gee/collection.vala

   1 /* collection.vala
   2  *
   3  * Copyright (C) 2007  Jürg Billeter
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  18  *
  19  * Author:
  20  *      Jürg Billeter <j@bitron.ch>
  21  */
  22
  23 /**
  24  * Serves as the base interface for implementing collection classes. Defines
  25  * size, iteration, and modification methods.
  26  */
  27 public abstract class Vala.Collection<G> : Iterable<G> {
  28         /**
  29          * The number of items in this collection.
  30          */
  31         public abstract int size { get; }
  32
  33         /**
  34          * Determines whether this collection contains the specified item.
  35          *
  36          * @param item the item to locate in the collection
  37          *
  38          * @return     true if item is found, false otherwise
  39          */
  40         public abstract bool contains (G item);
  41
  42         /**
  43          * Adds an item to this collection. Must not be called on read-only
  44          * collections.
  45          *
  46          * @param item the item to add to the collection
  47          *
  48          * @return     true if the collection has been changed, false otherwise
  49          */
  50         public abstract bool add (G item);
  51
  52         /**
  53          * Removes the first occurence of an item from this collection. Must not
  54          * be called on read-only collections.
  55          *
  56          * @param item the item to remove from the collection
  57          *
  58          * @return     true if the collection has been changed, false otherwise
  59          */
  60         public abstract bool remove (G item);
  61
  62         /**
  63          * Removes all items from this collection. Must not be called on
  64          * read-only collections.
  65          */
  66         public abstract void clear ();
  67 }
  68