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88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; 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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*/
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/**
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* SECTION:gstfilter
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* @short_description: A utility function to filter GLists.
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*
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* <example>
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* <title>Filtering a list</title>
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* <programlisting>
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* GList *node;
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* GstObject *result = NULL;
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*
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* node = gst_filter_run (list, (GstFilterFunc) my_filter, TRUE, NULL);
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* if (node) {
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* result = GST_OBJECT (node->data);
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* gst_object_ref (result);
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* g_list_free (node);
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* }
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* </programlisting>
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* </example>
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*/
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#include "gst_private.h"
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#include <gst/gstfilter.h>
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/**
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* gst_filter_run:
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* @list: a linked list
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* @func: the function to execute for each item
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* @first: flag to stop execution after a successful item
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* @user_data: user data
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*
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* Iterates over the elements in @list, calling @func with the
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* list item data for each item. If @func returns TRUE, @data is
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* prepended to the list of results returned. If @first is true,
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* the search is halted after the first result is found.
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*
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* Since gst_filter_run() knows nothing about the type of @data, no
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* reference will be taken (if @data refers to an object) and no copy of
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* @data wil be made in any other way when prepending @data to the list of
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* results.
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*
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* Returns: the list of results. Free with g_list_free() when no longer needed
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* (the data contained in the list is a flat copy and does need to be
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* unreferenced or freed).
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*/
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GList *
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gst_filter_run (const GList * list, GstFilterFunc func, gboolean first,
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gpointer user_data)
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{
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const GList *walk = list;
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GList *result = NULL;
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while (walk) {
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gboolean res = TRUE;
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gpointer data = walk->data;
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walk = g_list_next (walk);
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if (func)
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res = func (data, user_data);
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if (res) {
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result = g_list_prepend (result, data);
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if (first)
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break;
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}
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}
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return result;
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}
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