All Superinterfaces:

DataSerializable
```
public interface TradeOffer
extends DataSerializable
```
Represents a trade offer that a Merchant may offer a Humanoid.

TradeOffers usually have a limited amount of times they can be used.

Also, trade offers are not guaranteed to have two buying items.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static interface TradeOffer.Builder
Represents a builder to generate immutable TradeOffers.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`static TradeOffer.Builder`	`builder()`	Creates a new `TradeOffer.Builder` to build a `TradeOffer`.
`int`	`demandBonus()`	Gets the demand bonus for this trade offer.
`boolean`	`doesGrantExperience()`	Gets whether this trade offer will grant experience to the customer upon usage or not.
`int`	`experienceGrantedToMerchant()`	Gets the amount of experience granted to the merchant when this trade offer is used.
`ItemStackSnapshot`	`firstBuyingItem()`	Gets the first buying item.
`boolean`	`hasExpired()`	Checks if this trade offer has indeed passed the time of which the uses surpassed the maximum uses.
`boolean`	`hasSecondItem()`	Returns whether this trade offer has a second item the merchant is buying from the customer.
`int`	`maxUses()`	Gets the current maximum uses of this offer.
`double`	`priceGrowthMultiplier()`	Gets the rate at which this trade offer's price will grow when demand for an item increases.
`java.util.Optional<ItemStackSnapshot>`	`secondBuyingItem()`	Gets the second buying item.
`ItemStackSnapshot`	`sellingItem()`	Gets the selling item the `Merchant` will give to the customer often in exchange for a single item or sometimes, two items from the following methods: `firstBuyingItem()` and `secondBuyingItem()`.
`int`	`uses()`	Gets the current uses of this offer.

Methods inherited from interface org.spongepowered.api.data.persistence.DataSerializable
contentVersion, toContainer

- Method Detail
  - builder
```
static TradeOffer.Builder builder()
```
    Creates a new TradeOffer.Builder to build a TradeOffer.
    
    Returns:
    
    The new builder
  - firstBuyingItem
```
ItemStackSnapshot firstBuyingItem()
```
    Gets the first buying item.
    The first buying item is an item that the customer is selling to the merchant in exchange for sellingItem().
    
    Returns:
    
    The first buying item
  - hasSecondItem
```
boolean hasSecondItem()
```
    Returns whether this trade offer has a second item the merchant is buying from the customer.
    
    Returns:
    
    True if there is a second buying item
  - secondBuyingItem
```
java.util.Optional<ItemStackSnapshot> secondBuyingItem()
```
    Gets the second buying item.
    
    The second buying item is an item that the customer is selling to the merchant, along with the firstBuyingItem(), in exchange for sellingItem().
    
    Returns:
    
    The second buying item, if available
  - sellingItem
```
ItemStackSnapshot sellingItem()
```
    Gets the selling item the Merchant will give to the customer often in exchange for a single item or sometimes, two items from the following methods: firstBuyingItem() and secondBuyingItem().
    
    Returns:
    
    The selling item
  - uses
```
int uses()
```
    Gets the current uses of this offer.
    
    Usually, the uses of an offer are limited by the amount of maxUses(). Once the uses reaches the max uses, the offer may temporarily become disabled.
    
    Returns:
    
    The current uses of this trade offer
  - maxUses
```
int maxUses()
```
    Gets the current maximum uses of this offer.
    
    Usually, the uses of an offer are limited by the amount of maximum uses. Once the uses reaches the max uses, the offer may temporarily become disabled.
    
    Returns:
    
    The maximum uses of this trade offer
  - hasExpired
```
boolean hasExpired()
```
    Checks if this trade offer has indeed passed the time of which the uses surpassed the maximum uses.
    
    Returns:
    
    True if the uses have surpassed the maximum uses
  - doesGrantExperience
```
boolean doesGrantExperience()
```
    Gets whether this trade offer will grant experience to the customer upon usage or not.
    
    Returns:
    
    True if using this trade offer will grant experience to the customer
  - experienceGrantedToMerchant
```
int experienceGrantedToMerchant()
```
    Gets the amount of experience granted to the merchant when this trade offer is used.
    
    Returns:
    
    The experience to be granted to the merchant
  - priceGrowthMultiplier
```
double priceGrowthMultiplier()
```
    Gets the rate at which this trade offer's price will grow when demand for an item increases. Every time a villager trades, this value is multiplied by the current price of the offer and the demand bonus.
    If this value is 0, demand will have no effect on this offer's price.
    
    Returns:
    
    the price growth multiplier
    
    See Also:
    
    the Minecraft Wiki for more detail on how the price growth multiplier applies to trade offers
  - demandBonus
```
int demandBonus()
```
    Gets the demand bonus for this trade offer.
    
    Returns:
    
    the demand bonus

Interface TradeOffer

Nested Class Summary

Method Summary

Methods inherited from interface org.spongepowered.api.data.persistence.DataSerializable

Method Detail

builder

firstBuyingItem

hasSecondItem

secondBuyingItem

sellingItem

uses

maxUses

hasExpired

doesGrantExperience

experienceGrantedToMerchant

priceGrowthMultiplier

demandBonus