-
Notifications
You must be signed in to change notification settings - Fork 33
/
Debug.java
111 lines (100 loc) · 4.26 KB
/
Debug.java
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
/*
* Copyright (c) 2000, 2017 Oracle and/or its affiliates. All rights reserved.
* Copyright 2021, 2022 Contributors to the Eclipse Foundation
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.messaging.jmq.util;
import java.util.Properties;
import java.util.Enumeration;
import java.lang.reflect.Field;
public class Debug {
public static final String debugFieldName = "DEBUG";
/**
* Set the DEBUG flag on the specified class. The DEBUG field is assumed to be declared:
*
* <pre>
* public static boolean DEBUG;
* </pre>
*
* @param className Fully qualified classname to set DEBUG on
* @param debug Value to set DEBUG to
*
*
* @throws ClassNotFoundException if class is not found
* @throws NoSuchFieldException if DEBUG field is not found in class
* @throws IllegalArgumentException
*/
public static void setDebug(String className, boolean debug)
throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException {
Class cl = Class.forName(className);
Field[] fields = cl.getDeclaredFields();
for (int i = 0; i < fields.length; i++) {
if (fields[i].getName().equals(debugFieldName)) {
fields[i].setAccessible(true);
fields[i].setBoolean(null, debug);
return;
}
}
throw new NoSuchFieldException(debugFieldName);
}
/**
* Set the DEBUG flag on the classes specified by values in a a Properties object. The Properties object should contain
* a series of properties of the format:
*
* <pre>{@code
* <prefix>.<classname>=true|false
* }</pre>
*
* This method will set the DEBUG flag on {@literal <classname>} to the specified value. For example if "jmq.debug." is the prefix
* then
*
* <pre>
* jmq.debug.com.sun.messaging.jmq.jmsserver.data.AcknowledgeList = true
* </pre>
*
* Will set com.sun.messaging.jmq.jmsserver.data.AcknowledgeList.DEBUG to true.
* <p>
* If an error occurs when processing the properties further processing stops and the appropriate exception is thrown.
*
* @param props Properties object containing entries to set DEBUG on
* @param prefix String that the prefixes each classname. If a property does not begin with this string then it is
* ignored.
*
* @throws ClassNotFoundException if class is not found
* @throws NoSuchFieldException if DEBUG field is not found in class
*/
public static void setDebug(Properties props, String prefix) throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException {
// Scan through properties
for (Enumeration e = props.propertyNames(); e.hasMoreElements();) {
String key = (String) e.nextElement();
// Find properties that match prefix
if (key.startsWith(prefix)) {
// Get className and value and set debug
String className = key.substring(prefix.length());
if (className.length() != 0) {
String value = props.getProperty(key);
if (value != null && value.length() != 0) {
try {
setDebug(className, (Boolean.valueOf(value)).booleanValue());
} catch (NoSuchFieldException ex) {
throw new NoSuchFieldException(className + "." + debugFieldName);
} catch (IllegalAccessException ex) {
throw new IllegalAccessException(className + "." + debugFieldName);
}
}
}
}
}
}
}