| /* |
| * 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.io.Serializable; |
| import java.util.Objects; |
| import jdk.dynalink.StandardOperation; |
| |
| /** |
| * Object that allows access to the static members of a class (its static |
| * methods, properties, and fields), as well as construction of instances using |
| * {@link StandardOperation#NEW} operation. In Dynalink, {@link Class} objects |
| * are not treated specially and act as ordinary Java objects; you can use e.g. |
| * {@code GET:PROPERTY:superclass} as a property getter to |
| * invoke {@code clazz.getSuperclass()}. On the other hand, you can not use |
| * {@code Class} objects to access static members of a class, nor to create new |
| * instances of the class using {@code NEW}. This is consistent with how |
| * {@code Class} objects behave in Java: in Java, you write e.g. |
| * {@code new BitSet()} instead of {@code new BitSet.class()}. Similarly, you |
| * write {@code System.out} and not {@code System.class.out}. It is this aspect |
| * of using a class name as the constructor and a namespace for static members |
| * that {@code StaticClass} embodies. |
| * <p> |
| * Objects of this class are recognized by the {@link BeansLinker} as being |
| * special, and operations on them will be linked against the represented class' |
| * static members. The {@code "class"} synthetic property is additionally |
| * recognized and returns the Java {@link Class} object, just as in Java |
| * {@code System.class} evaluates to the {@code Class} object for the |
| * {@code} System class. Conversely, {@link Class} objects exposed through |
| * {@link BeansLinker} expose the {@code "static"} synthetic property which |
| * returns their {@code StaticClass} object (there is no equivalent to this in |
| * Java). |
| * <p> |
| * In summary, instances of this class act as namespaces for static members and |
| * as constructors for classes, much the same way as specifying a class name in |
| * Java language does, except that in Java this is just a syntactic element, |
| * while in Dynalink they are expressed as actual objects. |
| * <p>{@code StaticClass} objects representing Java array types will act as |
| * constructors taking a single int argument and create an array of the |
| * specified size. |
| * <p> |
| * If the class has several constructors, {@link StandardOperation#NEW} on |
| * {@code StaticClass} will try to select the most specific applicable |
| * constructor. You might want to expose a mechanism in your language for |
| * selecting a constructor with an explicit signature through |
| * {@link BeansLinker#getConstructorMethod(Class, String)}. |
| */ |
| public final class StaticClass implements Serializable { |
| private static final ClassValue<StaticClass> staticClasses = new ClassValue<StaticClass>() { |
| @Override |
| protected StaticClass computeValue(final Class<?> type) { |
| return new StaticClass(type); |
| } |
| }; |
| |
| private static final long serialVersionUID = 1L; |
| |
| /** |
| * The runtime {@code Class} object whose static members this |
| * {@code StaticClass} represents. |
| */ |
| private final Class<?> clazz; |
| |
| /*private*/ StaticClass(final Class<?> clazz) { |
| this.clazz = Objects.requireNonNull(clazz); |
| } |
| |
| /** |
| * Retrieves the {@link StaticClass} instance for the specified class. |
| * @param clazz the class for which the static facet is requested. |
| * @return the {@link StaticClass} instance representing the specified class. |
| */ |
| public static StaticClass forClass(final Class<?> clazz) { |
| return staticClasses.get(clazz); |
| } |
| |
| /** |
| * Returns the represented Java class. |
| * @return the represented Java class. |
| */ |
| public Class<?> getRepresentedClass() { |
| return clazz; |
| } |
| |
| @Override |
| public String toString() { |
| return "StaticClass[" + clazz.getName() + "]"; |
| } |
| |
| /** |
| * Returns {@link #forClass(Class)} for the underlying {@code clazz} field |
| * ensuring that deserialization doesn't create non-canonical instances. |
| * @return {@link #forClass(Class)} for the underlying {@code clazz} field. |
| */ |
| private Object readResolve() { |
| return forClass(clazz); |
| } |
| } |