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 _EvMetadataManager EvMetadataManager;
48 typedef struct _Item Item;
52 time_t atime; /* time of last access */
57 struct _EvMetadataManager
59 gboolean values_loaded; /* It is true if the file
62 gboolean modified; /* It is true if the file
70 static gboolean ev_metadata_manager_save (gpointer data);
73 static EvMetadataManager *ev_metadata_manager = NULL;
77 * @data: a pointer to a #Item data
79 * It does free the values on the #GHashTable where data points.
82 item_free (gpointer data)
86 g_return_if_fail (data != NULL);
90 if (item->values != NULL)
91 g_hash_table_destroy (item->values);
97 * ev_metadata_arm_timeout
99 * Setup a timeout for saving the metadata to disk.
102 ev_metadata_arm_timeout(void)
104 if (ev_metadata_manager->timeout_id)
106 ev_metadata_manager->timeout_id =
107 g_timeout_add_full (G_PRIORITY_DEFAULT_IDLE,
109 (GSourceFunc)ev_metadata_manager_save,
115 * ev_metadata_manager_init:
117 * Creates an EvMetadataManager with default values.
119 * values_loaded -> %FALSE.
120 * modified -> %FALSE.
121 * timeout_id -> the id of the event source.
122 * items -> a new full empty #GHashTable.
125 ev_metadata_manager_init (void)
127 ev_metadata_manager = g_new0 (EvMetadataManager, 1);
129 ev_metadata_manager->values_loaded = FALSE;
130 ev_metadata_manager->modified = FALSE;
132 ev_metadata_manager->items =
133 g_hash_table_new_full (g_str_hash,
139 /* This function must be called before exiting ev */
141 ev_metadata_manager_shutdown (void)
143 if (ev_metadata_manager == NULL)
146 if (ev_metadata_manager->timeout_id)
147 g_source_remove (ev_metadata_manager->timeout_id);
149 ev_metadata_manager_save (NULL);
151 if (ev_metadata_manager->items != NULL)
152 g_hash_table_destroy (ev_metadata_manager->items);
154 g_free (ev_metadata_manager);
155 ev_metadata_manager = NULL;
159 value_free (gpointer data)
161 GValue *value = (GValue *)data;
163 g_value_unset (value);
168 parse_value (xmlChar *value, xmlChar *type)
173 ret_type = g_type_from_name ((char *)type);
174 ret = g_new0 (GValue, 1);
175 g_value_init (ret, ret_type);
179 g_value_set_string (ret, (char *)value);
182 g_value_set_int (ret, g_ascii_strtoull ((char *)value, NULL, 0));
185 g_value_set_double (ret, g_ascii_strtod ((char *)value, NULL));
188 g_value_set_boolean (ret, g_ascii_strtoull ((char *)value, NULL, 0));
196 parseItem (xmlDocPtr doc, xmlNodePtr cur)
203 if (xmlStrcmp (cur->name, (const xmlChar *)"document") != 0)
206 uri = xmlGetProp (cur, (const xmlChar *)"uri");
210 atime = xmlGetProp (cur, (const xmlChar *)"atime");
217 item = g_new0 (Item, 1);
219 item->atime = g_ascii_strtoull((char*)atime, NULL, 0);
221 item->values = g_hash_table_new_full (g_str_hash,
226 cur = cur->xmlChildrenNode;
230 if (xmlStrcmp (cur->name, (const xmlChar *)"entry") == 0)
237 key = xmlGetProp (cur, (const xmlChar *)"key");
238 xml_value = xmlGetProp (cur, (const xmlChar *)"value");
239 type = xmlGetProp (cur, (const xmlChar *)"type");
240 value = parse_value (xml_value, type);
242 if ((key != NULL) && (value != NULL))
243 g_hash_table_insert (item->values,
251 if (xml_value != NULL)
258 g_hash_table_insert (ev_metadata_manager->items,
273 g_return_val_if_fail (ev_metadata_manager != NULL, FALSE);
274 g_return_val_if_fail (ev_metadata_manager->values_loaded == FALSE, FALSE);
276 ev_metadata_manager->values_loaded = TRUE;
278 xmlKeepBlanksDefault (0);
280 /* FIXME: file locking - Paolo */
281 file_name = g_build_filename (ev_dot_dir (), METADATA_FILE, NULL);
282 if (!g_file_test (file_name, G_FILE_TEST_EXISTS))
288 doc = xmlParseFile (file_name);
296 cur = xmlDocGetRootElement (doc);
299 g_message ("The metadata file “%s” is empty", METADATA_FILE);
305 if (xmlStrcmp (cur->name, (const xmlChar *) "metadata"))
307 g_message ("File “%s” is of the wrong type", METADATA_FILE);
313 cur = xmlDocGetRootElement (doc);
314 cur = cur->xmlChildrenNode;
318 parseItem (doc, cur);
328 #define LAST_URI "last-used-value"
331 ev_metadata_manager_get_last (const gchar *key,
338 g_assert (ev_metadata_manager->values_loaded);
343 item = (Item *)g_hash_table_lookup (ev_metadata_manager->items,
349 item->atime = time (NULL);
351 if (item->values == NULL)
354 ret = (GValue *)g_hash_table_lookup (item->values, key);
357 g_value_init (value, G_VALUE_TYPE (ret));
358 g_value_copy (ret, value);
366 ev_metadata_manager_set_last (const gchar *key,
371 g_assert (ev_metadata_manager->values_loaded);
373 item = (Item *)g_hash_table_lookup (ev_metadata_manager->items,
378 item = g_new0 (Item, 1);
380 g_hash_table_insert (ev_metadata_manager->items,
385 if (item->values == NULL)
386 item->values = g_hash_table_new_full (g_str_hash,
393 new = g_new0 (GValue, 1);
394 g_value_init (new, G_VALUE_TYPE (value));
395 g_value_copy (value, new);
397 g_hash_table_insert (item->values,
401 g_hash_table_remove (item->values,
405 item->atime = time (NULL);
406 ev_metadata_manager->modified = TRUE;
407 ev_metadata_arm_timeout ();
412 * ev_metadata_manager_get:
413 * @uri: Uri to set data for, if @NULL, we return default value
414 * @key: Key to set uri
415 * @value: GValue struct filled up with value
416 * @ignore_last: if @TRUE, default value is ignored
418 * Retrieve value for uri in metadata database
420 * Returns: @TRUE if value was taken.
423 ev_metadata_manager_get (const gchar *uri,
426 gboolean ignore_last)
431 g_return_val_if_fail (key != NULL, FALSE);
433 if (ev_metadata_manager == NULL)
436 if (!ev_metadata_manager->values_loaded)
440 res = load_values ();
443 return ev_metadata_manager_get_last (key, value, ignore_last);
447 return ev_metadata_manager_get_last (key, value, ignore_last);
449 item = (Item *)g_hash_table_lookup (ev_metadata_manager->items,
453 return ev_metadata_manager_get_last (key, value, ignore_last);
455 item->atime = time (NULL);
457 if (item->values == NULL)
458 return ev_metadata_manager_get_last (key, value, ignore_last);
460 ret = (GValue *)g_hash_table_lookup (item->values, key);
463 g_value_init (value, G_VALUE_TYPE (ret));
464 g_value_copy (ret, value);
468 return ev_metadata_manager_get_last (key, value, ignore_last);
472 * ev_metadata_manager_set:
473 * @uri: Uri to set data for, if @NULL, we set default value
474 * @key: Key to set uri
475 * @value: GValue struct containing value
477 * Set value for key in metadata database
480 ev_metadata_manager_set (const gchar *uri,
486 g_return_if_fail (key != NULL);
488 if (ev_metadata_manager == NULL)
491 if (!ev_metadata_manager->values_loaded)
495 res = load_values ();
503 ev_metadata_manager_set_last (key, value);
507 item = (Item *)g_hash_table_lookup (ev_metadata_manager->items,
512 item = g_new0 (Item, 1);
514 g_hash_table_insert (ev_metadata_manager->items,
519 if (item->values == NULL)
520 item->values = g_hash_table_new_full (g_str_hash,
527 new = g_new0 (GValue, 1);
528 g_value_init (new, G_VALUE_TYPE (value));
529 g_value_copy (value, new);
531 g_hash_table_insert (item->values,
534 ev_metadata_manager_set_last (key, value);
536 g_hash_table_remove (item->values,
540 item->atime = time (NULL);
542 ev_metadata_manager->modified = TRUE;
543 ev_metadata_arm_timeout ();
547 save_values (const gchar *key, GValue *value, xmlNodePtr parent)
552 g_return_if_fail (key != NULL);
557 xml_node = xmlNewChild (parent, NULL, (const xmlChar *)"entry", NULL);
559 xmlSetProp (xml_node, (const xmlChar *)"key", (const xmlChar *)key);
560 xmlSetProp (xml_node,
561 (const xmlChar *)"type",
562 (const xmlChar *)g_type_name (G_VALUE_TYPE (value)));
564 switch (G_VALUE_TYPE (value)) {
566 string_value = g_strdup (g_value_get_string (value));
569 string_value = g_strdup_printf ("%d", g_value_get_int (value));
573 gchar buf[G_ASCII_DTOSTR_BUF_SIZE];
574 g_ascii_dtostr (buf, G_ASCII_DTOSTR_BUF_SIZE, g_value_get_double (value));
575 string_value = g_strdup_printf ("%s", buf);
579 string_value = g_strdup_printf ("%d", g_value_get_boolean (value));
583 g_assert_not_reached ();
586 xmlSetProp (xml_node, (const xmlChar *)"value", (const xmlChar *)string_value);
588 g_free (string_value);
592 save_item (const gchar *key, const gpointer *data, xmlNodePtr parent)
595 const Item *item = (const Item *)data;
598 g_return_if_fail (key != NULL);
603 xml_node = xmlNewChild (parent, NULL, (const xmlChar *)"document", NULL);
605 xmlSetProp (xml_node, (const xmlChar *)"uri", (const xmlChar *)key);
607 atime = g_strdup_printf ("%ld", item->atime);
608 xmlSetProp (xml_node, (const xmlChar *)"atime", (const xmlChar *)atime);
611 g_hash_table_foreach (item->values,
612 (GHFunc)save_values, xml_node);
616 get_oldest (const gchar *key, const gpointer value, const gchar ** key_to_remove)
618 const Item *item = (const Item *)value;
620 if (*key_to_remove == NULL)
622 *key_to_remove = key;
626 const Item *item_to_remove =
627 g_hash_table_lookup (ev_metadata_manager->items,
630 g_return_if_fail (item_to_remove != NULL);
632 if (item->atime < item_to_remove->atime)
634 *key_to_remove = key;
642 while (g_hash_table_size (ev_metadata_manager->items) > MAX_ITEMS)
644 gpointer key_to_remove = NULL;
646 g_hash_table_foreach (ev_metadata_manager->items,
650 g_return_if_fail (key_to_remove != NULL);
652 g_hash_table_remove (ev_metadata_manager->items,
658 ev_metadata_manager_save (gpointer data)
664 ev_metadata_manager->timeout_id = 0;
666 if (!ev_metadata_manager->modified)
671 xmlIndentTreeOutput = TRUE;
673 doc = xmlNewDoc ((const xmlChar *)"1.0");
677 /* Create metadata root */
678 root = xmlNewDocNode (doc, NULL, (const xmlChar *)"metadata", NULL);
679 xmlDocSetRootElement (doc, root);
681 g_hash_table_foreach (ev_metadata_manager->items,
682 (GHFunc)save_item, root);
684 /* FIXME: lock file - Paolo */
685 file_name = g_build_filename (ev_dot_dir (), METADATA_FILE, NULL);
686 xmlSaveFormatFile (file_name, doc, 1);
691 ev_metadata_manager->modified = FALSE;
696 void ev_metadata_arm_timeout(void)
698 if (ev_metadata_manager->timeout_id)
700 ev_metadata_manager->timeout_id =
701 g_timeout_add_full (G_PRIORITY_DEFAULT_IDLE,
703 (GSourceFunc)ev_metadata_manager_save,
708 ev_metadata_manager_set_int (const gchar *uri, const gchar *key, int value)
712 g_value_init (&val, G_TYPE_INT);
713 g_value_set_int (&val, value);
715 ev_metadata_manager_set (uri, key, &val);
717 g_value_unset (&val);
721 ev_metadata_manager_set_double (const gchar *uri, const gchar *key, double value)
725 g_value_init (&val, G_TYPE_DOUBLE);
726 g_value_set_double (&val, value);
728 ev_metadata_manager_set (uri, key, &val);
730 g_value_unset (&val);
734 ev_metadata_manager_set_string (const gchar *uri, const gchar *key, const gchar *value)
738 g_value_init (&val, G_TYPE_STRING);
739 g_value_set_string (&val, value);
741 ev_metadata_manager_set (uri, key, &val);
743 g_value_unset (&val);
747 ev_metadata_manager_set_boolean (const gchar *uri, const gchar *key, gboolean value)
751 g_value_init (&val, G_TYPE_BOOLEAN);
752 g_value_set_boolean (&val, value);
754 ev_metadata_manager_set (uri, key, &val);
756 g_value_unset (&val);