/*

 * Copyright (c) 2010, 2013, 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

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 * 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

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 *

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 *

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/*

 * This file is available under and governed by the GNU General Public

 * License version 2 only, as published by the Free Software Foundation.

 * However, the following notice accompanied the original version of this

 * file, and Oracle licenses the original version of this file under the BSD

 * license:

 */

/*

   Copyright 2009-2013 Attila Szegedi

   Redistribution and use in source and binary forms, with or without

   modification, are permitted provided that the following conditions are

   met:

   * Redistributions of source code must retain the above copyright

     notice, this list of conditions and the following disclaimer.

   * Redistributions in binary form must reproduce the above copyright

     notice, this list of conditions and the following disclaimer in the

     documentation and/or other materials provided with the distribution.

   * Neither the name of the copyright holder nor the names of

     contributors may be used to endorse or promote products derived from

     this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

   IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED

   TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

   PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER

   BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR

   BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

   OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

   ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

package jdk.dynalink.linker;

import jdk.dynalink.DynamicLinkerFactory;

/**

 * Interface for objects that are used to transform one guarded invocation into

 * another one. Typical usage is for implementing

 * {@link DynamicLinkerFactory#setPrelinkTransformer(GuardedInvocationTransformer)

 * pre-link transformers}.

 */

@FunctionalInterface

public interface GuardedInvocationTransformer {

    /**

     * Given a guarded invocation, return either the same or potentially

     * different guarded invocation.

     * @param inv the original guarded invocation.

     * @param linkRequest the link request for which the invocation was

     * generated (usually by some linker).

     * @param linkerServices the linker services that can be used during

     * creation of a new invocation.

     * @return either the passed guarded invocation or a different one, with

     * the difference usually determined based on information in the link

     * request and the differing invocation created with the assistance of the

     * linker services. Whether or not {@code null} is an accepted return value

     * is dependent on the user of the filter.

     * @throws NullPointerException is allowed to be thrown by implementations

     * if any of the passed arguments is null.

     */

    public GuardedInvocation filter(GuardedInvocation inv, LinkRequest linkRequest, LinkerServices linkerServices);

}