/*
* Copyright (C) 2002 Jorn Baayen <jorn@nl.linux.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Id$
*/
#include "ephy-node-db.h"
static void ephy_node_db_class_init (EphyNodeDbClass *klass);
static void ephy_node_db_init (EphyNodeDb *node);
static void ephy_node_db_finalize (GObject *object);
/* FIXME I want to find a better way to deal with "root" nodes */
#define RESERVED_IDS 30
enum
{
PROP_0,
PROP_NAME
};
#define EPHY_NODE_DB_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EPHY_TYPE_NODE_DB, EphyNodeDbPrivate))
struct EphyNodeDbPrivate
{
char *name;
GMutex *id_factory_lock;
long id_factory;
GStaticRWLock *id_to_node_lock;
GPtrArray *id_to_node;
};
static GHashTable *ephy_node_databases = NULL;
static GObjectClass *parent_class = NULL;
GType
ephy_node_db_get_type (void)
{
static GType ephy_node_db_type = 0;
if (ephy_node_db_type == 0) {
static const GTypeInfo our_info = {
sizeof (EphyNodeDbClass),
NULL,
NULL,
(GClassInitFunc) ephy_node_db_class_init,
NULL,
NULL,
sizeof (EphyNodeDb),
0,
(GInstanceInitFunc) ephy_node_db_init
};
ephy_node_db_type = g_type_register_static (G_TYPE_OBJECT,
"EphyNodeDb",
&our_info, 0);
}
return ephy_node_db_type;
}
static void
ephy_node_db_set_name (EphyNodeDb *db, const char *name)
{
db->priv->name = g_strdup (name);
if (ephy_node_databases == NULL)
{
ephy_node_databases = g_hash_table_new (g_str_hash, g_str_equal);
}
g_hash_table_insert (ephy_node_databases, db->priv->name, db);
}
static void
ephy_node_db_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
EphyNodeDb *db;
db = EPHY_NODE_DB (object);
switch (prop_id)
{
case PROP_NAME:
g_value_set_string (value, db->priv->name);
break;
}
}
static void
ephy_node_db_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
EphyNodeDb *db;
db = EPHY_NODE_DB (object);
switch (prop_id)
{
case PROP_NAME:
ephy_node_db_set_name (db, g_value_get_string (value));
break;
}
}
static void
ephy_node_db_class_init (EphyNodeDbClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = ephy_node_db_finalize;
object_class->set_property = ephy_node_db_set_property;
object_class->get_property = ephy_node_db_get_property;
g_object_class_install_property (object_class,
PROP_NAME,
g_param_spec_string ("name",
"Name",
"Name",
NULL,
G_PARAM_READWRITE));
g_type_class_add_private (object_class, sizeof (EphyNodeDbPrivate));
}
static void
ephy_node_db_init (EphyNodeDb *db)
{
db->priv = EPHY_NODE_DB_GET_PRIVATE (db);
db->priv->name = NULL;
/* id to node */
db->priv->id_to_node = g_ptr_array_new ();
db->priv->id_to_node_lock = g_new0 (GStaticRWLock, 1);
g_static_rw_lock_init (db->priv->id_to_node_lock);
/* id factory */
db->priv->id_factory = RESERVED_IDS;
db->priv->id_factory_lock = g_mutex_new ();
}
static void
ephy_node_db_finalize (GObject *object)
{
EphyNodeDb *db = EPHY_NODE_DB (object);
g_hash_table_remove (ephy_node_databases, db->priv->name);
if (g_hash_table_size (ephy_node_databases) == 0)
{
g_hash_table_destroy (ephy_node_databases);
}
g_ptr_array_free (db->priv->id_to_node, FALSE);
g_static_rw_lock_free (db->priv->id_to_node_lock);
g_mutex_free (db->priv->id_factory_lock);
g_free (db->priv->name);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
EphyNodeDb *
ephy_node_db_get_by_name (const char *name)
{
EphyNodeDb *ret;
ret = g_hash_table_lookup (ephy_node_databases, name);
return ret;
}
EphyNodeDb *
ephy_node_db_new (const char *name)
{
EphyNodeDb *db;
db = EPHY_NODE_DB (g_object_new (EPHY_TYPE_NODE_DB,
"name", name,
NULL));
g_return_val_if_fail (db->priv != NULL, NULL);
return db;
}
static inline EphyNode *
node_from_id_real (EphyNodeDb *db, long id)
{
EphyNode *ret = NULL;
if (id < db->priv->id_to_node->len)
ret = g_ptr_array_index (db->priv->id_to_node, id);;
return ret;
}
const char *
ephy_node_db_get_name (EphyNodeDb *db)
{
return db->priv->name;
}
EphyNode *
ephy_node_db_get_node_from_id (EphyNodeDb *db, long id)
{
EphyNode *ret = NULL;
g_static_rw_lock_reader_lock (db->priv->id_to_node_lock);
ret = node_from_id_real (db, id);
g_static_rw_lock_reader_unlock (db->priv->id_to_node_lock);
return ret;
}
long
_ephy_node_db_new_id (EphyNodeDb *db)
{
long ret;
g_mutex_lock (db->priv->id_factory_lock);
while (node_from_id_real (db, db->priv->id_factory) != NULL)
{
db->priv->id_factory++;
}
ret = db->priv->id_factory;
g_mutex_unlock (db->priv->id_factory_lock);
return ret;
}
void
_ephy_node_db_add_id (EphyNodeDb *db,
long id,
EphyNode *node)
{
g_static_rw_lock_writer_lock (db->priv->id_to_node_lock);
/* resize array if needed */
if (id >= db->priv->id_to_node->len)
g_ptr_array_set_size (db->priv->id_to_node, id + 1);
g_ptr_array_index (db->priv->id_to_node, id) = node;
g_static_rw_lock_writer_unlock (db->priv->id_to_node_lock);
}
void
_ephy_node_db_remove_id (EphyNodeDb *db,
long id)
{
g_static_rw_lock_writer_lock (db->priv->id_to_node_lock);
g_ptr_array_index (db->priv->id_to_node, id) = NULL;
/* reset id factory so we use the freed node id */
db->priv->id_factory = RESERVED_IDS;
g_static_rw_lock_writer_unlock (db->priv->id_to_node_lock);
}
