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Move library tree where it belongs
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ra
376
lib-src/redland/librdf/rdf_storage_file.c
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376
lib-src/redland/librdf/rdf_storage_file.c
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/* -*- Mode: c; c-basic-offset: 2 -*-
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*
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* rdf_storage_file.c - RDF Storage in a file, using an in-memory store
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*
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* Copyright (C) 2004-2008, David Beckett http://www.dajobe.org/
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* Copyright (C) 2004-2004, University of Bristol, UK http://www.bristol.ac.uk/
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*
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* This package is Free Software and part of Redland http://librdf.org/
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*
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* It is licensed under the following three licenses as alternatives:
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* 1. GNU Lesser General Public License (LGPL) V2.1 or any newer version
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* 2. GNU General Public License (GPL) V2 or any newer version
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* 3. Apache License, V2.0 or any newer version
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*
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* You may not use this file except in compliance with at least one of
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* the above three licenses.
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*
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* See LICENSE.html or LICENSE.txt at the top of this package for the
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* complete terms and further detail along with the license texts for
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* the licenses in COPYING.LIB, COPYING and LICENSE-2.0.txt respectively.
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*
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <rdf_config.h>
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#endif
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#ifdef WIN32
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#include <win32_rdf_config.h>
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#endif
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#include <stdio.h>
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#include <string.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h> /* for abort() as used in errors */
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include <sys/types.h>
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#include <redland.h>
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typedef struct
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{
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librdf_model* model;
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librdf_storage* storage;
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int changed;
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/* 'uri' factory only */
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librdf_uri* uri;
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/* 'name' factory only */
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size_t name_len;
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char *name;
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} librdf_storage_file_context;
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/* prototypes for local functions */
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static int librdf_storage_file_init(librdf_storage* storage, const char *name, librdf_hash* options);
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static int librdf_storage_file_open(librdf_storage* storage, librdf_model* model);
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static int librdf_storage_file_close(librdf_storage* storage);
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static int librdf_storage_file_size(librdf_storage* storage);
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static int librdf_storage_file_add_statement(librdf_storage* storage, librdf_statement* statement);
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static int librdf_storage_file_add_statements(librdf_storage* storage, librdf_stream* statement_stream);
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static int librdf_storage_file_remove_statement(librdf_storage* storage, librdf_statement* statement);
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static int librdf_storage_file_contains_statement(librdf_storage* storage, librdf_statement* statement);
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static librdf_stream* librdf_storage_file_serialise(librdf_storage* storage);
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static librdf_stream* librdf_storage_file_find_statements(librdf_storage* storage, librdf_statement* statement);
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static int librdf_storage_file_sync(librdf_storage *storage);
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static void librdf_storage_file_register_factory(librdf_storage_factory *factory);
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/* functions implementing storage api */
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static int
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librdf_storage_file_init(librdf_storage* storage, const char *name,
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librdf_hash* options)
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{
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librdf_storage_file_context *context=(librdf_storage_file_context*)storage->context;
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char *name_copy;
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char *contexts;
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int rc=1;
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int is_uri=!strcmp(storage->factory->name, "uri");
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/* Cannot save contexts in a file; pass everything else on */
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contexts=librdf_hash_get_del(options, "contexts");
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if(contexts)
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LIBRDF_FREE(cstring, contexts);
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if(is_uri)
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context->uri=librdf_new_uri(storage->world, (const unsigned char*)name);
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else {
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context->name_len=strlen(name);
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name_copy=(char*)LIBRDF_MALLOC(cstring, context->name_len+1);
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if(!name_copy)
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goto done;
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strcpy(name_copy,name);
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context->name=name_copy;
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context->uri=librdf_new_uri_from_filename(storage->world, context->name);
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}
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context->storage=librdf_new_storage_with_options(storage->world,
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NULL, NULL,
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options);
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if(!context->storage)
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goto done;
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context->model=librdf_new_model(storage->world, context->storage, NULL);
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if(!context->model)
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goto done;
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if(is_uri || !access((const char*)context->name, F_OK)) {
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librdf_parser* parser;
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parser=librdf_new_parser(storage->world, "rdfxml", NULL, NULL);
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librdf_parser_parse_into_model(parser, context->uri, NULL, context->model);
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librdf_free_parser(parser);
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}
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context->changed=0;
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rc=0;
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done:
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/* no more options, might as well free them now */
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if(options)
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librdf_free_hash(options);
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return rc;
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}
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static void
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librdf_storage_file_terminate(librdf_storage* storage)
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{
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librdf_storage_file_context *context=(librdf_storage_file_context*)storage->context;
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librdf_storage_file_sync(storage);
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if(context->name)
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LIBRDF_FREE(cstring, context->name);
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if(context->uri)
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librdf_free_uri(context->uri);
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if(context->model)
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librdf_free_model(context->model);
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if(context->storage)
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librdf_free_storage(context->storage);
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}
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static int
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librdf_storage_file_open(librdf_storage* storage, librdf_model* model)
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{
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return 0;
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}
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static int
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librdf_storage_file_close(librdf_storage* storage)
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{
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return librdf_storage_file_sync(storage);
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}
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static int
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librdf_storage_file_size(librdf_storage* storage)
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{
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librdf_storage_file_context* context=(librdf_storage_file_context*)storage->context;
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return librdf_model_size(context->model);
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}
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static int
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librdf_storage_file_add_statement(librdf_storage* storage, librdf_statement* statement)
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{
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librdf_storage_file_context* context=(librdf_storage_file_context*)storage->context;
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context->changed=1;
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return librdf_model_add_statement(context->model, statement);
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}
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static int
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librdf_storage_file_add_statements(librdf_storage* storage,
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librdf_stream* statement_stream)
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{
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librdf_storage_file_context* context=(librdf_storage_file_context*)storage->context;
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context->changed=1;
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return librdf_model_add_statements(context->model, statement_stream);
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}
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static int
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librdf_storage_file_remove_statement(librdf_storage* storage, librdf_statement* statement)
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{
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librdf_storage_file_context* context=(librdf_storage_file_context*)storage->context;
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context->changed=1;
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return librdf_model_remove_statement(context->model, statement);
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}
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static int
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librdf_storage_file_contains_statement(librdf_storage* storage, librdf_statement* statement)
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{
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librdf_storage_file_context* context=(librdf_storage_file_context*)storage->context;
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return librdf_model_contains_statement(context->model, statement);
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}
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static librdf_stream*
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librdf_storage_file_serialise(librdf_storage* storage)
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{
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librdf_storage_file_context* context=(librdf_storage_file_context*)storage->context;
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return librdf_model_as_stream(context->model);
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}
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static librdf_stream*
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librdf_storage_file_find_statements(librdf_storage* storage, librdf_statement* statement)
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{
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librdf_storage_file_context* context=(librdf_storage_file_context*)storage->context;
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return librdf_model_find_statements(context->model, statement);
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}
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static int
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librdf_storage_file_sync(librdf_storage *storage)
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{
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librdf_storage_file_context* context=(librdf_storage_file_context*)storage->context;
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char *backup_name;
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char *new_name;
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librdf_serializer* serializer;
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FILE *fh;
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int rc=0;
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if(!context->changed)
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return 0;
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if(!context->name) {
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/* FIXME - URI cannot be written */
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context->changed=0;
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return 0;
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}
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backup_name=NULL;
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if(!access((const char*)context->name, F_OK)) {
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/* name"~\0" */
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backup_name=(char*)LIBRDF_MALLOC(cstring, context->name_len+2);
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if(!backup_name)
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return 1;
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strcpy(backup_name, (const char*)context->name);
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backup_name[context->name_len]='~';
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backup_name[context->name_len+1]='\0';
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if(rename(context->name, backup_name) < 0) {
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librdf_log(storage->world, 0, LIBRDF_LOG_ERROR, LIBRDF_FROM_STORAGE, NULL,
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"rename of '%s' to '%s' failed - %s",
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context->name, backup_name, strerror(errno));
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LIBRDF_FREE(cstring, backup_name);
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return 1;
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}
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}
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/* name".new\0" */
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new_name=(char*)LIBRDF_MALLOC(cstring, context->name_len+5);
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if(!new_name)
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return 1;
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strcpy(new_name, (const char*)context->name);
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strcpy(new_name+context->name_len, ".new");
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serializer=librdf_new_serializer(storage->world, "rdfxml", NULL, NULL);
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if(!serializer) {
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LIBRDF_FREE(cstring, new_name);
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if(backup_name)
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LIBRDF_FREE(cstring, backup_name);
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return 1;
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}
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fh=fopen(new_name, "w+");
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if(!fh) {
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librdf_log(storage->world, 0, LIBRDF_LOG_ERROR, LIBRDF_FROM_STORAGE, NULL,
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"failed to open file '%s' for writing - %s",
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new_name, strerror(errno));
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rc=1;
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} else {
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librdf_serializer_serialize_model_to_file_handle(serializer, fh,
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context->uri,
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context->model);
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fclose(fh);
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}
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librdf_free_serializer(serializer);
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if(fh && rename(new_name, context->name) < 0) {
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librdf_log(storage->world, 0, LIBRDF_LOG_ERROR, LIBRDF_FROM_STORAGE, NULL,
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"rename of '%s' to '%s' failed - %s (%d)",
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new_name, context->name, strerror(errno), errno);
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fh=NULL;
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rc=1;
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}
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LIBRDF_FREE(cstring, new_name);
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/* restore backup on failure (fh=NULL) */
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if(!fh && backup_name && rename(backup_name, context->name) < 0) {
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librdf_log(storage->world, 0, LIBRDF_LOG_ERROR, LIBRDF_FROM_STORAGE, NULL,
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"rename of '%s' to '%s' failed - %s",
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backup_name, context->name, strerror(errno));
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rc=1;
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}
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if(backup_name)
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LIBRDF_FREE(cstring, backup_name);
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context->changed=0;
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return rc;
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}
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static librdf_node*
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librdf_storage_file_get_feature(librdf_storage* storage, librdf_uri* feature)
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{
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return NULL;
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}
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/* local function to register list storage functions */
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static void
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librdf_storage_file_register_factory(librdf_storage_factory *factory)
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{
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factory->context_length = sizeof(librdf_storage_file_context);
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factory->init = librdf_storage_file_init;
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factory->terminate = librdf_storage_file_terminate;
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factory->open = librdf_storage_file_open;
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factory->close = librdf_storage_file_close;
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factory->size = librdf_storage_file_size;
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factory->add_statement = librdf_storage_file_add_statement;
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factory->add_statements = librdf_storage_file_add_statements;
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factory->remove_statement = librdf_storage_file_remove_statement;
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factory->contains_statement = librdf_storage_file_contains_statement;
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factory->serialise = librdf_storage_file_serialise;
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factory->find_statements = librdf_storage_file_find_statements;
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factory->sync = librdf_storage_file_sync;
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factory->get_feature = librdf_storage_file_get_feature;
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}
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/**
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* librdf_init_storage_file:
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* @world: world object
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*
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* INTERNAL - initialise the storage_file module.
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**/
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void
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librdf_init_storage_file(librdf_world *world)
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{
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librdf_storage_register_factory(world, "file", "Local file based store",
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&librdf_storage_file_register_factory);
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librdf_storage_register_factory(world, "uri", "URI store (read-only)",
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&librdf_storage_file_register_factory);
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}
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