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/*
* Copyright (c) 2015, 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.io.IOException;
import java.net.URL;
import java.util.Enumeration;
import java.lang.System.LoggerFinder;
/**
* A custom class loader which can hide the registered LoggerProvider
* depending on the value of a test.logger.hidesProvider system property.
* @author danielfuchs
*/
public class SystemClassLoader extends ClassLoader {
final public boolean hidesProvider;
public SystemClassLoader() {
hidesProvider = Boolean.getBoolean("test.logger.hidesProvider");
}
public SystemClassLoader(ClassLoader parent) {
super(parent);
hidesProvider = Boolean.getBoolean("test.logger.hidesProvider");
}
boolean accept(String name) {
final boolean res = !name.endsWith(LoggerFinder.class.getName());
if (res == false) {
System.out.println("Hiding " + name);
}
return res;
}
@Override
public URL getResource(String name) {
if (hidesProvider && !accept(name)) {
return null;
} else {
return super.getResource(name);
}
}
class Enumerator implements Enumeration<URL> {
final Enumeration<URL> enumeration;
volatile URL next;
Enumerator(Enumeration<URL> enumeration) {
this.enumeration = enumeration;
}
@Override
public boolean hasMoreElements() {
if (next != null) return true;
if (!enumeration.hasMoreElements()) return false;
if (hidesProvider == false) return true;
next = enumeration.nextElement();
if (accept(next.getPath())) return true;
next = null;
return hasMoreElements();
}
@Override
public URL nextElement() {
final URL res = next == null ? enumeration.nextElement() : next;
next = null;
if (hidesProvider == false || accept(res.getPath())) return res;
return nextElement();
}
}
@Override
public Enumeration<URL> getResources(String name) throws IOException {
final Enumeration<URL> enumeration = super.getResources(name);
return hidesProvider ? new Enumerator(enumeration) : enumeration;
}
}
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