1 /*

     2  * Copyright (c) 1997, 2013, 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 }