Method register

paper-api/src/main/java/org/bukkit/StructureType.java:235–241

(@NotNull T type)

    }

    @NotNull
    private static <T extends StructureType> T register(@NotNull T type) {
        Preconditions.checkNotNull(type, "Cannot register null StructureType.");
        Preconditions.checkArgument(!structureTypeMap.containsKey(type.getName()), "Cannot register same StructureType twice. %s", type.getName());
        StructureType.structureTypeMap.put(type.getName(), type);
        return type;
    }

    /**
     * Get all registered {@link StructureType}s.