feat: Add -Post events firing after operational plot events (#3334)

* Create Post* events

* Address license violations

* address review

* standardize post event calls in EventDispatcher

* Add package-info.java

* Add @since-tag to Post* events

* fix licenser issue

Co-authored-by: Alex <mc.cache@web.de>

Core/src/main/java/com/plotsquared/core/PlotSquared.java

@@ -758,6 +758,9 @@ public class PlotSquared {
             if (this_max < last_max) {
                 plot.getArea().setMeta("lastPlot", plot.getId());
             }
+            if (callEvent) {
+                eventDispatcher.callPostDelete(plot);
+            }
             return true;
         }
         return false;

Core/src/main/java/com/plotsquared/core/command/Auto.java

@@ -344,6 +344,7 @@ public class Auto extends SubCommand {
                     continue;
                 }
                 plot.claim(player, !plotIterator.hasNext(), null, true, true);
+                eventDispatcher.callPostAuto(player, plot);
             }
             final PlotAutoMergeEvent mergeEvent = this.eventDispatcher.callAutoMerge(
                     plots.get(0),

Core/src/main/java/com/plotsquared/core/command/Claim.java

@@ -208,13 +208,15 @@ public class Claim extends SubCommand {
                                     Template.of("value", "Auto merge on claim")
                             );
                         } else {
-                            plot.getPlotModificationManager().autoMerge(
+                            if (plot.getPlotModificationManager().autoMerge(
                                     mergeEvent.getDir(),
                                     mergeEvent.getMax(),
                                     player.getUUID(),
                                     player,
                                     true
-                            );
+                            )) {
+                                eventDispatcher.callPostMerge(player, plot);
+                            }
                         }
                     }
                     return null;

Core/src/main/java/com/plotsquared/core/command/Delete.java

@@ -130,6 +130,7 @@ public class Delete extends SubCommand {
                         Template.of("amount", String.valueOf(System.currentTimeMillis() - start)),
                         Template.of("plot", plot.getId().toString())
                 );
+                eventDispatcher.callPostDelete(plot);
             });
             if (result) {
                 plot.addRunning();

Core/src/main/java/com/plotsquared/core/command/Merge.java

@@ -189,6 +189,7 @@ public class Merge extends SubCommand {
                     );
                 }
                 player.sendMessage(TranslatableCaption.of("merge.success_merge"));
+                eventDispatcher.callPostMerge(player, plot);
                 return true;
             }
             player.sendMessage(TranslatableCaption.of("merge.no_available_automerge"));
@@ -225,6 +226,7 @@ public class Merge extends SubCommand {
                 );
             }
             player.sendMessage(TranslatableCaption.of("merge.success_merge"));
+            eventDispatcher.callPostMerge(player, plot);
             return true;
         }
         Plot adjacent = plot.getRelative(direction);
@@ -272,6 +274,7 @@ public class Merge extends SubCommand {
                     );
                 }
                 player.sendMessage(TranslatableCaption.of("merge.success_merge"));
+                eventDispatcher.callPostMerge(player, plot);
             };
             if (!force && hasConfirmation(player)) {
                 CmdConfirm.addPending(accepter, MINI_MESSAGE.serialize(MINI_MESSAGE

Core/src/main/java/com/plotsquared/core/command/Owner.java

@@ -44,6 +44,7 @@ import com.plotsquared.core.util.TabCompletions;
 import com.plotsquared.core.util.task.TaskManager;
 import net.kyori.adventure.text.minimessage.Template;
 import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 import java.util.Collection;
 import java.util.Collections;
@@ -76,6 +77,7 @@ public class Owner extends SetCommand {
             );
             return false;
         }
+        @Nullable final UUID oldOwner = plot.getOwnerAbs();
         Set<Plot> plots = plot.getConnectedPlots();
 
         final Consumer<UUID> uuidConsumer = uuid -> {
@@ -124,12 +126,15 @@ public class Owner extends SetCommand {
                     );
                     return;
                 }
-                plot.getPlotModificationManager().unlinkPlot(unlinkEvent.isCreateRoad(), unlinkEvent.isCreateRoad());
+                if (plot.getPlotModificationManager().unlinkPlot(unlinkEvent.isCreateRoad(), unlinkEvent.isCreateRoad())) {
+                    eventDispatcher.callPostUnlink(plot, PlotUnlinkEvent.REASON.NEW_OWNER);
+                }
                 Set<Plot> connected = plot.getConnectedPlots();
                 for (Plot current : connected) {
                     current.unclaim();
                     current.getPlotModificationManager().removeSign();
                 }
+                eventDispatcher.callPostOwnerChange(player, plot, oldOwner);
                 player.sendMessage(TranslatableCaption.of("owner.set_owner"));
                 return;
             }
@@ -178,6 +183,7 @@ public class Owner extends SetCommand {
                         }
                         plot.getPlotModificationManager().setSign(finalName);
                         player.sendMessage(TranslatableCaption.of("owner.set_owner"));
+                        eventDispatcher.callPostOwnerChange(player, plot, oldOwner);
                         if (other != null) {
                             other.sendMessage(
                                     TranslatableCaption.of("owner.now_owner"),

Core/src/main/java/com/plotsquared/core/command/Unlink.java

@@ -109,6 +109,7 @@ public class Unlink extends SubCommand {
                 return;
             }
             player.sendMessage(TranslatableCaption.of("merge.unlink_success"));
+            eventDispatcher.callPostUnlink(plot, PlotUnlinkEvent.REASON.PLAYER_COMMAND);
         };
         if (hasConfirmation(player)) {
             CmdConfirm.addPending(player, "/plot unlink " + plot.getId(), runnable);

Core/src/main/java/com/plotsquared/core/events/post/PostPlayerAutoPlotEvent.java

@@ -0,0 +1,51 @@
+/*
+ *       _____  _       _    _____                                _
+ *      |  __ \| |     | |  / ____|                              | |
+ *      | |__) | | ___ | |_| (___   __ _ _   _  __ _ _ __ ___  __| |
+ *      |  ___/| |/ _ \| __|\___ \ / _` | | | |/ _` | '__/ _ \/ _` |
+ *      | |    | | (_) | |_ ____) | (_| | |_| | (_| | | |  __/ (_| |
+ *      |_|    |_|\___/ \__|_____/ \__, |\__,_|\__,_|_|  \___|\__,_|
+ *                                    | |
+ *                                    |_|
+ *            PlotSquared plot management system for Minecraft
+ *                  Copyright (C) 2021 IntellectualSites
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program 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 General Public License for more details.
+ *
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.plotsquared.core.events.post;
+
+import com.plotsquared.core.events.PlotPlayerEvent;
+import com.plotsquared.core.player.PlotPlayer;
+import com.plotsquared.core.plot.Plot;
+
+/**
+ * Called after a plot was chosen for a player by {@code /plot auto}
+ * <br>
+ * Called after {@link com.plotsquared.core.events.PlayerAutoPlotEvent} and only, if no listener cancelled the action.
+ *
+ * @since 6.2.0
+ */
+public class PostPlayerAutoPlotEvent extends PlotPlayerEvent {
+
+    /**
+     * Instantiate a new PlayerAutoPlotPostEvent.
+     *
+     * @param plotPlayer The player who claims a new plot by {@code /plot auto}.
+     * @param plot       The plot that is assigned to the player.
+     */
+    public PostPlayerAutoPlotEvent(final PlotPlayer<?> plotPlayer, final Plot plot) {
+        super(plotPlayer, plot);
+    }
+
+}

Core/src/main/java/com/plotsquared/core/events/post/PostPlotChangeOwnerEvent.java

@@ -0,0 +1,80 @@
+/*
+ *       _____  _       _    _____                                _
+ *      |  __ \| |     | |  / ____|                              | |
+ *      | |__) | | ___ | |_| (___   __ _ _   _  __ _ _ __ ___  __| |
+ *      |  ___/| |/ _ \| __|\___ \ / _` | | | |/ _` | '__/ _ \/ _` |
+ *      | |    | | (_) | |_ ____) | (_| | |_| | (_| | | |  __/ (_| |
+ *      |_|    |_|\___/ \__|_____/ \__, |\__,_|\__,_|_|  \___|\__,_|
+ *                                    | |
+ *                                    |_|
+ *            PlotSquared plot management system for Minecraft
+ *                  Copyright (C) 2021 IntellectualSites
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program 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 General Public License for more details.
+ *
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.plotsquared.core.events.post;
+
+import com.plotsquared.core.events.PlotPlayerEvent;
+import com.plotsquared.core.player.PlotPlayer;
+import com.plotsquared.core.plot.Plot;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+import java.util.UUID;
+
+/**
+ * Called after the owner of a plot was updated.
+ *
+ * @since 6.2.0
+ */
+public class PostPlotChangeOwnerEvent extends PlotPlayerEvent {
+
+    @Nullable
+    private final UUID oldOwner;
+
+    /**
+     * Instantiate a new PlotChangedOwnerEvent.
+     *
+     * @param initiator The player who executed the owner change.
+     * @param plot      The plot which owner was changed.
+     * @param oldOwner  The previous owner - if present, otherwise {@code null}.
+     */
+    public PostPlotChangeOwnerEvent(final PlotPlayer<?> initiator, final Plot plot, @Nullable UUID oldOwner) {
+        super(initiator, plot);
+        this.oldOwner = oldOwner;
+    }
+
+    /**
+     * @return the old owner of the plot - if present, otherwise {@code null}.
+     */
+    public @Nullable UUID getOldOwner() {
+        return oldOwner;
+    }
+
+    /**
+     * @return {@code true} if the plot had an owner, {@code false} otherwise.
+     * @see #getOldOwner()
+     */
+    public boolean hasOldOwner() {
+        return getOldOwner() != null;
+    }
+
+    /**
+     * @return {@code true} if the plot now has an owner, {@code false} otherwise.
+     * @see Plot#hasOwner()
+     */
+    public boolean hasNewOwner() {
+        return getPlot().hasOwner();
+    }
+
+}

Core/src/main/java/com/plotsquared/core/events/post/PostPlotDeleteEvent.java

@@ -0,0 +1,47 @@
+/*
+ *       _____  _       _    _____                                _
+ *      |  __ \| |     | |  / ____|                              | |
+ *      | |__) | | ___ | |_| (___   __ _ _   _  __ _ _ __ ___  __| |
+ *      |  ___/| |/ _ \| __|\___ \ / _` | | | |/ _` | '__/ _ \/ _` |
+ *      | |    | | (_) | |_ ____) | (_| | |_| | (_| | | |  __/ (_| |
+ *      |_|    |_|\___/ \__|_____/ \__, |\__,_|\__,_|_|  \___|\__,_|
+ *                                    | |
+ *                                    |_|
+ *            PlotSquared plot management system for Minecraft
+ *                  Copyright (C) 2021 IntellectualSites
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program 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 General Public License for more details.
+ *
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.plotsquared.core.events.post;
+
+import com.plotsquared.core.events.PlotEvent;
+import com.plotsquared.core.plot.Plot;
+
+/**
+ * Called after a {@link Plot} was deleted.
+ *
+ * @since 6.2.0
+ */
+public class PostPlotDeleteEvent extends PlotEvent {
+
+    /**
+     * Instantiate a new PlotDeleteEvent.
+     *
+     * @param plot The plot which was deleted.
+     */
+    public PostPlotDeleteEvent(final Plot plot) {
+        super(plot);
+    }
+
+}

Core/src/main/java/com/plotsquared/core/events/post/PostPlotMergeEvent.java

@@ -0,0 +1,49 @@
+/*
+ *       _____  _       _    _____                                _
+ *      |  __ \| |     | |  / ____|                              | |
+ *      | |__) | | ___ | |_| (___   __ _ _   _  __ _ _ __ ___  __| |
+ *      |  ___/| |/ _ \| __|\___ \ / _` | | | |/ _` | '__/ _ \/ _` |
+ *      | |    | | (_) | |_ ____) | (_| | |_| | (_| | | |  __/ (_| |
+ *      |_|    |_|\___/ \__|_____/ \__, |\__,_|\__,_|_|  \___|\__,_|
+ *                                    | |
+ *                                    |_|
+ *            PlotSquared plot management system for Minecraft
+ *                  Copyright (C) 2021 IntellectualSites
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program 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 General Public License for more details.
+ *
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.plotsquared.core.events.post;
+
+import com.plotsquared.core.events.PlotPlayerEvent;
+import com.plotsquared.core.player.PlotPlayer;
+import com.plotsquared.core.plot.Plot;
+
+/**
+ * Called after multiple plots were merged with another.
+ *
+ * @since 6.2.0
+ */
+public class PostPlotMergeEvent extends PlotPlayerEvent {
+
+    /**
+     * Instantiate a new PlotMergedEvent.
+     *
+     * @param plotPlayer The {@link PlotPlayer} that initiated the merge.
+     * @param plot       The final merged plot.
+     */
+    public PostPlotMergeEvent(final PlotPlayer<?> plotPlayer, final Plot plot) {
+        super(plotPlayer, plot);
+    }
+
+}

Core/src/main/java/com/plotsquared/core/events/post/PostPlotUnlinkEvent.java

@@ -0,0 +1,61 @@
+/*
+ *       _____  _       _    _____                                _
+ *      |  __ \| |     | |  / ____|                              | |
+ *      | |__) | | ___ | |_| (___   __ _ _   _  __ _ _ __ ___  __| |
+ *      |  ___/| |/ _ \| __|\___ \ / _` | | | |/ _` | '__/ _ \/ _` |
+ *      | |    | | (_) | |_ ____) | (_| | |_| | (_| | | |  __/ (_| |
+ *      |_|    |_|\___/ \__|_____/ \__, |\__,_|\__,_|_|  \___|\__,_|
+ *                                    | |
+ *                                    |_|
+ *            PlotSquared plot management system for Minecraft
+ *                  Copyright (C) 2021 IntellectualSites
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program 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 General Public License for more details.
+ *
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.plotsquared.core.events.post;
+
+import com.plotsquared.core.events.PlotEvent;
+import com.plotsquared.core.events.PlotUnlinkEvent;
+import com.plotsquared.core.plot.Plot;
+
+/**
+ * Called when several plots were unlinked.
+ *
+ * @since 6.2.0
+ */
+public class PostPlotUnlinkEvent extends PlotEvent {
+
+    private final PlotUnlinkEvent.REASON reason;
+
+    /**
+     * Instantiate a new PlotUnlinkedEvent.
+     *
+     * @param plot   The unlinked plot.
+     * @param reason The reason for the unlink.
+     */
+    public PostPlotUnlinkEvent(final Plot plot, PlotUnlinkEvent.REASON reason) {
+        super(plot);
+        this.reason = reason;
+    }
+
+    /**
+     * The original reason provided by {@link PlotUnlinkEvent}.
+     *
+     * @return The reason for the unlink.
+     */
+    public PlotUnlinkEvent.REASON getReason() {
+        return reason;
+    }
+
+}

Core/src/main/java/com/plotsquared/core/events/post/package-info.java

@@ -0,0 +1,33 @@
+/*
+ *       _____  _       _    _____                                _
+ *      |  __ \| |     | |  / ____|                              | |
+ *      | |__) | | ___ | |_| (___   __ _ _   _  __ _ _ __ ___  __| |
+ *      |  ___/| |/ _ \| __|\___ \ / _` | | | |/ _` | '__/ _ \/ _` |
+ *      | |    | | (_) | |_ ____) | (_| | |_| | (_| | | |  __/ (_| |
+ *      |_|    |_|\___/ \__|_____/ \__, |\__,_|\__,_|_|  \___|\__,_|
+ *                                    | |
+ *                                    |_|
+ *            PlotSquared plot management system for Minecraft
+ *                  Copyright (C) 2021 IntellectualSites
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program 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 General Public License for more details.
+ *
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+/**
+ * Contains events which are fired after specific actions are completed.
+ * <br>
+ * E.g. {@link com.plotsquared.core.events.PlotDeleteEvent} is called <b>before</b> a plot is actually deleted and useful for
+ * cancelling the action itself. {@link com.plotsquared.core.events.post.PostPlotDeleteEvent} will be called after the plot was
+ * deleted.
+ */
+package com.plotsquared.core.events.post;

Core/src/main/java/com/plotsquared/core/plot/PlotModificationManager.java

@@ -229,8 +229,8 @@ public final class PlotModificationManager {
                         !isDelete,
                         isDelete ? PlotUnlinkEvent.REASON.DELETE : PlotUnlinkEvent.REASON.CLEAR
                 );
-        if (event.getEventResult() != Result.DENY) {
+        if (event.getEventResult() != Result.DENY && this.unlinkPlot(event.isCreateRoad(), event.isCreateSign())) {
-            this.unlinkPlot(event.isCreateRoad(), event.isCreateSign());
+            PlotSquared.get().getEventDispatcher().callPostUnlink(plot, event.getReason());
         }
         final PlotManager manager = this.plot.getArea().getPlotManager();
         Runnable run = new Runnable() {
@@ -502,7 +502,9 @@ public final class PlotModificationManager {
                         }
                         return;
                     }
-                    plot.getPlotModificationManager().autoMerge(event.getDir(), event.getMax(), uuid, player, true);
+                    if (plot.getPlotModificationManager().autoMerge(event.getDir(), event.getMax(), uuid, player, true)) {
+                        PlotSquared.get().getEventDispatcher().callPostMerge(player, plot);
+                    }
                 }
             });
             return true;

Core/src/main/java/com/plotsquared/core/plot/expiration/ExpireManager.java

@@ -426,8 +426,11 @@ public class ExpireManager {
                     .callUnlink(plot.getArea(), plot, true, false,
                             PlotUnlinkEvent.REASON.EXPIRE_DELETE
                     );
-            if (event.getEventResult() != Result.DENY) {
+            if (event.getEventResult() != Result.DENY && plot.getPlotModificationManager().unlinkPlot(
-                plot.getPlotModificationManager().unlinkPlot(event.isCreateRoad(), event.isCreateSign());
+                    event.isCreateRoad(),
+                    event.isCreateSign()
+            )) {
+                this.eventDispatcher.callPostUnlink(plot, PlotUnlinkEvent.REASON.EXPIRE_DELETE);
             }
         }
         for (UUID helper : plot.getTrusted()) {

Core/src/main/java/com/plotsquared/core/util/EventDispatcher.java

@@ -51,6 +51,11 @@ import com.plotsquared.core.events.PlotMergeEvent;
 import com.plotsquared.core.events.PlotRateEvent;
 import com.plotsquared.core.events.PlotUnlinkEvent;
 import com.plotsquared.core.events.TeleportCause;
+import com.plotsquared.core.events.post.PostPlayerAutoPlotEvent;
+import com.plotsquared.core.events.post.PostPlotChangeOwnerEvent;
+import com.plotsquared.core.events.post.PostPlotDeleteEvent;
+import com.plotsquared.core.events.post.PostPlotMergeEvent;
+import com.plotsquared.core.events.post.PostPlotUnlinkEvent;
 import com.plotsquared.core.listener.PlayerBlockEventType;
 import com.plotsquared.core.location.Direction;
 import com.plotsquared.core.location.Location;
@@ -135,6 +140,12 @@ public class EventDispatcher {
         return event;
     }
 
+    public PostPlayerAutoPlotEvent callPostAuto(PlotPlayer<?> player, Plot plot) {
+        PostPlayerAutoPlotEvent event = new PostPlayerAutoPlotEvent(player, plot);
+        callEvent(event);
+        return event;
+    }
+
     public PlayerAutoPlotsChosenEvent callAutoPlotsChosen(
             PlotPlayer<?> player, List<Plot> plots
     ) {
@@ -174,6 +185,12 @@ public class EventDispatcher {
         return event;
     }
 
+    public PostPlotDeleteEvent callPostDelete(Plot plot) {
+        PostPlotDeleteEvent event = new PostPlotDeleteEvent(plot);
+        callEvent(event);
+        return event;
+    }
+
     public PlotFlagAddEvent callFlagAdd(PlotFlag<?, ?> flag, Plot plot) {
         PlotFlagAddEvent event = new PlotFlagAddEvent(flag, plot);
         callEvent(event);
@@ -192,6 +209,12 @@ public class EventDispatcher {
         return event;
     }
 
+    public PostPlotMergeEvent callPostMerge(PlotPlayer<?> player, Plot plot) {
+        PostPlotMergeEvent event = new PostPlotMergeEvent(player, plot);
+        callEvent(event);
+        return event;
+    }
+
     public PlotAutoMergeEvent callAutoMerge(Plot plot, List<PlotId> plots) {
         PlotAutoMergeEvent event = new PlotAutoMergeEvent(plot.getWorldName(), plot, plots);
         callEvent(event);
@@ -207,6 +230,12 @@ public class EventDispatcher {
         return event;
     }
 
+    public PostPlotUnlinkEvent callPostUnlink(Plot plot, PlotUnlinkEvent.REASON reason) {
+        PostPlotUnlinkEvent event = new PostPlotUnlinkEvent(plot, reason);
+        callEvent(event);
+        return event;
+    }
+
     public PlayerEnterPlotEvent callEntry(PlotPlayer<?> player, Plot plot) {
         PlayerEnterPlotEvent event = new PlayerEnterPlotEvent(player, plot);
         callEvent(event);
@@ -256,6 +285,12 @@ public class EventDispatcher {
         return event;
     }
 
+    public PostPlotChangeOwnerEvent callPostOwnerChange(PlotPlayer<?> player, Plot plot, @Nullable UUID oldOwner) {
+        PostPlotChangeOwnerEvent event = new PostPlotChangeOwnerEvent(player, plot, oldOwner);
+        callEvent(event);
+        return event;
+    }
+
     public PlotRateEvent callRating(PlotPlayer<?> player, Plot plot, Rating rating) {
         PlotRateEvent event = new PlotRateEvent(player, rating, plot);
         eventBus.post(event);

Core/src/main/java/com/plotsquared/core/util/task/AutoClaimFinishTask.java

@@ -69,6 +69,7 @@ public final class AutoClaimFinishTask implements Callable<Boolean> {
             return false;
         }
         plot.claim(player, true, schematic, false, true);
+        eventDispatcher.callPostAuto(player, plot);
         if (area.isAutoMerge()) {
             PlotMergeEvent event = this.eventDispatcher.callMerge(plot, Direction.ALL, Integer.MAX_VALUE, player);
             if (event.getEventResult() == Result.DENY) {
@@ -77,7 +78,9 @@ public final class AutoClaimFinishTask implements Callable<Boolean> {
                         Templates.of("value", "Auto Merge")
                 );
             } else {
-                plot.getPlotModificationManager().autoMerge(event.getDir(), event.getMax(), player.getUUID(), player, true);
+                if (plot.getPlotModificationManager().autoMerge(event.getDir(), event.getMax(), player.getUUID(), player, true)) {
+                    eventDispatcher.callPostMerge(player, plot);
+                }
             }
         }
         return true;