1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
3 * ev-metadata-manager.c
4 * This file is part of ev
6 * Copyright (C) 2003 Paolo Maggi
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330,
21 * Boston, MA 02111-1307, USA.
25 * Modified by the ev Team, 2003. See the AUTHORS file for a
26 * list of people on the ev Team.
27 * See the ChangeLog files for a list of changes.
37 #include <libxml/xmlreader.h>
39 #include "ev-metadata-manager.h"
40 #include "ev-file-helpers.h"
42 #define METADATA_FILE "ev-metadata.xml"
46 typedef struct _GeditMetadataManager GeditMetadataManager;
48 typedef struct _Item Item;
52 time_t atime; /* time of last access */
57 struct _GeditMetadataManager
59 gboolean values_loaded; /* It is true if the file
62 gboolean modified; /* It is true if the file
70 static void ev_metadata_manager_save (gpointer data);
73 static GeditMetadataManager *ev_metadata_manager = NULL;
76 item_free (gpointer data)
80 g_return_if_fail (data != NULL);
84 if (item->values != NULL)
85 g_hash_table_destroy (item->values);
91 ev_metadata_manager_init (void)
93 if (ev_metadata_manager != NULL)
96 ev_metadata_manager = g_new0 (GeditMetadataManager, 1);
98 ev_metadata_manager->values_loaded = FALSE;
99 ev_metadata_manager->modified = FALSE;
101 ev_metadata_manager->items =
102 g_hash_table_new_full (g_str_hash,
107 ev_metadata_manager->timeout_id =
108 g_timeout_add_full (G_PRIORITY_DEFAULT_IDLE,
110 (GSourceFunc)ev_metadata_manager_save,
117 /* This function must be called before exiting ev */
119 ev_metadata_manager_shutdown (void)
121 if (ev_metadata_manager == NULL)
124 g_source_remove (ev_metadata_manager->timeout_id);
126 ev_metadata_manager_save (NULL);
128 if (ev_metadata_manager->items != NULL)
129 g_hash_table_destroy (ev_metadata_manager->items);
131 g_free (ev_metadata_manager);
132 ev_metadata_manager = NULL;
136 parse_value (xmlChar *value, xmlChar *type)
141 ret_type = g_type_from_name ((char *)type);
142 ret = g_new0 (GValue, 1);
143 g_value_init (ret, ret_type);
147 g_value_set_string (ret, (char *)value);
150 g_value_set_int (ret, atoi ((char *)value));
158 parseItem (xmlDocPtr doc, xmlNodePtr cur)
165 if (xmlStrcmp (cur->name, (const xmlChar *)"document") != 0)
168 uri = xmlGetProp (cur, (const xmlChar *)"uri");
172 atime = xmlGetProp (cur, (const xmlChar *)"atime");
179 item = g_new0 (Item, 1);
181 item->atime = atol ((char *)atime);
183 item->values = g_hash_table_new_full (g_str_hash,
188 cur = cur->xmlChildrenNode;
192 if (xmlStrcmp (cur->name, (const xmlChar *)"entry") == 0)
199 key = xmlGetProp (cur, (const xmlChar *)"key");
200 xml_value = xmlGetProp (cur, (const xmlChar *)"value");
201 type = xmlGetProp (cur, (const xmlChar *)"type");
202 value = parse_value (xml_value, type);
204 if ((key != NULL) && (value != NULL))
205 g_hash_table_insert (item->values,
211 if (xml_value != NULL)
218 g_hash_table_insert (ev_metadata_manager->items,
233 g_return_val_if_fail (ev_metadata_manager != NULL, FALSE);
234 g_return_val_if_fail (ev_metadata_manager->values_loaded == FALSE, FALSE);
236 ev_metadata_manager->values_loaded = TRUE;
238 xmlKeepBlanksDefault (0);
240 /* FIXME: file locking - Paolo */
241 file_name = g_build_filename (ev_dot_dir (), METADATA_FILE, NULL);
242 if (!g_file_test (file_name, G_FILE_TEST_EXISTS))
248 doc = xmlParseFile (file_name);
256 cur = xmlDocGetRootElement (doc);
259 g_message ("The metadata file '%s' is empty", METADATA_FILE);
265 if (xmlStrcmp (cur->name, (const xmlChar *) "metadata"))
267 g_message ("File '%s' is of the wrong type", METADATA_FILE);
273 cur = xmlDocGetRootElement (doc);
274 cur = cur->xmlChildrenNode;
278 parseItem (doc, cur);
289 ev_metadata_manager_get (const gchar *uri,
296 g_return_val_if_fail (uri != NULL, FALSE);
297 g_return_val_if_fail (key != NULL, FALSE);
299 if (ev_metadata_manager == NULL)
300 ev_metadata_manager_init ();
302 if (!ev_metadata_manager->values_loaded)
306 res = load_values ();
312 item = (Item *)g_hash_table_lookup (ev_metadata_manager->items,
318 item->atime = time (NULL);
320 if (item->values == NULL)
323 ret = (GValue *)g_hash_table_lookup (item->values, key);
328 g_value_init (value, G_VALUE_TYPE (ret));
329 g_value_copy (ret, value);
336 value_free (gpointer data)
338 GValue *value = (GValue *)data;
340 g_value_unset (value);
345 ev_metadata_manager_set (const gchar *uri,
351 g_return_if_fail (uri != NULL);
352 g_return_if_fail (key != NULL);
354 if (ev_metadata_manager == NULL)
355 ev_metadata_manager_init ();
357 if (!ev_metadata_manager->values_loaded)
361 res = load_values ();
367 item = (Item *)g_hash_table_lookup (ev_metadata_manager->items,
372 item = g_new0 (Item, 1);
374 g_hash_table_insert (ev_metadata_manager->items,
379 if (item->values == NULL)
380 item->values = g_hash_table_new_full (g_str_hash,
387 new = g_new0 (GValue, 1);
388 g_value_init (new, G_VALUE_TYPE (value));
389 g_value_copy (value, new);
391 g_hash_table_insert (item->values,
395 g_hash_table_remove (item->values,
399 item->atime = time (NULL);
401 ev_metadata_manager->modified = TRUE;
405 save_values (const gchar *key, GValue *value, xmlNodePtr parent)
410 g_return_if_fail (key != NULL);
415 xml_node = xmlNewChild (parent, NULL, (const xmlChar *)"entry", NULL);
417 xmlSetProp (xml_node, (const xmlChar *)"key", (const xmlChar *)key);
418 xmlSetProp (xml_node,
419 (const xmlChar *)"type",
420 (const xmlChar *)g_type_name (G_VALUE_TYPE (value)));
422 switch (G_VALUE_TYPE (value)) {
424 string_value = g_strdup (g_value_get_string (value));
427 string_value = g_strdup_printf ("%d", g_value_get_int (value));
431 g_assert_not_reached ();
434 xmlSetProp (xml_node, (const xmlChar *)"value", (const xmlChar *)string_value);
436 g_free (string_value);
440 save_item (const gchar *key, const gpointer *data, xmlNodePtr parent)
443 const Item *item = (const Item *)data;
446 g_return_if_fail (key != NULL);
451 xml_node = xmlNewChild (parent, NULL, (const xmlChar *)"document", NULL);
453 xmlSetProp (xml_node, (const xmlChar *)"uri", (const xmlChar *)key);
455 /* FIXME: is the cast right? - Paolo */
456 atime = g_strdup_printf ("%d", (int)item->atime);
457 xmlSetProp (xml_node, (const xmlChar *)"atime", (const xmlChar *)atime);
461 g_hash_table_foreach (item->values,
462 (GHFunc)save_values, xml_node);
466 get_oldest (const gchar *key, const gpointer value, const gchar ** key_to_remove)
468 const Item *item = (const Item *)value;
470 if (*key_to_remove == NULL)
472 *key_to_remove = key;
476 const Item *item_to_remove =
477 g_hash_table_lookup (ev_metadata_manager->items,
480 g_return_if_fail (item_to_remove != NULL);
482 if (item->atime < item_to_remove->atime)
484 *key_to_remove = key;
492 while (g_hash_table_size (ev_metadata_manager->items) > MAX_ITEMS)
494 gpointer key_to_remove = NULL;
496 g_hash_table_foreach (ev_metadata_manager->items,
500 g_return_if_fail (key_to_remove != NULL);
502 g_hash_table_remove (ev_metadata_manager->items,
508 ev_metadata_manager_save (gpointer data)
514 if (!ev_metadata_manager->modified)
519 xmlIndentTreeOutput = TRUE;
521 doc = xmlNewDoc ((const xmlChar *)"1.0");
525 /* Create metadata root */
526 root = xmlNewDocNode (doc, NULL, (const xmlChar *)"metadata", NULL);
527 xmlDocSetRootElement (doc, root);
529 g_hash_table_foreach (ev_metadata_manager->items,
530 (GHFunc)save_item, root);
532 /* FIXME: lock file - Paolo */
533 file_name = g_build_filename (ev_dot_dir (), METADATA_FILE, NULL);
534 xmlSaveFormatFile (file_name, doc, 1);
539 ev_metadata_manager->modified = FALSE;
543 ev_metadata_manager_set_int (const gchar *uri, const gchar *key, int value)
547 g_value_init (&val, G_TYPE_INT);
548 g_value_set_int (&val, value);
550 ev_metadata_manager_set (uri, key, &val);