PlayerUtils.java

/**
 * Copyright (c) Lambda Innovation, 2013-2015
 * 本作品版权由Lambda Innovation所有。
 * http://www.li-dev.cn/
 *
 * This project is open-source, and it is distributed under  
 * the terms of GNU General Public License. You can modify
 * and distribute freely as long as you follow the license.
 * 本项目是一个开源项目，且遵循GNU通用公共授权协议。
 * 在遵照该协议的情况下，您可以自由传播和修改。
 * http://www.gnu.org/licenses/gpl.html
 */
package cn.liutils.util.mc;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.InventoryPlayer;
import net.minecraft.item.ItemStack;
import net.minecraft.util.MovingObjectPosition;
import net.minecraft.util.Vec3;
import cn.liutils.util.helper.Motion3D;

/**
 * Utils that are built around a player.
 * @author WeAthFolD
 */
public class PlayerUtils {
    
    /**
     * Try to merge an itemStack into the player inventory. The merging uses strict
     * equality, that is, only when item instances are equal and NBT datas are equal can 
     * this stack merge to an another stack in the inventory.
     * Return: how many not merged
     */
    public static int mergeStackable(InventoryPlayer inv, ItemStack stack) {
        for(int i = 0; i < inv.getSizeInventory() - 4 && stack.stackSize > 0; ++i) {
            ItemStack is = inv.getStackInSlot(i);
            if(is != null && StackUtils.isStackDataEqual(stack, is)) {
                is.stackSize += stack.stackSize;
                int left = Math.max(0, is.stackSize - is.getMaxStackSize());
                stack.stackSize = left;
                is.stackSize -= left;
            }
        }
        if(stack.stackSize > 0) {
            int id = inv.getFirstEmptyStack();
            if(id == -1) {
                return stack.stackSize;
            }
            inv.setInventorySlotContents(id, stack.copy());
            return 0;
        }
        return 0;
    }
    
    /**
     * Try to find the index of a item in player's inventory. if fail, return -1.
     */
    public static int getSlotByStack(ItemStack item, EntityPlayer player) {
        InventoryPlayer inv = player.inventory;
        for(int i = 0; i < inv.mainInventory.length; i++) {
            ItemStack is = inv.mainInventory[i];
            if(is != null && item == is)
                return i;
        }
        return -1;
    }

    
}