01: /* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com
02:
03: This file is part of the db4o open source object database.
04:
05: db4o is free software; you can redistribute it and/or modify it under
06: the terms of version 2 of the GNU General Public License as published
07: by the Free Software Foundation and as clarified by db4objects' GPL
08: interpretation policy, available at
09: 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 get(int index);
53:
54: // public void sort(QueryComparator cmp);
55: }
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