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Java > Open Source Codes > com > db4o > foundation > List4


1 /* Copyright (C) 2004 - 2006 db4objects Inc. http://www.db4o.com
2
3 This file is part of the db4o open source object database.
4
5 db4o is free software; you can redistribute it and/or modify it under
6 the terms of version 2 of the GNU General Public License as published
7 by the Free Software Foundation and as clarified by db4objects' GPL
8 interpretation policy, available at
9 http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10 Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11 Suite 350, San Mateo, CA 94403, USA.
12
13 db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 package com.db4o.foundation;
22
23 import com.db4o.types.*;
24
25 /**
26  * elements in linked list Collection4
27  *
28  * @exclude
29  */
30 public final class List4 implements Unversioned
31 {
32     // TODO: encapsulate field access
33 /**
34      * next element in list
35      */
36     public List4 _next;
37     
38     /**
39      * carried object
40      */
41     public Object JavaDoc _element;
42     
43     /**
44      * db4o constructor to be able to store objects of this class
45      */
46     public List4() {}
47     
48     public List4(Object JavaDoc element) {
49         _element = element;
50     }
51
52     public List4(List4 next, Object JavaDoc element) {
53         _next = next;
54         _element = element;
55     }
56
57     boolean holds(Object JavaDoc obj) {
58         if(obj == null){
59             return _element == null;
60         }
61         return obj.equals(_element);
62     }
63     
64
65     
66 }
67
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