01: /**
02: * JDBM LICENSE v1.00
03: *
04: * Redistribution and use of this software and associated documentation
05: * ("Software"), with or without modification, are permitted provided
06: * that the following conditions are met:
07: *
08: * 1. Redistributions of source code must retain copyright
09: * statements and notices. Redistributions must also contain a
10: * copy of this document.
11: *
12: * 2. Redistributions in binary form must reproduce the
13: * above copyright notice, this list of conditions and the
14: * following disclaimer in the documentation and/or other
15: * materials provided with the distribution.
16: *
17: * 3. The name "JDBM" must not be used to endorse or promote
18: * products derived from this Software without prior written
19: * permission of Cees de Groot. For written permission,
20: * please contact cg@cdegroot.com.
21: *
22: * 4. Products derived from this Software may not be called "JDBM"
23: * nor may "JDBM" appear in their names without prior written
24: * permission of Cees de Groot.
25: *
26: * 5. Due credit should be given to the JDBM Project
27: * (http://jdbm.sourceforge.net/).
28: *
29: * THIS SOFTWARE IS PROVIDED BY THE JDBM PROJECT AND CONTRIBUTORS
30: * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
31: * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
32: * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
33: * CEES DE GROOT OR ANY CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
34: * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
35: * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
36: * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
38: * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
39: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
40: * OF THE POSSIBILITY OF SUCH DAMAGE.
41: *
42: * Copyright 2001 (C) Alex Boisvert. All Rights Reserved.
43: * Contributions are Copyright (C) 2001 by their associated contributors.
44: *
45: */package jdbm.helper;
46:
47: import java.io.Serializable;
48: import java.util.Comparator;
49:
50: /**
51: * Comparator for String objects. Delegates to String.compareTo().
52: *
53: * @author <a href="mailto:boisvert@intalio.com">Alex Boisvert</a>
54: * @version $Id: StringComparator.java,v 1.5 2005/06/25 23:12:31 doomdark Exp $
55: */
56: public final class StringComparator implements Comparator, Serializable {
57:
58: /**
59: * Version id for serialization.
60: */
61: final static long serialVersionUID = 1L;
62:
63: /**
64: * Compare two objects.
65: *
66: * @param obj1 First object
67: * @param obj2 Second object
68: * @return a positive integer if obj1 > obj2, 0 if obj1 == obj2,
69: * and a negative integer if obj1 < obj2
70: */
71: public int compare(Object obj1, Object obj2) {
72: if (obj1 == null) {
73: throw new IllegalArgumentException(
74: "Argument 'obj1' is null");
75: }
76:
77: if (obj2 == null) {
78: throw new IllegalArgumentException(
79: "Argument 'obj2' is null");
80: }
81:
82: return ((String) obj1).compareTo((String) obj2);
83: }
84:
85: }
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