InventoryCopy.java

/* 
 * Copyright (c) CovertJaguar, 2014 http://railcraft.info
 * 
 * This code is the property of CovertJaguar
 * and may only be used with explicit written
 * permission unless otherwise specified on the
 * license page at http://railcraft.info/wiki/info:license.
 */
package mods.railcraft.common.util.inventory.wrappers;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.IInventory;
import net.minecraft.item.ItemStack;

/**
 * Creates a deep copy of an existing IInventory.
 *
 * Useful for performing inventory manipulations and then examining the results
 * without affecting the original inventory.
 *
 * @author CovertJaguar <http://www.railcraft.info>
 */
public class InventoryCopy implements IInventory {

    private IInventory orignal;
    private ItemStack contents[];

    public InventoryCopy(IInventory orignal) {
        this.orignal = orignal;
        contents = new ItemStack[orignal.getSizeInventory()];
        for (int i = 0; i < contents.length; i++) {
            ItemStack stack = orignal.getStackInSlot(i);
            if (stack != null) {
                contents[i] = stack.copy();
            }
        }
    }

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

    @Override
    public ItemStack getStackInSlot(int i) {
        return contents[i];
    }

    @Override
    public ItemStack decrStackSize(int i, int j) {
        if (contents[i] != null) {
            if (contents[i].stackSize <= j) {
                ItemStack itemstack = contents[i];
                contents[i] = null;
                markDirty();
                return itemstack;
            }
            ItemStack itemstack1 = contents[i].splitStack(j);
            if (contents[i].stackSize <= 0) {
                contents[i] = null;
            }
            markDirty();
            return itemstack1;
        } else {
            return null;
        }
    }

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

    @Override
    public String getInventoryName() {
        return orignal.getInventoryName();
    }

    @Override
    public int getInventoryStackLimit() {
        return orignal.getInventoryStackLimit();
    }

    @Override
    public void markDirty() {
    }

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

    @Override
    public void openInventory() {
    }

    @Override
    public void closeInventory() {
    }

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

    @Override
    public boolean hasCustomInventoryName() {
        return orignal.hasCustomInventoryName();
    }

    @Override
    public boolean isItemValidForSlot(int slot, ItemStack stack) {
        return orignal.isItemValidForSlot(slot, stack);
    }
}