Java example source code file (SimpleDynamicMethod.java)

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Java - Java tags/keywords

class, methodhandle, methodtype, override, simpledynamicmethod, singledynamicmethod, string

The SimpleDynamicMethod.java Java example source code

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * 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).
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/*
 * 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
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       WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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       ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

package jdk.internal.dynalink.beans;

import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles.Lookup;
import java.lang.invoke.MethodType;

/**
 * A dynamic method bound to exactly one Java method or constructor that is not caller sensitive. Since its target is
 * not caller sensitive, this class pre-caches its method handle and always returns it from the call to
 * {@link #getTarget(Lookup)}. Can be used in general to represents dynamic methods bound to a single method handle,
 * even if that handle is not mapped to a Java method, i.e. as a wrapper around field getters/setters, array element
 * getters/setters, etc.
 *
 * @author Attila Szegedi
 */
class SimpleDynamicMethod extends SingleDynamicMethod {
    private final MethodHandle target;

    /**
     * Creates a new simple dynamic method, with a name constructed from the class name, method name, and handle
     * signature.
     *
     * @param target the target method handle
     * @param clazz the class declaring the method
     * @param name the simple name of the method
     */
    SimpleDynamicMethod(MethodHandle target, Class<?> clazz, String name) {
        super(getName(target, clazz, name));
        this.target = target;
    }

    private static String getName(MethodHandle target, Class<?> clazz, String name) {
        return getMethodNameWithSignature(target.type(), getClassAndMethodName(clazz, name));
    }

    @Override
    boolean isVarArgs() {
        return target.isVarargsCollector();
    }

    @Override
    MethodType getMethodType() {
        return target.type();
    }

    @Override
    MethodHandle getTarget(Lookup lookup) {
        return target;
    }
}