| /* |
| * 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.Arrays; |
| 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; |
| } |
| |
| @Override |
| public String toString() { |
| return "ClassString[" + Arrays.toString(classes) + "]"; |
| } |
| |
| 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); |
| } |
| } |