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Dynamic Loot Modification (view source)
Revision as of 17:52, 20 September 2022
, 17:52, 20 September 2022Update to 1.19 Codec GLMs
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private static class WheatSeedsConverterModifier extends LootModifier {+ private final int numSeedsToConvert;+ private final Item itemToCheck;+ private final Item itemReward;+ public WheatSeedsConverterModifier(LootItemCondition[] conditions, int numSeeds, Item itemCheck, Item reward) {
− super(conditions);
− numSeedsToConvert = numSeeds;
− itemToCheck = itemCheck;
− itemReward = reward;
− }
−
− @Nonnull
− @Override
− public List<ItemStack> doApply(List<ItemStack> generatedLoot, LootContext context) {
− /*
− int numSeeds = 0;+ for(ItemStack stack : generatedLoot) {+ if(stack.getItem() == itemToCheck)+ numSeeds += stack.getCount();+ }+ if(numSeeds >= numSeedsToConvert) {+ generatedLoot.removeIf(x -> x.getItem() == itemToCheck);+ generatedLoot.add(new ItemStack(itemReward, (numSeeds/numSeedsToConvert)));+ numSeeds = numSeeds % numSeedsToConvert;+ if(numSeeds > 0)+ generatedLoot.add(new ItemStack(itemToCheck, numSeeds));
− }
− return generatedLoot;
− }
− private static class Serializer extends GlobalLootModifierSerializer<WheatSeedsConverterModifier> {+ @Override+ public WheatSeedsConverterModifier read(ResourceLocation name, JsonObject object, LootItemCondition[] conditions) {+ int numSeeds = GsonHelper.getAsInt(object, "numSeeds");+ Item seed = ForgeRegistries.ITEMS.getValue(new ResourceLocation((GsonHelper.getAsString(object, "seedItem"))));+ Item wheat = ForgeRegistries.ITEMS.getValue(new ResourceLocation(GsonHelper.getAsString(object, "replacement")));+ return new WheatSeedsConverterModifier(conditions, numSeeds, seed, wheat);+ }+ @Override+ public JsonObject write(WheatSeedsConverterModifier instance) {+ JsonObject json = makeConditions(instance.conditions);+ json.addProperty("numSeeds", instance.numSeedsToConvert);+ json.addProperty("seedItem", ForgeRegistries.ITEMS.getKey(instance.itemToCheck).toString());
− json.addProperty("replacement", ForgeRegistries.ITEMS.getKey(instance.itemReward).toString());
− return json;
}
−}
Also take note of the <code>read</code> method in the serializer. The conditions are already deserialized for you and if you have no other data, simply <code>return new MyModifier(conditions)</code>. However, the full <code>JsonObject</code> is available if needed. The <code>write</code> method, on the other hand, is used for if you want to utilize <code>GlobalLootModifierProvider</code> for [[datageneration|data generation]].+
#* The operational code that makes your modifier work and associated serializer.
#* The operational code that makes your modifier work and associated serializer.
−Finally, the serializer for your operational class is [[Registration|registered]] as any other <code>ForgeRegistryEntry</code>.
+Finally, the serializer for your operational class is [[Registration|registered]] as any other registry object.
==The global_loot_modifiers.json==
==The global_loot_modifiers.json==
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<syntaxhighlight lang="java">
<syntaxhighlight lang="java">
−/**
− * When harvesting wheat with shears, this modifier is invoked via the wheat_harvest loot_modifier json<br/>
− * This modifier checks how many seeds were harvested and turns X seeds into Y wheat (3:1)
− *
− * Additional conditions can be checked, though as much as possible should be parameterized via JSON data.
− * It is better to write a new LootItemCondition implementation than to do things here.
*/
*/
−private static class WheatSeedsConverterModifier extends LootModifier
−{
− public static final Supplier<Codec<WheatSeedsConverterModifier>> CODEC = Suppliers.memoize(() ->
− RecordCodecBuilder.create(inst -> codecStart(inst).and(
− inst.group(
− Codec.INT.fieldOf("numSeeds").forGetter(m -> m.numSeedsToConvert),
− ForgeRegistries.ITEMS.getCodec().fieldOf("seedItem").forGetter(m -> m.itemToCheck),
− ForgeRegistries.ITEMS.getCodec().fieldOf("replacement").forGetter(m -> m.itemReward)
− )).apply(inst, WheatSeedsConverterModifier::new)
− ));
− private final int numSeedsToConvert;
+ private final Item itemToCheck;
+ private final Item itemReward;
+ public WheatSeedsConverterModifier(LootItemCondition[] conditionsIn, int numSeeds, Item itemCheck,
+ Item reward)
+ {
+ super(conditionsIn);
+ numSeedsToConvert = numSeeds;
+ itemToCheck = itemCheck;
+ itemReward = reward;
+ }
− @NotNull
− @Override
− public ObjectArrayList<ItemStack> doApply(ObjectArrayList<ItemStack> generatedLoot, LootContext context) {
− //
− // Additional conditions can be checked, though as much as possible should be parameterized via JSON data.
− // It is better to write a new ILootCondition implementation than to do things here.
− //
+ int numSeeds = 0;
+ generatedLoot.stream().filter(stack -> stack.getItem() == itemToCheck)
+ .forEach(stack -> numSeeds+=stack.getCount())
+ if(numSeeds >= numSeedsToConvert) {
+ generatedLoot.removeIf(x -> x.getItem() == itemToCheck);
+ generatedLoot.add(new ItemStack(itemReward, (numSeeds/numSeedsToConvert)));
+ numSeeds = numSeeds%numSeedsToConvert;
+ if(numSeeds > 0)
+ generatedLoot.add(new ItemStack(itemToCheck, numSeeds));
+ }
+ return generatedLoot;
+ }
− @Override
− public Codec<? extends IGlobalLootModifier> codec() {
− return CODEC.get();
− }
− }
}
−</syntaxhighlight>
</syntaxhighlight>
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This method is only called if the <code>conditions</code> specified return <code>true</code> and the modder is now able to make the modifications they desire. In this case we can see that the number of <code>itemToCheck</code> meets or exceeds the <code>numSeedsToConvert</code> before modifying the list by adding an <code>itemReward</code> and removing any excess <code>itemToCheck</code> stacks, matching the previously mentioned effects: ''When a wheat block is harvested with shears, if enough seeds are generated as loot, they are converted to additional wheat instead''.
This method is only called if the <code>conditions</code> specified return <code>true</code> and the modder is now able to make the modifications they desire. In this case we can see that the number of <code>itemToCheck</code> meets or exceeds the <code>numSeedsToConvert</code> before modifying the list by adding an <code>itemReward</code> and removing any excess <code>itemToCheck</code> stacks, matching the previously mentioned effects: ''When a wheat block is harvested with shears, if enough seeds are generated as loot, they are converted to additional wheat instead''.
−Utilize <code>GlobalLootModifierProvider</code> for [[datageneration|data generation]].
Additional [https://github.com/MinecraftForge/MinecraftForge/blob/1.19.x/src/test/java/net/minecraftforge/debug/gameplay/loot/GlobalLootModifiersTest.java examples] can be found on the Forge Git repository, including silk touch and smelting effects.
Additional [https://github.com/MinecraftForge/MinecraftForge/blob/1.19.x/src/test/java/net/minecraftforge/debug/gameplay/loot/GlobalLootModifiersTest.java examples] can be found on the Forge Git repository, including silk touch and smelting effects.