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/*
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* Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang.invoke;
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import java.lang.reflect.*;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import sun.invoke.WrapperInstance;
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import java.util.ArrayList;
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//import sun.reflect.CallerSensitive;
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//import sun.reflect.Reflection;
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//import sun.reflect.misc.ReflectUtil;
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/**
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* This class consists exclusively of static methods that help adapt
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* method handles to other JVM types, such as interfaces.
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*/
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public class MethodHandleProxies {
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private MethodHandleProxies() { } // do not instantiate
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/**
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* Produces an instance of the given single-method interface which redirects
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* its calls to the given method handle.
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* <p>
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* A single-method interface is an interface which declares a uniquely named method.
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* When determining the uniquely named method of a single-method interface,
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* the public {@code Object} methods ({@code toString}, {@code equals}, {@code hashCode})
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* are disregarded. For example, {@link java.util.Comparator} is a single-method interface,
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* even though it re-declares the {@code Object.equals} method.
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* <p>
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* The interface must be public. No additional access checks are performed.
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* <p>
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* The resulting instance of the required type will respond to
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* invocation of the type's uniquely named method by calling
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* the given target on the incoming arguments,
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* and returning or throwing whatever the target
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* returns or throws. The invocation will be as if by
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* {@code target.invoke}.
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* The target's type will be checked before the
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* instance is created, as if by a call to {@code asType},
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* which may result in a {@code WrongMethodTypeException}.
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* <p>
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* The uniquely named method is allowed to be multiply declared,
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* with distinct type descriptors. (E.g., it can be overloaded,
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* or can possess bridge methods.) All such declarations are
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* connected directly to the target method handle.
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* Argument and return types are adjusted by {@code asType}
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* for each individual declaration.
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* <p>
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* The wrapper instance will implement the requested interface
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* and its super-types, but no other single-method interfaces.
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* This means that the instance will not unexpectedly
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* pass an {@code instanceof} test for any unrequested type.
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* <p style="font-size:smaller;">
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* <em>Implementation Note:</em>
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* Therefore, each instance must implement a unique single-method interface.
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* Implementations may not bundle together
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* multiple single-method interfaces onto single implementation classes
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* in the style of {@link java.awt.AWTEventMulticaster}.
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* <p>
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* The method handle may throw an <em>undeclared exception</em>,
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* which means any checked exception (or other checked throwable)
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* not declared by the requested type's single abstract method.
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* If this happens, the throwable will be wrapped in an instance of
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* {@link java.lang.reflect.UndeclaredThrowableException UndeclaredThrowableException}
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* and thrown in that wrapped form.
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* <p>
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* Like {@link java.lang.Integer#valueOf Integer.valueOf},
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* {@code asInterfaceInstance} is a factory method whose results are defined
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* by their behavior.
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* It is not guaranteed to return a new instance for every call.
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* <p>
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* Because of the possibility of {@linkplain java.lang.reflect.Method#isBridge bridge methods}
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* and other corner cases, the interface may also have several abstract methods
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* with the same name but having distinct descriptors (types of returns and parameters).
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* In this case, all the methods are bound in common to the one given target.
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* The type check and effective {@code asType} conversion is applied to each
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* method type descriptor, and all abstract methods are bound to the target in common.
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* Beyond this type check, no further checks are made to determine that the
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* abstract methods are related in any way.
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* <p>
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* Future versions of this API may accept additional types,
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* such as abstract classes with single abstract methods.
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* Future versions of this API may also equip wrapper instances
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* with one or more additional public "marker" interfaces.
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* <p>
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* If a security manager is installed, this method is caller sensitive.
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* During any invocation of the target method handle via the returned wrapper,
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* the original creator of the wrapper (the caller) will be visible
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* to context checks requested by the security manager.
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*
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* @param <T> the desired type of the wrapper, a single-method interface
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* @param intfc a class object representing {@code T}
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* @param target the method handle to invoke from the wrapper
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* @return a correctly-typed wrapper for the given target
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* @throws NullPointerException if either argument is null
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* @throws IllegalArgumentException if the {@code intfc} is not a
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* valid argument to this method
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* @throws WrongMethodTypeException if the target cannot
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* be converted to the type required by the requested interface
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*/
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// Other notes to implementors:
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// <p>
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// No stable mapping is promised between the single-method interface and
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// the implementation class C. Over time, several implementation
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// classes might be used for the same type.
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// <p>
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// If the implementation is able
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// to prove that a wrapper of the required type
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// has already been created for a given
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// method handle, or for another method handle with the
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// same behavior, the implementation may return that wrapper in place of
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// a new wrapper.
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// <p>
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// This method is designed to apply to common use cases
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// where a single method handle must interoperate with
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// an interface that implements a function-like
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// API. Additional variations, such as single-abstract-method classes with
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// private constructors, or interfaces with multiple but related
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// entry points, must be covered by hand-written or automatically
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// generated adapter classes.
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//
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// @CallerSensitive
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public static
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<T> T asInterfaceInstance(final Class<T> intfc, final MethodHandle target) {
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if (!intfc.isInterface() || !Modifier.isPublic(intfc.getModifiers()))
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throw new IllegalArgumentException("not a public interface: "+intfc.getName());
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final MethodHandle mh;
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if (false) {//System.getSecurityManager() != null) {
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// final Class<?> caller = Reflection.getCallerClass();
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// final ClassLoader ccl = caller != null ? caller.getClassLoader() : null;
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// ReflectUtil.checkProxyPackageAccess(ccl, intfc);
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// mh = ccl != null ? bindCaller(target, caller) : target;
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} else {
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mh = target;
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}
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ClassLoader proxyLoader = intfc.getClassLoader();
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if (proxyLoader == null) {
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ClassLoader cl = Thread.currentThread().getContextClassLoader(); // avoid use of BCP
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proxyLoader = cl != null ? cl : ClassLoader.getSystemClassLoader();
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}
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final Method[] methods = getSingleNameMethods(intfc);
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if (methods == null)
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throw new IllegalArgumentException("not a single-method interface: "+intfc.getName());
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final MethodHandle[] vaTargets = new MethodHandle[methods.length];
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for (int i = 0; i < methods.length; i++) {
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Method sm = methods[i];
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MethodType smMT = MethodType.methodType(sm.getReturnType(), sm.getParameterTypes());
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MethodHandle checkTarget = mh.asType(smMT); // make throw WMT
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checkTarget = checkTarget.asType(checkTarget.type().changeReturnType(Object.class));
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vaTargets[i] = checkTarget.asSpreader(Object[].class, smMT.parameterCount());
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}
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final InvocationHandler ih = new InvocationHandler() {
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private Object getArg(String name) {
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if ((Object)name == "getWrapperInstanceTarget") return target;
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if ((Object)name == "getWrapperInstanceType") return intfc;
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throw new AssertionError();
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}
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public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
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for (int i = 0; i < methods.length; i++) {
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if (method.equals(methods[i]))
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return vaTargets[i].invokeExact(args);
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}
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if (method.getDeclaringClass() == WrapperInstance.class)
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return getArg(method.getName());
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if (isObjectMethod(method))
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return callObjectMethod(proxy, method, args);
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throw new InternalError("bad proxy method: "+method);
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}
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};
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final Object proxy;
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if (false) { // System.getSecurityManager() != null) {
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// sun.invoke.WrapperInstance is a restricted interface not accessible
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// by any non-null class loader.
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final ClassLoader loader = proxyLoader;
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proxy = AccessController.doPrivileged(new PrivilegedAction<Object>() {
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public Object run() {
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return Proxy.newProxyInstance(
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loader,
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new Class<?>[]{ intfc, WrapperInstance.class },
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ih);
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}
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});
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} else {
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proxy = Proxy.newProxyInstance(proxyLoader,
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new Class<?>[]{ intfc, WrapperInstance.class },
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ih);
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}
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return intfc.cast(proxy);
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}
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private static MethodHandle bindCaller(MethodHandle target, Class<?> hostClass) {
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MethodHandle cbmh = MethodHandleImpl.bindCaller(target, hostClass);
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if (target.isVarargsCollector()) {
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MethodType type = cbmh.type();
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int arity = type.parameterCount();
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return cbmh.asVarargsCollector(type.parameterType(arity-1));
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}
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return cbmh;
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}
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/**
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* Determines if the given object was produced by a call to {@link #asInterfaceInstance asInterfaceInstance}.
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* @param x any reference
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* @return true if the reference is not null and points to an object produced by {@code asInterfaceInstance}
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*/
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public static
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boolean isWrapperInstance(Object x) {
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return x instanceof WrapperInstance;
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}
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private static WrapperInstance asWrapperInstance(Object x) {
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try {
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if (x != null)
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return (WrapperInstance) x;
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} catch (ClassCastException ex) {
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}
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throw new IllegalArgumentException("not a wrapper instance");
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}
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/**
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* Produces or recovers a target method handle which is behaviorally
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* equivalent to the unique method of this wrapper instance.
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* The object {@code x} must have been produced by a call to {@link #asInterfaceInstance asInterfaceInstance}.
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* This requirement may be tested via {@link #isWrapperInstance isWrapperInstance}.
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* @param x any reference
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* @return a method handle implementing the unique method
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* @throws IllegalArgumentException if the reference x is not to a wrapper instance
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*/
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public static
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MethodHandle wrapperInstanceTarget(Object x) {
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return asWrapperInstance(x).getWrapperInstanceTarget();
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}
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/**
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* Recovers the unique single-method interface type for which this wrapper instance was created.
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* The object {@code x} must have been produced by a call to {@link #asInterfaceInstance asInterfaceInstance}.
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* This requirement may be tested via {@link #isWrapperInstance isWrapperInstance}.
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* @param x any reference
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* @return the single-method interface type for which the wrapper was created
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* @throws IllegalArgumentException if the reference x is not to a wrapper instance
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*/
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public static
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Class<?> wrapperInstanceType(Object x) {
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return asWrapperInstance(x).getWrapperInstanceType();
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}
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private static
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boolean isObjectMethod(Method m) {
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switch (m.getName()) {
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case "toString":
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return (m.getReturnType() == String.class
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&& m.getParameterTypes().length == 0);
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case "hashCode":
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return (m.getReturnType() == int.class
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&& m.getParameterTypes().length == 0);
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case "equals":
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return (m.getReturnType() == boolean.class
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&& m.getParameterTypes().length == 1
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&& m.getParameterTypes()[0] == Object.class);
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jaroslav@1646
|
286 |
}
|
jaroslav@1646
|
287 |
return false;
|
jaroslav@1646
|
288 |
}
|
jaroslav@1646
|
289 |
|
jaroslav@1646
|
290 |
private static
|
jaroslav@1646
|
291 |
Object callObjectMethod(Object self, Method m, Object[] args) {
|
jaroslav@1646
|
292 |
assert(isObjectMethod(m)) : m;
|
jaroslav@1646
|
293 |
switch (m.getName()) {
|
jaroslav@1646
|
294 |
case "toString":
|
jaroslav@1646
|
295 |
return self.getClass().getName() + "@" + Integer.toHexString(self.hashCode());
|
jaroslav@1646
|
296 |
case "hashCode":
|
jaroslav@1646
|
297 |
return System.identityHashCode(self);
|
jaroslav@1646
|
298 |
case "equals":
|
jaroslav@1646
|
299 |
return (self == args[0]);
|
jaroslav@1646
|
300 |
}
|
jaroslav@1646
|
301 |
return null;
|
jaroslav@1646
|
302 |
}
|
jaroslav@1646
|
303 |
|
jaroslav@1646
|
304 |
private static
|
jaroslav@1646
|
305 |
Method[] getSingleNameMethods(Class<?> intfc) {
|
jaroslav@1646
|
306 |
ArrayList<Method> methods = new ArrayList<Method>();
|
jaroslav@1646
|
307 |
String uniqueName = null;
|
jaroslav@1646
|
308 |
for (Method m : intfc.getMethods()) {
|
jaroslav@1646
|
309 |
if (isObjectMethod(m)) continue;
|
jaroslav@1646
|
310 |
if (!Modifier.isAbstract(m.getModifiers())) continue;
|
jaroslav@1646
|
311 |
String mname = m.getName();
|
jaroslav@1646
|
312 |
if (uniqueName == null)
|
jaroslav@1646
|
313 |
uniqueName = mname;
|
jaroslav@1646
|
314 |
else if (!uniqueName.equals(mname))
|
jaroslav@1646
|
315 |
return null; // too many abstract methods
|
jaroslav@1646
|
316 |
methods.add(m);
|
jaroslav@1646
|
317 |
}
|
jaroslav@1646
|
318 |
if (uniqueName == null) return null;
|
jaroslav@1646
|
319 |
return methods.toArray(new Method[methods.size()]);
|
jaroslav@1646
|
320 |
}
|
jaroslav@1646
|
321 |
}
|