1 /*

     2  * Copyright (c) 2011, 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 sun.dyn;

    27 

    28 import java.dyn.MethodHandle;

    29 

    30 /**

    31  * Private API used inside of java.dyn.MethodHandles.

    32  * Interface implemented by every object which is produced by

    33  * {@link java.dyn.MethodHandles#asInstance MethodHandles.asInstance}.

    34  * The methods of this interface allow a caller to recover the parameters

    35  * to {@code asInstance}.

    36  * This allows applications to repeatedly convert between method handles

    37  * and SAM objects, without the risk of creating unbounded delegation chains.

    38  */

    39 public interface WrapperInstance {

    40     /** Produce or recover a target method handle which is behaviorally

    41      *  equivalent to the SAM method of this object.

    42      */

    43     public MethodHandle getWrapperInstanceTarget();

    44     /** Recover the SAM type for which this object was created.

    45      */

    46     public Class<?> getWrapperInstanceType();

    47 }

    48