Pattern boilerplate

src/main/java/refinedstorage/item/ItemPattern.java

@@ -1,7 +1,53 @@
 package refinedstorage.item;
 
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NBTTagCompound;
+
+import java.util.List;
+
 public class ItemPattern extends ItemBase {
+    public static final String NBT_SLOT = "Slot_%d";
+    public static final String NBT_RESULT = "Result";
+
     public ItemPattern() {
         super("pattern");
     }
+
+    @Override
+    public void addInformation(ItemStack pattern, EntityPlayer player, List list, boolean b) {
+        if (getResult(pattern) != null) {
+            list.add(getResult(pattern).getDisplayName());
+        }
+    }
+
+    public static void setSlot(ItemStack pattern, int i, ItemStack stack) {
+        if (pattern.getTagCompound() == null) {
+            pattern.setTagCompound(new NBTTagCompound());
+        }
+
+        NBTTagCompound stackTag = new NBTTagCompound();
+        stack.writeToNBT(stackTag);
+
+        pattern.getTagCompound().setTag(String.format(NBT_SLOT, i), stackTag);
+    }
+
+    public static void setResult(ItemStack pattern, ItemStack stack) {
+        if (pattern.getTagCompound() == null) {
+            pattern.setTagCompound(new NBTTagCompound());
+        }
+
+        NBTTagCompound stackTag = new NBTTagCompound();
+        stack.writeToNBT(stackTag);
+
+        pattern.getTagCompound().setTag(NBT_RESULT, stackTag);
+    }
+
+    public static ItemStack getResult(ItemStack pattern) {
+        if (pattern.getTagCompound() == null || !pattern.getTagCompound().hasKey(NBT_RESULT)) {
+            return null;
+        }
+
+        return ItemStack.loadItemStackFromNBT(pattern.getTagCompound().getCompoundTag(NBT_RESULT));
+    }
 }