TileEntityDispenser.java

package net.minecraft.tileentity;

import java.util.Random;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.IInventory;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.nbt.NBTTagList;

public class TileEntityDispenser extends TileEntity implements IInventory
{
    private ItemStack[] dispenserContents = new ItemStack[9];

    /**
     * random number generator for instance. Used in random item stack selection.
     */
    private Random dispenserRandom = new Random();

    /**
     * Returns the number of slots in the inventory.
     */
    public int getSizeInventory()
    {
        return 9;
    }

    /**
     * Returns the stack in slot i
     */
    public ItemStack getStackInSlot(int par1)
    {
        return this.dispenserContents[par1];
    }

    /**
     * Removes from an inventory slot (first arg) up to a specified number (second arg) of items and returns them in a
     * new stack.
     */
    public ItemStack decrStackSize(int par1, int par2)
    {
        if (this.dispenserContents[par1] != null)
        {
            ItemStack var3;

            if (this.dispenserContents[par1].stackSize <= par2)
            {
                var3 = this.dispenserContents[par1];
                this.dispenserContents[par1] = null;
                this.onInventoryChanged();
                return var3;
            }
            else
            {
                var3 = this.dispenserContents[par1].splitStack(par2);

                if (this.dispenserContents[par1].stackSize == 0)
                {
                    this.dispenserContents[par1] = null;
                }

                this.onInventoryChanged();
                return var3;
            }
        }
        else
        {
            return null;
        }
    }

    /**
     * When some containers are closed they call this on each slot, then drop whatever it returns as an EntityItem -
     * like when you close a workbench GUI.
     */
    public ItemStack getStackInSlotOnClosing(int par1)
    {
        if (this.dispenserContents[par1] != null)
        {
            ItemStack var2 = this.dispenserContents[par1];
            this.dispenserContents[par1] = null;
            return var2;
        }
        else
        {
            return null;
        }
    }

    public int getRandomStackFromInventory()
    {
        int var1 = -1;
        int var2 = 1;

        for (int var3 = 0; var3 < this.dispenserContents.length; ++var3)
        {
            if (this.dispenserContents[var3] != null && this.dispenserRandom.nextInt(var2++) == 0)
            {
                var1 = var3;
            }
        }

        return var1;
    }

    /**
     * Sets the given item stack to the specified slot in the inventory (can be crafting or armor sections).
     */
    public void setInventorySlotContents(int par1, ItemStack par2ItemStack)
    {
        this.dispenserContents[par1] = par2ItemStack;

        if (par2ItemStack != null && par2ItemStack.stackSize > this.getInventoryStackLimit())
        {
            par2ItemStack.stackSize = this.getInventoryStackLimit();
        }

        this.onInventoryChanged();
    }

    /**
     * Add item stack in first available inventory slot
     */
    public int addItem(ItemStack par1ItemStack)
    {
        for (int var2 = 0; var2 < this.dispenserContents.length; ++var2)
        {
            if (this.dispenserContents[var2] == null || this.dispenserContents[var2].itemID == 0)
            {
                this.dispenserContents[var2] = par1ItemStack;
                return var2;
            }
        }

        return -1;
    }

    /**
     * Returns the name of the inventory.
     */
    public String getInvName()
    {
        return "container.dispenser";
    }

    /**
     * Reads a tile entity from NBT.
     */
    public void readFromNBT(NBTTagCompound par1NBTTagCompound)
    {
        super.readFromNBT(par1NBTTagCompound);
        NBTTagList var2 = par1NBTTagCompound.getTagList("Items");
        this.dispenserContents = new ItemStack[this.getSizeInventory()];

        for (int var3 = 0; var3 < var2.tagCount(); ++var3)
        {
            NBTTagCompound var4 = (NBTTagCompound)var2.tagAt(var3);
            int var5 = var4.getByte("Slot") & 255;

            if (var5 >= 0 && var5 < this.dispenserContents.length)
            {
                this.dispenserContents[var5] = ItemStack.loadItemStackFromNBT(var4);
            }
        }
    }

    /**
     * Writes a tile entity to NBT.
     */
    public void writeToNBT(NBTTagCompound par1NBTTagCompound)
    {
        super.writeToNBT(par1NBTTagCompound);
        NBTTagList var2 = new NBTTagList();

        for (int var3 = 0; var3 < this.dispenserContents.length; ++var3)
        {
            if (this.dispenserContents[var3] != null)
            {
                NBTTagCompound var4 = new NBTTagCompound();
                var4.setByte("Slot", (byte)var3);
                this.dispenserContents[var3].writeToNBT(var4);
                var2.appendTag(var4);
            }
        }

        par1NBTTagCompound.setTag("Items", var2);
    }

    /**
     * Returns the maximum stack size for a inventory slot. Seems to always be 64, possibly will be extended. *Isn't
     * this more of a set than a get?*
     */
    public int getInventoryStackLimit()
    {
        return 64;
    }

    /**
     * Do not make give this method the name canInteractWith because it clashes with Container
     */
    public boolean isUseableByPlayer(EntityPlayer par1EntityPlayer)
    {
        return this.worldObj.getBlockTileEntity(this.xCoord, this.yCoord, this.zCoord) != this ? false : par1EntityPlayer.getDistanceSq((double)this.xCoord + 0.5D, (double)this.yCoord + 0.5D, (double)this.zCoord + 0.5D) <= 64.0D;
    }

    public void openChest() {}

    public void closeChest() {}
}