feat: rework recipe modification (#6)

Author: FourtySeven047

src/main/java/minevalley/crafting/api/recipe/CustomRecipe.java

@@ -1,7 +1,6 @@
 package minevalley.crafting.api.recipe;
 
 import minevalley.core.api.users.OnlineUser;
-import minevalley.crafting.api.ingredient.RecipeIngredient;
 import org.bukkit.inventory.ItemStack;
 import org.jetbrains.annotations.Contract;
 
@@ -28,16 +27,6 @@ public interface CustomRecipe {
     @Contract(pure = true)
     long getCraftingDurationMs();
 
-    /**
-     * Maps a symbol in the recipe shape to a crafting ingredient.
-     *
-     * @param symbol     the symbol to map
-     * @param ingredient the crafting ingredient to map to the symbol
-     * @return this
-     * @throws IllegalArgumentException if the symbol is already mapped or if the ingredient is null
-     */
-    CustomRecipe mapIngredient(char symbol, @Nonnull RecipeIngredient ingredient) throws IllegalArgumentException;
-
     /**
      * Sets a requirement that must be fulfilled by the user trying to craft this recipe.
      *

src/main/java/minevalley/crafting/api/recipe/CustomShapedRecipe.java

@@ -8,6 +8,16 @@
 @SuppressWarnings("unused")
 public interface CustomShapedRecipe extends CustomRecipe {
 
+    /**
+     * Maps a symbol in the recipe shape to a crafting ingredient.
+     *
+     * @param symbol     the symbol to map
+     * @param ingredient the crafting ingredient to map to the symbol
+     * @return this
+     * @throws IllegalArgumentException if the symbol is already mapped or if the ingredient is null
+     */
+    CustomShapedRecipe mapIngredient(char symbol, @Nonnull RecipeIngredient ingredient) throws IllegalArgumentException;
+
     /**
      * Gets the ingredients arranged in the shape of the recipe.
      *

src/main/java/minevalley/crafting/api/recipe/CustomShapelessRecipe.java

@@ -1,6 +1,18 @@
 package minevalley.crafting.api.recipe;
 
+import minevalley.crafting.api.ingredient.RecipeIngredient;
+
+import javax.annotation.Nonnull;
+
 @SuppressWarnings("unused")
 public interface CustomShapelessRecipe extends CustomRecipe {
 
+    /**
+     * Adds an ingredient to the recipe.
+     *
+     * @param ingredient the ingredient to add
+     * @return this
+     * @throws IllegalArgumentException if the ingredient is null
+     */
+    CustomShapelessRecipe addIngredient(@Nonnull RecipeIngredient ingredient) throws IllegalArgumentException;
 }