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) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package nsk.share.classload;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.FileInputStream;
import java.util.Arrays;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.Files;
public class ClassLoadUtils {
private ClassLoadUtils() {
}
/**
* Get filename of class file from classpath for given class name.
*
* @param className class name
* @return filename or null if not found
*/
public static String getClassPath(String className) {
String fileName = className.replace(".", File.separator) + ".class";
String[] classPath = System.getProperty("java.class.path").split(File.pathSeparator);
File target = null;
int i;
for (i = 0; i < classPath.length; ++i) {
target = new File(classPath[i] + File.separator + fileName);
System.out.println("Try: " + target);
if (target.exists()) {
break;
}
}
if (i != classPath.length) {
return classPath[i];
}
return null;
}
/**
* Get filename of class file from classpath for given class name.
*
* @param className class name
* @return filename or null if not found
*/
public static String getClassPathFileName(String className) {
String fileName = className.replace(".", File.separator) + ".class";
String[] classPath = System.getProperty("java.class.path").split(File.pathSeparator);
File target = null;
int i;
for (i = 0; i < classPath.length; ++i) {
target = new File(classPath[i] + File.separator + fileName);
System.out.println("Try: " + target);
if (target.exists()) {
break;
}
}
if (i != classPath.length) {
try {
return target.getCanonicalPath();
} catch (IOException e) {
return null;
}
}
return null;
}
public static String getRedefineClassFileName(String dir, String className) {
String fileName = className.replace(".", File.separator) + ".class";
return Arrays.stream(System.getProperty("java.class.path").split(File.pathSeparator))
.map(Paths::get)
.map(p -> p.resolve(dir))
.map(p -> p.resolve(fileName))
.filter(p -> Files.exists(p))
.map(Path::toAbsolutePath)
.map(Path::toString)
.findAny()
.orElse(null);
}
/**
* Get filename of class file which is to be redefined.
*/
public static String getRedefineClassFileName(String className) {
return getRedefineClassFileName("newclass", className);
}
}
|
