Create Inventory Using Code

Creating custom inventory

import io.github.lucfr1746.llibrary.inventory.InventoryBuilder;
import org.bukkit.inventory.MenuType;

public class CustomInventory extends InventoryBuilder {

    public CustomInventory() {
        setId("custom_inventory");         // default is random uuid
        setLockMode(LockMode.ALL);         // default is LockMode.ALL
        setMenuType(MenuType.GENERIC_9X6); // default is MenuType.GENERIC_9x3
        setTitle("Custom Inventory");      // default is ""
    }
}

Now an inventory named "Custom Inventory" has been created!

Adding open commands

import io.github.lucfr1746.llibrary.inventory.InventoryBuilder;
import org.bukkit.inventory.MenuType;

import java.util.ArrayList;

public class CustomInventory extends InventoryBuilder {

    public CustomInventory() {
        setId("custom_inventory");         // default is random uuid
        setLockMode(LockMode.ALL);         // default is LockMode.ALL
        setMenuType(MenuType.GENERIC_9X6); // default is MenuType.GENERIC_9x3
        setTitle("Custom Inventory");      // default is ""

        registerCommands();
    }

    private void registerCommands() {
        setOpenCommands(new ArrayList<String>("custom", "command"));
    }
}

The inventory already has command. Now before player can use command /custom or /inventory to open, we have to register the inventory through Inventory Manager.

import io.github.lucfr1746.llibrary.LLibrary;

public CustomInventory() {
    setId("custom_inventory");         // default is random uuid
    setLockMode(LockMode.ALL);         // default is LockMode.ALL
    setMenuType(MenuType.GENERIC_9X6); // default is MenuType.GENERIC_9x3
    setTitle("Custom Inventory");      // default is ""

    registerCommands();

    LLibrary.getInventoryManager().registerInventoryBuilder(this);
}

You are good to go now, remember to call new CustomInventory() somewhere in your plugin before it actually works.

Now, you want to add some features such as open requirements, open actions, and button with functionality? Let's straight into it!

Adding open requirements

import io.github.lucfr1746.llibrary.inventory.InventoryBuilder;
import io.github.lucfr1746.llibrary.requirement.Requirement;
import io.github.lucfr1746.llibrary.requirement.list.HasLevelRequirement;
import io.github.lucfr1746.llibrary.requirement.list.HasPermissionRequirement;
import org.bukkit.inventory.MenuType;

import java.util.ArrayList;

public class CustomInventory extends InventoryBuilder {

    public CustomInventory() {
        setId("custom_inventory");         // default is random uuid
        setLockMode(LockMode.ALL);         // default is LockMode.ALL
        setMenuType(MenuType.GENERIC_9X6); // default is MenuType.GENERIC_9x3
        setTitle("Custom Inventory");      // default is ""

        registerRequirements();
    }

    // After this, player must have permission of "permission"
    // and level higher or equal to 10 to open the inventory.
    private void registerRequirements() {
        List<Requirement> requirementList = new ArrayList<>();
        requirementList.add(new HasPermissionRequirement("permission"));
        requirementList.add(new HasLevelRequirement(10));
        setOpenRequirements(requirementList);
    }

    // Or create a requirement with deny actions
    // Player without permission "permission" will be sent a message "Deny"
    // when trying to open the inventory.
    private void registerRequirements() {
        HasPermissionRequirement permissionRequirement = new HasPermissionRequirement("permission");
        requirement.setDenyHandler(new ArrayList<Action>(new MessageAction("&cDeny!")));
        
        setOpenRequirements(new ArrayList<Requirement>(permissionRequirement));
    }
}

Adding open actions

import io.github.lucfr1746.llibrary.action.Action;
import io.github.lucfr1746.llibrary.action.list.GiveMoneyAction;
import io.github.lucfr1746.llibrary.action.list.MessageAction;
import io.github.lucfr1746.llibrary.inventory.InventoryBuilder;
import org.bukkit.inventory.MenuType;

import java.util.ArrayList;

public class CustomInventory extends InventoryBuilder {

    public CustomInventory() {
        setId("custom_inventory");         // default is random uuid
        setLockMode(LockMode.ALL);         // default is LockMode.ALL
        setMenuType(MenuType.GENERIC_9X6); // default is MenuType.GENERIC_9x3
        setTitle("Custom Inventory");      // default is ""

        registerOpenActions();
    }

    // The Player will receive a message "You opened the inventory!"
    // and $100 money (Required VaultAPI) after the inventory has been opened.
    private void registerOpenActions() {
        List<Action> actionList = new ArrayList<>();
        actionList.add(new MessageAction("&aYou opened the inventory!"));
        actionList.add(new GiveMoneyAction(100));
        setOpenActions(actionList);
    }
}

Adding a button with functionality to the inventory

import io.github.lucfr1746.llibrary.inventory.InventoryBuilder;
import io.github.lucfr1746.llibrary.inventory.InventoryButton;
import io.github.lucfr1746.llibrary.itemstack.ItemBuilder;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.inventory.MenuType;

import java.util.ArrayList;

public class CustomInventory extends InventoryBuilder {

    public CustomInventory() {
        setId("custom_inventory");         // default is random uuid
        setLockMode(LockMode.ALL);         // default is LockMode.ALL
        setMenuType(MenuType.GENERIC_9X6); // default is MenuType.GENERIC_9x3
        setTitle("Custom Inventory");      // default is ""

        addButton();
    }

    private void addButton() {
        addButton(49, closeButton());
    }

    // Create a button with id "close", priority of "1" and required permission "permission" to view.
    // The creator is the interface of the button, in this it is a barrier named "Close"
    // The consumer is the function of the button, in this, it closes the inventory when the player clicked.
    private InventoryButton closeButton() {
        return new InventoryButton()
                .id("close")
                .priority(0)
                .viewRequirements(new ArrayList<Requirement>(new HasPermissionRequirement("permission")))
                .creator(player -> {
                    new ItemBuilder(Material.BARRIER)
                            .setDisplayName("&cClose")
                            .build();
                })
                .consumer(event -> {
                    Player player = (Player) event.getWhoClicked(); 
                    player.closeInventory();
                    player.sendMessage("Your closed the inventory!");
                });
    }
}

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Author: lucfr1746