1 /*
   2  * Copyright (c) 1997, 2012, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.istack.internal.tools;
  27 
  28 import java.util.Collection;
  29 
  30 /**
  31  * {@link ClassLoader} that masks a specified set of classes
  32  * from its parent class loader.
  33  *
  34  * <p>
  35  * This code is used to create an isolated environment.
  36  *
  37  * @author Kohsuke Kawaguchi
  38  */
  39 public class MaskingClassLoader extends ClassLoader {
  40 
  41     private final String[] masks;
  42 
  43     public MaskingClassLoader(String... masks) {
  44         this.masks = masks;
  45     }
  46 
  47     public MaskingClassLoader(Collection<String> masks) {
  48         this(masks.toArray(new String[masks.size()]));
  49     }
  50 
  51     public MaskingClassLoader(ClassLoader parent, String... masks) {
  52         super(parent);
  53         this.masks = masks;
  54     }
  55 
  56     public MaskingClassLoader(ClassLoader parent, Collection<String> masks) {
  57         this(parent, masks.toArray(new String[masks.size()]));
  58     }
  59 
  60     @Override
  61     protected synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
  62         for (String mask : masks) {
  63             if(name.startsWith(mask))
  64                 throw new ClassNotFoundException();
  65         }
  66 
  67         return super.loadClass(name, resolve);
  68     }
  69 }