add meta object to storage items

src/main/java/storagecraft/util/InventoryUtil.java

@@ -0,0 +1,91 @@
+package storagecraft.util;
+
+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.nbt.NBTTagList;
+import net.minecraft.world.World;
+import net.minecraftforge.common.util.Constants;
+
+public class InventoryUtil {
+	public static void saveInventory(IInventory inventory, NBTTagCompound nbt) {
+		NBTTagList tagList = new NBTTagList();
+
+		for (int i = 0; i < inventory.getSizeInventory(); i++) {
+			if (inventory.getStackInSlot(i) != null) {
+				NBTTagCompound compoundTag = new NBTTagCompound();
+
+				compoundTag.setInteger("Slot", i);
+
+				inventory.getStackInSlot(i).writeToNBT(compoundTag);
+
+				tagList.appendTag(compoundTag);
+			}
+		}
+
+		nbt.setTag("Inventory", tagList);
+	}
+
+	public static void restoreInventory(IInventory inventory, NBTTagCompound nbt) {
+		if (nbt.hasKey("Inventory")) {
+			NBTTagList tagList = nbt.getTagList("Inventory", Constants.NBT.TAG_COMPOUND);
+
+			for (int i = 0; i < tagList.tagCount(); i++) {
+				int slot = tagList.getCompoundTagAt(i).getInteger("Slot");
+
+				ItemStack stack = ItemStack.loadItemStackFromNBT(tagList.getCompoundTagAt(i));
+
+				inventory.setInventorySlotContents(slot, stack);
+			}
+		}
+	}
+
+	// https://github.com/cpw/ironchest/blob/master/src/main/java/cpw/mods/ironchest/BlockIronChest.java#L200
+	public static void dropInventory(World world, IInventory inventory, int x, int y, int z, int newSize) {
+		Random random = world.rand;
+
+		for (int i = newSize; i < inventory.getSizeInventory(); ++i) {
+			ItemStack stack = inventory.getStackInSlot(i);
+
+			if (stack == null) {
+				continue;
+			}
+
+			float xo = random.nextFloat() * 0.8F + 0.1F;
+			float yo = random.nextFloat() * 0.8F + 0.1F;
+			float zo = random.nextFloat() * 0.8F + 0.1F;
+
+			while (stack.stackSize > 0) {
+				int amount = random.nextInt(21) + 10;
+
+				if (amount > stack.stackSize) {
+					amount = stack.stackSize;
+				}
+
+				stack.stackSize -= amount;
+
+				EntityItem entity = new EntityItem(world, (float) x + xo, (float) y + (newSize > 0 ? 1 : 0) + yo, (float) z + zo, new ItemStack(stack.getItem(), amount, stack.getItemDamage()));
+
+				entity.motionX = (float) random.nextGaussian() * 0.05F;
+				entity.motionY = (float) random.nextGaussian() * 0.05F + 0.2F;
+				entity.motionZ = (float) random.nextGaussian() * 0.05F;
+
+				if (stack.hasTagCompound()) {
+					entity.getEntityItem().setTagCompound((NBTTagCompound) stack.getTagCompound().copy());
+				}
+
+				world.spawnEntityInWorld(entity);
+			}
+		}
+	}
+
+	public static boolean equalsIgnoreQuantity(ItemStack first, ItemStack second) {
+		if (first.stackTagCompound != null && !first.stackTagCompound.equals(second.stackTagCompound)) {
+			return false;
+		}
+
+		return first.getItem() == second.getItem() && first.getItemDamage() == second.getItemDamage();
+	}
+}