1 files changed, 130 insertions, 0 deletions
diff --git a/src/nautilus-file-queue.c b/src/nautilus-file-queue.c
new file mode 100644
index 0000000..026ded1
--- /dev/null
+++ b/src/nautilus-file-queue.c
@@ -0,0 +1,130 @@
+/*
+ *  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);
+}