path: root/e-util/e-list-iterator.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 <gtk/gtk.h>

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

static void e_list_iterator_init (EListIterator *list);
static void e_list_iterator_class_init (EListIteratorClass *klass);

static void e_list_iterator_invalidate (EIterator *iterator);
static gboolean e_list_iterator_is_valid (EIterator *iterator);
static void e_list_iterator_set      (EIterator *iterator,
                       const void    *object);
static void e_list_iterator_delete   (EIterator *iterator);
static gboolean e_list_iterator_prev     (EIterator *iterator);
static gboolean e_list_iterator_next     (EIterator *iterator);
static void e_list_iterator_reset    (EIterator *iterator);
static const void *e_list_iterator_get      (EIterator *iterator);
static void e_list_iterator_destroy (GtkObject *object);

#define PARENT_TYPE (e_iterator_get_type ())

static GtkObjectClass *parent_class;
#define PARENT_CLASS (E_LIST_ITERATOR_CLASS(parent_class))

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

    if (!type) {
        GtkTypeInfo info = {
            "EListIterator",
            sizeof (EListIterator),
            sizeof (EListIteratorClass),
            (GtkClassInitFunc) e_list_iterator_class_init,
            (GtkObjectInitFunc) e_list_iterator_init,
            NULL, /* reserved_1 */
            NULL, /* reserved_2 */
            (GtkClassInitFunc) NULL
        };

        type = gtk_type_unique (PARENT_TYPE, &info);
    }

    return type;
}

static void
e_list_iterator_class_init (EListIteratorClass *klass)
{
    GtkObjectClass *object_class;
    EIteratorClass *iterator_class;

    object_class = GTK_OBJECT_CLASS(klass);
    iterator_class = E_ITERATOR_CLASS(klass);

    parent_class = gtk_type_class (PARENT_TYPE);

    object_class->destroy = e_list_iterator_destroy;

    iterator_class->invalidate = e_list_iterator_invalidate;
    iterator_class->get        = e_list_iterator_get;
    iterator_class->reset      = e_list_iterator_reset;
    iterator_class->next       = e_list_iterator_next;
    iterator_class->prev       = e_list_iterator_prev;
    iterator_class->delete     = e_list_iterator_delete;
    iterator_class->set        = e_list_iterator_set;
    iterator_class->is_valid   = e_list_iterator_is_valid;
}



/**
 * e_list_iterator_init:
 */
static void
e_list_iterator_init (EListIterator *list)
{
}

EIterator *
e_list_iterator_new (EList *list)
{
    EListIterator *iterator = gtk_type_new(e_list_iterator_get_type());

    iterator->list = list;
    gtk_object_ref(GTK_OBJECT(list));
    iterator->iterator = list->list;

    return E_ITERATOR(iterator);
}

/*
 * Virtual functions: 
 */
static void
e_list_iterator_destroy (GtkObject *object)
{
    EListIterator *iterator = E_LIST_ITERATOR(object);
    e_list_remove_iterator(iterator->list, E_ITERATOR(iterator));
    gtk_object_unref(GTK_OBJECT(iterator->list));
}

static const void *
e_list_iterator_get      (EIterator *_iterator)
{
    EListIterator *iterator = E_LIST_ITERATOR(_iterator);
    if (iterator->iterator)
        return iterator->iterator->data;
    else
        return NULL;
}

static void
e_list_iterator_reset    (EIterator *_iterator)
{
    EListIterator *iterator = E_LIST_ITERATOR(_iterator);
    iterator->iterator = iterator->list->list;
}

static gboolean
e_list_iterator_next     (EIterator *_iterator)
{
    EListIterator *iterator = E_LIST_ITERATOR(_iterator);
    if (iterator->iterator)
        iterator->iterator = g_list_next(iterator->iterator);
    return (iterator->iterator != NULL);
}

static gboolean
e_list_iterator_prev     (EIterator *_iterator)
{
    EListIterator *iterator = E_LIST_ITERATOR(_iterator);
    if (iterator->iterator)
        iterator->iterator = g_list_previous(iterator->iterator);
    return (iterator->iterator != NULL);
}

static void
e_list_iterator_delete   (EIterator *_iterator)
{
    EListIterator *iterator = E_LIST_ITERATOR(_iterator);
    if (iterator->iterator) {
        GList *temp = iterator->iterator->next;
        if (iterator->list->free)
            iterator->list->free(iterator->iterator->data, iterator->list->closure);
        iterator->list->list = g_list_remove_link(iterator->list->list, iterator->iterator);
        iterator->iterator = temp;
        e_list_invalidate_iterators(iterator->list, E_ITERATOR(iterator));
    }
}

static void
e_list_iterator_set      (EIterator *_iterator,
                   const void    *object)
{
    EListIterator *iterator = E_LIST_ITERATOR(_iterator);
    if (iterator->iterator) {
        if (iterator->list->free)
            iterator->list->free(iterator->iterator->data, iterator->list->closure);
        if (iterator->list->copy)
            iterator->iterator->data = iterator->list->copy(object, iterator->list->closure);
        else
            iterator->iterator->data = (void *) object;
    }
}

static gboolean
e_list_iterator_is_valid (EIterator *_iterator)
{
    EListIterator *iterator = E_LIST_ITERATOR(_iterator);
    return iterator->iterator != NULL;
}

static void
e_list_iterator_invalidate (EIterator *_iterator)
{
    EListIterator *iterator = E_LIST_ITERATOR(_iterator);
    iterator->iterator = NULL;
}