libedataserver/e-list-iterator.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
   2 /*
   3  * Authors:
   4  *   Christopher James Lahey <clahey@umich.edu>
   5  *
   6  * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
   7  */
   8
   9 #include <config.h>
  10
  11 #include "e-list-iterator.h"
  12 #include "e-list.h"
  13
  14 static void        e_list_iterator_invalidate (EIterator *iterator);
  15 static gboolean    e_list_iterator_is_valid   (EIterator *iterator);
  16 static void        e_list_iterator_set        (EIterator  *iterator,
  17                                                gconstpointer object);
  18 static void        e_list_iterator_remove     (EIterator  *iterator);
  19 static void        e_list_iterator_insert     (EIterator  *iterator,
  20                                                gconstpointer object,
  21                                                gboolean    before);
  22 static gboolean    e_list_iterator_prev       (EIterator  *iterator);
  23 static gboolean    e_list_iterator_next       (EIterator  *iterator);
  24 static void        e_list_iterator_reset      (EIterator *iterator);
  25 static void        e_list_iterator_last       (EIterator *iterator);
  26 static gconstpointer e_list_iterator_get        (EIterator *iterator);
  27 static void        e_list_iterator_dispose    (GObject *object);
  28
  29 G_DEFINE_TYPE (EListIterator, e_list_iterator, E_TYPE_ITERATOR)
  30
  31 static void
  32 e_list_iterator_class_init (EListIteratorClass *class)
  33 {
  34         GObjectClass *object_class;
  35         EIteratorClass *iterator_class;
  36
  37         object_class = G_OBJECT_CLASS (class);
  38         object_class->dispose = e_list_iterator_dispose;
  39
  40         iterator_class = E_ITERATOR_CLASS (class);
  41         iterator_class->invalidate = e_list_iterator_invalidate;
  42         iterator_class->get        = e_list_iterator_get;
  43         iterator_class->reset      = e_list_iterator_reset;
  44         iterator_class->last       = e_list_iterator_last;
  45         iterator_class->next       = e_list_iterator_next;
  46         iterator_class->prev       = e_list_iterator_prev;
  47         iterator_class->remove     = e_list_iterator_remove;
  48         iterator_class->insert     = e_list_iterator_insert;
  49         iterator_class->set        = e_list_iterator_set;
  50         iterator_class->is_valid   = e_list_iterator_is_valid;
  51 }
  52
  53 /**
  54  * e_list_iterator_init:
  55  */
  56 static void
  57 e_list_iterator_init (EListIterator *list)
  58 {
  59 }
  60
  61 EIterator *
  62 e_list_iterator_new (EList *list)
  63 {
  64         EListIterator *iterator = NULL;
  65
  66         g_return_val_if_fail (list != NULL, NULL);
  67         g_return_val_if_fail (E_IS_LIST (list), NULL);
  68
  69         iterator = g_object_new (E_TYPE_LIST_ITERATOR, NULL);
  70         if (!iterator)
  71                 return NULL;
  72         iterator->list = list;
  73         g_object_ref (list);
  74         iterator->iterator = list->list;
  75
  76         return E_ITERATOR (iterator);
  77 }
  78
  79 /*
  80  * Virtual functions:
  81  */
  82 static void
  83 e_list_iterator_dispose (GObject *object)
  84 {
  85         EListIterator *iterator = E_LIST_ITERATOR (object);
  86         e_list_remove_iterator (iterator->list, E_ITERATOR (iterator));
  87         g_object_unref (iterator->list);
  88
  89         /* Chain up to parent's dispose() method. */
  90         G_OBJECT_CLASS (e_list_iterator_parent_class)->dispose (object);
  91 }
  92
  93 static gconstpointer
  94 e_list_iterator_get (EIterator *_iterator)
  95 {
  96         EListIterator *iterator = E_LIST_ITERATOR (_iterator);
  97         if (iterator->iterator)
  98                 return iterator->iterator->data;
  99         else
 100                 return NULL;
 101 }
 102
 103 static void
 104 e_list_iterator_reset (EIterator *_iterator)
 105 {
 106         EListIterator *iterator = E_LIST_ITERATOR (_iterator);
 107         iterator->iterator = iterator->list->list;
 108 }
 109
 110 static void
 111 e_list_iterator_last (EIterator *_iterator)
 112 {
 113         EListIterator *iterator = E_LIST_ITERATOR (_iterator);
 114         iterator->iterator = g_list_last (iterator->list->list);
 115 }
 116
 117 static gboolean
 118 e_list_iterator_next (EIterator *_iterator)
 119 {
 120         EListIterator *iterator = E_LIST_ITERATOR (_iterator);
 121         if (iterator->iterator)
 122                 iterator->iterator = g_list_next (iterator->iterator);
 123         else
 124                 iterator->iterator = iterator->list->list;
 125         return (iterator->iterator != NULL);
 126 }
 127
 128 static gboolean
 129 e_list_iterator_prev (EIterator *_iterator)
 130 {
 131         EListIterator *iterator = E_LIST_ITERATOR (_iterator);
 132         if (iterator->iterator)
 133                 iterator->iterator = g_list_previous (iterator->iterator);
 134         else
 135                 iterator->iterator = g_list_last (iterator->list->list);
 136         return (iterator->iterator != NULL);
 137 }
 138
 139 static void
 140 e_list_iterator_insert (EIterator *_iterator,
 141                         gconstpointer object,
 142                         gboolean before)
 143 {
 144         EListIterator *iterator = E_LIST_ITERATOR (_iterator);
 145         gpointer data;
 146         if (iterator->list->copy)
 147                 data = iterator->list->copy (object, iterator->list->closure);
 148         else
 149                 data = (gpointer) object;
 150         if (iterator->iterator) {
 151                 if (before) {
 152                         iterator->list->list = g_list_first (g_list_prepend (iterator->iterator, data));
 153                         iterator->iterator = iterator->iterator->prev;
 154                 } else {
 155                         if (iterator->iterator->next)
 156                                 iterator->iterator->next = g_list_prepend (iterator->iterator->next, data);
 157                         else
 158                                 iterator->iterator = g_list_append (iterator->iterator, data);
 159                         iterator->iterator = iterator->iterator->next;
 160                 }
 161                 e_list_invalidate_iterators (iterator->list, E_ITERATOR (iterator));
 162         } else {
 163                 if (before) {
 164                         iterator->list->list = g_list_append (iterator->list->list, data);
 165                         iterator->iterator = g_list_last (iterator->list->list);
 166                 } else {
 167                         iterator->list->list = g_list_prepend (iterator->list->list, data);
 168                         iterator->iterator = iterator->list->list;
 169                 }
 170                 e_list_invalidate_iterators (iterator->list, E_ITERATOR (iterator));
 171         }
 172 }
 173
 174 static void
 175 e_list_iterator_remove (EIterator *_iterator)
 176 {
 177         EListIterator *iterator = E_LIST_ITERATOR (_iterator);
 178         if (iterator->iterator) {
 179                 e_list_remove_link (iterator->list, iterator->iterator);
 180         }
 181 }
 182
 183 static void
 184 e_list_iterator_set (EIterator *_iterator,
 185                      gconstpointer object)
 186 {
 187         EListIterator *iterator = E_LIST_ITERATOR (_iterator);
 188         if (iterator->iterator) {
 189                 if (iterator->list->free)
 190                         iterator->list->free (iterator->iterator->data, iterator->list->closure);
 191                 if (iterator->list->copy)
 192                         iterator->iterator->data = iterator->list->copy (object, iterator->list->closure);
 193                 else
 194                         iterator->iterator->data = (gpointer) object;
 195         }
 196 }
 197
 198 static gboolean
 199 e_list_iterator_is_valid (EIterator *_iterator)
 200 {
 201         EListIterator *iterator = E_LIST_ITERATOR (_iterator);
 202         return iterator->iterator != NULL;
 203 }
 204
 205 static void
 206 e_list_iterator_invalidate (EIterator *_iterator)
 207 {
 208         EListIterator *iterator = E_LIST_ITERATOR (_iterator);
 209         iterator->iterator = NULL;
 210 }