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A Minecraft Bukkit plugin aiming to provide an easy code API and skill editor for all server owners to create unique and fully custom classes and skills.
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/**
 * SkillAPI
 * com.sucy.skill.gui.tool.GUIHolder
 * 
 * The MIT License (MIT)
 * 

 * Copyright (c) 2016 Steven Sucy
 * 

 * 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 com.sucy.skill.gui.tool;

import com.sucy.skill.api.player.PlayerData;
import org.bukkit.entity.Player;
import org.bukkit.event.inventory.InventoryAction;
import org.bukkit.event.inventory.InventoryClickEvent;
import org.bukkit.event.inventory.InventoryCloseEvent;
import org.bukkit.event.inventory.InventoryDragEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.InventoryHolder;
import org.bukkit.inventory.ItemStack;

import java.util.HashMap;

public abstract class GUIHolder implements InventoryHolder {
    protected HashMap data = new HashMap<>();

    protected GUIData    gui;
    protected PlayerData player;
    protected Inventory  inventory;
    protected int        page;

    public void set(GUIData gui, PlayerData player, Inventory inv, HashMap data) {
        this.gui = gui;
        this.player = player;
        this.inventory = inv;
        this.data = data;

        onSetup();
    }

    public T get(int slot) {
        String identifier = gui.getPage(page).get(slot);
        return identifier == null ? null : data.get(identifier);
    }

    public void next() {
        setPage((page + 1) % gui.getPages());
    }

    public void prev() {
        setPage((page + gui.getPages() - 1) % gui.getPages());
    }

    public void setPage(int page) {
        this.page = page;
        ItemStack[] contents = gui.getPage(page).instance(player, data);
        if (gui.getPages() > 1)
            GUITool.addPageButtons(contents);
        inventory.setContents(contents);
    }

    public void handleDrag(InventoryDragEvent event) {
        event.setCancelled(true);
    }

    @SuppressWarnings("unchecked")
    public void handleClick(InventoryClickEvent event) {
        event.setCancelled(true);
        boolean top    = event.getRawSlot() < event.getView().getTopInventory().getSize();
        T       result = get(event.getSlot());
        if (top && result != null && result.isAllowed((Player) event.getWhoClicked())) {
            if (event.getAction() == InventoryAction.HOTBAR_MOVE_AND_READD
                    || event.getAction() == InventoryAction.HOTBAR_SWAP)
                onHotBar(result, event.getSlot(), event.getHotbarButton());
            else
                onClick(result, event.getSlot(), event.isLeftClick(), event.isShiftClick());
        } else if (top && gui.getPages() > 1) {
            if (gui.getSize() == 9) {
                if (event.getSlot() == 7)
                    prev();
                if (event.getSlot() == 8)
                    next();
            } else if (event.getSlot() == 8)
                prev();
            else if (event.getSlot() == 17)
                next();
        }
    }

    public void handleClose(InventoryCloseEvent event) {
        onClose((Player) event.getPlayer());
    }

    protected abstract void onClick(T type, int slot, boolean left, boolean shift);

    protected void onHotBar(T type, int from, int to) {}

    protected void onSetup() {}

    protected void onClose(Player player) {}

    @Override
    public Inventory getInventory() {
        return inventory;
    }
}