StackUtils.java

package cn.liutils.util.mc;

import java.util.Random;

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;

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.stackTagCompound;
        if(ret == null)
            ret = stack.stackTagCompound = new NBTTagCompound();
        return ret;
    }
    
}