Add a few events pertaining to villages (#5302)

src/main/java/net/minecraftforge/event/ForgeEventFactory.java

@@ -35,6 +35,7 @@ import net.minecraft.entity.Entity;
 import net.minecraft.entity.EntityLiving;
 import net.minecraft.entity.EntityLivingBase;
 import net.minecraft.entity.EnumCreatureType;
+import net.minecraft.entity.IMerchant;
 import net.minecraft.entity.effect.EntityLightningBolt;
 import net.minecraft.entity.item.EntityItem;
 import net.minecraft.entity.monster.EntityZombie;
@@ -62,6 +63,8 @@ import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.RayTraceResult;
 import net.minecraft.util.text.ChatType;
 import net.minecraft.util.text.ITextComponent;
+import net.minecraft.village.MerchantRecipeList;
+import net.minecraft.village.Village;
 import net.minecraft.world.Explosion;
 import net.minecraft.world.IWorld;
 import net.minecraft.world.World;
@@ -118,6 +121,7 @@ import net.minecraftforge.event.entity.player.SleepingTimeCheckEvent;
 import net.minecraftforge.event.entity.player.UseHoeEvent;
 import net.minecraftforge.event.furnace.FurnaceFuelBurnTimeEvent;
 import net.minecraftforge.event.terraingen.ChunkGeneratorEvent;
+import net.minecraftforge.event.village.MerchantTradeOffersEvent;
 import net.minecraftforge.event.world.BlockEvent;
 import net.minecraftforge.event.world.BlockEvent.CreateFluidSourceEvent;
 import net.minecraftforge.event.world.BlockEvent.EntityMultiPlaceEvent;
@@ -695,4 +699,17 @@ public class ForgeEventFactory
         MinecraftForge.EVENT_BUS.post(event);
         return event.getResult() != Result.DENY;
     }
+    
+    public static MerchantRecipeList listTradeOffers(IMerchant merchant, EntityPlayer player, @Nullable MerchantRecipeList list)
+    {
+        MerchantRecipeList dupeList = null;
+        if (list != null)
+        {
+            dupeList = new MerchantRecipeList();
+            dupeList.addAll(list);
+        }
+        MerchantTradeOffersEvent event = new MerchantTradeOffersEvent(merchant, player, dupeList);
+        MinecraftForge.EVENT_BUS.post(event);
+        return event.getList();
+    }
 }

src/main/java/net/minecraftforge/event/village/MerchantTradeOffersEvent.java

@@ -0,0 +1,80 @@
+/*
+ * Minecraft Forge
+ * Copyright (c) 2016-2018.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1
+ * of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+package net.minecraftforge.event.village;
+
+import javax.annotation.Nullable;
+
+import net.minecraft.entity.IMerchant;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.village.MerchantRecipeList;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.eventbus.api.Cancelable;
+import net.minecraftforge.eventbus.api.Event;
+
+/**
+ * MerchantTradeOffersEvent is fired when a list of villager trade offers is presented in
+ * {@link IMerchant#getRecipes(EntityPlayer)}, allowing mods to modify trade offers depending
+ * on the player. Be warned that this event is fired on both server and client; thus, modders
+ * should ensure that they sync the needed data for this event themselves.<br>
+ * <br>
+ * This event is not {@link Cancelable}.<br>
+ * <br>
+ * This event does not have a result. {@link HasResult}<br>
+ * <br>
+ * This event is fired on the {@link MinecraftForge#EVENT_BUS}.
+ */
+public class MerchantTradeOffersEvent extends Event
+{
+    private final IMerchant merchant;
+    private final EntityPlayer player;
+    private @Nullable MerchantRecipeList list;
+    
+    public MerchantTradeOffersEvent(IMerchant merchant, EntityPlayer player, @Nullable MerchantRecipeList list)
+    {
+        this.merchant = merchant;
+        this.player = player;
+        this.list = list;
+    }
+
+    /**
+     * The recipe list (if not {@code null}) returned from this function may be modified.
+     * @return the recipe list
+     */
+    public @Nullable MerchantRecipeList getList()
+    {
+        return list;
+    }
+
+    public void setList(@Nullable MerchantRecipeList list)
+    {
+        this.list = list;
+    }
+
+    public IMerchant getMerchant()
+    {
+        return merchant;
+    }
+
+    public EntityPlayer getPlayer()
+    {
+        return player;
+    }
+
+}

src/main/java/net/minecraftforge/event/village/VillageSiegeEvent.java

@@ -0,0 +1,83 @@
+/*
+ * Minecraft Forge
+ * Copyright (c) 2016-2018.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1
+ * of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+package net.minecraftforge.event.village;
+
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.util.math.Vec3d;
+import net.minecraft.village.Village;
+import net.minecraft.village.VillageSiege;
+import net.minecraft.world.World;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.eventbus.api.Cancelable;
+import net.minecraftforge.eventbus.api.Event;
+
+/**
+ * VillageSiegeEvent is fired just before a zombie siege finds a successful location in
+ * {@link VillageSiege#trySetupSiege}, to give mods the chance to stop the siege.<br>
+ * <br>
+ * This event is {@link Cancelable}; canceling stops the siege.<br>
+ * <br>
+ * This event does not have a result. {@link HasResult}<br>
+ * <br>
+ * This event is fired on the {@link MinecraftForge#EVENT_BUS}.
+ */
+@Cancelable
+public class VillageSiegeEvent extends Event
+{
+    private final VillageSiege siege;
+    private final World world;
+    private final EntityPlayer player;
+    private final Village village;
+    private final Vec3d attemptedSpawnPos;
+
+    public VillageSiegeEvent(VillageSiege siege, World world, EntityPlayer player, Village village, Vec3d attemptedSpawnPos)
+    {
+       this.siege = siege;
+       this.world = world;
+       this.player = player;
+       this.village = village;
+       this.attemptedSpawnPos = attemptedSpawnPos;
+    }
+
+    public VillageSiege getSiege()
+    {
+        return siege;
+    }
+
+    public World getWorld()
+    {
+        return world;
+    }
+
+    public EntityPlayer getPlayer()
+    {
+        return player;
+    }
+
+    public Village getVillage()
+    {
+        return village;
+    }
+
+    public Vec3d getAttemptedSpawnPos()
+    {
+        return attemptedSpawnPos;
+    }
+}