1 /*
   2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package jdk.testlibrary;
  24 
  25 import java.util.function.Predicate;
  26 /**
  27  * A classloader, which using target classloader in case provided condition
  28  * for class name is met, and using parent otherwise
  29  */
  30 public class FilterClassLoader extends ClassLoader {
  31 
  32     private final ClassLoader target;
  33     private final Predicate<String> condition;
  34 
  35     public FilterClassLoader(ClassLoader target, ClassLoader parent,
  36             Predicate<String> condition) {
  37         super(parent);
  38         this.condition = condition;
  39         this.target = target;
  40     }
  41 
  42     @Override
  43     public Class<?> loadClass(String name) throws ClassNotFoundException {
  44         if (condition.test(name)) {
  45             return target.loadClass(name);
  46         }
  47         return super.loadClass(name);
  48     }
  49 }