StackUtils.java

/**
 * Copyright (c) Lambda Innovation, 2013-2015
 * 本作品版权由Lambda Innovation所有。
 * http://www.li-dev.cn/
 * <p/>
 * 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.item.EntityItem;
import net.minecraft.inventory.IInventory;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.world.World;

import java.util.Random;

public class StackUtils {

    public static void dropItems(World world, int x, int y, int z, IInventory inv) {
        Random rand = new Random();

        for (int i = 0; i < inv.getSizeInventory(); ++i) {
            ItemStack stack = inv.getStackInSlot(i);
            if (stack != null && stack.stackSize > 0) {
                float rx = rand.nextFloat() * 0.8F + 0.1F;
                float ry = rand.nextFloat() * 0.8F + 0.1F;
                float rz = rand.nextFloat() * 0.8F + 0.1F;

                EntityItem entityItem = new EntityItem(world, x + rx, y + ry, z + rz, stack.copy());

                if (stack.hasTagCompound()) {
                    entityItem.getEntityItem().setTagCompound((NBTTagCompound) stack.getTagCompound().copy());
                }

                float factor = 0.05F;
                entityItem.motionX = rand.nextGaussian() * factor;
                entityItem.motionY = rand.nextGaussian() * factor + 0.2F;
                entityItem.motionZ = rand.nextGaussian() * factor;
                world.spawnEntityInWorld(entityItem);
                stack.stackSize = 0;
            }
        }
    }

    /**
     * Return whether two stack's item instance and data are equal.
     */
    public static boolean isStackDataEqual(ItemStack s1, ItemStack s2) {
        if (s1.getItem() != s1.getItem())
            return false;
        NBTTagCompound tag1 = s1.getTagCompound(), tag2 = s2.getTagCompound();
        if (tag1 == null || tag2 == null) {
            return tag1 == null && tag2 == null;
        }

        return tag1.equals(tag2);
    }

    public static NBTTagCompound loadTag(ItemStack stack) {
        NBTTagCompound ret = stack.getTagCompound();
        if (ret == null)
            stack.setTagCompound(new NBTTagCompound());
        ret = stack.getTagCompound();
        return ret;
    }

}