233 lines
6.2 KiB
C
233 lines
6.2 KiB
C
/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* pikaidtable.c
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* Copyright (C) 2011 Martin Nordholts <martinn@src.gnome.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gio/gio.h>
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#include <gegl.h>
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#include "core-types.h"
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#include "pika-memsize.h"
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#include "pikaidtable.h"
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#define PIKA_ID_TABLE_START_ID 1
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#define PIKA_ID_TABLE_END_ID G_MAXINT
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struct _PikaIdTablePrivate
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{
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GHashTable *id_table;
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gint next_id;
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};
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static void pika_id_table_finalize (GObject *object);
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static gint64 pika_id_table_get_memsize (PikaObject *object,
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gint64 *gui_size);
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G_DEFINE_TYPE_WITH_PRIVATE (PikaIdTable, pika_id_table, PIKA_TYPE_OBJECT)
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#define parent_class pika_id_table_parent_class
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static void
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pika_id_table_class_init (PikaIdTableClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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PikaObjectClass *pika_object_class = PIKA_OBJECT_CLASS (klass);
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object_class->finalize = pika_id_table_finalize;
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pika_object_class->get_memsize = pika_id_table_get_memsize;
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}
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static void
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pika_id_table_init (PikaIdTable *id_table)
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{
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id_table->priv = pika_id_table_get_instance_private (id_table);
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id_table->priv->id_table = g_hash_table_new (g_direct_hash, NULL);
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id_table->priv->next_id = PIKA_ID_TABLE_START_ID;
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}
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static void
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pika_id_table_finalize (GObject *object)
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{
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PikaIdTable *id_table = PIKA_ID_TABLE (object);
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g_clear_pointer (&id_table->priv->id_table, g_hash_table_unref);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static gint64
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pika_id_table_get_memsize (PikaObject *object,
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gint64 *gui_size)
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{
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PikaIdTable *id_table = PIKA_ID_TABLE (object);
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gint64 memsize = 0;
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memsize += pika_g_hash_table_get_memsize (id_table->priv->id_table, 0);
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return memsize + PIKA_OBJECT_CLASS (parent_class)->get_memsize (object,
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gui_size);
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}
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/**
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* pika_id_table_new:
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*
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* Returns: A new #PikaIdTable.
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**/
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PikaIdTable *
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pika_id_table_new (void)
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{
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return g_object_new (PIKA_TYPE_ID_TABLE, NULL);
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}
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/**
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* pika_id_table_insert:
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* @id_table: A #PikaIdTable
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* @data: Data to insert and assign an id to
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*
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* Insert data in the id table. The data will get an, in this table,
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* unused ID assigned to it that can be used to later lookup the data.
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*
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* Returns: The assigned ID.
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**/
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gint
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pika_id_table_insert (PikaIdTable *id_table, gpointer data)
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{
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gint new_id;
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gint start_id;
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g_return_val_if_fail (PIKA_IS_ID_TABLE (id_table), 0);
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start_id = id_table->priv->next_id;
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do
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{
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new_id = id_table->priv->next_id++;
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if (id_table->priv->next_id == PIKA_ID_TABLE_END_ID)
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id_table->priv->next_id = PIKA_ID_TABLE_START_ID;
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if (start_id == id_table->priv->next_id)
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{
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/* We looped once over all used ids. Very unlikely to happen.
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And if it does, there is probably not much to be done.
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It is just good design not to allow a theoretical infinite loop. */
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g_error ("%s: out of ids!", G_STRFUNC);
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break;
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}
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}
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while (pika_id_table_lookup (id_table, new_id));
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return pika_id_table_insert_with_id (id_table, new_id, data);
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}
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/**
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* pika_id_table_insert_with_id:
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* @id_table: An #PikaIdTable
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* @id: The ID to use. Must be greater than 0.
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* @data: The data to associate with the id
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*
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* Insert data in the id table with a specific ID. If data already
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* exsts with the given ID, this function fails.
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*
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* Returns: The used ID if successful, -1 if it was already in use.
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**/
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gint
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pika_id_table_insert_with_id (PikaIdTable *id_table, gint id, gpointer data)
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{
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g_return_val_if_fail (PIKA_IS_ID_TABLE (id_table), 0);
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g_return_val_if_fail (id > 0, 0);
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if (pika_id_table_lookup (id_table, id))
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return -1;
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g_hash_table_insert (id_table->priv->id_table, GINT_TO_POINTER (id), data);
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return id;
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}
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/**
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* pika_id_table_replace:
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* @id_table: An #PikaIdTable
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* @id: The ID to use. Must be greater than 0.
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* @data: The data to insert/replace
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*
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* Replaces (if an item with the given ID exists) or inserts a new
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* entry in the id table.
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**/
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void
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pika_id_table_replace (PikaIdTable *id_table, gint id, gpointer data)
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{
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g_return_if_fail (PIKA_IS_ID_TABLE (id_table));
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g_return_if_fail (id > 0);
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g_hash_table_replace (id_table->priv->id_table, GINT_TO_POINTER (id), data);
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}
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/**
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* pika_id_table_lookup:
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* @id_table: An #PikaIdTable
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* @id: The ID of the data to lookup
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*
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* Lookup data based on ID.
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*
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* Returns: (nullable) (transfer none): The data,
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* or %NULL if no data with the given ID was found.
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**/
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gpointer
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pika_id_table_lookup (PikaIdTable *id_table, gint id)
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{
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g_return_val_if_fail (PIKA_IS_ID_TABLE (id_table), NULL);
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return g_hash_table_lookup (id_table->priv->id_table, GINT_TO_POINTER (id));
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}
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/**
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* pika_id_table_remove:
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* @id_table: An #PikaIdTable
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* @id: The ID of the data to remove.
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*
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* Remove the data from the table with the given ID.
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*
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* Returns: %TRUE if data with the ID existed and was successfully
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* removed, %FALSE otherwise.
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**/
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gboolean
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pika_id_table_remove (PikaIdTable *id_table, gint id)
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{
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g_return_val_if_fail (PIKA_IS_ID_TABLE (id_table), FALSE);
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g_return_val_if_fail (id_table != NULL, FALSE);
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return g_hash_table_remove (id_table->priv->id_table, GINT_TO_POINTER (id));
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}
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