1 /*

     2  * Copyright (c) 2010, 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 /*

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

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

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

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

    31  * license:

    32  */

    33 /*

    34    Copyright 2009-2013 Attila Szegedi

    35 

    36    Licensed under both the Apache License, Version 2.0 (the "Apache License")

    37    and the BSD License (the "BSD License"), with licensee being free to

    38    choose either of the two at their discretion.

    39 

    40    You may not use this file except in compliance with either the Apache

    41    License or the BSD License.

    42 

    43    If you choose to use this file in compliance with the Apache License, the

    44    following notice applies to you:

    45 

    46        You may obtain a copy of the Apache License at

    47 

    48            http://www.apache.org/licenses/LICENSE-2.0

    49 

    50        Unless required by applicable law or agreed to in writing, software

    51        distributed under the License is distributed on an "AS IS" BASIS,

    52        WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or

    53        implied. See the License for the specific language governing

    54        permissions and limitations under the License.

    55 

    56    If you choose to use this file in compliance with the BSD License, the

    57    following notice applies to you:

    58 

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

    60        modification, are permitted provided that the following conditions are

    61        met:

    62        * Redistributions of source code must retain the above copyright

    63          notice, this list of conditions and the following disclaimer.

    64        * Redistributions in binary form must reproduce the above copyright

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

    66          documentation and/or other materials provided with the distribution.

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

    68          contributors may be used to endorse or promote products derived from

    69          this software without specific prior written permission.

    70 

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

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

    73        TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

    74        PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER

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

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

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

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

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

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

    81        ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    82 */

    83 

    84 package jdk.dynalink.beans;

    85 

    86 import java.lang.invoke.MethodHandle;

    87 import java.lang.invoke.MethodHandles;

    88 import java.lang.invoke.MethodType;

    89 import java.lang.reflect.AccessibleObject;

    90 import java.lang.reflect.Constructor;

    91 import java.lang.reflect.Member;

    92 import java.lang.reflect.Method;

    93 import java.lang.reflect.Modifier;

    94 import java.security.AccessControlContext;

    95 import java.security.AccessController;

    96 import java.security.PrivilegedAction;

    97 import jdk.dynalink.CallSiteDescriptor;

    98 import jdk.dynalink.internal.AccessControlContextFactory;

    99 import jdk.dynalink.linker.support.Lookup;

   100 

   101 /**

   102  * A dynamic method bound to exactly one Java method or constructor that is caller sensitive. Since the target method is

   103  * caller sensitive, it doesn't cache a method handle but rather uses the passed lookup object in

   104  * {@link #getTarget(CallSiteDescriptor)} to unreflect a method handle from the reflective member on

   105  * every request.

   106  */

   107 class CallerSensitiveDynamicMethod extends SingleDynamicMethod {

   108     private static final AccessControlContext GET_LOOKUP_CONTEXT =

   109             AccessControlContextFactory.createAccessControlContext(

   110                     CallSiteDescriptor.GET_LOOKUP_PERMISSION_NAME);

   111 

   112     // Typed as "AccessibleObject" as it can be either a method or a constructor.

   113     // If we were Java8-only, we could use java.lang.reflect.Executable

   114     private final AccessibleObject target;

   115     private final MethodType type;

   116 

   117     CallerSensitiveDynamicMethod(final AccessibleObject target) {

   118         super(getName(target));

   119         this.target = target;

   120         this.type = getMethodType(target);

   121     }

   122 

   123     private static String getName(final AccessibleObject target) {

   124         final Member m = (Member)target;

   125         final boolean constructor = m instanceof Constructor;

   126         return getMethodNameWithSignature(getMethodType(target), constructor ? m.getName() :

   127             getClassAndMethodName(m.getDeclaringClass(), m.getName()), !constructor);

   128     }

   129 

   130     @Override

   131     MethodType getMethodType() {

   132         return type;

   133     }

   134 

   135     private static MethodType getMethodType(final AccessibleObject ao) {

   136         final boolean isMethod = ao instanceof Method;

   137         final Class<?> rtype = isMethod ? ((Method)ao).getReturnType() : ((Constructor<?>)ao).getDeclaringClass();

   138         final Class<?>[] ptypes = isMethod ? ((Method)ao).getParameterTypes() : ((Constructor<?>)ao).getParameterTypes();

   139         final MethodType type = MethodType.methodType(rtype, ptypes);

   140         final Member m = (Member)ao;

   141         return type.insertParameterTypes(0,

   142                 isMethod ?

   143                         Modifier.isStatic(m.getModifiers()) ?

   144                                 Object.class :

   145                                 m.getDeclaringClass() :

   146                         StaticClass.class);

   147     }

   148 

   149     @Override

   150     boolean isVarArgs() {

   151         return target instanceof Method ? ((Method)target).isVarArgs() : ((Constructor<?>)target).isVarArgs();

   152     }

   153 

   154     @Override

   155     MethodHandle getTarget(final CallSiteDescriptor desc) {

   156         final MethodHandles.Lookup lookup = AccessController.doPrivileged(

   157                 (PrivilegedAction<MethodHandles.Lookup>)()->desc.getLookup(),

   158                 GET_LOOKUP_CONTEXT);

   159 

   160         if(target instanceof Method) {

   161             final MethodHandle mh = Lookup.unreflect(lookup, (Method)target);

   162             if(Modifier.isStatic(((Member)target).getModifiers())) {

   163                 return StaticClassIntrospector.editStaticMethodHandle(mh);

   164             }

   165             return mh;

   166         }

   167         return StaticClassIntrospector.editConstructorMethodHandle(Lookup.unreflectConstructor(lookup,

   168                 (Constructor<?>)target));

   169     }

   170 

   171     @Override

   172     boolean isConstructor() {

   173         return target instanceof Constructor;

   174     }

   175 }