--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/src/jdk/internal/dynalink/beans/AccessibleMembersLookup.java Thu Feb 14 13:22:26 2013 +0100
@@ -0,0 +1,262 @@
+/*
+ * 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);
+ }
+ }
+ }
+}