/* 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 2.1 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, see <http://www.gnu.org/licenses/>.

 *

 * Author: Alexander Larsson <alexl@redhat.com>

 */

#include "config.h"

#include "gfileicon.h"

#include "gfile.h"

#include "gicon.h"

#include "glibintl.h"

#include "gloadableicon.h"

#include "ginputstream.h"

#include "gtask.h"

#include "gioerror.h"

/**

 * SECTION:gfileicon

 * @short_description: Icons pointing to an image file

 * @include: gio/gio.h

 * @see_also: #GIcon, #GLoadableIcon

 * 

 * #GFileIcon specifies an icon by pointing to an image file

 * to be used as icon.

 * 

 **/

static void g_file_icon_icon_iface_init          (GIconIface          *iface);

static void g_file_icon_loadable_icon_iface_init (GLoadableIconIface  *iface);

static void g_file_icon_load_async               (GLoadableIcon       *icon,

              int                  size,

              GCancellable        *cancellable,

              GAsyncReadyCallback  callback,

              gpointer             user_data);

struct _GFileIcon

{

  GObject parent_instance;

  GFile *file;

};

struct _GFileIconClass

{

  GObjectClass parent_class;

};

enum

{

  PROP_0,

  PROP_FILE

};

G_DEFINE_TYPE_WITH_CODE (GFileIcon, g_file_icon, G_TYPE_OBJECT,

                         G_IMPLEMENT_INTERFACE (G_TYPE_ICON,

                                                g_file_icon_icon_iface_init)

                         G_IMPLEMENT_INTERFACE (G_TYPE_LOADABLE_ICON,

                                                g_file_icon_loadable_icon_iface_init))

static void

g_file_icon_get_property (GObject    *object,

                          guint       prop_id,

                          GValue     *value,

                          GParamSpec *pspec)

{

  GFileIcon *icon = G_FILE_ICON (object);

  switch (prop_id)

    {

      case PROP_FILE:

        g_value_set_object (value, icon->file);

        break;

      default:

        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

    }

}

static void

g_file_icon_set_property (GObject      *object,

                          guint         prop_id,

                          const GValue *value,

                          GParamSpec   *pspec)

{

  GFileIcon *icon = G_FILE_ICON (object);

  switch (prop_id)

    {

      case PROP_FILE:

        icon->file = G_FILE (g_value_dup_object (value));

        break;

      default:

        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

    }

}

static void

g_file_icon_finalize (GObject *object)

{

  GFileIcon *icon;

  icon = G_FILE_ICON (object);

  if (icon->file)

    g_object_unref (icon->file);

  G_OBJECT_CLASS (g_file_icon_parent_class)->finalize (object);

}

static void

g_file_icon_class_init (GFileIconClass *klass)

{

  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);

  gobject_class->get_property = g_file_icon_get_property;

  gobject_class->set_property = g_file_icon_set_property;

  gobject_class->finalize = g_file_icon_finalize;

  /**

   * GFileIcon:file:

   *

   * The file containing the icon.

   */

  g_object_class_install_property (gobject_class, PROP_FILE,

                                   g_param_spec_object ("file",

                                                        P_("file"),

                                                        P_("The file containing the icon"),

                                                        G_TYPE_FILE,

                                                        G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK));

}

static void

g_file_icon_init (GFileIcon *file)

{

}

/**

 * g_file_icon_new:

 * @file: a #GFile.

 * 

 * Creates a new icon for a file.

 * 

 * Returns: (transfer full) (type GFileIcon): a #GIcon for the given

 *   @file, or %NULL on error.

 **/

GIcon *

g_file_icon_new (GFile *file)

{

  g_return_val_if_fail (G_IS_FILE (file), NULL);

  return G_ICON (g_object_new (G_TYPE_FILE_ICON, "file", file, NULL));

}

/**

 * g_file_icon_get_file:

 * @icon: a #GIcon.

 * 

 * Gets the #GFile associated with the given @icon.

 * 

 * Returns: (transfer none): a #GFile, or %NULL.

 **/

GFile *

g_file_icon_get_file (GFileIcon *icon)

{

  g_return_val_if_fail (G_IS_FILE_ICON (icon), NULL);

  return icon->file;

}

static guint

g_file_icon_hash (GIcon *icon)

{

  GFileIcon *file_icon = G_FILE_ICON (icon);

  return g_file_hash (file_icon->file);

}

static gboolean

g_file_icon_equal (GIcon *icon1,

       GIcon *icon2)

{

  GFileIcon *file1 = G_FILE_ICON (icon1);

  GFileIcon *file2 = G_FILE_ICON (icon2);

  return g_file_equal (file1->file, file2->file);

}

static gboolean

g_file_icon_to_tokens (GIcon *icon,

           GPtrArray *tokens,

                       gint  *out_version)

{

  GFileIcon *file_icon = G_FILE_ICON (icon);

  g_return_val_if_fail (out_version != NULL, FALSE);

  *out_version = 0;

  g_ptr_array_add (tokens, g_file_get_uri (file_icon->file));

  return TRUE;

}

static GIcon *

g_file_icon_from_tokens (gchar  **tokens,

                         gint     num_tokens,

                         gint     version,

                         GError **error)

{

  GIcon *icon;

  GFile *file;

  icon = NULL;

  if (version != 0)

    {

      g_set_error (error,

                   G_IO_ERROR,

                   G_IO_ERROR_INVALID_ARGUMENT,

                   _("Can’t handle version %d of GFileIcon encoding"),

                   version);

      goto out;

    }

  if (num_tokens != 1)

    {

      g_set_error_literal (error,

                           G_IO_ERROR,

                           G_IO_ERROR_INVALID_ARGUMENT,

                           _("Malformed input data for GFileIcon"));

      goto out;

    }

  file = g_file_new_for_uri (tokens[0]);

  icon = g_file_icon_new (file);

  g_object_unref (file);

 out:

  return icon;

}

static GVariant *

g_file_icon_serialize (GIcon *icon)

{

  GFileIcon *file_icon = G_FILE_ICON (icon);

  return g_variant_new ("(sv)", "file", g_variant_new_take_string (g_file_get_uri (file_icon->file)));

}

static void

g_file_icon_icon_iface_init (GIconIface *iface)

{

  iface->hash = g_file_icon_hash;

  iface->equal = g_file_icon_equal;

  iface->to_tokens = g_file_icon_to_tokens;

  iface->from_tokens = g_file_icon_from_tokens;

  iface->serialize = g_file_icon_serialize;

}

static GInputStream *

g_file_icon_load (GLoadableIcon  *icon,

      int            size,

      char          **type,

      GCancellable   *cancellable,

      GError        **error)

{

  GFileInputStream *stream;

  GFileIcon *file_icon = G_FILE_ICON (icon);

  stream = g_file_read (file_icon->file,

      cancellable,

      error);

  if (stream && type)

    *type = NULL;

  return G_INPUT_STREAM (stream);

}

static void

load_async_callback (GObject      *source_object,

         GAsyncResult *res,

         gpointer      user_data)

{

  GFileInputStream *stream;

  GError *error = NULL;

  GTask *task = user_data;

  stream = g_file_read_finish (G_FILE (source_object), res, &error);

  if (stream == NULL)

    g_task_return_error (task, error);

  else

    g_task_return_pointer (task, stream, g_object_unref);

  g_object_unref (task);

}

static void

g_file_icon_load_async (GLoadableIcon       *icon,

                        int                  size,

                        GCancellable        *cancellable,

                        GAsyncReadyCallback  callback,

                        gpointer             user_data)

{

  GFileIcon *file_icon = G_FILE_ICON (icon);

  GTask *task;

  task = g_task_new (icon, cancellable, callback, user_data);

  g_task_set_source_tag (task, g_file_icon_load_async);

  g_file_read_async (file_icon->file, 0,

                     cancellable,

                     load_async_callback, task);

}

static GInputStream *

g_file_icon_load_finish (GLoadableIcon  *icon,

       GAsyncResult   *res,

       char          **type,

       GError        **error)

{

  g_return_val_if_fail (g_task_is_valid (res, icon), NULL);

  if (type)

    *type = NULL;

  return g_task_propagate_pointer (G_TASK (res), error);

}

static void

g_file_icon_loadable_icon_iface_init (GLoadableIconIface *iface)

{

  iface->load = g_file_icon_load;

  iface->load_async = g_file_icon_load_async;

  iface->load_finish = g_file_icon_load_finish;

}