StaticClassIntrospector.java

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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
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/*
   Copyright 2009-2013 Attila Szegedi

   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.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

class StaticClassIntrospector extends FacetIntrospector {
    StaticClassIntrospector(final Class<?> clazz) {
        super(clazz, false);
    }

    @Override
    Map<String, MethodHandle> getInnerClassGetters() {
        final Map<String, MethodHandle> map = new HashMap<>();
        for(final Class<?> innerClass: membersLookup.getInnerClasses()) {
            map.put(innerClass.getSimpleName(), editMethodHandle(MethodHandles.constant(StaticClass.class,
                    StaticClass.forClass(innerClass))));
        }
        return map;
    }

    @Override Collection<Method> getRecordComponentGetters() {
        return List.of();
    }

    @Override
    MethodHandle editMethodHandle(final MethodHandle mh) {
        return editStaticMethodHandle(mh);
    }

    static MethodHandle editStaticMethodHandle(final MethodHandle mh) {
        return dropReceiver(mh, Object.class);
    }

    static MethodHandle editConstructorMethodHandle(final MethodHandle cmh) {
        return dropReceiver(cmh, StaticClass.class);
    }

    private static MethodHandle dropReceiver(final MethodHandle mh, final Class<?> receiverClass) {
        MethodHandle newHandle = MethodHandles.dropArguments(mh, 0, receiverClass);
        // NOTE: this is a workaround for the fact that dropArguments doesn't preserve vararg collector state.
        if(mh.isVarargsCollector() && !newHandle.isVarargsCollector()) {
            final MethodType type = mh.type();
            newHandle = newHandle.asVarargsCollector(type.parameterType(type.parameterCount() - 1));
        }
        return newHandle;
    }
}