gio: GCancellable can be used concurrently
[platform/upstream/glib.git] / gio / gfileicon.c
1 /* GIO - GLib Input, Output and Streaming Library
2  * 
3  * Copyright (C) 2006-2007 Red Hat, Inc.
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2 of the License, or (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General
16  * Public License along with this library; if not, write to the
17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
18  * Boston, MA 02111-1307, USA.
19  *
20  * Author: Alexander Larsson <alexl@redhat.com>
21  */
22
23 #include "config.h"
24
25 #include "gfileicon.h"
26 #include "gfile.h"
27 #include "gicon.h"
28 #include "glibintl.h"
29 #include "gloadableicon.h"
30 #include "ginputstream.h"
31 #include "gsimpleasyncresult.h"
32 #include "gioerror.h"
33
34
35 /**
36  * SECTION:gfileicon
37  * @short_description: Icons pointing to an image file
38  * @include: gio/gio.h
39  * @see_also: #GIcon, #GLoadableIcon
40  * 
41  * #GFileIcon specifies an icon by pointing to an image file
42  * to be used as icon.
43  * 
44  **/
45
46 static void g_file_icon_icon_iface_init          (GIconIface          *iface);
47 static void g_file_icon_loadable_icon_iface_init (GLoadableIconIface  *iface);
48 static void g_file_icon_load_async               (GLoadableIcon       *icon,
49                                                   int                  size,
50                                                   GCancellable        *cancellable,
51                                                   GAsyncReadyCallback  callback,
52                                                   gpointer             user_data);
53
54 struct _GFileIcon
55 {
56   GObject parent_instance;
57
58   GFile *file;
59 };
60
61 struct _GFileIconClass
62 {
63   GObjectClass parent_class;
64 };
65
66 enum
67 {
68   PROP_0,
69   PROP_FILE
70 };
71
72 G_DEFINE_TYPE_WITH_CODE (GFileIcon, g_file_icon, G_TYPE_OBJECT,
73                          G_IMPLEMENT_INTERFACE (G_TYPE_ICON,
74                                                 g_file_icon_icon_iface_init)
75                          G_IMPLEMENT_INTERFACE (G_TYPE_LOADABLE_ICON,
76                                                 g_file_icon_loadable_icon_iface_init))
77
78 static void
79 g_file_icon_get_property (GObject    *object,
80                           guint       prop_id,
81                           GValue     *value,
82                           GParamSpec *pspec)
83 {
84   GFileIcon *icon = G_FILE_ICON (object);
85
86   switch (prop_id)
87     {
88       case PROP_FILE:
89         g_value_set_object (value, icon->file);
90         break;
91
92       default:
93         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
94     }
95 }
96
97 static void
98 g_file_icon_set_property (GObject      *object,
99                           guint         prop_id,
100                           const GValue *value,
101                           GParamSpec   *pspec)
102 {
103   GFileIcon *icon = G_FILE_ICON (object);
104
105   switch (prop_id)
106     {
107       case PROP_FILE:
108         icon->file = G_FILE (g_value_dup_object (value));
109         break;
110
111       default:
112         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
113     }
114 }
115
116 static void
117 g_file_icon_finalize (GObject *object)
118 {
119   GFileIcon *icon;
120
121   icon = G_FILE_ICON (object);
122
123   g_object_unref (icon->file);
124
125   G_OBJECT_CLASS (g_file_icon_parent_class)->finalize (object);
126 }
127
128 static void
129 g_file_icon_class_init (GFileIconClass *klass)
130 {
131   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
132   
133   gobject_class->get_property = g_file_icon_get_property;
134   gobject_class->set_property = g_file_icon_set_property;
135   gobject_class->finalize = g_file_icon_finalize;
136
137   /**
138    * GFileIcon:file:
139    *
140    * The file containing the icon.
141    */
142   g_object_class_install_property (gobject_class, PROP_FILE,
143                                    g_param_spec_object ("file",
144                                                         P_("file"),
145                                                         P_("The file containing the icon"),
146                                                         G_TYPE_FILE,
147                                                         G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK));
148 }
149
150 static void
151 g_file_icon_init (GFileIcon *file)
152 {
153 }
154
155 /**
156  * g_file_icon_new:
157  * @file: a #GFile.
158  * 
159  * Creates a new icon for a file.
160  * 
161  * Returns: (transfer full): a #GIcon for the given @file, or %NULL on error.
162  **/
163 GIcon *
164 g_file_icon_new (GFile *file)
165 {
166   g_return_val_if_fail (G_IS_FILE (file), NULL);
167
168   return G_ICON (g_object_new (G_TYPE_FILE_ICON, "file", file, NULL));
169 }
170
171 /**
172  * g_file_icon_get_file:
173  * @icon: a #GIcon.
174  * 
175  * Gets the #GFile associated with the given @icon.
176  * 
177  * Returns: (transfer none): a #GFile, or %NULL.
178  **/
179 GFile *
180 g_file_icon_get_file (GFileIcon *icon)
181 {
182   g_return_val_if_fail (G_IS_FILE_ICON (icon), NULL);
183
184   return icon->file;
185 }
186
187 static guint
188 g_file_icon_hash (GIcon *icon)
189 {
190   GFileIcon *file_icon = G_FILE_ICON (icon);
191
192   return g_file_hash (file_icon->file);
193 }
194
195 static gboolean
196 g_file_icon_equal (GIcon *icon1,
197                    GIcon *icon2)
198 {
199   GFileIcon *file1 = G_FILE_ICON (icon1);
200   GFileIcon *file2 = G_FILE_ICON (icon2);
201   
202   return g_file_equal (file1->file, file2->file);
203 }
204
205 static gboolean
206 g_file_icon_to_tokens (GIcon *icon,
207                        GPtrArray *tokens,
208                        gint  *out_version)
209 {
210   GFileIcon *file_icon = G_FILE_ICON (icon);
211
212   g_return_val_if_fail (out_version != NULL, FALSE);
213
214   *out_version = 0;
215
216   g_ptr_array_add (tokens, g_file_get_uri (file_icon->file));
217   return TRUE;
218 }
219
220 static GIcon *
221 g_file_icon_from_tokens (gchar  **tokens,
222                          gint     num_tokens,
223                          gint     version,
224                          GError **error)
225 {
226   GIcon *icon;
227   GFile *file;
228
229   icon = NULL;
230
231   if (version != 0)
232     {
233       g_set_error (error,
234                    G_IO_ERROR,
235                    G_IO_ERROR_INVALID_ARGUMENT,
236                    _("Can't handle version %d of GFileIcon encoding"),
237                    version);
238       goto out;
239     }
240
241   if (num_tokens != 1)
242     {
243       g_set_error_literal (error,
244                            G_IO_ERROR,
245                            G_IO_ERROR_INVALID_ARGUMENT,
246                            _("Malformed input data for GFileIcon"));
247       goto out;
248     }
249
250   file = g_file_new_for_uri (tokens[0]);
251   icon = g_file_icon_new (file);
252   g_object_unref (file);
253
254  out:
255   return icon;
256 }
257
258 static void
259 g_file_icon_icon_iface_init (GIconIface *iface)
260 {
261   iface->hash = g_file_icon_hash;
262   iface->equal = g_file_icon_equal;
263   iface->to_tokens = g_file_icon_to_tokens;
264   iface->from_tokens = g_file_icon_from_tokens;
265 }
266
267
268 static GInputStream *
269 g_file_icon_load (GLoadableIcon  *icon,
270                   int            size,
271                   char          **type,
272                   GCancellable   *cancellable,
273                   GError        **error)
274 {
275   GFileInputStream *stream;
276   GFileIcon *file_icon = G_FILE_ICON (icon);
277
278   stream = g_file_read (file_icon->file,
279                         cancellable,
280                         error);
281   
282   return G_INPUT_STREAM (stream);
283 }
284
285 typedef struct {
286   GLoadableIcon *icon;
287   GAsyncReadyCallback callback;
288   gpointer user_data;
289 } LoadData;
290
291 static void
292 load_data_free (LoadData *data)
293 {
294   g_object_unref (data->icon);
295   g_free (data);
296 }
297
298 static void
299 load_async_callback (GObject      *source_object,
300                      GAsyncResult *res,
301                      gpointer      user_data)
302 {
303   GFileInputStream *stream;
304   GError *error = NULL;
305   GSimpleAsyncResult *simple;
306   LoadData *data = user_data;
307
308   stream = g_file_read_finish (G_FILE (source_object), res, &error);
309   
310   if (stream == NULL)
311     {
312       simple = g_simple_async_result_new_take_error (G_OBJECT (data->icon),
313                                                      data->callback,
314                                                      data->user_data,
315                                                      error);
316     }
317   else
318     {
319       simple = g_simple_async_result_new (G_OBJECT (data->icon),
320                                           data->callback,
321                                           data->user_data,
322                                           g_file_icon_load_async);
323       
324       g_simple_async_result_set_op_res_gpointer (simple,
325                                                  stream,
326                                                  g_object_unref);
327   }
328
329
330   g_simple_async_result_complete (simple);
331   
332   load_data_free (data);
333 }
334
335 static void
336 g_file_icon_load_async (GLoadableIcon       *icon,
337                         int                  size,
338                         GCancellable        *cancellable,
339                         GAsyncReadyCallback  callback,
340                         gpointer             user_data)
341 {
342   GFileIcon *file_icon = G_FILE_ICON (icon);
343   LoadData *data;
344
345   data = g_new0 (LoadData, 1);
346   data->icon = g_object_ref (icon);
347   data->callback = callback;
348   data->user_data = user_data;
349   
350   g_file_read_async (file_icon->file, 0,
351                      cancellable,
352                      load_async_callback, data);
353   
354 }
355
356 static GInputStream *
357 g_file_icon_load_finish (GLoadableIcon  *icon,
358                          GAsyncResult   *res,
359                          char          **type,
360                          GError        **error)
361 {
362   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
363   gpointer op;
364
365   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_file_icon_load_async);
366
367   if (type)
368     *type = NULL;
369   
370   op = g_simple_async_result_get_op_res_gpointer (simple);
371   if (op)
372     return g_object_ref (op);
373   
374   return NULL;
375 }
376
377 static void
378 g_file_icon_loadable_icon_iface_init (GLoadableIconIface *iface)
379 {
380   iface->load = g_file_icon_load;
381   iface->load_async = g_file_icon_load_async;
382   iface->load_finish = g_file_icon_load_finish;
383 }