--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/src/jdk.dynalink/share/classes/jdk/dynalink/beans/BeansLinker.java Tue Nov 24 10:19:34 2015 +0100
@@ -0,0 +1,307 @@
+/*
+ * 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.dynalink.beans;
+
+import java.lang.invoke.MethodHandles.Lookup;
+import java.util.Collections;
+import java.util.Set;
+import jdk.dynalink.DynamicLinkerFactory;
+import jdk.dynalink.StandardOperation;
+import jdk.dynalink.linker.GuardedInvocation;
+import jdk.dynalink.linker.GuardingDynamicLinker;
+import jdk.dynalink.linker.LinkRequest;
+import jdk.dynalink.linker.LinkerServices;
+import jdk.dynalink.linker.TypeBasedGuardingDynamicLinker;
+
+/**
+ * A linker for ordinary Java objects. 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 linker recognized. 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
+ * {@link StandardOperation#SET_PROPERTY} and {@link StandardOperation#GET_PROPERTY}
+ * operations;</li>
+ * <li>expose all public methods for invocation through
+ * {@link StandardOperation#CALL_METHOD} operation;</li>
+ * <li>expose all public methods for retrieval for
+ * {@link StandardOperation#GET_METHOD} operation; the methods thus retrieved
+ * can then be invoked using {@link StandardOperation#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 {@link StandardOperation#GET_LENGTH},
+ * {@link StandardOperation#GET_ELEMENT} and {@link StandardOperation#SET_ELEMENT}
+ * on native Java arrays, as well as {@link java.util.List} and
+ * {@link java.util.Map} objects; ({@link StandardOperation#GET_LENGTH} works on
+ * any {@link java.util.Collection});</li>
+ * <li>expose a virtual property named {@code length} on Java arrays;</li>
+ * <li>expose {@link StandardOperation#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 NamedMethod(GET_METHOD, "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). Overloaded
+ * resolution for constructors is not automatic as there is no logical place to
+ * attach that functionality to but if a language wishes to provide this
+ * functionality, it can use {@link #getConstructorMethod(Class, String)} as a
+ * useful building block for it.</p>
+ * <p><strong>Variable argument invocation</strong> is handled for both methods
+ * and constructors.</p>
+ * <p><strong>Caller sensitive methods</strong> can be linked as long as they
+ * are otherwise public and link requests have call site descriptors carrying
+ * full-strength {@link Lookup} objects and not weakened lookups or the public
+ * lookup.</p>
+ * <p>The class also exposes various static methods for discovery of available
+ * property and method names on classes and class instances, as well as access
+ * to per-class linkers using the {@link #getLinkerForClass(Class)}
+ * method.</p>
+ */
+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 beans 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 Java dynamic method (e.g., one
+ * obtained through a {@code GET_METHOD} operation on a Java object or
+ * {@link StaticClass} or through
+ * {@link #getConstructorMethod(Class, String)}.
+ *
+ * @param obj the object we want to test for being a Java 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 Java constructor (obtained through
+ * {@link #getConstructorMethod(Class, String)}}.
+ *
+ * @param obj the object we want to test for being a Java 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. This method is useful for exposing a functionality for
+ * selecting an overloaded constructor based on an explicit signature, as
+ * this functionality is not otherwise exposed by Dynalink as
+ * {@link StaticClass} objects act as overloaded constructors without
+ * explicit signature selection. Example usage would be:
+ * {@code getConstructorMethod(java.awt.Color.class, "int, int, int")}.
+ * @param clazz the class
+ * @param signature full signature of the constructor. Note how you can use
+ * names of primitive types, array names with normal Java notation (e.g.
+ * {@code "int[]"}), and normally you can even use unqualified class names
+ * (e.g. {@code "String, List"} instead of
+ * {@code "java.lang.String, java.util.List"} as long as they don't cause
+ * ambiguity in the specific parameter position.
+ * @return dynamic method for the constructor or null if no constructor with
+ * the specified signature exists.
+ */
+ public static Object getConstructorMethod(final Class<?> clazz, final String signature) {
+ return StaticClassLinker.getConstructorMethod(clazz, signature);
+ }
+
+ /**
+ * Returns a set of names of all readable instance properties of a class.
+ * @param clazz the class
+ * @return a set of names of all readable instance properties of a class.
+ */
+ public static Set<String> getReadableInstancePropertyNames(final Class<?> clazz) {
+ final TypeBasedGuardingDynamicLinker linker = getLinkerForClass(clazz);
+ if(linker instanceof BeanLinker) {
+ return ((BeanLinker)linker).getReadablePropertyNames();
+ }
+ return Collections.emptySet();
+ }
+
+ /**
+ * Returns a set of names of all writable instance properties of a class.
+ * @param clazz the class
+ * @return a set of names of all writable instance properties of a class.
+ */
+ public static Set<String> getWritableInstancePropertyNames(final Class<?> clazz) {
+ final TypeBasedGuardingDynamicLinker linker = getLinkerForClass(clazz);
+ if(linker instanceof BeanLinker) {
+ return ((BeanLinker)linker).getWritablePropertyNames();
+ }
+ return Collections.emptySet();
+ }
+
+ /**
+ * Returns a set of names of all instance methods of a class.
+ * @param clazz the class
+ * @return a set of names of all instance methods of a class.
+ */
+ public static Set<String> getInstanceMethodNames(final Class<?> clazz) {
+ final TypeBasedGuardingDynamicLinker linker = getLinkerForClass(clazz);
+ if(linker instanceof BeanLinker) {
+ return ((BeanLinker)linker).getMethodNames();
+ }
+ return Collections.emptySet();
+ }
+
+ /**
+ * Returns a set of names of all readable static properties of a class.
+ * @param clazz the class
+ * @return a set of names of all readable static properties of a class.
+ */
+ public static Set<String> getReadableStaticPropertyNames(final Class<?> clazz) {
+ return StaticClassLinker.getReadableStaticPropertyNames(clazz);
+ }
+
+ /**
+ * Returns a set of names of all writable static properties of a class.
+ * @param clazz the class
+ * @return a set of names of all writable static properties of a class.
+ */
+ public static Set<String> getWritableStaticPropertyNames(final Class<?> clazz) {
+ return StaticClassLinker.getWritableStaticPropertyNames(clazz);
+ }
+
+ /**
+ * Returns a set of names of all static methods of a class.
+ * @param clazz the class
+ * @return a set of names of all static methods of a class.
+ */
+ public static Set<String> getStaticMethodNames(final Class<?> clazz) {
+ return StaticClassLinker.getStaticMethodNames(clazz);
+ }
+
+ @Override
+ public GuardedInvocation getGuardedInvocation(final LinkRequest request, final LinkerServices linkerServices)
+ throws Exception {
+ final Object receiver = request.getReceiver();
+ if(receiver == null) {
+ // Can't operate on null
+ return null;
+ }
+ return getLinkerForClass(receiver.getClass()).getGuardedInvocation(request, linkerServices);
+ }
+}