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/*
* Copyright (c) 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.
*/
import java.util.*;
import java.io.*;
public class PreemptingChildClassLoader extends ParentClassLoader {
private static ClassLoader p = new ParentClassLoader();
private final Set<String> names = new HashSet<>();
boolean checkLoaded = true;
public PreemptingChildClassLoader(String... names) {
for (String n : names) this.names.add(n);
}
public PreemptingChildClassLoader(String name, String[] names) {
super(name, p);
for (String n : names) this.names.add(n);
}
public PreemptingChildClassLoader(String name, String[] names, boolean cL) {
super(name, p);
for (String n : names) this.names.add(n);
checkLoaded = cL;
}
protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
if (!names.contains(name)) return super.loadClass(name, resolve);
Class<?> result = checkLoaded ? findLoadedClass(name) : null;
if (result == null) {
String filename = name.replace('.', '/') + ".class";
try (InputStream data = getResourceAsStream(filename)) {
if (data == null) throw new ClassNotFoundException();
try (ByteArrayOutputStream buffer = new ByteArrayOutputStream()) {
int b;
do {
b = data.read();
if (b >= 0) buffer.write(b);
} while (b >= 0);
byte[] bytes = buffer.toByteArray();
result = defineClass(name, bytes, 0, bytes.length);
}
} catch (IOException e) {
throw new ClassNotFoundException("Error reading class file", e);
}
}
if (resolve) resolveClass(result);
return result;
}
}
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