mirror of
https://github.com/cookiengineer/audacity
synced 2025-11-04 08:04:06 +01:00
377 lines
11 KiB
C
377 lines
11 KiB
C
/* -*- Mode: c; c-basic-offset: 2 -*-
|
|
*
|
|
* rdf_storage_file.c - RDF Storage in a file, using an in-memory store
|
|
*
|
|
* Copyright (C) 2004-2008, David Beckett http://www.dajobe.org/
|
|
* Copyright (C) 2004-2004, 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.
|
|
*
|
|
*
|
|
*/
|
|
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <rdf_config.h>
|
|
#endif
|
|
|
|
#ifdef WIN32
|
|
#include <win32_rdf_config.h>
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#ifdef HAVE_STDLIB_H
|
|
#include <stdlib.h> /* for abort() as used in errors */
|
|
#endif
|
|
#ifdef HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
#ifdef HAVE_ERRNO_H
|
|
#include <errno.h>
|
|
#endif
|
|
#include <sys/types.h>
|
|
|
|
#include <redland.h>
|
|
|
|
|
|
typedef struct
|
|
{
|
|
librdf_model* model;
|
|
librdf_storage* storage;
|
|
int changed;
|
|
|
|
/* 'uri' factory only */
|
|
librdf_uri* uri;
|
|
/* 'name' factory only */
|
|
size_t name_len;
|
|
char *name;
|
|
} librdf_storage_file_context;
|
|
|
|
|
|
/* prototypes for local functions */
|
|
static int librdf_storage_file_init(librdf_storage* storage, const char *name, librdf_hash* options);
|
|
static int librdf_storage_file_open(librdf_storage* storage, librdf_model* model);
|
|
static int librdf_storage_file_close(librdf_storage* storage);
|
|
static int librdf_storage_file_size(librdf_storage* storage);
|
|
static int librdf_storage_file_add_statement(librdf_storage* storage, librdf_statement* statement);
|
|
static int librdf_storage_file_add_statements(librdf_storage* storage, librdf_stream* statement_stream);
|
|
static int librdf_storage_file_remove_statement(librdf_storage* storage, librdf_statement* statement);
|
|
static int librdf_storage_file_contains_statement(librdf_storage* storage, librdf_statement* statement);
|
|
static librdf_stream* librdf_storage_file_serialise(librdf_storage* storage);
|
|
static librdf_stream* librdf_storage_file_find_statements(librdf_storage* storage, librdf_statement* statement);
|
|
|
|
static int librdf_storage_file_sync(librdf_storage *storage);
|
|
|
|
static void librdf_storage_file_register_factory(librdf_storage_factory *factory);
|
|
|
|
|
|
|
|
/* functions implementing storage api */
|
|
static int
|
|
librdf_storage_file_init(librdf_storage* storage, const char *name,
|
|
librdf_hash* options)
|
|
{
|
|
librdf_storage_file_context *context=(librdf_storage_file_context*)storage->context;
|
|
char *name_copy;
|
|
char *contexts;
|
|
int rc=1;
|
|
|
|
int is_uri=!strcmp(storage->factory->name, "uri");
|
|
|
|
/* Cannot save contexts in a file; pass everything else on */
|
|
contexts=librdf_hash_get_del(options, "contexts");
|
|
if(contexts)
|
|
LIBRDF_FREE(cstring, contexts);
|
|
|
|
if(is_uri)
|
|
context->uri=librdf_new_uri(storage->world, (const unsigned char*)name);
|
|
else {
|
|
context->name_len=strlen(name);
|
|
name_copy=(char*)LIBRDF_MALLOC(cstring, context->name_len+1);
|
|
if(!name_copy)
|
|
goto done;
|
|
strcpy(name_copy,name);
|
|
context->name=name_copy;
|
|
context->uri=librdf_new_uri_from_filename(storage->world, context->name);
|
|
}
|
|
|
|
context->storage=librdf_new_storage_with_options(storage->world,
|
|
NULL, NULL,
|
|
options);
|
|
if(!context->storage)
|
|
goto done;
|
|
|
|
context->model=librdf_new_model(storage->world, context->storage, NULL);
|
|
if(!context->model)
|
|
goto done;
|
|
|
|
if(is_uri || !access((const char*)context->name, F_OK)) {
|
|
librdf_parser* parser;
|
|
|
|
parser=librdf_new_parser(storage->world, "rdfxml", NULL, NULL);
|
|
librdf_parser_parse_into_model(parser, context->uri, NULL, context->model);
|
|
librdf_free_parser(parser);
|
|
}
|
|
|
|
context->changed=0;
|
|
|
|
rc=0;
|
|
|
|
done:
|
|
|
|
/* no more options, might as well free them now */
|
|
if(options)
|
|
librdf_free_hash(options);
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
static void
|
|
librdf_storage_file_terminate(librdf_storage* storage)
|
|
{
|
|
librdf_storage_file_context *context=(librdf_storage_file_context*)storage->context;
|
|
|
|
librdf_storage_file_sync(storage);
|
|
|
|
if(context->name)
|
|
LIBRDF_FREE(cstring, context->name);
|
|
|
|
if(context->uri)
|
|
librdf_free_uri(context->uri);
|
|
|
|
if(context->model)
|
|
librdf_free_model(context->model);
|
|
|
|
if(context->storage)
|
|
librdf_free_storage(context->storage);
|
|
}
|
|
|
|
|
|
static int
|
|
librdf_storage_file_open(librdf_storage* storage, librdf_model* model)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
librdf_storage_file_close(librdf_storage* storage)
|
|
{
|
|
return librdf_storage_file_sync(storage);
|
|
}
|
|
|
|
|
|
static int
|
|
librdf_storage_file_size(librdf_storage* storage)
|
|
{
|
|
librdf_storage_file_context* context=(librdf_storage_file_context*)storage->context;
|
|
return librdf_model_size(context->model);
|
|
}
|
|
|
|
|
|
static int
|
|
librdf_storage_file_add_statement(librdf_storage* storage, librdf_statement* statement)
|
|
{
|
|
librdf_storage_file_context* context=(librdf_storage_file_context*)storage->context;
|
|
context->changed=1;
|
|
return librdf_model_add_statement(context->model, statement);
|
|
}
|
|
|
|
|
|
static int
|
|
librdf_storage_file_add_statements(librdf_storage* storage,
|
|
librdf_stream* statement_stream)
|
|
{
|
|
librdf_storage_file_context* context=(librdf_storage_file_context*)storage->context;
|
|
context->changed=1;
|
|
return librdf_model_add_statements(context->model, statement_stream);
|
|
}
|
|
|
|
|
|
static int
|
|
librdf_storage_file_remove_statement(librdf_storage* storage, librdf_statement* statement)
|
|
{
|
|
librdf_storage_file_context* context=(librdf_storage_file_context*)storage->context;
|
|
context->changed=1;
|
|
return librdf_model_remove_statement(context->model, statement);
|
|
}
|
|
|
|
|
|
static int
|
|
librdf_storage_file_contains_statement(librdf_storage* storage, librdf_statement* statement)
|
|
{
|
|
librdf_storage_file_context* context=(librdf_storage_file_context*)storage->context;
|
|
return librdf_model_contains_statement(context->model, statement);
|
|
}
|
|
|
|
|
|
static librdf_stream*
|
|
librdf_storage_file_serialise(librdf_storage* storage)
|
|
{
|
|
librdf_storage_file_context* context=(librdf_storage_file_context*)storage->context;
|
|
return librdf_model_as_stream(context->model);
|
|
}
|
|
|
|
|
|
static librdf_stream*
|
|
librdf_storage_file_find_statements(librdf_storage* storage, librdf_statement* statement)
|
|
{
|
|
librdf_storage_file_context* context=(librdf_storage_file_context*)storage->context;
|
|
return librdf_model_find_statements(context->model, statement);
|
|
}
|
|
|
|
|
|
static int
|
|
librdf_storage_file_sync(librdf_storage *storage)
|
|
{
|
|
librdf_storage_file_context* context=(librdf_storage_file_context*)storage->context;
|
|
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, "rdfxml", 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;
|
|
}
|
|
|
|
|
|
static librdf_node*
|
|
librdf_storage_file_get_feature(librdf_storage* storage, librdf_uri* feature)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/* local function to register list storage functions */
|
|
|
|
static void
|
|
librdf_storage_file_register_factory(librdf_storage_factory *factory)
|
|
{
|
|
factory->context_length = sizeof(librdf_storage_file_context);
|
|
|
|
factory->init = librdf_storage_file_init;
|
|
factory->terminate = librdf_storage_file_terminate;
|
|
factory->open = librdf_storage_file_open;
|
|
factory->close = librdf_storage_file_close;
|
|
factory->size = librdf_storage_file_size;
|
|
factory->add_statement = librdf_storage_file_add_statement;
|
|
factory->add_statements = librdf_storage_file_add_statements;
|
|
factory->remove_statement = librdf_storage_file_remove_statement;
|
|
factory->contains_statement = librdf_storage_file_contains_statement;
|
|
factory->serialise = librdf_storage_file_serialise;
|
|
factory->find_statements = librdf_storage_file_find_statements;
|
|
factory->sync = librdf_storage_file_sync;
|
|
factory->get_feature = librdf_storage_file_get_feature;
|
|
}
|
|
|
|
|
|
/**
|
|
* librdf_init_storage_file:
|
|
* @world: world object
|
|
*
|
|
* INTERNAL - initialise the storage_file module.
|
|
**/
|
|
void
|
|
librdf_init_storage_file(librdf_world *world)
|
|
{
|
|
librdf_storage_register_factory(world, "file", "Local file based store",
|
|
&librdf_storage_file_register_factory);
|
|
librdf_storage_register_factory(world, "uri", "URI store (read-only)",
|
|
&librdf_storage_file_register_factory);
|
|
}
|