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.internal.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.Array;

    90 import java.util.Arrays;

    91 import java.util.Set;

    92 import jdk.internal.dynalink.CallSiteDescriptor;

    93 import jdk.internal.dynalink.NamedOperation;

    94 import jdk.internal.dynalink.StandardOperation;

    95 import jdk.internal.dynalink.beans.GuardedInvocationComponent.ValidationType;

    96 import jdk.internal.dynalink.linker.GuardedInvocation;

    97 import jdk.internal.dynalink.linker.LinkRequest;

    98 import jdk.internal.dynalink.linker.LinkerServices;

    99 import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker;

   100 import jdk.internal.dynalink.linker.support.Lookup;

   101 

   102 /**

   103  * Provides a linker for the {@link StaticClass} objects.

   104  */

   105 class StaticClassLinker implements TypeBasedGuardingDynamicLinker {

   106     private static final ClassValue<SingleClassStaticsLinker> linkers = new ClassValue<SingleClassStaticsLinker>() {

   107         @Override

   108         protected SingleClassStaticsLinker computeValue(final Class<?> clazz) {

   109             return new SingleClassStaticsLinker(clazz);

   110         }

   111     };

   112 

   113     private static class SingleClassStaticsLinker extends AbstractJavaLinker {

   114         private final DynamicMethod constructor;

   115 

   116         SingleClassStaticsLinker(final Class<?> clazz) {

   117             super(clazz, IS_CLASS.bindTo(clazz));

   118             // Map "staticClassObject.class" to StaticClass.getRepresentedClass(). Some adventurous soul could subclass

   119             // StaticClass, so we use INSTANCE_OF validation instead of EXACT_CLASS.

   120             setPropertyGetter("class", GET_CLASS, ValidationType.INSTANCE_OF);

   121             constructor = createConstructorMethod(clazz);

   122         }

   123 

   124         /**

   125          * Creates a dynamic method containing all overloads of a class' public constructor

   126          * @param clazz the target class

   127          * @return a dynamic method containing all overloads of a class' public constructor. If the class has no public

   128          * constructors, returns null.

   129          */

   130         private static DynamicMethod createConstructorMethod(final Class<?> clazz) {

   131             if(clazz.isArray()) {

   132                 final MethodHandle boundArrayCtor = ARRAY_CTOR.bindTo(clazz.getComponentType());

   133                 return new SimpleDynamicMethod(StaticClassIntrospector.editConstructorMethodHandle(

   134                         boundArrayCtor.asType(boundArrayCtor.type().changeReturnType(clazz))), clazz, "<init>");

   135             }

   136             if(CheckRestrictedPackage.isRestrictedClass(clazz)) {

   137                 return null;

   138             }

   139             return createDynamicMethod(Arrays.asList(clazz.getConstructors()), clazz, "<init>");

   140         }

   141 

   142         @Override

   143         FacetIntrospector createFacetIntrospector() {

   144             return new StaticClassIntrospector(clazz);

   145         }

   146 

   147         @Override

   148         public GuardedInvocation getGuardedInvocation(final LinkRequest request, final LinkerServices linkerServices)

   149                 throws Exception {

   150             final GuardedInvocation gi = super.getGuardedInvocation(request, linkerServices);

   151             if(gi != null) {

   152                 return gi;

   153             }

   154             final CallSiteDescriptor desc = request.getCallSiteDescriptor();

   155             if(NamedOperation.getBaseOperation(desc.getOperation()) == StandardOperation.NEW && constructor != null) {

   156                 final MethodHandle ctorInvocation = constructor.getInvocation(desc, linkerServices);

   157                 if(ctorInvocation != null) {

   158                     return new GuardedInvocation(ctorInvocation, getClassGuard(desc.getMethodType()));

   159                 }

   160             }

   161             return null;

   162         }

   163 

   164         @Override

   165         SingleDynamicMethod getConstructorMethod(final String signature) {

   166             return constructor != null? constructor.getMethodForExactParamTypes(signature) : null;

   167         }

   168     }

   169 

   170     static Object getConstructorMethod(final Class<?> clazz, final String signature) {

   171         return linkers.get(clazz).getConstructorMethod(signature);

   172     }

   173 

   174     static Set<String> getReadableStaticPropertyNames(final Class<?> clazz) {

   175         return linkers.get(clazz).getReadablePropertyNames();

   176     }

   177 

   178     static Set<String> getWritableStaticPropertyNames(final Class<?> clazz) {

   179         return linkers.get(clazz).getWritablePropertyNames();

   180     }

   181 

   182     static Set<String> getStaticMethodNames(final Class<?> clazz) {

   183         return linkers.get(clazz).getMethodNames();

   184     }

   185 

   186     @Override

   187     public GuardedInvocation getGuardedInvocation(final LinkRequest request, final LinkerServices linkerServices) throws Exception {

   188         final Object receiver = request.getReceiver();

   189         if(receiver instanceof StaticClass) {

   190             return linkers.get(((StaticClass)receiver).getRepresentedClass()).getGuardedInvocation(request,

   191                     linkerServices);

   192         }

   193         return null;

   194     }

   195 

   196     @Override

   197     public boolean canLinkType(final Class<?> type) {

   198         return type == StaticClass.class;

   199     }

   200 

   201     /*private*/ static final MethodHandle GET_CLASS;

   202     /*private*/ static final MethodHandle IS_CLASS;

   203     /*private*/ static final MethodHandle ARRAY_CTOR = Lookup.PUBLIC.findStatic(Array.class, "newInstance",

   204             MethodType.methodType(Object.class, Class.class, int.class));

   205 

   206     static {

   207         final Lookup lookup = new Lookup(MethodHandles.lookup());

   208         GET_CLASS = lookup.findVirtual(StaticClass.class, "getRepresentedClass", MethodType.methodType(Class.class));

   209         IS_CLASS = lookup.findOwnStatic("isClass", Boolean.TYPE, Class.class, Object.class);

   210     }

   211 

   212     @SuppressWarnings("unused")

   213     private static boolean isClass(final Class<?> clazz, final Object obj) {

   214         return obj instanceof StaticClass && ((StaticClass)obj).getRepresentedClass() == clazz;

   215     }

   216 }