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/*
 * Copyright (c) 2018-2021 Karlatemp. All rights reserved.
 * @author Karlatemp  
 *
 * MXLib/MXLib.mxlib-common.main/ToolkitCommon.java
 *
 * Use of this source code is governed by the MIT license that can be found via the following link.
 *
 * https://github.com/Karlatemp/MxLib/blob/master/LICENSE
 */

package io.github.karlatemp.mxlib.common.utils;

import io.github.karlatemp.mxlib.reflect.Reflections;
import io.github.karlatemp.unsafeaccessor.Root;

import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.function.Function;

@SuppressWarnings({"unchecked", "rawtypes"})
public class ToolkitCommon {
    private static final MethodHandles.Lookup LOOKUP = Root.getTrusted();
    public static final Function, Iterator> AS_ITERATOR = Reflections.findMethod(
            Enumeration.class,
            "asIterator",
            false,
            Iterator.class
    ).map(method -> Reflections.bindToNoErr(
            LOOKUP,
            Reflections.mapToHandle(method),
            Function.class,
            MethodType.methodType(Object.class, Object.class),
            "apply"
    )).orElse((Function, ?>) (Enumeration enu) -> {
        if (enu instanceof Iterator) return enu;
        return new Iterator() {
            @Override
            public boolean hasNext() {
                return enu.hasMoreElements();
            }

            @Override
            public Object next() {
                return enu.nextElement();
            }
        };
    });

    public static  Iterator asIterator(Enumeration entries) {
        return (Iterator) AS_ITERATOR.apply(entries);
    }
}