nashorn/src/jdk/internal/dynalink/beans/StaticClass.java
author attila
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8008371: Fix Dynalink compiler warnings and whitespace Reviewed-by: jlaskey, sundar
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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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 * 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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   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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   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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   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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       You may obtain a copy of the Apache License at
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           http://www.apache.org/licenses/LICENSE-2.0
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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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   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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       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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       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.io.Serializable;
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/**
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 * Object that represents the static facet of a class (its static methods, properties, and fields, as well as
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 * construction of instances using "dyn:new"). Objects of this class are recognized by the {@link BeansLinker} as being
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 * special, and operations on them will be linked against the represented class' static facet. The "class" synthetic
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 * property is additionally recognized and returns the Java {@link Class} object, as per {@link #getRepresentedClass()}
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 * method. Conversely, {@link Class} objects exposed through {@link BeansLinker} expose the "static" synthetic property
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 * which returns an instance of this class.
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 */
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public class StaticClass implements Serializable {
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    private static final ClassValue<StaticClass> staticClasses = new ClassValue<StaticClass>() {
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        @Override
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        protected StaticClass computeValue(Class<?> type) {
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            return new StaticClass(type);
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        }
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    };
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    private static final long serialVersionUID = 1L;
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    private final Class<?> clazz;
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    /*private*/ StaticClass(Class<?> clazz) {
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        clazz.getClass(); // NPE check
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        this.clazz = clazz;
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    }
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    /**
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     * Retrieves the {@link StaticClass} instance for the specified class.
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     * @param clazz the class for which the static facet is requested.
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     * @return the {@link StaticClass} instance representing the specified class.
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     */
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    public static StaticClass forClass(Class<?> clazz) {
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        return staticClasses.get(clazz);
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    }
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    /**
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     * Returns the represented Java class.
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     * @return the represented Java class.
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     */
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    public Class<?> getRepresentedClass() {
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        return clazz;
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    }
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    @Override
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    public String toString() {
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        return "JavaClassStatics[" + clazz.getName() + "]";
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    }
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    private Object readResolve() {
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        return forClass(clazz);
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    }
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}