author | attila |
Tue, 15 Oct 2013 15:57:14 +0200 | |
changeset 20945 | 11a1b6dc9893 |
parent 18876 | ada98218aaae |
child 24778 | 2ff5d7041566 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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/* |
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* This file is available under and governed by the GNU General Public |
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* License version 2 only, as published by the Free Software Foundation. |
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* However, the following notice accompanied the original version of this |
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* file, and Oracle licenses the original version of this file under the BSD |
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* license: |
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*/ |
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/* |
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Copyright 2009-2013 Attila Szegedi |
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|
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Licensed under both the Apache License, Version 2.0 (the "Apache License") |
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and the BSD License (the "BSD License"), with licensee being free to |
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choose either of the two at their discretion. |
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|
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You may not use this file except in compliance with either the Apache |
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License or the BSD License. |
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|
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If you choose to use this file in compliance with the Apache License, the |
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following notice applies to you: |
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|
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You may obtain a copy of the Apache License at |
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|
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http://www.apache.org/licenses/LICENSE-2.0 |
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|
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Unless required by applicable law or agreed to in writing, software |
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distributed under the License is distributed on an "AS IS" BASIS, |
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
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implied. See the License for the specific language governing |
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permissions and limitations under the License. |
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|
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If you choose to use this file in compliance with the BSD License, the |
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following notice applies to you: |
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|
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions are |
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met: |
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* Redistributions of source code must retain the above copyright |
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notice, this list of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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* Neither the name of the copyright holder nor the names of |
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contributors may be used to endorse or promote products derived from |
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this software without specific prior written permission. |
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|
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
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BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
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BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package jdk.internal.dynalink.beans; |
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import java.lang.invoke.MethodHandles; |
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import java.util.Collection; |
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import java.util.Collections; |
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import jdk.internal.dynalink.CallSiteDescriptor; |
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import jdk.internal.dynalink.DynamicLinkerFactory; |
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import jdk.internal.dynalink.linker.GuardedInvocation; |
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import jdk.internal.dynalink.linker.GuardingDynamicLinker; |
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import jdk.internal.dynalink.linker.LinkRequest; |
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import jdk.internal.dynalink.linker.LinkerServices; |
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import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker; |
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|
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/** |
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* A linker for POJOs. Normally used as the ultimate fallback linker by the {@link DynamicLinkerFactory} so it is given |
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* the chance to link calls to all objects that no other language runtime recognizes. Specifically, this linker will: |
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* <ul> |
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* <li>expose all public methods of form {@code setXxx()}, {@code getXxx()}, and {@code isXxx()} as property setters and |
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* getters for {@code dyn:setProp} and {@code dyn:getProp} operations;</li> |
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* <li>expose all public methods for invocation through {@code dyn:callMethod} operation;</li> |
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* <li>expose all public methods for retrieval for {@code dyn:getMethod} operation; the methods thus retrieved can then |
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* be invoked using {@code dyn:call};</li> |
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* <li>expose all public fields as properties, unless there are getters or setters for the properties of the same name;</li> |
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* <li>expose {@code dyn:getLength}, {@code dyn:getElem} and {@code dyn:setElem} on native Java arrays, as well as |
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* {@link java.util.List} and {@link java.util.Map} objects; ({@code dyn:getLength} works on any |
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* {@link java.util.Collection});</li> |
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* <li>expose a virtual property named {@code length} on Java arrays;</li> |
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* <li>expose {@code dyn:new} on instances of {@link StaticClass} as calls to constructors, including those static class |
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* objects that represent Java arrays (their constructors take a single {@code int} parameter representing the length of |
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* the array to create);</li> |
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* <li>expose static methods, fields, and properties of classes in a similar manner to how instance method, fields, and |
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* properties are exposed, on {@link StaticClass} objects.</li> |
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* <li>expose a virtual property named {@code static} on instances of {@link java.lang.Class} to access their |
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* {@link StaticClass}.</li> |
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* </ul> |
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* <p><strong>Overloaded method resolution</strong> is performed automatically for property setters, methods, and |
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* constructors. Additionally, manual overloaded method selection is supported by having a call site specify a name for |
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* a method that contains an explicit signature, i.e. {@code dyn:getMethod:parseInt(String,int)}. You can use |
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* non-qualified class names in such signatures regardless of those classes' packages, they will match any class with |
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* the same non-qualified name. You only have to use a fully qualified class name in case non-qualified class names |
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* would cause selection ambiguity (that is extremely rare).</p> |
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* <p><strong>Variable argument invocation</strong> is handled for both methods and constructors.</p> |
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* <p>Currently, only public fields and methods are supported. Any Lookup objects passed in the |
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* {@link LinkRequest}s are ignored and {@link MethodHandles#publicLookup()} is used instead.</p> |
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* |
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* @author Attila Szegedi |
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*/ |
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public class BeansLinker implements GuardingDynamicLinker { |
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private static final ClassValue<TypeBasedGuardingDynamicLinker> linkers = new ClassValue<TypeBasedGuardingDynamicLinker>() { |
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@Override |
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protected TypeBasedGuardingDynamicLinker computeValue(Class<?> clazz) { |
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// If ClassValue.put() were public, we could just pre-populate with these known mappings... |
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return |
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clazz == Class.class ? new ClassLinker() : |
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clazz == StaticClass.class ? new StaticClassLinker() : |
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DynamicMethod.class.isAssignableFrom(clazz) ? new DynamicMethodLinker() : |
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new BeanLinker(clazz); |
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} |
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}; |
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|
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/** |
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* Creates a new POJO linker. |
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*/ |
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public BeansLinker() { |
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} |
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|
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/** |
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* Returns a bean linker for a particular single class. Useful when you need to override or extend the behavior of |
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* linking for some classes in your language runtime's linker, but still want to delegate to the default behavior in |
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* some cases. |
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* @param clazz the class |
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* @return a bean linker for that class |
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*/ |
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public static TypeBasedGuardingDynamicLinker getLinkerForClass(Class<?> clazz) { |
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return linkers.get(clazz); |
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} |
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/** |
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* Returns true if the object is a Dynalink Java dynamic method. |
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* |
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* @param obj the object we want to test for being a dynamic method |
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* @return true if it is a dynamic method, false otherwise. |
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*/ |
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public static boolean isDynamicMethod(final Object obj) { |
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return obj instanceof DynamicMethod; |
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} |
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|
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/** |
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* Returns a collection of names of all readable instance properties of a class. |
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* @param clazz the class |
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* @return a collection of names of all readable instance properties of a class. |
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*/ |
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public static Collection<String> getReadableInstancePropertyNames(Class<?> clazz) { |
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TypeBasedGuardingDynamicLinker linker = getLinkerForClass(clazz); |
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if(linker instanceof BeanLinker) { |
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return ((BeanLinker)linker).getReadablePropertyNames(); |
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} |
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return Collections.emptySet(); |
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} |
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|
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/** |
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* Returns a collection of names of all writable instance properties of a class. |
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* @param clazz the class |
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* @return a collection of names of all writable instance properties of a class. |
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*/ |
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public static Collection<String> getWritableInstancePropertyNames(Class<?> clazz) { |
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TypeBasedGuardingDynamicLinker linker = getLinkerForClass(clazz); |
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if(linker instanceof BeanLinker) { |
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return ((BeanLinker)linker).getWritablePropertyNames(); |
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} |
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return Collections.emptySet(); |
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} |
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|
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/** |
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* Returns a collection of names of all instance methods of a class. |
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* @param clazz the class |
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* @return a collection of names of all instance methods of a class. |
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*/ |
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public static Collection<String> getInstanceMethodNames(Class<?> clazz) { |
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TypeBasedGuardingDynamicLinker linker = getLinkerForClass(clazz); |
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if(linker instanceof BeanLinker) { |
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return ((BeanLinker)linker).getMethodNames(); |
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} |
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return Collections.emptySet(); |
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} |
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|
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/** |
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* Returns a collection of names of all readable static properties of a class. |
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* @param clazz the class |
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* @return a collection of names of all readable static properties of a class. |
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*/ |
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public static Collection<String> getReadableStaticPropertyNames(Class<?> clazz) { |
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return StaticClassLinker.getReadableStaticPropertyNames(clazz); |
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} |
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|
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/** |
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* Returns a collection of names of all writable static properties of a class. |
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* @param clazz the class |
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* @return a collection of names of all writable static properties of a class. |
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*/ |
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public static Collection<String> getWritableStaticPropertyNames(Class<?> clazz) { |
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return StaticClassLinker.getWritableStaticPropertyNames(clazz); |
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} |
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|
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/** |
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* Returns a collection of names of all static methods of a class. |
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* @param clazz the class |
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* @return a collection of names of all static methods of a class. |
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*/ |
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public static Collection<String> getStaticMethodNames(Class<?> clazz) { |
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return StaticClassLinker.getStaticMethodNames(clazz); |
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} |
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@Override |
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public GuardedInvocation getGuardedInvocation(LinkRequest request, final LinkerServices linkerServices) |
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throws Exception { |
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final CallSiteDescriptor callSiteDescriptor = request.getCallSiteDescriptor(); |
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final int l = callSiteDescriptor.getNameTokenCount(); |
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// All names conforming to the dynalang MOP should have at least two tokens, the first one being "dyn" |
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if(l < 2 || "dyn" != callSiteDescriptor.getNameToken(CallSiteDescriptor.SCHEME)) { |
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return null; |
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} |
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|
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final Object receiver = request.getReceiver(); |
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if(receiver == null) { |
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// Can't operate on null |
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return null; |
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} |
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return getLinkerForClass(receiver.getClass()).getGuardedInvocation(request, linkerServices); |
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} |
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} |