Datageneration/Recipes
Recipes can be generated by creating an extension of Minecraft's RecipeProvider class. From there, recipes can be registered by overriding RecipeProvider#registerRecipes.
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super call within the method. Otherwise, you will generate all recipes from Minecraft as well.Recipe Builders
All recipes need to be formatted as an IFinishedRecipe. Each vanilla recipe has a static constructor builder that can be used to create a finished recipe. These can be built by passing the required parameters and then calling #build.
important
#build(Consumer<IFinishedRecipe>, ResourceLocation) instead. This will allow you to specify a different name for the recipe such that it will not override the other.There are six vanilla recipe builders: ShapedRecipeBuilder for shaped recipes, ShapelessRecipeBuilder for shapeless recipes, CookingRecipeBuilder for furnace type recipes, CustomRecipeBuilder for nondeterministic logic, SingleItemRecipeBuilder for stonecutting recipes, and SmithingRecipeBuilder for smithing recipes.
For any recipe to be valid, a criterion must be met to obtain the recipe within the recipe book. This can be attached via #addCriterion. The RecipeProvider class has some basic criteria creators to check whether a player's inventory has a certain item or whether a player has entered into a specific block.
ConditionalRecipe
To specify if a recipe should be loaded at runtime, a ConditionalRecipe can be used in conjunction with a recipe builder. Conditions must be added before the recipe via ConditionalRecipe$Builder#addCondition. Then, once a recipe is added, all previous conditions are cleared for the next to be added. There are a few helper methods for conditions that can be implemented via IConditionBuilder.