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Java > Open Source Codes > com > db4o > ext > ExtObjectSet


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.ext;
22
23 import com.db4o.*;
24
25 /**
26  * extended functionality for the
27  * {@link ObjectSet ObjectSet} interface.
28  * <br><br>Every db4o {@link ObjectSet ObjectSet}
29  * always is an ExtObjectSet so a cast is possible.<br><br>
30  * {@link ObjectSet#ext}
31  * is a convenient method to perform the cast.<br><br>
32  * The ObjectSet functionality is split to two interfaces to allow newcomers to
33  * focus on the essential methods.
34  */
35 public interface ExtObjectSet extends ObjectSet {
36     
37     /**
38      * returns an array of internal IDs that correspond to the contained objects.
39      * <br><br>
40      * @see ExtObjectContainer#getID
41      * @see ExtObjectContainer#getByID
42      */
43     public long[] getIDs();
44     
45     /**
46      * returns the item at position [index] in this ObjectSet.
47      * <br><br>
48      * The object will be activated.
49      * @param index the index position in this ObjectSet.
50      * @return the activated object.
51      */
52     public Object JavaDoc get(int index);
53     
54     // public void sort(QueryComparator cmp);
55 }
56
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