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/*
 * Copyright (C) 2014 XStream Committers.
 * All rights reserved.
 *
 * Created on 09. January 2014 by Joerg Schaible
 */
package com.feilong.lib.xstream.security;

/**
 * Wrapper to negate another type permission.
 * 
 * If the wrapped {@link TypePermission} allows the type, this instance will throw a {@link ForbiddenClassException}
 * instead. An instance of this permission cannot be used to allow a type.
 * 
 * 
 * @author Jörg Schaible
 * @since 1.4.7
 */
public class NoPermission implements TypePermission{

    private final TypePermission permission;

    /**
     * Construct a NoPermission.
     * 
     * @param permission
     *            the permission to negate or null to forbid any type
     * @since 1.4.7
     */
    public NoPermission(final TypePermission permission){
        this.permission = permission;
    }

    @Override
    public boolean allows(final Class type){
        if (permission == null || permission.allows(type)){
            throw new ForbiddenClassException(type);
        }
        return false;
    }
}