Test with stuff + Forestry potential support

BM_src/forestry/api/storage/IBackpackDefinition.java

@@ -0,0 +1,54 @@
+package forestry.api.storage;
+
+import java.util.Collection;
+
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.item.ItemStack;
+
+public interface IBackpackDefinition {
+
+	/**
+	 * @return A unique string identifier
+	 */
+	String getKey();
+
+	/**
+	 * @return Human-readable name of the backpack.
+	 */
+	String getName();
+
+	/**
+	 * @return Primary colour for the backpack icon.
+	 */
+	int getPrimaryColour();
+
+	/**
+	 * @return Secondary colour for backpack icon.
+	 */
+	int getSecondaryColour();
+
+	/**
+	 * Adds an item as valid for this backpack.
+	 * 
+	 * @param validItem
+	 */
+	void addValidItem(ItemStack validItem);
+
+	/**
+	 * Returns an arraylist of all items valid for this backpack type.
+	 * 
+	 * @param player
+	 * @return Collection of itemstack which are valid items for this backpack type. May be empty or null and does not necessarily include all valid items.
+	 */
+	Collection<ItemStack> getValidItems(EntityPlayer player);
+
+	/**
+	 * Returns true if the itemstack is a valid item for this backpack type.
+	 * 
+	 * @param player
+	 * @param itemstack
+	 * @return true if the given itemstack is valid for this backpack, false otherwise.
+	 */
+	boolean isValidItem(EntityPlayer player, ItemStack itemstack);
+
+}