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