/*
 * This file is part of jGui API, licensed under the MIT License (MIT).
 *
 * Copyright (c) 2016 johni0702 <https://github.com/johni0702>
 * Copyright (c) contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package de.johni0702.minecraft.gui.utils;

import de.johni0702.minecraft.gui.function.Focusable;

import java.util.Arrays;
import java.util.HashSet;

import static com.google.common.base.Preconditions.checkArgument;

public class Utils {
    /**
     * Link the specified focusable compontents in the order they're supplied.
     * @param focusables Focusables to link
     * @see Focusable#setNext(Focusable)
     * @see Focusable#setPrevious(Focusable)
     */
    public static void link(Focusable... focusables) {
        checkArgument(new HashSet<>(Arrays.asList(focusables)).size() == focusables.length, "focusables must be unique and not null");
        for (int i = 0; i < focusables.length; i++) {
            Focusable next = focusables[(i + 1) % focusables.length];
            focusables[i].setNext(next);
            next.setPrevious(focusables[i]);
        }
    }
}

Add utility method for linking Focusable components of a GUI
Add utility method for linking Focusable components of a GUI
