Thu, 12 Feb 2015 16:43:33 +0100
8072596: Arrays.asList results in ClassCastException with a JS array
Reviewed-by: lagergren, sundar
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
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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
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
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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
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.
40 You may not use this file except in compliance with either the Apache
41 License or the BSD License.
43 If you choose to use this file in compliance with the Apache License, the
44 following notice applies to you:
46 You may obtain a copy of the Apache License at
48 http://www.apache.org/licenses/LICENSE-2.0
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.
56 If you choose to use this file in compliance with the BSD License, the
57 following notice applies to you:
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.
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 */
84 package jdk.internal.dynalink.beans;
86 import java.lang.invoke.MethodHandles;
87 import java.util.Collection;
88 import java.util.Collections;
89 import jdk.internal.dynalink.CallSiteDescriptor;
90 import jdk.internal.dynalink.DynamicLinkerFactory;
91 import jdk.internal.dynalink.linker.GuardedInvocation;
92 import jdk.internal.dynalink.linker.GuardingDynamicLinker;
93 import jdk.internal.dynalink.linker.LinkRequest;
94 import jdk.internal.dynalink.linker.LinkerServices;
95 import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker;
97 /**
98 * A linker for POJOs. Normally used as the ultimate fallback linker by the {@link DynamicLinkerFactory} so it is given
99 * the chance to link calls to all objects that no other language runtime recognizes. Specifically, this linker will:
100 * <ul>
101 * <li>expose all public methods of form {@code setXxx()}, {@code getXxx()}, and {@code isXxx()} as property setters and
102 * getters for {@code dyn:setProp} and {@code dyn:getProp} operations;</li>
103 * <li>expose all public methods for invocation through {@code dyn:callMethod} operation;</li>
104 * <li>expose all public methods for retrieval for {@code dyn:getMethod} operation; the methods thus retrieved can then
105 * be invoked using {@code dyn:call};</li>
106 * <li>expose all public fields as properties, unless there are getters or setters for the properties of the same name;</li>
107 * <li>expose {@code dyn:getLength}, {@code dyn:getElem} and {@code dyn:setElem} on native Java arrays, as well as
108 * {@link java.util.List} and {@link java.util.Map} objects; ({@code dyn:getLength} works on any
109 * {@link java.util.Collection});</li>
110 * <li>expose a virtual property named {@code length} on Java arrays;</li>
111 * <li>expose {@code dyn:new} on instances of {@link StaticClass} as calls to constructors, including those static class
112 * objects that represent Java arrays (their constructors take a single {@code int} parameter representing the length of
113 * the array to create);</li>
114 * <li>expose static methods, fields, and properties of classes in a similar manner to how instance method, fields, and
115 * properties are exposed, on {@link StaticClass} objects.</li>
116 * <li>expose a virtual property named {@code static} on instances of {@link java.lang.Class} to access their
117 * {@link StaticClass}.</li>
118 * </ul>
119 * <p><strong>Overloaded method resolution</strong> is performed automatically for property setters, methods, and
120 * constructors. Additionally, manual overloaded method selection is supported by having a call site specify a name for
121 * a method that contains an explicit signature, i.e. {@code dyn:getMethod:parseInt(String,int)}. You can use
122 * non-qualified class names in such signatures regardless of those classes' packages, they will match any class with
123 * the same non-qualified name. You only have to use a fully qualified class name in case non-qualified class names
124 * would cause selection ambiguity (that is extremely rare).</p>
125 * <p><strong>Variable argument invocation</strong> is handled for both methods and constructors.</p>
126 * <p>Currently, only public fields and methods are supported. Any Lookup objects passed in the
127 * {@link LinkRequest}s are ignored and {@link MethodHandles#publicLookup()} is used instead.</p>
128 *
129 * @author Attila Szegedi
130 */
131 public class BeansLinker implements GuardingDynamicLinker {
132 private static final ClassValue<TypeBasedGuardingDynamicLinker> linkers = new ClassValue<TypeBasedGuardingDynamicLinker>() {
133 @Override
134 protected TypeBasedGuardingDynamicLinker computeValue(final Class<?> clazz) {
135 // If ClassValue.put() were public, we could just pre-populate with these known mappings...
136 return
137 clazz == Class.class ? new ClassLinker() :
138 clazz == StaticClass.class ? new StaticClassLinker() :
139 DynamicMethod.class.isAssignableFrom(clazz) ? new DynamicMethodLinker() :
140 new BeanLinker(clazz);
141 }
142 };
144 /**
145 * Creates a new POJO linker.
146 */
147 public BeansLinker() {
148 }
150 /**
151 * Returns a bean linker for a particular single class. Useful when you need to override or extend the behavior of
152 * linking for some classes in your language runtime's linker, but still want to delegate to the default behavior in
153 * some cases.
154 * @param clazz the class
155 * @return a bean linker for that class
156 */
157 public static TypeBasedGuardingDynamicLinker getLinkerForClass(final Class<?> clazz) {
158 return linkers.get(clazz);
159 }
161 /**
162 * Returns true if the object is a Dynalink Java dynamic method.
163 *
164 * @param obj the object we want to test for being a dynamic method
165 * @return true if it is a dynamic method, false otherwise.
166 */
167 public static boolean isDynamicMethod(final Object obj) {
168 return obj instanceof DynamicMethod;
169 }
171 /**
172 * Returns true if the object is a Dynalink Java constructor.
173 *
174 * @param obj the object we want to test for being a constructor
175 * @return true if it is a constructor, false otherwise.
176 */
177 public static boolean isDynamicConstructor(final Object obj) {
178 return obj instanceof DynamicMethod && ((DynamicMethod)obj).isConstructor();
179 }
181 /**
182 * Return the dynamic method of constructor of the given class and the given signature.
183 * @param clazz the class
184 * @param signature full signature of the constructor
185 * @return DynamicMethod for the constructor
186 */
187 public static Object getConstructorMethod(final Class<?> clazz, final String signature) {
188 return StaticClassLinker.getConstructorMethod(clazz, signature);
189 }
191 /**
192 * Returns a collection of names of all readable instance properties of a class.
193 * @param clazz the class
194 * @return a collection of names of all readable instance properties of a class.
195 */
196 public static Collection<String> getReadableInstancePropertyNames(final Class<?> clazz) {
197 final TypeBasedGuardingDynamicLinker linker = getLinkerForClass(clazz);
198 if(linker instanceof BeanLinker) {
199 return ((BeanLinker)linker).getReadablePropertyNames();
200 }
201 return Collections.emptySet();
202 }
204 /**
205 * Returns a collection of names of all writable instance properties of a class.
206 * @param clazz the class
207 * @return a collection of names of all writable instance properties of a class.
208 */
209 public static Collection<String> getWritableInstancePropertyNames(final Class<?> clazz) {
210 final TypeBasedGuardingDynamicLinker linker = getLinkerForClass(clazz);
211 if(linker instanceof BeanLinker) {
212 return ((BeanLinker)linker).getWritablePropertyNames();
213 }
214 return Collections.emptySet();
215 }
217 /**
218 * Returns a collection of names of all instance methods of a class.
219 * @param clazz the class
220 * @return a collection of names of all instance methods of a class.
221 */
222 public static Collection<String> getInstanceMethodNames(final Class<?> clazz) {
223 final TypeBasedGuardingDynamicLinker linker = getLinkerForClass(clazz);
224 if(linker instanceof BeanLinker) {
225 return ((BeanLinker)linker).getMethodNames();
226 }
227 return Collections.emptySet();
228 }
230 /**
231 * Returns a collection of names of all readable static properties of a class.
232 * @param clazz the class
233 * @return a collection of names of all readable static properties of a class.
234 */
235 public static Collection<String> getReadableStaticPropertyNames(final Class<?> clazz) {
236 return StaticClassLinker.getReadableStaticPropertyNames(clazz);
237 }
239 /**
240 * Returns a collection of names of all writable static properties of a class.
241 * @param clazz the class
242 * @return a collection of names of all writable static properties of a class.
243 */
244 public static Collection<String> getWritableStaticPropertyNames(final Class<?> clazz) {
245 return StaticClassLinker.getWritableStaticPropertyNames(clazz);
246 }
248 /**
249 * Returns a collection of names of all static methods of a class.
250 * @param clazz the class
251 * @return a collection of names of all static methods of a class.
252 */
253 public static Collection<String> getStaticMethodNames(final Class<?> clazz) {
254 return StaticClassLinker.getStaticMethodNames(clazz);
255 }
257 @Override
258 public GuardedInvocation getGuardedInvocation(final LinkRequest request, final LinkerServices linkerServices)
259 throws Exception {
260 final CallSiteDescriptor callSiteDescriptor = request.getCallSiteDescriptor();
261 final int l = callSiteDescriptor.getNameTokenCount();
262 // All names conforming to the dynalang MOP should have at least two tokens, the first one being "dyn"
263 if(l < 2 || "dyn" != callSiteDescriptor.getNameToken(CallSiteDescriptor.SCHEME)) {
264 return null;
265 }
267 final Object receiver = request.getReceiver();
268 if(receiver == null) {
269 // Can't operate on null
270 return null;
271 }
272 return getLinkerForClass(receiver.getClass()).getGuardedInvocation(request, linkerServices);
273 }
274 }