nashorn/src/jdk/internal/dynalink/beans/SimpleDynamicMethod.java
author attila
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8010946: AccessControl.doPrivileged is broken when called from js script 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.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles.Lookup;
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import java.lang.invoke.MethodType;
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/**
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 * A dynamic method bound to exactly one Java method or constructor that is not caller sensitive. Since its target is
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 * not caller sensitive, this class pre-caches its method handle and always returns it from the call to
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 * {@link #getTarget(Lookup)}. Can be used in general to represents dynamic methods bound to a single method handle,
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 * even if that handle is not mapped to a Java method, i.e. as a wrapper around field getters/setters, array element
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 * getters/setters, etc.
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 *
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 * @author Attila Szegedi
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 */
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class SimpleDynamicMethod extends SingleDynamicMethod {
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    private final MethodHandle target;
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    /**
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     * Creates a new simple dynamic method, with a name constructed from the class name, method name, and handle
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     * signature.
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     *
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     * @param target the target method handle
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     * @param clazz the class declaring the method
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     * @param name the simple name of the method
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     */
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    SimpleDynamicMethod(MethodHandle target, Class<?> clazz, String name) {
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        super(getName(target, clazz, name));
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        this.target = target;
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    }
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    private static String getName(MethodHandle target, Class<?> clazz, String name) {
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        return getMethodNameWithSignature(target.type(), getClassAndMethodName(clazz, name));
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    }
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    @Override
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    boolean isVarArgs() {
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        return target.isVarargsCollector();
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    }
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    @Override
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    MethodType getMethodType() {
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        return target.type();
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    }
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    @Override
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    MethodHandle getTarget(Lookup lookup) {
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        return target;
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    }
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}