01: /***************************************************************
02: * This file is part of the [fleXive](R) project.
03: *
04: * Copyright (c) 1999-2008
05: * UCS - unique computing solutions gmbh (http://www.ucs.at)
06: * All rights reserved
07: *
08: * The [fleXive](R) project is free software; you can redistribute
09: * it and/or modify it under the terms of the GNU General Public
10: * License as published by the Free Software Foundation;
11: * either version 2 of the License, or (at your option) any
12: * later version.
13: *
14: * The GNU General Public License can be found at
15: * http://www.gnu.org/copyleft/gpl.html.
16: * A copy is found in the textfile GPL.txt and important notices to the
17: * license from the author are found in LICENSE.txt distributed with
18: * these libraries.
19: *
20: * This library is distributed in the hope that it will be useful,
21: * but WITHOUT ANY WARRANTY; without even the implied warranty of
22: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23: * GNU General Public License for more details.
24: *
25: * For further information about UCS - unique computing solutions gmbh,
26: * please see the company website: http://www.ucs.at
27: *
28: * For further information about [fleXive](R), please see the
29: * project website: http://www.flexive.org
30: *
31: *
32: * This copyright notice MUST APPEAR in all copies of the file!
33: ***************************************************************/package com.flexive.shared.search.query;
34:
35: import com.flexive.shared.ObjectWithLabel;
36: import com.flexive.shared.value.FxString;
37:
38: /**
39: * Comparator for query values
40: *
41: * @author Daniel Lichtenberger (daniel.lichtenberger@flexive.com), UCS - unique computing solutions gmbh (http://www.ucs.at)
42: * @version $Rev: 181 $
43: */
44: public interface ValueComparator extends ObjectWithLabel {
45: /**
46: * Returns true if the comparator needs a value ("right-hand-side"). For example,
47: * equality needs a value to compare to, while "is null" does not.
48: *
49: * @return true if the comparator needs a value ("right-hand-side").
50: */
51: boolean isNeedsInput();
52:
53: /**
54: * Return the label to be displayed to the user.
55: *
56: * @return the label to be displayed to the user.
57: */
58: FxString getLabel();
59:
60: }
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