KnapsackInventory.java

package tconstruct.armor.player;

import cpw.mods.fml.common.network.ByteBufUtils;
import io.netty.buffer.ByteBuf;
import java.io.IOException;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import net.minecraft.entity.Entity;
import net.minecraft.entity.item.EntityItem;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.IInventory;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.*;

public class KnapsackInventory implements IInventory
{
    public ItemStack[] inventory = new ItemStack[27];
    public WeakReference<EntityPlayer> parent;

    public void init (EntityPlayer player)
    {
        parent = new WeakReference<EntityPlayer>(player);
    }

    @Override
    public ItemStack getStackInSlot (int slot)
    {
        return inventory[slot];
    }

    public boolean isStackInSlot (int slot)
    {
        return inventory[slot] != null;
    }

    @Override
    public int getSizeInventory ()
    {
        return inventory.length;
    }

    @Override
    public int getInventoryStackLimit ()
    {
        return 64;
    }

    public boolean canDropInventorySlot (int slot)
    {
        return true;
    }

    @Override
    public void setInventorySlotContents (int slot, ItemStack itemstack)
    {
        inventory[slot] = itemstack;
        if (itemstack != null && itemstack.stackSize > getInventoryStackLimit())
        {
            itemstack.stackSize = getInventoryStackLimit();
        }
    }

    @Override
    public ItemStack decrStackSize (int slot, int quantity)
    {
        if (inventory[slot] != null)
        {
            if (inventory[slot].stackSize <= quantity)
            {
                ItemStack stack = inventory[slot];
                inventory[slot] = null;
                return stack;
            }
            ItemStack split = inventory[slot].splitStack(quantity);
            if (inventory[slot].stackSize == 0)
            {
                inventory[slot] = null;
            }
            return split;
        }
        else
        {
            return null;
        }
    }

    @Override
    public String getInventoryName ()
    {
        return "tconstruct.knapsack";
    }

    @Override
    public boolean hasCustomInventoryName ()
    {
        return false;
    }

    @Override
    public ItemStack getStackInSlotOnClosing (int slot)
    {
        return null;
    }

    public void openChest ()
    {
    }

    public void closeChest ()
    {
    }

    @Override
    public boolean isItemValidForSlot (int i, ItemStack itemstack)
    {
        return true;
    }

    @Override
    public boolean isUseableByPlayer (EntityPlayer entityplayer)
    {
        return true;
    }

    /* Save/Load */
    public void saveToNBT (NBTTagCompound tagCompound)
    {
        NBTTagList tagList = new NBTTagList();
        NBTTagCompound invSlot;

        for (int i = 0; i < this.inventory.length; ++i)
        {
            if (this.inventory[i] != null)
            {
                invSlot = new NBTTagCompound();
                invSlot.setByte("Slot", (byte) i);
                this.inventory[i].writeToNBT(invSlot);
                tagList.appendTag(invSlot);
            }
        }

        tagCompound.setTag("Knapsack", tagList);
    }

    public void readFromNBT (NBTTagCompound tagCompound)
    {
        NBTTagList tagList = tagCompound.getTagList("Knapsack", 10);
        for (int i = 0; i < tagList.tagCount(); ++i)
        {
            NBTTagCompound nbttagcompound = (NBTTagCompound) tagList.getCompoundTagAt(i);
            int j = nbttagcompound.getByte("Slot") & 255;
            ItemStack itemstack = ItemStack.loadItemStackFromNBT(nbttagcompound);

            if (itemstack != null)
            {
                this.inventory[j] = itemstack;
            }
        }
    }

    public void dropItems (ArrayList<EntityItem> drops)
    {
        EntityPlayer player = parent.get();
        for (int i = 0; i < inventory.length; ++i)
        {
            if (this.inventory[i] != null)
            {
                EntityItem entityItem = player.func_146097_a(this.inventory[i], true, false);
                drops.add(entityItem);
                this.inventory[i] = null;
            }
        }
    }

    public void unequipItems ()
    {
        EntityPlayer player = parent.get();
        for (int i = 0; i < inventory.length; ++i)
        {
            if (this.inventory[i] != null)
            {
                dropItemEntity(player, inventory[i]);
                this.inventory[i] = null;
            }
        }
    }

    void dropItemEntity (Entity dropper, ItemStack dropStack)
    {
        EntityItem entityitem = new EntityItem(dropper.worldObj, dropper.posX, dropper.posY, dropper.posZ, dropStack);
        dropper.worldObj.spawnEntityInWorld(entityitem);
    }

    @Override
    public void markDirty ()
    {
    }

    @Override
    public void openInventory ()
    {
    }

    @Override
    public void closeInventory ()
    {
    }

    public void writeInventoryToStream (ByteBuf os) throws IOException
    {
        for (int i = 0; i < 27; i++)
            ByteBufUtils.writeItemStack(os, inventory[i]);
    }

    public void readInventoryFromStream (ByteBuf is) throws IOException
    {
        for (int i = 0; i < 27; i++)
            inventory[i] = ByteBufUtils.readItemStack(is);
    }

}