src/jdk.dynalink/share/classes/jdk/dynalink/beans/AccessibleMembersLookup.java
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
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/*
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 * Copyright (c) 2010, 2016, 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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/*
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 * This file is available under and governed by the GNU General Public
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 * License version 2 only, as published by the Free Software Foundation.
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 * However, the following notice accompanied the original version of this
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 * file, and Oracle licenses the original version of this file under the BSD
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 * license:
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 */
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/*
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   Copyright 2009-2013 Attila Szegedi
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   Licensed under both the Apache License, Version 2.0 (the "Apache License")
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   and the BSD License (the "BSD License"), with licensee being free to
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   choose either of the two at their discretion.
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   You may not use this file except in compliance with either the Apache
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   License or the BSD License.
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   If you choose to use this file in compliance with the Apache License, the
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   following notice applies to you:
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       You may obtain a copy of the Apache License at
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           http://www.apache.org/licenses/LICENSE-2.0
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       Unless required by applicable law or agreed to in writing, software
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       distributed under the License is distributed on an "AS IS" BASIS,
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       WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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       implied. See the License for the specific language governing
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       permissions and limitations under the License.
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   If you choose to use this file in compliance with the BSD License, the
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   following notice applies to you:
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       Redistribution and use in source and binary forms, with or without
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       modification, are permitted provided that the following conditions are
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       met:
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       * Redistributions of source code must retain the above copyright
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         notice, this list of conditions and the following disclaimer.
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       * Redistributions in binary form must reproduce the above copyright
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         notice, this list of conditions and the following disclaimer in the
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         documentation and/or other materials provided with the distribution.
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       * Neither the name of the copyright holder nor the names of
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         contributors may be used to endorse or promote products derived from
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         this software without specific prior written permission.
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       THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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       IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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       TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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       PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
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       BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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       CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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       SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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       BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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       WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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       OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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       ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package jdk.dynalink.beans;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.LinkedHashSet;
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import java.util.Map;
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import java.util.Set;
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/**
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 * Utility class for discovering accessible methods and inner classes. Normally, a public member declared on a class is
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 * accessible (that is, it can be invoked from anywhere). However, this is not the case if the class itself is not
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 * public, or belongs to a restricted-access package. In that case, it is required to lookup a member in a publicly
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 * accessible superclass or implemented interface of the class, and use it instead of the member discovered on the
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 * class.
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 */
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class AccessibleMembersLookup {
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    private final Map<MethodSignature, Method> methods;
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    private final Set<Class<?>> innerClasses;
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    private final boolean instance;
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    /**
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     * Creates a mapping for all accessible methods and inner classes on a class.
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     *
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     * @param clazz the inspected class
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     * @param instance true to inspect instance methods, false to inspect static methods.
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     */
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    AccessibleMembersLookup(final Class<?> clazz, final boolean instance) {
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        this.methods = new HashMap<>();
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        this.innerClasses = new LinkedHashSet<>();
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        this.instance = instance;
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        lookupAccessibleMembers(clazz);
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    }
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    /**
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     * Returns an accessible method equivalent of a method.
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     *
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     * @param m the method whose accessible equivalent is requested.
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     * @return the accessible equivalent for the method (can be the same as the passed in method), or null if there is
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     * no accessible method equivalent.
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     */
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    Method getAccessibleMethod(final Method m) {
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        return m == null ? null : methods.get(new MethodSignature(m));
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    }
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    Collection<Method> getMethods() {
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        return methods.values();
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    }
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    Class<?>[] getInnerClasses() {
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        return innerClasses.toArray(new Class<?>[0]);
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    }
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    /**
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     * A helper class that represents a method signature - name and argument types.
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     */
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    static final class MethodSignature {
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        private final String name;
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        private final Class<?>[] args;
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        /**
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         * Creates a new method signature from arbitrary data.
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         *
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         * @param name the name of the method this signature represents.
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         * @param args the argument types of the method.
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         */
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        MethodSignature(final String name, final Class<?>[] args) {
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            this.name = name;
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            this.args = args;
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        }
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        /**
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         * Creates a signature for the given method.
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         *
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         * @param method the method for which a signature is created.
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         */
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        MethodSignature(final Method method) {
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            this(method.getName(), method.getParameterTypes());
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        }
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        /**
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         * Compares this object to another object
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         *
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         * @param o the other object
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         * @return true if the other object is also a method signature with the same name, same number of arguments, and
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         * same types of arguments.
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         */
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        @Override
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        public boolean equals(final Object o) {
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            if(o instanceof MethodSignature) {
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                final MethodSignature ms = (MethodSignature)o;
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                return ms.name.equals(name) && Arrays.equals(args, ms.args);
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            }
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            return false;
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        }
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        /**
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         * Returns a hash code, consistent with the overridden {@link #equals(Object)}.
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         */
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        @Override
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        public int hashCode() {
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            return name.hashCode() ^ Arrays.hashCode(args);
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        }
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        @Override
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        public String toString() {
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            final StringBuilder b = new StringBuilder();
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            b.append("[MethodSignature ").append(name).append('(');
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            if(args.length > 0) {
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                b.append(args[0].getCanonicalName());
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                for(int i = 1; i < args.length; ++i) {
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                    b.append(", ").append(args[i].getCanonicalName());
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                }
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            }
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            return b.append(")]").toString();
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        }
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    }
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    private void lookupAccessibleMembers(final Class<?> clazz) {
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        boolean searchSuperTypes;
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        if(!CheckRestrictedPackage.isRestrictedClass(clazz)) {
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            searchSuperTypes = false;
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            for(final Method method: clazz.getMethods()) {
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                final boolean isStatic = Modifier.isStatic(method.getModifiers());
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                if(instance != isStatic) {
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                    final MethodSignature sig = new MethodSignature(method);
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                    if(!methods.containsKey(sig)) {
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                        final Class<?> declaringClass = method.getDeclaringClass();
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                        if(declaringClass != clazz && CheckRestrictedPackage.isRestrictedClass(declaringClass)) {
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                            //Sometimes, the declaring class of a method (Method.getDeclaringClass())
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                            //retrieved through Class.getMethods() for a public class will be a
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                            //non-public superclass. For such a method, we need to find a method with
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                            //the same name and signature in a public superclass or implemented
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                            //interface.
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                            //This typically doesn't happen with classes emitted by a reasonably modern
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                            //javac, as it'll create synthetic delegator methods in all public
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                            //immediate subclasses of the non-public class. We have, however, observed
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                            //this in the wild with class files compiled with older javac that doesn't
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                            //generate the said synthetic delegators.
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                            searchSuperTypes = true;
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                        } else {
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                            // don't allow inherited static
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                            if (!isStatic || clazz == declaringClass) {
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                                methods.put(sig, method);
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                            }
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                        }
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                    }
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                }
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            }
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            for(final Class<?> innerClass: clazz.getClasses()) {
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                // Add both static and non-static classes, regardless of instance flag. StaticClassLinker will just
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                // expose non-static classes with explicit constructor outer class argument.
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                // NOTE: getting inner class objects through getClasses() does not resolve them, so if those classes
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                // were not yet loaded, they'll only get loaded in a non-resolved state; no static initializers for
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                // them will trigger just by doing this.
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                innerClasses.add(innerClass);
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            }
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        } else {
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            searchSuperTypes = true;
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        }
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        // don't need to search super types for static methods
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        if(instance && searchSuperTypes) {
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            // If we reach here, the class is either not public, or it is in a restricted package. Alternatively, it is
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            // public, but some of its methods claim that their declaring class is non-public. We'll try superclasses
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            // and implemented interfaces then looking for public ones.
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            final Class<?>[] interfaces = clazz.getInterfaces();
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            for(int i = 0; i < interfaces.length; i++) {
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                lookupAccessibleMembers(interfaces[i]);
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            }
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            final Class<?> superclass = clazz.getSuperclass();
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            if(superclass != null) {
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                lookupAccessibleMembers(superclass);
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            }
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        }
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    }
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}