添加村民交易物品映射

core/src/main/java/net/momirealms/craftengine/core/item/trade/MerchantOffer.java

@@ -0,0 +1,87 @@
+package net.momirealms.craftengine.core.item.trade;
+
+import net.momirealms.craftengine.core.item.Item;
+
+import java.util.Optional;
+import java.util.function.Function;
+
+public class MerchantOffer<I> {
+    private Item<I> cost1;
+    private Optional<Item<I>> cost2;
+    private Item<I> result;
+    private final int uses;
+    private final int maxUses;
+    private final int specialPrice;
+    private final int xp;
+    private final float priceMultiplier;
+    private final int demand;
+    private final boolean outOfStock;
+
+    public MerchantOffer(Item<I> cost1,
+                         Optional<Item<I>> cost2,
+                         Item<I> result,
+                         boolean outOfStock,
+                         int uses,
+                         int maxUses,
+                         int xp,
+                         int specialPrice,
+                         float priceMultiplier,
+                         int demand) {
+        this.cost1 = cost1;
+        this.cost2 = cost2;
+        this.result = result;
+        this.outOfStock = outOfStock;
+        this.uses = uses;
+        this.maxUses = maxUses;
+        this.specialPrice = specialPrice;
+        this.xp = xp;
+        this.priceMultiplier = priceMultiplier;
+        this.demand = demand;
+    }
+
+    public void applyClientboundData(Function<Item<I>, Item<I>> function) {
+        this.cost1 = function.apply(this.cost1);
+        this.cost2 = this.cost2.map(function);
+        this.result = function.apply(this.result);
+    }
+
+    public Item<I> cost1() {
+        return cost1;
+    }
+
+    public Optional<Item<I>> cost2() {
+        return cost2;
+    }
+
+    public Item<I> result() {
+        return result;
+    }
+
+    public int uses() {
+        return uses;
+    }
+
+    public int maxUses() {
+        return maxUses;
+    }
+
+    public int specialPrice() {
+        return specialPrice;
+    }
+
+    public int xp() {
+        return xp;
+    }
+
+    public float priceMultiplier() {
+        return priceMultiplier;
+    }
+
+    public int demand() {
+        return demand;
+    }
+
+    public boolean outOfStock() {
+        return outOfStock;
+    }
+}