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Java > Open Source Codes > com > jeantessier > commandline > OptionalValueSwitch


1 /*
2  * Copyright (c) 2001-2005, Jean Tessier
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
9  * * Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  *
12  * * Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in the
14  * documentation and/or other materials provided with the distribution.
15  *
16  * * Neither the name of Jean Tessier nor the names of his contributors
17  * may be used to endorse or promote products derived from this software
18  * without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR
24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  */
32
33 package com.jeantessier.commandline;
34
35 /**
36  * The switch can appear by itself or followed by a value. It can only
37  * appear once on the command-line.
38  */
39 public class OptionalValueSwitch extends CommandLineSwitchBase {
40     public OptionalValueSwitch() {
41         this("", false);
42     }
43
44     public OptionalValueSwitch(String JavaDoc defaultValue) {
45         this(defaultValue, false);
46     }
47
48     public OptionalValueSwitch(boolean mandatory) {
49         this("", mandatory);
50     }
51
52     public OptionalValueSwitch(String JavaDoc defaultValue, boolean mandatory) {
53         super(defaultValue, mandatory);
54     }
55
56     public int parse(String JavaDoc name, String JavaDoc value) throws CommandLineException {
57         int result = 1;
58
59         setValue(value);
60
61         if (value != null) {
62             result++;
63         }
64     
65         return result;
66     }
67
68     public void accept(Visitor visitor) {
69         visitor.visitOptionalValueSwitch(this);
70     }
71 }
72
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