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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);
}
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