glib/gio/gvfs.c

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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
#include <config.h>
#include <string.h>
#include "gvfs.h"
#include "glocalvfs.h"
#include "giomodule.h"
#include "glibintl.h"
#include "gioalias.h"
/**
* SECTION:gvfs
* @short_description: Virtual File System
* @include: gio/gvfs.h
*
* Entry point for using GIO functionality.
*
**/
G_DEFINE_TYPE (GVfs, g_vfs, G_TYPE_OBJECT);
static void
g_vfs_class_init (GVfsClass *klass)
{
}
static void
g_vfs_init (GVfs *vfs)
{
}
/**
* g_vfs_is_active:
* @vfs: a #GVfs.
*
* Checks if the VFS is active.
*
* Returns: %TRUE if construction of the @vfs was successful and it is now active.
**/
gboolean
g_vfs_is_active (GVfs *vfs)
{
GVfsClass *class;
g_return_val_if_fail (G_IS_VFS (vfs), FALSE);
class = G_VFS_GET_CLASS (vfs);
return (* class->is_active) (vfs);
}
/**
* g_vfs_get_file_for_path:
* @vfs: a #GVfs.
* @path: a string containing a VFS path.
*
* Gets a #GFile for @path.
*
* Returns: a #GFile.
**/
GFile *
g_vfs_get_file_for_path (GVfs *vfs,
const char *path)
{
GVfsClass *class;
g_return_val_if_fail (G_IS_VFS (vfs), NULL);
g_return_val_if_fail (path != NULL, NULL);
class = G_VFS_GET_CLASS (vfs);
return (* class->get_file_for_path) (vfs, path);
}
/**
* g_vfs_get_file_for_uri:
* @vfs: a#GVfs.
* @uri: a string containing a URI path.
*
* Gets a #GFile for @uri.
*
* This operation never fails, but the returned object
* might not support any I/O operation if the uri
* is malformed or if the uri type is not supported.
*
* Returns: a #GFile.
*
**/
GFile *
g_vfs_get_file_for_uri (GVfs *vfs,
const char *uri)
{
GVfsClass *class;
g_return_val_if_fail (G_IS_VFS (vfs), NULL);
g_return_val_if_fail (uri != NULL, NULL);
class = G_VFS_GET_CLASS (vfs);
return (* class->get_file_for_uri) (vfs, uri);
}
/**
* g_vfs_get_supported_uri_schemes:
* @vfs: a #GVfs.
*
* Gets a list of URI schemes supported by @vfs.
*
* Returns: a list of strings.
**/
const gchar * const *
g_vfs_get_supported_uri_schemes (GVfs *vfs)
{
GVfsClass *class;
g_return_val_if_fail (G_IS_VFS (vfs), NULL);
class = G_VFS_GET_CLASS (vfs);
return (* class->get_supported_uri_schemes) (vfs);
}
/**
* g_vfs_parse_name:
* @vfs: a #GVfs.
* @parse_name: a string to be parsed by the VFS module.
*
* This operation never fails, but the returned object might
* not support any I/O operations if the @parse_name cannot
* be parsed by the #GVfs module.
*
* Returns: a #GFile for the given @parse_name.
**/
GFile *
g_vfs_parse_name (GVfs *vfs,
const char *parse_name)
{
GVfsClass *class;
g_return_val_if_fail (G_IS_VFS (vfs), NULL);
g_return_val_if_fail (parse_name != NULL, NULL);
class = G_VFS_GET_CLASS (vfs);
return (* class->parse_name) (vfs, parse_name);
}
/* Note: This compares in reverse order.
Higher prio -> sort first
*/
static gint
compare_vfs_type (gconstpointer a,
gconstpointer b,
gpointer user_data)
{
GVfsClass *class_a, *class_b;
gint res;
const char *use_this_vfs;
class_a = g_type_class_ref (*(GType *)a);
class_b = g_type_class_ref (*(GType *)b);
use_this_vfs = user_data;
if (class_a == class_b)
res = 0;
else if (use_this_vfs != NULL &&
strcmp (class_a->name, use_this_vfs) == 0)
res = -1;
else if (use_this_vfs != NULL &&
strcmp (class_b->name, use_this_vfs) == 0)
res = 1;
else
res = class_b->priority - class_a->priority;
g_type_class_unref (class_a);
g_type_class_unref (class_b);
return res;
}
static gpointer
get_default_vfs (gpointer arg)
{
volatile GType local_type;
GType *vfs_impls;
int i;
guint n_vfs_impls;
const char *use_this;
GVfs *vfs;
GType (*casted_get_type)(void);
use_this = g_getenv ("GIO_USE_VFS");
/* Ensure GLocalVfs type is available
the cast is required to avoid any G_GNUC_CONST optimizations */
casted_get_type = _g_local_vfs_get_type;
local_type = casted_get_type ();
/* Ensure vfs in modules loaded */
g_io_modules_ensure_loaded (GIO_MODULE_DIR);
vfs_impls = g_type_children (G_TYPE_VFS, &n_vfs_impls);
g_qsort_with_data (vfs_impls, n_vfs_impls, sizeof (GType),
compare_vfs_type, (gpointer)use_this);
for (i = 0; i < n_vfs_impls; i++)
{
vfs = g_object_new (vfs_impls[i], NULL);
if (g_vfs_is_active (vfs))
break;
g_object_unref (vfs);
vfs = NULL;
}
g_free (vfs_impls);
return vfs;
}
/**
* g_vfs_get_default:
*
* Gets the default #GVfs for the system.
*
* Returns: a #GVfs.
**/
GVfs *
g_vfs_get_default (void)
{
static GOnce once_init = G_ONCE_INIT;
return g_once (&once_init, get_default_vfs, NULL);
}
/**
* g_vfs_get_local:
*
* Gets the local #GVfs for the system.
*
* Returns: a #GVfs.
**/
GVfs *
g_vfs_get_local (void)
{
static gsize vfs = 0;
if (g_once_init_enter (&vfs))
g_once_init_leave (&vfs, (gsize)_g_local_vfs_new ());
return G_VFS (vfs);
}
#define __G_VFS_C__
#include "gioaliasdef.c"