readonlycollection.vala 1.89 KB
Newer Older
1 2
/* readonlycollection.vala
 *
3
 * Copyright (C) 2007-2008  Jürg Billeter
4 5 6 7
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * 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 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.

 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 *
 * Author:
 * 	Jürg Billeter <j@bitron.ch>
 */

using GLib;

/**
 * Represents a read-only collection of items.
 */
28
public class Gee.ReadOnlyCollection<G> : CollectionObject, Iterable<G>, Collection<G> {
29 30 31 32 33 34 35 36 37 38
	public int size {
		get { return _collection.size; }
	}

	public Collection<G> collection {
		set { _collection = value; }
	}

	private Collection<G> _collection;

39
	public ReadOnlyCollection (Collection<G>? collection = null) {
40
		this.collection = collection;
41 42
	}

43 44 45 46
	public Type get_element_type () {
		return typeof (G);
	}

47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74
	public Gee.Iterator<G> iterator () {
		if (_collection == null) {
			return new Iterator<G> ();
		}

		return _collection.iterator ();
	}

	public bool contains (G item) {
		if (_collection == null) {
			return false;
		}

		return _collection.contains (item);
	}

	public bool add (G item) {
		assert_not_reached ();
	}

	public bool remove (G item) {
		assert_not_reached ();
	}

	public void clear () {
		assert_not_reached ();
	}

75
	private class Iterator<G> : CollectionObject, Gee.Iterator<G> {
76 77 78 79
		public bool next () {
			return false;
		}

80
		public G? get () {
81 82 83 84 85
			return null;
		}
	}
}