jdk8-mips64-public/nashorn: comparison src/jdk/internal/dynalink/beans/AccessibleMembersLookup.java

-:43e32b36153c
+:5a820fb11814
+/*
+* 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.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.LinkedHashSet;
+import java.util.Map;
+import java.util.Set;
+/**
+* Utility class for discovering accessible methods and inner classes. Normally, a public member declared on a class is
+* accessible (that is, it can be invoked from anywhere). However, this is not the case if the class itself is not
+* public, or belongs to a restricted-access package. In that case, it is required to lookup a member in a publicly
+* accessible superclass or implemented interface of the class, and use it instead of the member discovered on the
+* class.
+*
+* @author Attila Szegedi
+*/
+class AccessibleMembersLookup {
+private final Map<MethodSignature, Method> methods;
+private final Set<Class<?>> innerClasses;
+private boolean instance;
+/**
+* Creates a mapping for all accessible methods and inner classes on a class.
+*
+* @param clazz the inspected class
+* @param instance true to inspect instance methods, false to inspect static methods.
+*/
+AccessibleMembersLookup(final Class<?> clazz, boolean instance) {
+this.methods = new HashMap<>();
+this.innerClasses = new LinkedHashSet<>();
+this.instance = instance;
+lookupAccessibleMembers(clazz);
+}
+/**
+* Returns an accessible method equivalent of a method.
+*
+* @param m the method whose accessible equivalent is requested.
+* @return the accessible equivalent for the method (can be the same as the passed in method), or null if there is
+* no accessible method equivalent.
+*/
+Method getAccessibleMethod(final Method m) {
+return m == null ? null : methods.get(new MethodSignature(m));
+}
+Collection<Method> getMethods() {
+return methods.values();
+}
+Class<?>[] getInnerClasses() {
+return innerClasses.toArray(new Class<?>[innerClasses.size()]);
+}
+/**
+* A helper class that represents a method signature - name and argument types.
+*
+* @author Attila Szegedi
+*/
+static final class MethodSignature {
+private final String name;
+private final Class<?>[] args;
+/**
+* Creates a new method signature from arbitrary data.
+*
+* @param name the name of the method this signature represents.
+* @param args the argument types of the method.
+*/
+MethodSignature(String name, Class<?>[] args) {
+this.name = name;
+this.args = args;
+}
+/**
+* Creates a signature for the given method.
+*
+* @param method the method for which a signature is created.
+*/
+MethodSignature(final Method method) {
+this(method.getName(), method.getParameterTypes());
+}
+/**
+* Compares this object to another object
+*
+* @param o the other object
+* @return true if the other object is also a method signature with the same name, same number of arguments, and
+* same types of arguments.
+*/
+@Override
+public boolean equals(final Object o) {
+if(o instanceof MethodSignature) {
+final MethodSignature ms = (MethodSignature)o;
+return ms.name.equals(name) && Arrays.equals(args, ms.args);
+}
+return false;
+}
+/**
+* Returns a hash code, consistent with the overridden {@link #equals(Object)}.
+*/
+@Override
+public int hashCode() {
+return name.hashCode() ^ Arrays.hashCode(args);
+}
+@Override
+public String toString() {
+final StringBuilder b = new StringBuilder();
+b.append("[MethodSignature ").append(name).append('(');
+if(args.length > 0) {
+b.append(args[0].getCanonicalName());
+for(int i = 1; i < args.length; ++i) {
+b.append(", ").append(args[i].getCanonicalName());
+}
+}
+return b.append(")]").toString();
+}
+}
+private void lookupAccessibleMembers(final Class<?> clazz) {
+boolean searchSuperTypes;
+if(!CheckRestrictedPackage.isRestrictedClass(clazz)) {
+searchSuperTypes = false;
+for(Method method: clazz.getMethods()) {
+if(instance != Modifier.isStatic(method.getModifiers())) {
+final MethodSignature sig = new MethodSignature(method);
+if(!methods.containsKey(sig)) {
+final Class<?> declaringClass = method.getDeclaringClass();
+if(declaringClass != clazz && CheckRestrictedPackage.isRestrictedClass(declaringClass)) {
+//Sometimes, the declaring class of a method (Method.getDeclaringClass())
+//retrieved through Class.getMethods() for a public class will be a
+//non-public superclass. For such a method, we need to find a method with
+//the same name and signature in a public superclass or implemented
+//interface.
+//This typically doesn't happen with classes emitted by a reasonably modern
+//javac, as it'll create synthetic delegator methods in all public
+//immediate subclasses of the non-public class. We have, however, observed
+//this in the wild with class files compiled with older javac that doesn't
+//generate the said synthetic delegators.
+searchSuperTypes = true;
+} else {
+methods.put(sig, method);
+}
+}
+}
+}
+for(Class<?> innerClass: clazz.getClasses()) {
+// Add both static and non-static classes, regardless of instance flag. StaticClassLinker will just
+// expose non-static classes with explicit constructor outer class argument.
+// NOTE: getting inner class objects through getClasses() does not resolve them, so if those classes
+// were not yet loaded, they'll only get loaded in a non-resolved state; no static initializers for
+// them will trigger just by doing this.
+innerClasses.add(innerClass);
+}
+} else {
+searchSuperTypes = true;
+}
+if(searchSuperTypes) {
+// If we reach here, the class is either not public, or it is in a restricted package. Alternatively, it is
+// public, but some of its methods claim that their declaring class is non-public. We'll try superclasses
+// and implemented interfaces then looking for public ones.
+final Class<?>[] interfaces = clazz.getInterfaces();
+for(int i = 0; i < interfaces.length; i++) {
+lookupAccessibleMembers(interfaces[i]);
+}
+final Class<?> superclass = clazz.getSuperclass();
+if(superclass != null) {
+lookupAccessibleMembers(superclass);
+}
+}
+}
+}

Mercurial > jdk8-mips64-public > nashorn / file comparison

comparison: src/jdk/internal/dynalink/beans/AccessibleMembersLookup.java

src/jdk/internal/dynalink/beans/AccessibleMembersLookup.java