_serializer_serialize_model_to_counted_string(serializer,
NULL /* librdf_uri* base_uri */,
model,
&length);
fprintf(stderr, "%s: Serialized model (%d bytes)\n", program, (int)length);
fputs((const char*)string, stdout);
free(string);
for(i=0; i < NSPACE_COUNT; i++) {
if(local_nspaces[i].uri)
librdf_free_uri(local_nspaces[i].uri);
}
librdf_free_serializer(serializer);
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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