Blueprints and total elements

It just so happens that the next update will provide a proper Item API in general This means it will distinguish between different item types (unlike the old API, which used different "Attribute" types for an item - that term was a bit confusing). So with the next update, it would look like this:

//Get equipped item
Item item = player.getEquippedItem();

//Check if item is a construction element
if (item instanceof Item.ConstructionItem construction) {
    System.out.println(construction.getConstructionName());  // <- prints "block", for example
}

//Else check if item is an object
else if (item instanceof Item.ObjectItem object){
    System.out.println(object.getObjectName());  // <- prints "workbench", for example
}

//Else check if item is a garment
else if (item instanceof Item.ClothingItem clothing){
    System.out.println(clothing.getClothingName());  // <- prints "mininghelmet", for example
}

//Else check if item is a blueprint
else if (item instanceof Item.BlueprintItem blueprint){
    System.out.println(blueprint.getBlueprintName());  // <- prints "My summer house", for example
}

These item subclasses will also provide specific access (e.g. to get the definition file etc). In case of blueprint items, you will be able to access various information about the blueprint (like number of construction elements it contains, creator name etc)

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However, if you're working with the PlayerPlaceBlueprintEvent, you can already check the amount of elements the blueprint contains: It provides the methods "getConstructionCount()" (to get the number of construction elements in the blueprint), "getObjectCount()" (to get the number of objects like furniture) and "getPlantCount()" (the number of vegetation). If these values exceed your threshold, you can cancel the event