Add Merchant API

By: Xor Boole <mcyoung@mit.edu>

paper-api/src/main/java/org/bukkit/event/entity/VillagerAcquireTradeEvent.java

@@ -0,0 +1,64 @@
+package org.bukkit.event.entity;
+
+import org.bukkit.entity.Villager;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.inventory.MerchantRecipe;
+
+/**
+ * Called whenever a villager acquires a new trade.
+ */
+public class VillagerAcquireTradeEvent extends EntityEvent implements Cancellable {
+
+    private static final HandlerList handlers = new HandlerList();
+    private boolean cancelled;
+    //
+    private MerchantRecipe recipe;
+
+    public VillagerAcquireTradeEvent(Villager what, MerchantRecipe recipe) {
+        super(what);
+        this.recipe = recipe;
+    }
+
+    /**
+     * Get the recipe to be acquired.
+     *
+     * @return the new recipe
+     */
+    public MerchantRecipe getRecipe() {
+        return recipe;
+    }
+
+    /**
+     * Set the recipe to be acquired.
+     *
+     * @param recipe the new recipe
+     */
+    public void setRecipe(MerchantRecipe recipe) {
+        this.recipe = recipe;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    @Override
+    public void setCancelled(boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    @Override
+    public Villager getEntity() {
+        return (Villager) super.getEntity();
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+}

paper-api/src/main/java/org/bukkit/event/entity/VillagerReplenishTradeEvent.java

@@ -0,0 +1,89 @@
+package org.bukkit.event.entity;
+
+import org.bukkit.entity.Villager;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.inventory.MerchantRecipe;
+
+/**
+ * Called when a villager's trade's maximum uses is increased, due to a player's
+ * trade.
+ *
+ * @see MerchantRecipe#getMaxUses()
+ */
+public class VillagerReplenishTradeEvent extends EntityEvent implements Cancellable {
+
+    private static final HandlerList handlers = new HandlerList();
+    private boolean cancelled;
+    //
+    private MerchantRecipe recipe;
+    private int bonus;
+
+    public VillagerReplenishTradeEvent(Villager what, MerchantRecipe recipe, int bonus) {
+        super(what);
+        this.recipe = recipe;
+        this.bonus = bonus;
+    }
+
+    /**
+     * Get the recipe to replenish.
+     *
+     * @return the replenished recipe
+     */
+    public MerchantRecipe getRecipe() {
+        return recipe;
+    }
+
+    /**
+     * Set the recipe to replenish.
+     *
+     * @param recipe the replenished recipe
+     */
+    public void setRecipe(MerchantRecipe recipe) {
+        this.recipe = recipe;
+    }
+
+    /**
+     * Get the bonus uses added. The maximum uses of the recipe will be
+     * increased by this number.
+     *
+     * @return the extra uses added
+     */
+    public int getBonus() {
+        return bonus;
+    }
+
+    /**
+     * Set the bonus uses added.
+     *
+     * @see VillagerReplenishTradeEvent#getBonus()
+     * @param bonus the extra uses added
+     */
+    public void setBonus(int bonus) {
+        this.bonus = bonus;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    @Override
+    public void setCancelled(boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    @Override
+    public Villager getEntity() {
+        return (Villager) super.getEntity();
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+}