Add BlockPreDispenseEvent (#5075)

Spigot-API-Patches/0263-Add-BlockPreDispenseEvent.patch

@@ -0,0 +1,72 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Matthew Miller <mnmiller1@me.com>
+Date: Sun, 17 Jan 2021 13:15:54 +1000
+Subject: [PATCH] Add BlockPreDispenseEvent
+
+
+diff --git a/src/main/java/io/papermc/paper/event/block/BlockPreDispenseEvent.java b/src/main/java/io/papermc/paper/event/block/BlockPreDispenseEvent.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..07aad3f4ff60a6a6de69634b0d31926e9c00e77b
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/event/block/BlockPreDispenseEvent.java
+@@ -0,0 +1,60 @@
++package io.papermc.paper.event.block;
++
++import org.bukkit.block.Block;
++import org.bukkit.event.Cancellable;
++import org.bukkit.event.HandlerList;
++import org.bukkit.event.block.BlockEvent;
++import org.bukkit.inventory.ItemStack;
++import org.jetbrains.annotations.NotNull;
++
++public class BlockPreDispenseEvent extends BlockEvent implements Cancellable {
++    private static final HandlerList handlers = new HandlerList();
++    private boolean cancelled = false;
++    private final ItemStack itemStack;
++    private final int slot;
++
++    public BlockPreDispenseEvent(@NotNull Block block, @NotNull ItemStack itemStack, int slot) {
++        super(block);
++        this.itemStack = itemStack;
++        this.slot = slot;
++    }
++
++    /**
++     * Gets the {@link ItemStack} to be dispensed.
++     *
++     * @return The item to be dispensed
++     */
++    @NotNull
++    public ItemStack getItemStack() {
++        return itemStack;
++    }
++
++    /**
++     * Gets the inventory slot of the dispenser to dispense from.
++     *
++     * @return The inventory slot
++     */
++    public int getSlot() {
++        return slot;
++    }
++
++    @NotNull
++    public HandlerList getHandlers() {
++        return handlers;
++    }
++
++    @NotNull
++    public static HandlerList getHandlerList() {
++        return handlers;
++    }
++
++    @Override
++    public boolean isCancelled() {
++        return this.cancelled;
++    }
++
++    @Override
++    public void setCancelled(boolean cancel) {
++        this.cancelled = cancel;
++    }
++}

Spigot-Server-Patches/0656-Implement-BlockPreDispenseEvent.patch

@@ -0,0 +1,42 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Matthew Miller <mnmiller1@me.com>
+Date: Sun, 17 Jan 2021 13:16:09 +1000
+Subject: [PATCH] Implement BlockPreDispenseEvent
+
+
+diff --git a/src/main/java/net/minecraft/server/BlockDispenser.java b/src/main/java/net/minecraft/server/BlockDispenser.java
+index 063453552b7b6c2395c8f9be27cdb71a15a56ca4..89325af931b5ca43729758e94e971b612f65eea2 100644
+--- a/src/main/java/net/minecraft/server/BlockDispenser.java
++++ b/src/main/java/net/minecraft/server/BlockDispenser.java
+@@ -55,6 +55,7 @@ public class BlockDispenser extends BlockTileEntity {
+             IDispenseBehavior idispensebehavior = this.a(itemstack);
+ 
+             if (idispensebehavior != IDispenseBehavior.NONE) {
++                if (!org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockPreDispenseEvent(worldserver, blockposition, itemstack, i)) return; // Paper - BlockPreDispenseEvent is called here
+                 eventFired = false; // CraftBukkit - reset event status
+                 tileentitydispenser.setItem(i, idispensebehavior.dispense(sourceblock, itemstack));
+             }
+diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+index 63d329dca12f902e2fb2a62ee4c86aea6453f1a3..696ded96e6018bc5289cc20f72d6dc9395d3b6a6 100644
+--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
++++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+@@ -13,6 +13,7 @@ import java.util.List;
+ import java.util.Map;
+ import java.util.stream.Collectors;
+ import javax.annotation.Nullable;
++import io.papermc.paper.event.block.BlockPreDispenseEvent;
+ import net.minecraft.server.BlockPosition;
+ import net.minecraft.server.BlockPropertyInstrument;
+ import net.minecraft.server.Container;
+@@ -1770,5 +1771,11 @@ public class CraftEventFactory {
+         BlockFailedDispenseEvent event = new BlockFailedDispenseEvent(block);
+         return event.callEvent();
+     }
++
++    public static boolean handleBlockPreDispenseEvent(WorldServer worldserver, BlockPosition blockposition, ItemStack itemStack, int slot) {
++        org.bukkit.block.Block block = worldserver.getWorld().getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ());
++        BlockPreDispenseEvent event = new BlockPreDispenseEvent(block, org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemStack), slot);
++        return event.callEvent();
++    }
+     // Paper end
+ }