path: root/e-util/e-list.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Authors: 
 *   Christopher James Lahey <clahey@umich.edu>
 *
 * Copyright (C) 2000 Helix Code, Inc.
 * Copyright (C) 1999 The Free Software Foundation
 */

#include <config.h>

#include "e-list.h"
#include "e-list-iterator.h"

#define ECL_CLASS(object) (E_LIST_CLASS(GTK_OBJECT((object))->klass))

static void e_list_init (EList *list);
static void e_list_class_init (EListClass *klass);
static void e_list_destroy (GtkObject *object);

#define PARENT_TYPE (gtk_object_get_type ())

static GtkObjectClass *parent_class;

/**
 * e_list_get_type:
 * @void: 
 * 
 * Registers the &EList class if necessary, and returns the type ID
 * associated to it.
 * 
 * Return value: The type ID of the &EList class.
 **/
GtkType
e_list_get_type (void)
{
    static GtkType type = 0;

    if (!type) {
        GtkTypeInfo info = {
            "EList",
            sizeof (EList),
            sizeof (EListClass),
            (GtkClassInitFunc) e_list_class_init,
            (GtkObjectInitFunc) e_list_init,
            NULL, /* reserved_1 */
            NULL, /* reserved_2 */
            (GtkClassInitFunc) NULL
        };

        type = gtk_type_unique (PARENT_TYPE, &info);
    }

    return type;
}

static void
e_list_class_init (EListClass *klass)
{
    GtkObjectClass *object_class;

    object_class = GTK_OBJECT_CLASS(klass);

    parent_class = gtk_type_class (PARENT_TYPE);

    object_class->destroy = e_list_destroy;
}

/**
 * e_list_init:
 */
static void
e_list_init (EList *list)
{
    list->list = NULL;
    list->iterators = NULL;
}

EList *
e_list_new          (EListCopyFunc copy, EListFreeFunc free, void *closure)
{
    EList *list = gtk_type_new(e_list_get_type());
    list->copy    = copy;
    list->free    = free;
    list->closure = closure;
    return list;
}

EList *
e_list_duplicate    (EList *old)
{
    EList *list = gtk_type_new(e_list_get_type());

    list->copy    = old->copy;
    list->free    = old->free;
    list->closure = old->closure;
    list->list    = g_list_copy(old->list);
    if (list->copy) {
        GList *listlist;
        for (listlist = list->list; listlist; listlist = listlist->next) {
            listlist->data = list->copy (listlist->data, list->closure);
        }
    }
    return list;
}

EIterator *
e_list_get_iterator (EList *list)
{
    EIterator *iterator = e_list_iterator_new(list);
    list->iterators = g_list_append(list->iterators, iterator);
    return iterator;
}

int
e_list_length (EList *list)
{
    return g_list_length(list->list);
}

void
e_list_append       (EList *list, const void *data)
{
    e_list_invalidate_iterators(list, NULL);
    if (list->copy)
        list->list = g_list_append(list->list, list->copy(data, list->closure));
    else
        list->list = g_list_append(list->list, (void *) data);
}

void
e_list_invalidate_iterators (EList *list, EIterator *skip)
{
    GList *iterators = list->iterators;
    for (; iterators; iterators = iterators->next) {
        if (iterators->data != skip) {
            e_iterator_invalidate(E_ITERATOR(iterators->data));
        }
    }
}

/* FIXME: This doesn't work properly if the iterator is the first
   iterator in the list.  Well, the iterator doesn't continue on after
   the next time next is called, at least. */
void
e_list_remove_link (EList *list, GList *link)
{
    GList *iterators = list->iterators;
    for (; iterators; iterators = iterators->next) {
        if (((EListIterator *)iterators->data)->iterator == link) {
            e_iterator_prev(iterators->data);
        }
    }
    if (list->free)
        list->free(link->data, list->closure);
    list->list = g_list_remove_link(list->list, link);
    g_list_free_1(link);
}

void
e_list_remove_iterator (EList *list, EIterator *iterator)
{
    list->iterators = g_list_remove(list->iterators, iterator);
}

/* 
 * Virtual functions 
 */
static void
e_list_destroy (GtkObject *object)
{
    EList *list = E_LIST(object);
    g_list_foreach(list->list, (GFunc) list->free, list->closure);
    g_list_free(list->list);
}