diff -r 000000000000 -r b1a7da25b547 src/jdk/internal/dynalink/beans/StaticClassLinker.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/jdk/internal/dynalink/beans/StaticClassLinker.java Wed Apr 27 01:36:41 2016 +0800 @@ -0,0 +1,207 @@ +/* + * 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 + * under the terms of the GNU General Public License version 2 only, as + * 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 + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +/* + * 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 + + Licensed under both the Apache License, Version 2.0 (the "Apache License") + and the BSD License (the "BSD License"), with licensee being free to + choose either of the two at their discretion. + + You may not use this file except in compliance with either the Apache + License or the BSD License. + + If you choose to use this file in compliance with the Apache License, the + following notice applies to you: + + You may obtain a copy of the Apache License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or + implied. See the License for the specific language governing + permissions and limitations under the License. + + If you choose to use this file in compliance with the BSD License, the + following notice applies to you: + + 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.internal.dynalink.beans; + +import java.lang.invoke.MethodHandle; +import java.lang.invoke.MethodHandles; +import java.lang.invoke.MethodType; +import java.lang.reflect.Array; +import java.util.Arrays; +import java.util.Collection; +import jdk.internal.dynalink.CallSiteDescriptor; +import jdk.internal.dynalink.beans.GuardedInvocationComponent.ValidationType; +import jdk.internal.dynalink.linker.GuardedInvocation; +import jdk.internal.dynalink.linker.LinkRequest; +import jdk.internal.dynalink.linker.LinkerServices; +import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker; +import jdk.internal.dynalink.support.Lookup; + +/** + * Provides a linker for the {@link StaticClass} objects. + * @author Attila Szegedi + */ +class StaticClassLinker implements TypeBasedGuardingDynamicLinker { + private static final ClassValue linkers = new ClassValue() { + @Override + protected SingleClassStaticsLinker computeValue(Class clazz) { + return new SingleClassStaticsLinker(clazz); + } + }; + + private static class SingleClassStaticsLinker extends AbstractJavaLinker { + private final DynamicMethod constructor; + + SingleClassStaticsLinker(Class clazz) { + super(clazz, IS_CLASS.bindTo(clazz)); + // Map "staticClassObject.class" to StaticClass.getRepresentedClass(). Some adventurous soul could subclass + // StaticClass, so we use INSTANCE_OF validation instead of EXACT_CLASS. + setPropertyGetter("class", GET_CLASS, ValidationType.INSTANCE_OF); + constructor = createConstructorMethod(clazz); + } + + /** + * Creates a dynamic method containing all overloads of a class' public constructor + * @param clazz the target class + * @return a dynamic method containing all overloads of a class' public constructor. If the class has no public + * constructors, returns null. + */ + private static DynamicMethod createConstructorMethod(Class clazz) { + if(clazz.isArray()) { + final MethodHandle boundArrayCtor = ARRAY_CTOR.bindTo(clazz.getComponentType()); + return new SimpleDynamicMethod(StaticClassIntrospector.editConstructorMethodHandle( + boundArrayCtor.asType(boundArrayCtor.type().changeReturnType(clazz))), clazz, ""); + } + if(CheckRestrictedPackage.isRestrictedClass(clazz)) { + return null; + } + return createDynamicMethod(Arrays.asList(clazz.getConstructors()), clazz, ""); + } + + @Override + FacetIntrospector createFacetIntrospector() { + return new StaticClassIntrospector(clazz); + } + + @Override + public GuardedInvocation getGuardedInvocation(LinkRequest request, LinkerServices linkerServices) + throws Exception { + final GuardedInvocation gi = super.getGuardedInvocation(request, linkerServices); + if(gi != null) { + return gi; + } + final CallSiteDescriptor desc = request.getCallSiteDescriptor(); + final String op = desc.getNameToken(CallSiteDescriptor.OPERATOR); + if("new" == op && constructor != null) { + final MethodHandle ctorInvocation = constructor.getInvocation(desc, linkerServices); + if(ctorInvocation != null) { + return new GuardedInvocation(ctorInvocation, getClassGuard(desc.getMethodType())); + } + } + return null; + } + } + + static Collection getReadableStaticPropertyNames(Class clazz) { + return linkers.get(clazz).getReadablePropertyNames(); + } + + static Collection getWritableStaticPropertyNames(Class clazz) { + return linkers.get(clazz).getWritablePropertyNames(); + } + + static Collection getStaticMethodNames(Class clazz) { + return linkers.get(clazz).getMethodNames(); + } + + @Override + public GuardedInvocation getGuardedInvocation(LinkRequest request, LinkerServices linkerServices) throws Exception { + final Object receiver = request.getReceiver(); + if(receiver instanceof StaticClass) { + return linkers.get(((StaticClass)receiver).getRepresentedClass()).getGuardedInvocation(request, + linkerServices); + } + return null; + } + + @Override + public boolean canLinkType(Class type) { + return type == StaticClass.class; + } + + /*private*/ static final MethodHandle GET_CLASS; + /*private*/ static final MethodHandle IS_CLASS; + /*private*/ static final MethodHandle ARRAY_CTOR = Lookup.PUBLIC.findStatic(Array.class, "newInstance", + MethodType.methodType(Object.class, Class.class, int.class)); + + static { + final Lookup lookup = new Lookup(MethodHandles.lookup()); + GET_CLASS = lookup.findVirtual(StaticClass.class, "getRepresentedClass", MethodType.methodType(Class.class)); + IS_CLASS = lookup.findOwnStatic("isClass", Boolean.TYPE, Class.class, Object.class); + } + + @SuppressWarnings("unused") + private static boolean isClass(Class clazz, Object obj) { + return obj instanceof StaticClass && ((StaticClass)obj).getRepresentedClass() == clazz; + } +}