| /* |
| * 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. |
| * |
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| * 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.dynalink.linker.support; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodHandles; |
| import java.lang.invoke.MethodType; |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.Executable; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.Method; |
| |
| /** |
| * A wrapper around {@link java.lang.invoke.MethodHandles.Lookup} that masks |
| * checked exceptions. It is useful in those cases when you're looking up |
| * methods within your own codebase (therefore it is an error if they are not |
| * present). |
| */ |
| public final class Lookup { |
| private final MethodHandles.Lookup lookup; |
| |
| /** |
| * Creates a new instance, bound to an instance of |
| * {@link java.lang.invoke.MethodHandles.Lookup}. |
| * |
| * @param lookup the {@link java.lang.invoke.MethodHandles.Lookup} it delegates to. |
| */ |
| public Lookup(final MethodHandles.Lookup lookup) { |
| this.lookup = lookup; |
| } |
| |
| /** |
| * A canonical Lookup object that wraps {@link MethodHandles#publicLookup()}. |
| */ |
| public static final Lookup PUBLIC = new Lookup(MethodHandles.publicLookup()); |
| |
| /** |
| * Performs a {@link java.lang.invoke.MethodHandles.Lookup#unreflect(Method)}, |
| * converting any encountered {@link IllegalAccessException} into an |
| * {@link IllegalAccessError}. |
| * |
| * @param m the method to unreflect |
| * @return the unreflected method handle. |
| * @throws IllegalAccessError if the method is inaccessible. |
| */ |
| public MethodHandle unreflect(final Method m) { |
| return unreflect(lookup, m); |
| } |
| |
| /** |
| * Performs a {@link java.lang.invoke.MethodHandles.Lookup#unreflect(Method)}, |
| * converting any encountered {@link IllegalAccessException} into an |
| * {@link IllegalAccessError}. |
| * |
| * @param lookup the lookup used to unreflect |
| * @param m the method to unreflect |
| * @return the unreflected method handle. |
| * @throws IllegalAccessError if the method is inaccessible. |
| */ |
| public static MethodHandle unreflect(final MethodHandles.Lookup lookup, final Method m) { |
| try { |
| return lookup.unreflect(m); |
| } catch(final IllegalAccessException e) { |
| final IllegalAccessError ee = new IllegalAccessError("Failed to unreflect method " + m); |
| ee.initCause(e); |
| throw ee; |
| } |
| } |
| |
| /** |
| * Performs a {@link java.lang.invoke.MethodHandles.Lookup#unreflectGetter(Field)}, |
| * converting any encountered {@link IllegalAccessException} into an {@link IllegalAccessError}. |
| * |
| * @param f the field for which a getter is unreflected |
| * @return the unreflected field getter handle. |
| * @throws IllegalAccessError if the getter is inaccessible. |
| */ |
| public MethodHandle unreflectGetter(final Field f) { |
| try { |
| return lookup.unreflectGetter(f); |
| } catch(final IllegalAccessException e) { |
| final IllegalAccessError ee = new IllegalAccessError("Failed to unreflect getter for field " + f); |
| ee.initCause(e); |
| throw ee; |
| } |
| } |
| |
| /** |
| * Performs a {@link java.lang.invoke.MethodHandles.Lookup#findGetter(Class, String, Class)}, |
| * converting any encountered {@link IllegalAccessException} into an |
| * {@link IllegalAccessError} and {@link NoSuchFieldException} into a |
| * {@link NoSuchFieldError}. |
| * |
| * @param refc the class declaring the field |
| * @param name the name of the field |
| * @param type the type of the field |
| * @return the unreflected field getter handle. |
| * @throws IllegalAccessError if the field is inaccessible. |
| * @throws NoSuchFieldError if the field does not exist. |
| */ |
| public MethodHandle findGetter(final Class<?>refc, final String name, final Class<?> type) { |
| try { |
| return lookup.findGetter(refc, name, type); |
| } catch(final IllegalAccessException e) { |
| final IllegalAccessError ee = new IllegalAccessError("Failed to access getter for field " + refc.getName() + |
| "." + name + " of type " + type.getName()); |
| ee.initCause(e); |
| throw ee; |
| } catch(final NoSuchFieldException e) { |
| final NoSuchFieldError ee = new NoSuchFieldError("Failed to find getter for field " + refc.getName() + |
| "." + name + " of type " + type.getName()); |
| ee.initCause(e); |
| throw ee; |
| } |
| } |
| |
| /** |
| * Performs a {@link java.lang.invoke.MethodHandles.Lookup#unreflectSetter(Field)}, |
| * converting any encountered {@link IllegalAccessException} into an |
| * {@link IllegalAccessError}. |
| * |
| * @param f the field for which a setter is unreflected |
| * @return the unreflected field setter handle. |
| * @throws IllegalAccessError if the field is inaccessible. |
| * @throws NoSuchFieldError if the field does not exist. |
| */ |
| public MethodHandle unreflectSetter(final Field f) { |
| try { |
| return lookup.unreflectSetter(f); |
| } catch(final IllegalAccessException e) { |
| final IllegalAccessError ee = new IllegalAccessError("Failed to unreflect setter for field " + f); |
| ee.initCause(e); |
| throw ee; |
| } |
| } |
| |
| /** |
| * Performs a {@link java.lang.invoke.MethodHandles.Lookup#unreflectConstructor(Constructor)}, |
| * converting any encountered {@link IllegalAccessException} into an |
| * {@link IllegalAccessError}. |
| * |
| * @param c the constructor to unreflect |
| * @return the unreflected constructor handle. |
| * @throws IllegalAccessError if the constructor is inaccessible. |
| */ |
| public MethodHandle unreflectConstructor(final Constructor<?> c) { |
| return unreflectConstructor(lookup, c); |
| } |
| |
| /** |
| * Performs a {@link java.lang.invoke.MethodHandles.Lookup#unreflectConstructor(Constructor)}, |
| * converting any encountered {@link IllegalAccessException} into an |
| * {@link IllegalAccessError}. |
| * |
| * @param lookup the lookup used to unreflect |
| * @param c the constructor to unreflect |
| * @return the unreflected constructor handle. |
| * @throws IllegalAccessError if the constructor is inaccessible. |
| */ |
| public static MethodHandle unreflectConstructor(final MethodHandles.Lookup lookup, final Constructor<?> c) { |
| try { |
| return lookup.unreflectConstructor(c); |
| } catch(final IllegalAccessException e) { |
| final IllegalAccessError ee = new IllegalAccessError("Failed to unreflect constructor " + c); |
| ee.initCause(e); |
| throw ee; |
| } |
| } |
| |
| /** |
| * Performs a {@link java.lang.invoke.MethodHandles.Lookup#findSpecial(Class, String, MethodType, Class)} |
| * on the underlying lookup. Converts any encountered |
| * {@link IllegalAccessException} into an {@link IllegalAccessError} and |
| * {@link NoSuchMethodException} into a {@link NoSuchMethodError}. |
| * |
| * @param declaringClass class declaring the method |
| * @param name the name of the method |
| * @param type the type of the method |
| * @return a method handle for the method |
| * @throws IllegalAccessError if the method is inaccessible. |
| * @throws NoSuchMethodError if the method does not exist. |
| */ |
| public MethodHandle findSpecial(final Class<?> declaringClass, final String name, final MethodType type) { |
| try { |
| return lookup.findSpecial(declaringClass, name, type, declaringClass); |
| } catch(final IllegalAccessException e) { |
| final IllegalAccessError ee = new IllegalAccessError("Failed to access special method " + methodDescription( |
| declaringClass, name, type)); |
| ee.initCause(e); |
| throw ee; |
| } catch(final NoSuchMethodException e) { |
| final NoSuchMethodError ee = new NoSuchMethodError("Failed to find special method " + methodDescription( |
| declaringClass, name, type)); |
| ee.initCause(e); |
| throw ee; |
| } |
| } |
| |
| private static String methodDescription(final Class<?> declaringClass, final String name, final MethodType type) { |
| return declaringClass.getName() + "#" + name + type; |
| } |
| |
| /** |
| * Performs a {@link java.lang.invoke.MethodHandles.Lookup#findStatic(Class, String, MethodType)} |
| * on the underlying lookup. Converts any encountered |
| * {@link IllegalAccessException} into an {@link IllegalAccessError} and |
| * {@link NoSuchMethodException} into a {@link NoSuchMethodError}. |
| * |
| * @param declaringClass class declaring the method |
| * @param name the name of the method |
| * @param type the type of the method |
| * @return a method handle for the method |
| * @throws IllegalAccessError if the method is inaccessible. |
| * @throws NoSuchMethodError if the method does not exist. |
| */ |
| public MethodHandle findStatic(final Class<?> declaringClass, final String name, final MethodType type) { |
| try { |
| return lookup.findStatic(declaringClass, name, type); |
| } catch(final IllegalAccessException e) { |
| final IllegalAccessError ee = new IllegalAccessError("Failed to access static method " + methodDescription( |
| declaringClass, name, type)); |
| ee.initCause(e); |
| throw ee; |
| } catch(final NoSuchMethodException e) { |
| final NoSuchMethodError ee = new NoSuchMethodError("Failed to find static method " + methodDescription( |
| declaringClass, name, type)); |
| ee.initCause(e); |
| throw ee; |
| } |
| } |
| |
| /** |
| * Performs a {@link java.lang.invoke.MethodHandles.Lookup#findVirtual(Class, String, MethodType)} |
| * on the underlying lookup. Converts any encountered |
| * {@link IllegalAccessException} into an {@link IllegalAccessError} and |
| * {@link NoSuchMethodException} into a {@link NoSuchMethodError}. |
| * |
| * @param declaringClass class declaring the method |
| * @param name the name of the method |
| * @param type the type of the method |
| * @return a method handle for the method |
| * @throws IllegalAccessError if the method is inaccessible. |
| * @throws NoSuchMethodError if the method does not exist. |
| */ |
| public MethodHandle findVirtual(final Class<?> declaringClass, final String name, final MethodType type) { |
| try { |
| return lookup.findVirtual(declaringClass, name, type); |
| } catch(final IllegalAccessException e) { |
| final IllegalAccessError ee = new IllegalAccessError("Failed to access virtual method " + methodDescription( |
| declaringClass, name, type)); |
| ee.initCause(e); |
| throw ee; |
| } catch(final NoSuchMethodException e) { |
| final NoSuchMethodError ee = new NoSuchMethodError("Failed to find virtual method " + methodDescription( |
| declaringClass, name, type)); |
| ee.initCause(e); |
| throw ee; |
| } |
| } |
| |
| /** |
| * Given a lookup, finds using {@link #findSpecial(Class, String, MethodType)} |
| * a method on that lookup's class. Useful in classes' code for convenient |
| * linking to their own privates. |
| * @param lookup the lookup for the class |
| * @param name the name of the method |
| * @param rtype the return type of the method |
| * @param ptypes the parameter types of the method |
| * @return the method handle for the method |
| */ |
| public static MethodHandle findOwnSpecial(final MethodHandles.Lookup lookup, final String name, final Class<?> rtype, final Class<?>... ptypes) { |
| return new Lookup(lookup).findOwnSpecial(name, rtype, ptypes); |
| } |
| |
| |
| /** |
| * Finds using {@link #findSpecial(Class, String, MethodType)} a method on |
| * that lookup's class. Useful in classes' code for convenient linking to |
| * their own privates. It's also more convenient than {@code findSpecial} |
| * in that you can just list the parameter types, and don't have to specify |
| * lookup class. |
| * @param name the name of the method |
| * @param rtype the return type of the method |
| * @param ptypes the parameter types of the method |
| * @return the method handle for the method |
| */ |
| public MethodHandle findOwnSpecial(final String name, final Class<?> rtype, final Class<?>... ptypes) { |
| return findSpecial(lookup.lookupClass(), name, MethodType.methodType(rtype, ptypes)); |
| } |
| |
| /** |
| * Given a lookup, finds using {@link #findStatic(Class, String, MethodType)} |
| * a method on that lookup's class. Useful in classes' code for convenient |
| * linking to their own privates. It's easier to use than {@code findStatic} |
| * in that you can just list the parameter types, and don't have to specify |
| * lookup class. |
| * @param lookup the lookup for the class |
| * @param name the name of the method |
| * @param rtype the return type of the method |
| * @param ptypes the parameter types of the method |
| * @return the method handle for the method |
| */ |
| public static MethodHandle findOwnStatic(final MethodHandles.Lookup lookup, final String name, final Class<?> rtype, final Class<?>... ptypes) { |
| return new Lookup(lookup).findOwnStatic(name, rtype, ptypes); |
| } |
| |
| /** |
| * Finds using {@link #findStatic(Class, String, MethodType)} a method on |
| * that lookup's class. Useful in classes' code for convenient linking to |
| * their own privates. It's easier to use than {@code findStatic} |
| * in that you can just list the parameter types, and don't have to specify |
| * lookup class. |
| * @param name the name of the method |
| * @param rtype the return type of the method |
| * @param ptypes the parameter types of the method |
| * @return the method handle for the method |
| */ |
| public MethodHandle findOwnStatic(final String name, final Class<?> rtype, final Class<?>... ptypes) { |
| return findStatic(lookup.lookupClass(), name, MethodType.methodType(rtype, ptypes)); |
| } |
| } |