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-rw-r--r--src/nautilus-file-queue.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/src/nautilus-file-queue.c b/src/nautilus-file-queue.c
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+/*
+ Copyright (C) 2001 Maciej Stachowiak
+
+ 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, see <http://www.gnu.org/licenses/>.
+
+ Author: Maciej Stachowiak <mjs@noisehavoc.org>
+*/
+
+#include <config.h>
+#include "nautilus-file-queue.h"
+
+#include <glib.h>
+
+struct NautilusFileQueue {
+ GList *head;
+ GList *tail;
+ GHashTable *item_to_link_map;
+};
+
+NautilusFileQueue *
+nautilus_file_queue_new (void)
+{
+ NautilusFileQueue *queue;
+
+ queue = g_new0 (NautilusFileQueue, 1);
+ queue->item_to_link_map = g_hash_table_new (g_direct_hash, g_direct_equal);
+
+ return queue;
+}
+
+void
+nautilus_file_queue_destroy (NautilusFileQueue *queue)
+{
+ g_hash_table_destroy (queue->item_to_link_map);
+ nautilus_file_list_free (queue->head);
+ g_free (queue);
+}
+
+void
+nautilus_file_queue_enqueue (NautilusFileQueue *queue,
+ NautilusFile *file)
+{
+ if (g_hash_table_lookup (queue->item_to_link_map, file) != NULL) {
+ /* It's already on the queue. */
+ return;
+ }
+
+ if (queue->tail == NULL) {
+ queue->head = g_list_append (NULL, file);
+ queue->tail = queue->head;
+ } else {
+ queue->tail = g_list_append (queue->tail, file);
+ queue->tail = queue->tail->next;
+ }
+
+ nautilus_file_ref (file);
+ g_hash_table_insert (queue->item_to_link_map, file, queue->tail);
+}
+
+NautilusFile *
+nautilus_file_queue_dequeue (NautilusFileQueue *queue)
+{
+ NautilusFile *file;
+
+ file = nautilus_file_queue_head (queue);
+ nautilus_file_queue_remove (queue, file);
+
+ return file;
+}
+
+
+void
+nautilus_file_queue_remove (NautilusFileQueue *queue,
+ NautilusFile *file)
+{
+ GList *link;
+
+ link = g_hash_table_lookup (queue->item_to_link_map, file);
+
+ if (link == NULL) {
+ /* It's not on the queue */
+ return;
+ }
+
+ if (link == queue->tail) {
+ /* Need to special-case removing the tail. */
+ queue->tail = queue->tail->prev;
+ }
+
+ queue->head = g_list_remove_link (queue->head, link);
+ g_list_free (link);
+ g_hash_table_remove (queue->item_to_link_map, file);
+
+ nautilus_file_unref (file);
+}
+
+NautilusFile *
+nautilus_file_queue_head (NautilusFileQueue *queue)
+{
+ if (queue->head == NULL) {
+ return NULL;
+ }
+
+ return NAUTILUS_FILE (queue->head->data);
+}
+
+gboolean
+nautilus_file_queue_is_empty (NautilusFileQueue *queue)
+{
+ return (queue->head == NULL);
+}