Mercurial > jdk8-mips64-public > nashorn / file comparison

comparison: src/jdk/internal/dynalink/beans/BeansLinker.java

src/jdk/internal/dynalink/beans/BeansLinker.java

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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
84 package jdk.internal.dynalink.beans;
85
86 import java.beans.BeanInfo;
87 import java.lang.invoke.MethodHandles;
88 import jdk.internal.dynalink.CallSiteDescriptor;
89 import jdk.internal.dynalink.DynamicLinkerFactory;
90 import jdk.internal.dynalink.linker.GuardedInvocation;
91 import jdk.internal.dynalink.linker.GuardingDynamicLinker;
92 import jdk.internal.dynalink.linker.LinkRequest;
93 import jdk.internal.dynalink.linker.LinkerServices;
94 import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker;
95
96
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 property getters and setters declared by the class' {@link BeanInfo};</li>
104 * <li>expose all public methods and methods declared by the class' {@link BeanInfo} for invocation through
105 * {@code dyn:callMethod} operation;</li>
106 * <li>expose all public methods and methods declared by the class' {@link BeanInfo} for retrieval for
107 * {@code dyn:getMethod} operation; the methods thus retrieved can then be invoked using {@code dyn:call};</li>
108 * <li>expose all public fields as properties, unless there are getters or setters for the properties of the same name;</li>
109 * <li>expose {@code dyn:getLength}, {@code dyn:getElem} and {@code dyn:setElem} on native Java arrays, as well as
110 * {@link java.util.List} and {@link java.util.Map} objects; ({@code dyn:getLength} works on any
111 * {@link java.util.Collection});</li>
112 * <li>expose a virtual property named {@code length} on Java arrays;</li>
113 * <li>expose {@code dyn:new} on instances of {@link StaticClass} as calls to constructors, including those static class
114 * objects that represent Java arrays (their constructors take a single {@code int} parameter representing the length of
115 * the array to create);</li>
116 * <li>expose static methods, fields, and properties of classes in a similar manner to how instance method, fields, and
117 * properties are exposed, on {@link StaticClass} objects.</li>
118 * <li>expose a virtual property named {@code static} on instances of {@link java.lang.Class} to access their
119 * {@link StaticClass}.</li>
120 * </ul>
121 * <p><strong>Overloaded method resolution</strong> is performed automatically for property setters, methods, and
122 * constructors. Additionally, manual overloaded method selection is supported by having a call site specify a name for
123 * a method that contains an explicit signature, i.e. {@code dyn:getMethod:parseInt(String,int)}. You can use
124 * non-qualified class names in such signatures regardless of those classes' packages, they will match any class with
125 * the same non-qualified name. You only have to use a fully qualified class name in case non-qualified class names
126 * would cause selection ambiguity (that is extremely rare).</p>
127 * <p><strong>Variable argument invocation</strong> is handled for both methods and constructors.</p>
128 * <p>Currently, only public fields and methods are supported. Any Lookup objects passed in the
129 * {@link LinkRequest}s are ignored and {@link MethodHandles#publicLookup()} is used instead.</p>
130 *
131 * @author Attila Szegedi
132 */
133 public class BeansLinker implements GuardingDynamicLinker {
134 private static final ClassValue<TypeBasedGuardingDynamicLinker> linkers = new ClassValue<TypeBasedGuardingDynamicLinker>() {
135 @Override
136 protected TypeBasedGuardingDynamicLinker computeValue(Class<?> clazz) {
137 // If ClassValue.put() were public, we could just pre-populate with these known mappings...
138 return
139 clazz == Class.class ? new ClassLinker() :
140 clazz == StaticClass.class ? new StaticClassLinker() :
141 DynamicMethod.class.isAssignableFrom(clazz) ? new DynamicMethodLinker() :
142 new BeanLinker(clazz);
143 }
144 };
145
146 /**
147 * Creates a new POJO linker.
148 */
149 public BeansLinker() {
150 }
151
152 /**
153 * Returns a bean linker for a particular single class. Useful when you need to override or extend the behavior of
154 * linking for some classes in your language runtime's linker, but still want to delegate to the default behavior in
155 * some cases.
156 * @param clazz the class
157 * @return a bean linker for that class
158 */
159 public static TypeBasedGuardingDynamicLinker getLinkerForClass(Class<?> clazz) {
160 return linkers.get(clazz);
161 }
162
163 @Override
164 public GuardedInvocation getGuardedInvocation(LinkRequest request, final LinkerServices linkerServices)
165 throws Exception {
166 final CallSiteDescriptor callSiteDescriptor = request.getCallSiteDescriptor();
167 final int l = callSiteDescriptor.getNameTokenCount();
168 // All names conforming to the dynalang MOP should have at least two tokens, the first one being "dyn"
169 if(l < 2 || "dyn" != callSiteDescriptor.getNameToken(CallSiteDescriptor.SCHEME)) {
170 return null;
171 }
172
173 final Object receiver = request.getReceiver();
174 if(receiver == null) {
175 // Can't operate on null
176 return null;
177 }
178 return getLinkerForClass(receiver.getClass()).getGuardedInvocation(request, linkerServices);
179 }
180 }

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