1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/jdk/internal/dynalink/beans/BeansLinker.java Thu Feb 14 13:22:26 2013 +0100
1.3 @@ -0,0 +1,180 @@
1.4 +/*
1.5 + * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +/*
1.30 + * This file is available under and governed by the GNU General Public
1.31 + * License version 2 only, as published by the Free Software Foundation.
1.32 + * However, the following notice accompanied the original version of this
1.33 + * file, and Oracle licenses the original version of this file under the BSD
1.34 + * license:
1.35 + */
1.36 +/*
1.37 + Copyright 2009-2013 Attila Szegedi
1.38 +
1.39 + Licensed under both the Apache License, Version 2.0 (the "Apache License")
1.40 + and the BSD License (the "BSD License"), with licensee being free to
1.41 + choose either of the two at their discretion.
1.42 +
1.43 + You may not use this file except in compliance with either the Apache
1.44 + License or the BSD License.
1.45 +
1.46 + If you choose to use this file in compliance with the Apache License, the
1.47 + following notice applies to you:
1.48 +
1.49 + You may obtain a copy of the Apache License at
1.50 +
1.51 + http://www.apache.org/licenses/LICENSE-2.0
1.52 +
1.53 + Unless required by applicable law or agreed to in writing, software
1.54 + distributed under the License is distributed on an "AS IS" BASIS,
1.55 + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
1.56 + implied. See the License for the specific language governing
1.57 + permissions and limitations under the License.
1.58 +
1.59 + If you choose to use this file in compliance with the BSD License, the
1.60 + following notice applies to you:
1.61 +
1.62 + Redistribution and use in source and binary forms, with or without
1.63 + modification, are permitted provided that the following conditions are
1.64 + met:
1.65 + * Redistributions of source code must retain the above copyright
1.66 + notice, this list of conditions and the following disclaimer.
1.67 + * Redistributions in binary form must reproduce the above copyright
1.68 + notice, this list of conditions and the following disclaimer in the
1.69 + documentation and/or other materials provided with the distribution.
1.70 + * Neither the name of the copyright holder nor the names of
1.71 + contributors may be used to endorse or promote products derived from
1.72 + this software without specific prior written permission.
1.73 +
1.74 + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
1.75 + IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
1.76 + TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
1.77 + PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
1.78 + BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.79 + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.80 + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
1.81 + BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
1.82 + WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
1.83 + OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
1.84 + ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.85 +*/
1.86 +
1.87 +package jdk.internal.dynalink.beans;
1.88 +
1.89 +import java.beans.BeanInfo;
1.90 +import java.lang.invoke.MethodHandles;
1.91 +import jdk.internal.dynalink.CallSiteDescriptor;
1.92 +import jdk.internal.dynalink.DynamicLinkerFactory;
1.93 +import jdk.internal.dynalink.linker.GuardedInvocation;
1.94 +import jdk.internal.dynalink.linker.GuardingDynamicLinker;
1.95 +import jdk.internal.dynalink.linker.LinkRequest;
1.96 +import jdk.internal.dynalink.linker.LinkerServices;
1.97 +import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker;
1.98 +
1.99 +
1.100 +/**
1.101 + * A linker for POJOs. Normally used as the ultimate fallback linker by the {@link DynamicLinkerFactory} so it is given
1.102 + * the chance to link calls to all objects that no other language runtime recognizes. Specifically, this linker will:
1.103 + * <ul>
1.104 + * <li>expose all public methods of form {@code setXxx()}, {@code getXxx()}, and {@code isXxx()} as property setters and
1.105 + * getters for {@code dyn:setProp} and {@code dyn:getProp} operations;</li>
1.106 + * <li>expose all property getters and setters declared by the class' {@link BeanInfo};</li>
1.107 + * <li>expose all public methods and methods declared by the class' {@link BeanInfo} for invocation through
1.108 + * {@code dyn:callMethod} operation;</li>
1.109 + * <li>expose all public methods and methods declared by the class' {@link BeanInfo} for retrieval for
1.110 + * {@code dyn:getMethod} operation; the methods thus retrieved can then be invoked using {@code dyn:call};</li>
1.111 + * <li>expose all public fields as properties, unless there are getters or setters for the properties of the same name;</li>
1.112 + * <li>expose {@code dyn:getLength}, {@code dyn:getElem} and {@code dyn:setElem} on native Java arrays, as well as
1.113 + * {@link java.util.List} and {@link java.util.Map} objects; ({@code dyn:getLength} works on any
1.114 + * {@link java.util.Collection});</li>
1.115 + * <li>expose a virtual property named {@code length} on Java arrays;</li>
1.116 + * <li>expose {@code dyn:new} on instances of {@link StaticClass} as calls to constructors, including those static class
1.117 + * objects that represent Java arrays (their constructors take a single {@code int} parameter representing the length of
1.118 + * the array to create);</li>
1.119 + * <li>expose static methods, fields, and properties of classes in a similar manner to how instance method, fields, and
1.120 + * properties are exposed, on {@link StaticClass} objects.</li>
1.121 + * <li>expose a virtual property named {@code static} on instances of {@link java.lang.Class} to access their
1.122 + * {@link StaticClass}.</li>
1.123 + * </ul>
1.124 + * <p><strong>Overloaded method resolution</strong> is performed automatically for property setters, methods, and
1.125 + * constructors. Additionally, manual overloaded method selection is supported by having a call site specify a name for
1.126 + * a method that contains an explicit signature, i.e. {@code dyn:getMethod:parseInt(String,int)}. You can use
1.127 + * non-qualified class names in such signatures regardless of those classes' packages, they will match any class with
1.128 + * the same non-qualified name. You only have to use a fully qualified class name in case non-qualified class names
1.129 + * would cause selection ambiguity (that is extremely rare).</p>
1.130 + * <p><strong>Variable argument invocation</strong> is handled for both methods and constructors.</p>
1.131 + * <p>Currently, only public fields and methods are supported. Any Lookup objects passed in the
1.132 + * {@link LinkRequest}s are ignored and {@link MethodHandles#publicLookup()} is used instead.</p>
1.133 + *
1.134 + * @author Attila Szegedi
1.135 + */
1.136 +public class BeansLinker implements GuardingDynamicLinker {
1.137 + private static final ClassValue<TypeBasedGuardingDynamicLinker> linkers = new ClassValue<TypeBasedGuardingDynamicLinker>() {
1.138 + @Override
1.139 + protected TypeBasedGuardingDynamicLinker computeValue(Class<?> clazz) {
1.140 + // If ClassValue.put() were public, we could just pre-populate with these known mappings...
1.141 + return
1.142 + clazz == Class.class ? new ClassLinker() :
1.143 + clazz == StaticClass.class ? new StaticClassLinker() :
1.144 + DynamicMethod.class.isAssignableFrom(clazz) ? new DynamicMethodLinker() :
1.145 + new BeanLinker(clazz);
1.146 + }
1.147 + };
1.148 +
1.149 + /**
1.150 + * Creates a new POJO linker.
1.151 + */
1.152 + public BeansLinker() {
1.153 + }
1.154 +
1.155 + /**
1.156 + * Returns a bean linker for a particular single class. Useful when you need to override or extend the behavior of
1.157 + * linking for some classes in your language runtime's linker, but still want to delegate to the default behavior in
1.158 + * some cases.
1.159 + * @param clazz the class
1.160 + * @return a bean linker for that class
1.161 + */
1.162 + public static TypeBasedGuardingDynamicLinker getLinkerForClass(Class<?> clazz) {
1.163 + return linkers.get(clazz);
1.164 + }
1.165 +
1.166 + @Override
1.167 + public GuardedInvocation getGuardedInvocation(LinkRequest request, final LinkerServices linkerServices)
1.168 + throws Exception {
1.169 + final CallSiteDescriptor callSiteDescriptor = request.getCallSiteDescriptor();
1.170 + final int l = callSiteDescriptor.getNameTokenCount();
1.171 + // All names conforming to the dynalang MOP should have at least two tokens, the first one being "dyn"
1.172 + if(l < 2 || "dyn" != callSiteDescriptor.getNameToken(CallSiteDescriptor.SCHEME)) {
1.173 + return null;
1.174 + }
1.175 +
1.176 + final Object receiver = request.getReceiver();
1.177 + if(receiver == null) {
1.178 + // Can't operate on null
1.179 + return null;
1.180 + }
1.181 + return getLinkerForClass(receiver.getClass()).getGuardedInvocation(request, linkerServices);
1.182 + }
1.183 +}
1.184 \ No newline at end of file
