| /* |
| * 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. |
| */ |
| |
| package jdk.nashorn.internal.runtime.linker; |
| |
| import java.lang.reflect.Modifier; |
| import jdk.internal.dynalink.CallSiteDescriptor; |
| import jdk.internal.dynalink.beans.BeansLinker; |
| import jdk.internal.dynalink.beans.StaticClass; |
| import jdk.internal.dynalink.linker.GuardedInvocation; |
| import jdk.internal.dynalink.linker.GuardingDynamicLinker; |
| import jdk.internal.dynalink.linker.LinkRequest; |
| import jdk.internal.dynalink.linker.LinkerServices; |
| import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker; |
| import jdk.internal.dynalink.support.Guards; |
| import jdk.nashorn.internal.runtime.Context; |
| import jdk.nashorn.internal.runtime.ECMAErrors; |
| |
| /** |
| * Internal linker for {@link StaticClass} objects, only ever used by Nashorn engine and not exposed to other engines. |
| * It is used for extending the "new" operator on StaticClass in order to be able to instantiate interfaces and abstract |
| * classes by passing a ScriptObject or ScriptFunction as their implementation, e.g.: |
| * <pre> |
| * var r = new Runnable() { run: function() { print("Hello World" } } |
| * </pre> |
| * or for SAM types, even just passing a function: |
| * <pre> |
| * var r = new Runnable(function() { print("Hello World" }) |
| * </pre> |
| */ |
| final class NashornStaticClassLinker implements TypeBasedGuardingDynamicLinker { |
| private static final GuardingDynamicLinker staticClassLinker = BeansLinker.getLinkerForClass(StaticClass.class); |
| |
| @Override |
| public boolean canLinkType(final Class<?> type) { |
| return type == StaticClass.class; |
| } |
| |
| @Override |
| public GuardedInvocation getGuardedInvocation(final LinkRequest linkRequest, final LinkerServices linkerServices) throws Exception { |
| final LinkRequest request = linkRequest.withoutRuntimeContext(); // Nashorn has no runtime context |
| final Object self = request.getReceiver(); |
| if (self.getClass() != StaticClass.class) { |
| return null; |
| } |
| final Class<?> receiverClass = ((StaticClass) self).getRepresentedClass(); |
| |
| Bootstrap.checkReflectionAccess(receiverClass, true); |
| final CallSiteDescriptor desc = request.getCallSiteDescriptor(); |
| // We intercept "new" on StaticClass instances to provide additional capabilities |
| if ("new".equals(desc.getNameToken(CallSiteDescriptor.OPERATOR))) { |
| if (! Modifier.isPublic(receiverClass.getModifiers())) { |
| throw ECMAErrors.typeError("new.on.nonpublic.javatype", receiverClass.getName()); |
| } |
| |
| // make sure new is on accessible Class |
| Context.checkPackageAccess(receiverClass); |
| |
| // Is the class abstract? (This includes interfaces.) |
| if (NashornLinker.isAbstractClass(receiverClass)) { |
| // Change this link request into a link request on the adapter class. |
| final Object[] args = request.getArguments(); |
| args[0] = JavaAdapterFactory.getAdapterClassFor(new Class<?>[] { receiverClass }, null, |
| linkRequest.getCallSiteDescriptor().getLookup()); |
| final LinkRequest adapterRequest = request.replaceArguments(request.getCallSiteDescriptor(), args); |
| final GuardedInvocation gi = checkNullConstructor(delegate(linkerServices, adapterRequest), receiverClass); |
| // Finally, modify the guard to test for the original abstract class. |
| return gi.replaceMethods(gi.getInvocation(), Guards.getIdentityGuard(self)); |
| } |
| // If the class was not abstract, just delegate linking to the standard StaticClass linker. Make an |
| // additional check to ensure we have a constructor. We could just fall through to the next "return" |
| // statement, except we also insert a call to checkNullConstructor() which throws an ECMAScript TypeError |
| // with a more intuitive message when no suitable constructor is found. |
| return checkNullConstructor(delegate(linkerServices, request), receiverClass); |
| } |
| // In case this was not a "new" operation, just delegate to the the standard StaticClass linker. |
| return delegate(linkerServices, request); |
| } |
| |
| private static GuardedInvocation delegate(final LinkerServices linkerServices, final LinkRequest request) throws Exception { |
| return NashornBeansLinker.getGuardedInvocation(staticClassLinker, request, linkerServices); |
| } |
| |
| private static GuardedInvocation checkNullConstructor(final GuardedInvocation ctorInvocation, final Class<?> receiverClass) { |
| if(ctorInvocation == null) { |
| throw ECMAErrors.typeError("no.constructor.matches.args", receiverClass.getName()); |
| } |
| return ctorInvocation; |
| } |
| } |