How to use essentials kits api

Check this code

Code:java

package com.elmakers.mine.bukkit.essentials;
 
import com.earth2me.essentials.ItemDb;
import com.elmakers.mine.bukkit.api.spell.SpellCategory;
import com.elmakers.mine.bukkit.magic.MagicController;
import com.elmakers.mine.bukkit.wand.Wand;
import net.ess3.api.IEssentials;
import org.bukkit.inventory.ItemStack;
 
public class MagicItemDb extends ItemDb
{
  private final MagicController controller;
 
  public MagicItemDb(MagicController controller, Object ess)
  {
    super((IEssentials)ess);
    this.controller = controller;
    reloadConfig();
  }
 
  public ItemStack get(String id)
    throws Exception
  {
    if (id.equals("wand")) {
      Wand wand = Wand.createWand(this.controller, "");
      if (wand != null)
        return wand.getItem();
    }
    else if (id.startsWith("wand:")) {
      String wandId = id.replace("wand:", "");
      Wand wand = Wand.createWand(this.controller, wandId.trim());
      if (wand != null) {
        return wand.getItem();
      }
    }
    else if (id.startsWith("w:")) {
      String wandId = id.replace("w:", "");
      Wand wand = Wand.createWand(this.controller, wandId.trim());
      if (wand != null) {
        return wand.getItem();
      }
    }
    else if (id.startsWith("book:")) {
      String bookCategory = id.replace("book:", "");
      SpellCategory category = null;
      if ((bookCategory.length() > 0) && (!bookCategory.equalsIgnoreCase("all"))) {
        category = this.controller.getCategory(bookCategory);
      }
      ItemStack bookItem = this.controller.getSpellBook(category, 1);
      if (bookItem != null)
        return bookItem;
    }
    else if (id.startsWith("spell:")) {
      String spellKey = id.replace("spell:", "");
      ItemStack itemStack = Wand.createSpellItem(spellKey, this.controller, null, true);
      if (itemStack != null)
        return itemStack;
    }
    else if (id.startsWith("s:")) {
      String spellKey = id.replace("s:", "");
      ItemStack itemStack = Wand.createSpellItem(spellKey, this.controller, null, true);
      if (itemStack != null)
        return itemStack;
    }
    else if (id.startsWith("brush:")) {
      String brushKey = id.replace("brush:", "");
      ItemStack itemStack = Wand.createBrushItem(brushKey, this.controller, null, true);
      if (itemStack != null)
        return itemStack;
    }
    else if (id.startsWith("upgrade:")) {
      String wandId = id.replace("upgrade:", "");
      Wand wand = Wand.createWand(this.controller, wandId.trim());
      if (wand != null) {
        wand.makeUpgrade();
        return wand.getItem();
      }
    } else if (id.startsWith("item:")) {
      String wandId = id.replace("item:", "");
      return this.controller.createItem(wandId);
    }
 
    return super.get(id);
  }
}

its from plugin MAGIC, but i cant make it work, any help implementing it in a plugin?

 

So you didn't even write this?