Create ItemFishedEvent, the event is cancelable, but items are not mutable. Use LootTables to control that. (#3705)

src/main/java/net/minecraftforge/event/entity/player/ItemFishedEvent.java

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+/*
+ * Minecraft Forge
+ * Copyright (c) 2016.
+ *
+ * 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.entity.player;
+
+import com.google.common.base.Preconditions;
+import net.minecraft.entity.projectile.EntityFishHook;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.NonNullList;
+import net.minecraftforge.fml.common.eventhandler.Cancelable;
+
+import javax.annotation.Nonnegative;
+import java.util.List;
+
+/**
+ * This event is called when a player fishes an item.
+ *
+ * This event is {@link net.minecraftforge.fml.common.eventhandler.Cancelable}
+ * Canceling the event will cause the player to receive no items at all.
+ * The hook will still take the damage specified
+ */
+@Cancelable
+public class ItemFishedEvent extends PlayerEvent
+{
+    private final NonNullList<ItemStack> stacks = NonNullList.create();
+    private final EntityFishHook hook;
+    private int rodDamage;
+
+    public ItemFishedEvent(List<ItemStack> stacks, int rodDamage, EntityFishHook hook)
+    {
+        super(hook.getAngler());
+        this.stacks.addAll(stacks);
+        this.rodDamage = rodDamage;
+        this.hook = hook;
+    }
+
+    /**
+     * Get the damage the rod will take.
+     * @return The damage the rod will take
+     */
+    public int getRodDamage()
+    {
+        return rodDamage;
+    }
+
+    /**
+     * Specifies the amount of damage that the fishing rod should take.
+     * This is not added to the pre-existing damage to be taken.
+     * @param rodDamage The damage the rod will take. Must be nonnegative
+     */
+    public void damageRodBy(@Nonnegative int rodDamage)
+    {
+        Preconditions.checkArgument(rodDamage >= 0);
+        this.rodDamage = rodDamage;
+    }
+
+    /**
+     * Use this to get the items the player will receive.
+     * You cannot use this to modify the drops the player will get.
+     * If you want to affect the loot, you should use LootTables.
+     */
+    public NonNullList<ItemStack> getDrops()
+    {
+        return stacks;
+    }
+
+    /**
+     * Use this to stuff related to the hook itself, like the position of the bobber.
+     */
+    public EntityFishHook getHookEntity()
+    {
+        return hook;
+    }
+}