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Finish tag providers
Tags can be generated for a mod by subclassing <code>TagsProvider</code> and implementing <code>#addTags</code>. After implementation, the provider must be added to the <code>DataGenerator</code>.
= TagsProvider =
The tags provider typically generates tags via <code>#tag</code>.
{{Colored box|title=Information|content=You can still use <code>TagsProvider</code> for Items and Blocks but you would need to implement a lot of stuff that is already done in <code>ItemTagsProvider</code> and <code>BlockTagsProvider</code>}}
{{Tip|There is another method called <code>#getOrCreateRawBuilder</code>, but this is typically used only in cases when two registries represent the same object but in different forms (block and items).}}
When <code>#tag</code> is called, a builder is created to which the following methods can be chained:
{| class="wikitable sortable"
! Method !! Description
|-
tag(copperTag).add(Init.COPPER_ORE_ITEM.get());
| <code>#add</code> || Adds an object to a tag.
</syntaxhighlight>
|-
| <code>#addOptional</code> || Adds an object to a tag through its name. If the object is not present, then the object will be skipped when loading.
|-
| <code>#addTag</code> || Adds a tag to a tag. All elements within the inner tag are now a part of the outer tag.
|-
| <code>#addOptionalTag</code> || Adds a tag to a tag through its name. If the tag is not present, then the tag will be skipped when loading.
|-
| <code>#replace</code> || When <code>true</code>, all previously loaded entries added to this tag from other datapacks will be discarded. If a datapack is loaded after this one, then it will still append the entries to the tag.
|-
| <code>#remove</code> || Removes an object or all objects within a tag from a tag. If the object is not present in the tag, nothing happens.
|}
{{Tabs/Code Snippets|
java=// In some TagProvider#addTags
this.tag(EXAMPLE_TAG)
.add(EXAMPLE_OBJECT) // Adds an object to the tag
.addOptional(new ResourceLocation("othermod", "other_object")); // Adds an object from another mod to the tag
this.tag(EXAMPLE_TAG_2)
.addTag(EXAMPLE_TAG) // Adds a tag to the tag
.remove(EXAMPLE_OBJECT); // Removes an object from this tag
}}
{{Tip/Important|If the mod's tags softly depends on another mod's tags (the other mod may or may not be present at runtime), the other mods' tags should be referenced using the optional methods.}}
== Using Existing Tag Providers ==
Vanilla contains a few tag providers for certain registries that can be subclassed for ease of implementation.
{| class="wikitable sortable"
! Registry Object Type !! Tag Provider
|-
| <code>Block</code> || <code>BlockTagsProvider</code>
|-
| <code>Item</code> || <code>ItemTagsProvider</code>
|-
| <code>EntityType</code> || <code>EntityTypeTagsProvider</code>
|-
| <code>Fluid</code> || <code>FluidTagsProvider</code>
|-
| <code>GameEvent</code> || <code>GameEventTagsProvider</code>
|-
| <code>Biome</code> || <code>BiomeTagsProvider</code>
|-
| <code>FlatLevelGeneratorPreset</code> || <code>FlatLevelGeneratorPresetTagsProvider</code>
|-
| <code>WorldPreset</code> || <code>WorldPresetTagsProvider</code>
|-
| <code>Structure</code> || <code>StructureTagsProvider</code>
|-
| <code>PoiType</code> || <code>PoiTypeTagsProvider</code>
|-
| <code>BannerPattern</code> || <code>BannerPatternTagsProvider</code>
|-
| <code>CatVariant</code> || <code>CatVariantTagsProvider</code>
|-
| <code>PaintingVariant</code> || <code>PaintingVariantTagsProvider</code>
|-
| <code>Instrument</code> || <code>InstrumentTagsProvider</code>
|}
{{Tabs/Code Snippets|
java=public class ExampleBlockTagsProvider extends BlockTagsProvider {
public ExampleBlockTagsProvider(DataGenerator gen, String modId, ExistingFileHelper efh) {
// ...
}
@Override
public void addTags() {
// Add block tags here
}
}
}}
=== ItemTagsProvider#copy ===
Blocks have item representations such that they can be obtained within an inventory. As such, a number of block tags can also be applied to a similar item tag. To easily generate an item tag with the same entries as a block tag, the <code>#copy</code> method can be used.
{{Tabs/Code Snippets|
java=// In #addTags within a ItemTagsProvider subclass
this.copy(EXAMPLE_BLOCK_TAG, EXAMPLE_ITEM_TAG);
}}
== Custom Tag Providers ==
A custom tag provider can be created via a <code>TagsProvider</code> subclass which takes in the <code>Registry</code> to generate tags for.
{{Tabs/Code Snippets|
java=public RecipeTypeTagsProvider(DataGenerator gen, String modId, ExistingFileHelper efh) {
super(gen, Registry.RECIPE_TYPE, modId, efh);
}
}}
=== Forge Registry Tag Providers ===
If a registry is wrapped by Forge or created by a mod, a provider can be created via a <code>ForgeRegistryTagsProvider</code> subclass instead:
{{Tabs/Code Snippets|
java=public AttributeTagsProvider(DataGenerator gen, String modId, ExistingFileHelper efh) {
super(gen, ForgeRegistries.ATTRIBUTES, modId, efh);
}
}}
[[Category:Data Generation]]
[[Category:Data Generation]]