1 /*
   2  * Copyright (c) 2014, 2017, 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 
  24 package jdk.test.lib.classloader;
  25 
  26 import java.util.function.Predicate;
  27 /**
  28  * A classloader, which using target classloader in case provided condition
  29  * for class name is met, and using parent otherwise
  30  */
  31 public class FilterClassLoader extends ClassLoader {
  32 
  33     private final ClassLoader target;
  34     private final Predicate<String> condition;
  35 
  36     public FilterClassLoader(ClassLoader target, ClassLoader parent,
  37             Predicate<String> condition) {
  38         super(parent);
  39         this.condition = condition;
  40         this.target = target;
  41     }
  42 
  43     @Override
  44     public Class<?> loadClass(String name) throws ClassNotFoundException {
  45         if (condition.test(name)) {
  46             return target.loadClass(name);
  47         }
  48         return super.loadClass(name);
  49     }
  50 }