mirror of
https://gitlab.gnome.org/GNOME/nautilus
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125 lines
2.8 KiB
C
125 lines
2.8 KiB
C
/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*-
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Copyright (C) 2001 Maciej Stachowiak
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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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 GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public
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License along with this program; if not, write to the
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Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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Author: Maciej Stachowiak <mjs@noisehavoc.org>
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*/
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#include <config.h>
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#include "nautilus-file-queue.h"
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#include <glib.h>
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struct NautilusFileQueue {
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GList *head;
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GList *tail;
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GHashTable *item_to_link_map;
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};
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NautilusFileQueue *
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nautilus_file_queue_new (void)
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{
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NautilusFileQueue *queue;
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queue = g_new0 (NautilusFileQueue, 1);
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queue->item_to_link_map = g_hash_table_new (g_direct_hash, g_direct_equal);
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return queue;
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}
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void
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nautilus_file_queue_destroy (NautilusFileQueue *queue)
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{
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g_hash_table_destroy (queue->item_to_link_map);
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nautilus_file_list_free (queue->head);
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g_free (queue);
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}
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void
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nautilus_file_queue_enqueue (NautilusFileQueue *queue,
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NautilusFile *file)
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{
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if (g_hash_table_lookup (queue->item_to_link_map, file) != NULL) {
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/* It's already on the queue. */
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return;
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}
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if (queue->tail == NULL) {
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queue->head = g_list_append (NULL, file);
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queue->tail = queue->head;
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} else {
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g_list_append (queue->tail, file);
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queue->tail = queue->tail->next;
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}
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nautilus_file_ref (file);
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g_hash_table_insert (queue->item_to_link_map, file, queue->tail);
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}
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NautilusFile *
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nautilus_file_queue_dequeue (NautilusFileQueue *queue)
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{
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NautilusFile *file;
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file = nautilus_file_queue_head (queue);
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nautilus_file_queue_remove (queue, file);
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return file;
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}
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void
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nautilus_file_queue_remove (NautilusFileQueue *queue,
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NautilusFile *file)
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{
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GList *link;
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link = g_hash_table_lookup (queue->item_to_link_map, file);
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if (link == NULL) {
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/* It's not on the queue */
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return;
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}
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if (link == queue->tail) {
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/* Need to special-case removing the tail. */
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queue->tail = queue->tail->prev;
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}
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queue->head = g_list_remove_link (queue->head, link);
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g_list_free (link);
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g_hash_table_remove (queue->item_to_link_map, file);
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nautilus_file_unref (file);
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}
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NautilusFile *
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nautilus_file_queue_head (NautilusFileQueue *queue)
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{
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if (queue->head == NULL) {
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return NULL;
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}
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return NAUTILUS_FILE (queue->head->data);
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}
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gboolean
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nautilus_file_queue_is_empty (NautilusFileQueue *queue)
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{
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return (queue->head == NULL);
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}
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