--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/src/jdk.dynalink/share/classes/jdk/dynalink/beans/ClassString.java Tue Nov 24 10:19:34 2015 +0100
@@ -0,0 +1,225 @@
+/*
+ * 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.dynalink.beans;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodType;
+import java.security.AccessControlContext;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.LinkedList;
+import java.util.List;
+import jdk.dynalink.internal.AccessControlContextFactory;
+import jdk.dynalink.internal.InternalTypeUtilities;
+import jdk.dynalink.linker.LinkerServices;
+import jdk.dynalink.linker.support.TypeUtilities;
+
+/**
+ * Represents a sequence of {@link Class} objects, useful for representing method signatures. Provides value
+ * semantics for using them as map keys, as well as specificity calculations and applicability checks as per
+ * JLS.
+ */
+final class ClassString {
+ private static final AccessControlContext GET_CLASS_LOADER_CONTEXT =
+ AccessControlContextFactory.createAccessControlContext("getClassLoader");
+
+ /**
+ * An anonymous inner class used solely to represent the "type" of null values for method applicability checking.
+ */
+ static final Class<?> NULL_CLASS = (new Object() { /* Intentionally empty */ }).getClass();
+
+ private final Class<?>[] classes;
+ private int hashCode;
+
+ ClassString(final Class<?>[] classes) {
+ this.classes = classes;
+ }
+
+ ClassString(final MethodType type) {
+ this(type.parameterArray());
+ }
+
+ @Override
+ public boolean equals(final Object other) {
+ if(!(other instanceof ClassString)) {
+ return false;
+ }
+ final Class<?>[] otherClasses = ((ClassString)other).classes;
+ if(otherClasses.length != classes.length) {
+ return false;
+ }
+ for(int i = 0; i < otherClasses.length; ++i) {
+ if(otherClasses[i] != classes[i]) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ @Override
+ public int hashCode() {
+ if(hashCode == 0) {
+ int h = 0;
+ for(int i = 0; i < classes.length; ++i) {
+ h ^= classes[i].hashCode();
+ }
+ hashCode = h;
+ }
+ return hashCode;
+ }
+
+ boolean isVisibleFrom(final ClassLoader classLoader) {
+ return AccessController.doPrivileged(new PrivilegedAction<Boolean>() {
+ @Override
+ public Boolean run() {
+ for(final Class<?> clazz: classes) {
+ if(!InternalTypeUtilities.canReferenceDirectly(classLoader, clazz.getClassLoader())) {
+ return false;
+ }
+ }
+ return true;
+ }
+ }, GET_CLASS_LOADER_CONTEXT);
+ }
+
+ List<MethodHandle> getMaximallySpecifics(final List<MethodHandle> methods, final LinkerServices linkerServices, final boolean varArg) {
+ return MaximallySpecific.getMaximallySpecificMethodHandles(getApplicables(methods, linkerServices, varArg),
+ varArg, classes, linkerServices);
+ }
+
+ /**
+ * Returns all methods that are applicable to actual parameter classes represented by this ClassString object.
+ */
+ LinkedList<MethodHandle> getApplicables(final List<MethodHandle> methods, final LinkerServices linkerServices, final boolean varArg) {
+ final LinkedList<MethodHandle> list = new LinkedList<>();
+ for(final MethodHandle member: methods) {
+ if(isApplicable(member, linkerServices, varArg)) {
+ list.add(member);
+ }
+ }
+ return list;
+ }
+
+ /**
+ * Returns true if the supplied method is applicable to actual parameter classes represented by this ClassString
+ * object.
+ *
+ */
+ private boolean isApplicable(final MethodHandle method, final LinkerServices linkerServices, final boolean varArg) {
+ final Class<?>[] formalTypes = method.type().parameterArray();
+ final int cl = classes.length;
+ final int fl = formalTypes.length - (varArg ? 1 : 0);
+ if(varArg) {
+ if(cl < fl) {
+ return false;
+ }
+ } else {
+ if(cl != fl) {
+ return false;
+ }
+ }
+ // Starting from 1 as we ignore the receiver type
+ for(int i = 1; i < fl; ++i) {
+ if(!canConvert(linkerServices, classes[i], formalTypes[i])) {
+ return false;
+ }
+ }
+ if(varArg) {
+ final Class<?> varArgType = formalTypes[fl].getComponentType();
+ for(int i = fl; i < cl; ++i) {
+ if(!canConvert(linkerServices, classes[i], varArgType)) {
+ return false;
+ }
+ }
+ }
+ return true;
+ }
+
+ private static boolean canConvert(final LinkerServices ls, final Class<?> from, final Class<?> to) {
+ if(from == NULL_CLASS) {
+ return !to.isPrimitive();
+ }
+ return ls == null ? TypeUtilities.isMethodInvocationConvertible(from, to) : ls.canConvert(from, to);
+ }
+}