1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
#!/usr/bin/env -S java --source 11
/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2025 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU Lesser General Public License, as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any
* later version. Please see the file LICENSE-LGPL for details.
*
* Web Page: http://brltty.app/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
import java.io.File;
import java.util.Arrays;
import java.util.ArrayList;
/* This is the class that contains the main() method.
* Don't be misled by the fact that it seems to have a required name.
* It can actually have any name so we chose to give it a descriptive one.
* The only rule is that the main() method must be within the first class.
*/
public class ScriptImplementation extends ScriptHelper {
public static void main (String[] arguments) {
var operands = new ScriptOperands(arguments);
String action = operands.next();
if (action == null) syntaxError("action not specified");
switch (action) {
case "jvmpath": {
verifyNoMoreParameters(operands);
String path = getProcessInformation().command().orElse(null);
if (path != null) putScriptOutput("%s", path);
break;
}
default: {
syntaxError("unknown action: %s", action);
}
}
}
}
public class ScriptHelper {
public static ProcessHandle.Info getProcessInformation () {
return ProcessHandle.current().info();
}
public static String getScriptPath () {
String[] arguments = getProcessInformation().arguments().orElse(null);
if (arguments == null) return null;
final int index = 2;
if (arguments.length <= index) return null;
return arguments[index];
}
public static File getScriptFile () {
String path = getScriptPath();
if (path == null) return null;
return new File(path);
}
public static String getScriptName () {
File file = getScriptFile();
if (file == null) return null;
return file.getName();
}
public static void putScriptMessage (String format, Object... arguments) {
String message = String.format(format, arguments);
String tag = getScriptName();
if ((tag != null) && !tag.isEmpty()) {
String prefix = tag + ": ";
message = prefix + message;
prefix = " ".repeat(prefix.length());
message = message.replaceAll("(\n)", ("$1" + prefix));
}
System.err.println(message);
}
public static void syntaxError (String format, Object... arguments) {
putScriptMessage(format, arguments);
System.exit(2);
}
public static void putTooManyParameters () {
syntaxError("too many parameters");
}
public static void verifyNoMoreParameters (ScriptOperands operands) {
if (!operands.isEmpty()) putTooManyParameters();
}
public static void putScriptOutput (String format, Object... arguments) {
System.out.println(String.format(format, arguments));
}
}
public class ScriptOperands extends ArrayList<String> {
public ScriptOperands (String... operands) {
super(Arrays.asList(operands));
}
public String next () {
return isEmpty()? null: remove(0);
}
}
|
