/*

 * Copyright (c) 1997, 2010, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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

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 */

package com.sun.istack.internal.tools;

import java.util.Collection;

/**

 * {@link ClassLoader} that masks a specified set of classes

 * from its parent class loader.

 *

 * <p>

 * This code is used to create an isolated environment.

 *

 * @author Kohsuke Kawaguchi

 */

public class MaskingClassLoader extends ClassLoader {

    private final String[] masks;

    public MaskingClassLoader(String... masks) {

        this.masks = masks;

    }

    public MaskingClassLoader(Collection<String> masks) {

        this(masks.toArray(new String[masks.size()]));

    }

    public MaskingClassLoader(ClassLoader parent, String... masks) {

        super(parent);

        this.masks = masks;

    }

    public MaskingClassLoader(ClassLoader parent, Collection<String> masks) {

        this(parent, masks.toArray(new String[masks.size()]));

    }

    @Override

    protected synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {

        for (String mask : masks) {

            if(name.startsWith(mask))

                throw new ClassNotFoundException();

        }

        return super.loadClass(name, resolve);

    }

}