117 lines
3.9 KiB
Java
117 lines
3.9 KiB
Java
/*
|
|
* Copyright (c) 2003, 2023, 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;
|
|
|
|
import java.io.*;
|
|
|
|
/**
|
|
* The <code>CustomClassLoader</code> class is used in <code>ClassUnloader</code>.
|
|
*
|
|
* <p>This class loader can load classes and notify <code>ClassUnloader</code>
|
|
* about own finalization to make sure that all loaded classes have been unloaded.
|
|
*
|
|
* <p>By default this class loader loads class from .class file located in directory
|
|
* specified with <code>setClassPath()</code> method. To use any other technique
|
|
* of class loading one should implement derived class, which would override
|
|
* <code>findClass</code> method.
|
|
*
|
|
* @see nsk.share.ClassUnloader
|
|
*
|
|
* @see #setClassPath(String)
|
|
* @see #findClass(String)
|
|
*/
|
|
public class CustomClassLoader extends ClassLoader {
|
|
|
|
protected String classPath;
|
|
|
|
/**
|
|
* Initializes a newly created <code>CustomClassloader</code> object
|
|
* not yet linked with any <code>ClassUnloader</code> object.
|
|
*
|
|
*/
|
|
public CustomClassLoader() {
|
|
super(CustomClassLoader.class.getClassLoader());
|
|
}
|
|
|
|
/**
|
|
* Specifies path to .class file location.
|
|
*
|
|
* @param classPath a path to .class file location
|
|
*/
|
|
public void setClassPath(String classPath) {
|
|
this.classPath = classPath;
|
|
}
|
|
|
|
/**
|
|
* Finds and loads class for specified class name.
|
|
* This method loads class from .class file located in a directory
|
|
* previously specified by <code>setClassPath()</code>.
|
|
*
|
|
* @param name The name of the class.
|
|
*
|
|
* @throws ClassNotFoundException if no .class file found
|
|
* for specified class name
|
|
*
|
|
* @see #setClassPath(String)
|
|
*/
|
|
protected synchronized Class findClass(String name) throws ClassNotFoundException {
|
|
java.nio.file.Path path = ClassFileFinder.findClassFile(name, classPath);
|
|
if (path == null) {
|
|
throw new ClassNotFoundException(name);
|
|
}
|
|
String classFileName = path.toString();
|
|
|
|
FileInputStream in;
|
|
try {
|
|
in = new FileInputStream(classFileName);
|
|
if (in == null) {
|
|
throw new ClassNotFoundException(classFileName);
|
|
}
|
|
} catch (FileNotFoundException e) {
|
|
throw new ClassNotFoundException(classFileName, e);
|
|
}
|
|
|
|
int len;
|
|
byte data[];
|
|
try {
|
|
len = in.available();
|
|
data = new byte[len];
|
|
for (int total = 0; total < data.length; ) {
|
|
total += in.read(data, total, data.length - total);
|
|
}
|
|
} catch (IOException e) {
|
|
throw new ClassNotFoundException(classFileName, e);
|
|
} finally {
|
|
try {
|
|
in.close();
|
|
} catch (IOException e) {
|
|
throw new ClassNotFoundException(classFileName, e);
|
|
}
|
|
}
|
|
|
|
return defineClass(name, data, 0, data.length);
|
|
}
|
|
|
|
}
|