1/* 2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26/* 27 * This file is available under and governed by the GNU General Public 28 * License version 2 only, as published by the Free Software Foundation. 29 * However, the following notice accompanied the original version of this 30 * file, and Oracle licenses the original version of this file under the BSD 31 * license: 32 */ 33/* 34 Copyright 2009-2013 Attila Szegedi 35 36 Licensed under both the Apache License, Version 2.0 (the "Apache License") 37 and the BSD License (the "BSD License"), with licensee being free to 38 choose either of the two at their discretion. 39 40 You may not use this file except in compliance with either the Apache 41 License or the BSD License. 42 43 If you choose to use this file in compliance with the Apache License, the 44 following notice applies to you: 45 46 You may obtain a copy of the Apache License at 47 48 http://www.apache.org/licenses/LICENSE-2.0 49 50 Unless required by applicable law or agreed to in writing, software 51 distributed under the License is distributed on an "AS IS" BASIS, 52 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 53 implied. See the License for the specific language governing 54 permissions and limitations under the License. 55 56 If you choose to use this file in compliance with the BSD License, the 57 following notice applies to you: 58 59 Redistribution and use in source and binary forms, with or without 60 modification, are permitted provided that the following conditions are 61 met: 62 * Redistributions of source code must retain the above copyright 63 notice, this list of conditions and the following disclaimer. 64 * Redistributions in binary form must reproduce the above copyright 65 notice, this list of conditions and the following disclaimer in the 66 documentation and/or other materials provided with the distribution. 67 * Neither the name of the copyright holder nor the names of 68 contributors may be used to endorse or promote products derived from 69 this software without specific prior written permission. 70 71 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 72 IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 73 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 74 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER 75 BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 76 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 77 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 78 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 79 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 80 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 81 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 82*/ 83 84package jdk.dynalink.beans; 85 86import java.lang.invoke.MethodHandle; 87import java.lang.reflect.Field; 88import java.lang.reflect.Member; 89import java.lang.reflect.Method; 90import java.lang.reflect.Modifier; 91import java.util.ArrayList; 92import java.util.Collection; 93import java.util.Collections; 94import java.util.Map; 95import jdk.dynalink.linker.support.Lookup; 96 97/** 98 * Base for classes that expose class field and method information to an {@link AbstractJavaLinker}. There are 99 * subclasses for instance (bean) and static facet of a class. 100 */ 101abstract class FacetIntrospector { 102 private final Class<?> clazz; 103 private final boolean instance; 104 private final boolean isRestricted; 105 106 protected final AccessibleMembersLookup membersLookup; 107 108 FacetIntrospector(final Class<?> clazz, final boolean instance) { 109 this.clazz = clazz; 110 this.instance = instance; 111 isRestricted = CheckRestrictedPackage.isRestrictedClass(clazz); 112 membersLookup = new AccessibleMembersLookup(clazz, instance); 113 } 114 115 /** 116 * Returns getters for inner classes. 117 * @return getters for inner classes. 118 */ 119 abstract Map<String, MethodHandle> getInnerClassGetters(); 120 121 /** 122 * Returns the fields for the class facet. 123 * @return the fields for the class facet. 124 */ 125 Collection<Field> getFields() { 126 if(isRestricted) { 127 // NOTE: we can't do anything here. Unlike with methods in AccessibleMethodsLookup, we can't just return 128 // the fields from a public superclass, because this class might define same-named fields which will shadow 129 // the superclass fields, and we have no way to know if they do, since we're denied invocation of 130 // getFields(). Therefore, the only correct course of action is to not expose any public fields from a class 131 // defined in a restricted package. 132 return Collections.emptySet(); 133 } 134 135 final Field[] fields = clazz.getFields(); 136 final Collection<Field> cfields = new ArrayList<>(fields.length); 137 for(final Field field: fields) { 138 final boolean isStatic = Modifier.isStatic(field.getModifiers()); 139 if(isStatic && clazz != field.getDeclaringClass()) { 140 // ignore inherited static fields 141 continue; 142 } 143 144 if(instance != isStatic && isAccessible(field)) { 145 cfields.add(field); 146 } 147 } 148 return cfields; 149 } 150 151 boolean isAccessible(final Member m) { 152 final Class<?> declaring = m.getDeclaringClass(); 153 // (declaring == clazz) is just an optimization - we're calling this only from code that operates on a 154 // non-restricted class, so if the declaring class is identical to the class being inspected, then forego 155 // a potentially expensive restricted-package check. 156 return declaring == clazz || !CheckRestrictedPackage.isRestrictedClass(declaring); 157 } 158 159 /** 160 * Returns all the methods in the facet. 161 * @return all the methods in the facet. 162 */ 163 Collection<Method> getMethods() { 164 return membersLookup.getMethods(); 165 } 166 167 168 MethodHandle unreflectGetter(final Field field) { 169 return editMethodHandle(Lookup.PUBLIC.unreflectGetter(field)); 170 } 171 172 MethodHandle unreflectSetter(final Field field) { 173 return editMethodHandle(Lookup.PUBLIC.unreflectSetter(field)); 174 } 175 176 /** 177 * Returns an edited method handle. A facet might need to edit an unreflected method handle before it is usable with 178 * the facet. By default, returns the passed method handle unchanged. The class' static facet will introduce a 179 * dropArguments. 180 * @param mh the method handle to edit. 181 * @return the edited method handle. 182 */ 183 abstract MethodHandle editMethodHandle(MethodHandle mh); 184} 185