rt/emul/compact/src/main/java/sun/invoke/WrapperInstance.java
author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
Sat, 09 Aug 2014 11:11:13 +0200
branchjdk8-b132
changeset 1646 c880a8a8803b
permissions -rw-r--r--
Batch of classes necessary to implement invoke dynamic interfaces. Taken from JDK8 build 132
     1 /*
     2  * Copyright (c) 2011, 2013, 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.invoke;
    27 
    28 import java.lang.invoke.MethodHandle;
    29 
    30 /**
    31  * Private API used inside of java.lang.invoke.MethodHandles.
    32  * Interface implemented by every object which is produced by
    33  * {@link java.lang.invoke.MethodHandleProxies#asInterfaceInstance MethodHandleProxies.asInterfaceInstance}.
    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