MaskingClassLoader.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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).
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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);
    }
}