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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpidtable.c
* Copyright (C) 2011 Martin Nordholts <martinn@src.gnome.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 3 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, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gio/gio.h>
#include <gegl.h>
#include "core-types.h"
#include "gimp-memsize.h"
#include "gimpidtable.h"
#define GIMP_ID_TABLE_START_ID 1
#define GIMP_ID_TABLE_END_ID G_MAXINT
struct _GimpIdTablePrivate
{
GHashTable *id_table;
gint next_id;
};
static void gimp_id_table_finalize (GObject *object);
static gint64 gimp_id_table_get_memsize (GimpObject *object,
gint64 *gui_size);
G_DEFINE_TYPE_WITH_PRIVATE (GimpIdTable, gimp_id_table, GIMP_TYPE_OBJECT)
#define parent_class gimp_id_table_parent_class
static void
gimp_id_table_class_init (GimpIdTableClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpObjectClass *gimp_object_class = GIMP_OBJECT_CLASS (klass);
object_class->finalize = gimp_id_table_finalize;
gimp_object_class->get_memsize = gimp_id_table_get_memsize;
}
static void
gimp_id_table_init (GimpIdTable *id_table)
{
id_table->priv = gimp_id_table_get_instance_private (id_table);
id_table->priv->id_table = g_hash_table_new (g_direct_hash, NULL);
id_table->priv->next_id = GIMP_ID_TABLE_START_ID;
}
static void
gimp_id_table_finalize (GObject *object)
{
GimpIdTable *id_table = GIMP_ID_TABLE (object);
g_clear_pointer (&id_table->priv->id_table, g_hash_table_unref);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gint64
gimp_id_table_get_memsize (GimpObject *object,
gint64 *gui_size)
{
GimpIdTable *id_table = GIMP_ID_TABLE (object);
gint64 memsize = 0;
memsize += gimp_g_hash_table_get_memsize (id_table->priv->id_table, 0);
return memsize + GIMP_OBJECT_CLASS (parent_class)->get_memsize (object,
gui_size);
}
/**
* gimp_id_table_new:
*
* Returns: A new #GimpIdTable.
**/
GimpIdTable *
gimp_id_table_new (void)
{
return g_object_new (GIMP_TYPE_ID_TABLE, NULL);
}
/**
* gimp_id_table_insert:
* @id_table: A #GimpIdTable
* @data: Data to insert and assign an id to
*
* Insert data in the id table. The data will get an, in this table,
* unused ID assigned to it that can be used to later lookup the data.
*
* Returns: The assigned ID.
**/
gint
gimp_id_table_insert (GimpIdTable *id_table, gpointer data)
{
gint new_id;
gint start_id;
g_return_val_if_fail (GIMP_IS_ID_TABLE (id_table), 0);
start_id = id_table->priv->next_id;
do
{
new_id = id_table->priv->next_id++;
if (id_table->priv->next_id == GIMP_ID_TABLE_END_ID)
id_table->priv->next_id = GIMP_ID_TABLE_START_ID;
if (start_id == id_table->priv->next_id)
{
/* We looped once over all used ids. Very unlikely to happen.
And if it does, there is probably not much to be done.
It is just good design not to allow a theoretical infinite loop. */
g_error ("%s: out of ids!", G_STRFUNC);
break;
}
}
while (gimp_id_table_lookup (id_table, new_id));
return gimp_id_table_insert_with_id (id_table, new_id, data);
}
/**
* gimp_id_table_insert_with_id:
* @id_table: An #GimpIdTable
* @id: The ID to use. Must be greater than 0.
* @data: The data to associate with the id
*
* Insert data in the id table with a specific ID. If data already
* exsts with the given ID, this function fails.
*
* Returns: The used ID if successful, -1 if it was already in use.
**/
gint
gimp_id_table_insert_with_id (GimpIdTable *id_table, gint id, gpointer data)
{
g_return_val_if_fail (GIMP_IS_ID_TABLE (id_table), 0);
g_return_val_if_fail (id > 0, 0);
if (gimp_id_table_lookup (id_table, id))
return -1;
g_hash_table_insert (id_table->priv->id_table, GINT_TO_POINTER (id), data);
return id;
}
/**
* gimp_id_table_replace:
* @id_table: An #GimpIdTable
* @id: The ID to use. Must be greater than 0.
* @data: The data to insert/replace
*
* Replaces (if an item with the given ID exists) or inserts a new
* entry in the id table.
**/
void
gimp_id_table_replace (GimpIdTable *id_table, gint id, gpointer data)
{
g_return_if_fail (GIMP_IS_ID_TABLE (id_table));
g_return_if_fail (id > 0);
g_hash_table_replace (id_table->priv->id_table, GINT_TO_POINTER (id), data);
}
/**
* gimp_id_table_lookup:
* @id_table: An #GimpIdTable
* @id: The ID of the data to lookup
*
* Lookup data based on ID.
*
* Returns: The data, or NULL if no data with the given ID was found.
**/
gpointer
gimp_id_table_lookup (GimpIdTable *id_table, gint id)
{
g_return_val_if_fail (GIMP_IS_ID_TABLE (id_table), NULL);
return g_hash_table_lookup (id_table->priv->id_table, GINT_TO_POINTER (id));
}
/**
* gimp_id_table_remove:
* @id_table: An #GimpIdTable
* @id: The ID of the data to remove.
*
* Remove the data from the table with the given ID.
*
* Returns: %TRUE if data with the ID existed and was successfully
* removed, %FALSE otherwise.
**/
gboolean
gimp_id_table_remove (GimpIdTable *id_table, gint id)
{
g_return_val_if_fail (GIMP_IS_ID_TABLE (id_table), FALSE);
g_return_val_if_fail (id_table != NULL, FALSE);
return g_hash_table_remove (id_table->priv->id_table, GINT_TO_POINTER (id));
}
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