Paper/patches/api/0246-Add-StructuresLocateEvent.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: dfsek <dfsek@protonmail.com>
Date: Tue, 15 Sep 2020 21:59:16 -0700
Subject: [PATCH] Add StructuresLocateEvent

Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>

diff --git a/src/main/java/io/papermc/paper/event/world/StructureLocateEvent.java b/src/main/java/io/papermc/paper/event/world/StructureLocateEvent.java
new file mode 100644
index 0000000000000000000000000000000000000000..1ac3369455972aeb1ade5dc023d1f818cd3535fa
--- /dev/null
+++ b/src/main/java/io/papermc/paper/event/world/StructureLocateEvent.java
@@ -0,0 +1,163 @@
+package io.papermc.paper.event.world;
+
+import org.bukkit.Location;
+import org.bukkit.StructureType;
+import org.bukkit.World;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.world.WorldEvent;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Called <b>before</b> a structure/feature is located.
+ * This happens when:
+ * <ul>
+ *     <li>The /locate command is used.<br></li>
+ *     <li>An Eye of Ender is used.</li>
+ *     <li>An Explorer/Treasure Map is activated.</li>
+ *     <li>{@link World#locateNearestStructure(Location, StructureType, int, boolean)} is invoked.</li>
+ * </ul>
+ *
+ * @deprecated no longer used, see {@link StructuresLocateEvent}
+ */
+@Deprecated(forRemoval = true) @ApiStatus.ScheduledForRemoval(inVersion = "1.21")
+public class StructureLocateEvent extends WorldEvent implements Cancellable {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private final Location origin;
+    private Location result = null;
+    private StructureType type;
+    private int radius;
+    private boolean findUnexplored;
+
+    private boolean cancelled;
+
+    @ApiStatus.Internal
+    public StructureLocateEvent(@NotNull World world, @NotNull Location origin, @NotNull StructureType structureType, int radius, boolean findUnexplored) {
+        super(world);
+        this.origin = origin;
+        this.type = structureType;
+        this.radius = radius;
+        this.findUnexplored = findUnexplored;
+    }
+
+    /**
+     * Gets the location set as the structure location, if it was defined.
+     * <p>
+     * Returns {@code null} if it has not been set by {@link StructureLocateEvent#setResult(Location)}.
+     * Since this event fires <i>before</i> the search is done, the actual location is unknown at this point.
+     *
+     * @return The result location, if it has been set. {@code null} if it has not.
+     * @see World#locateNearestStructure(Location, StructureType, int, boolean)
+     */
+    @Nullable
+    public Location getResult() {
+        return this.result;
+    }
+
+    /**
+     * Sets the result {@link Location}. This causes the search to be skipped, and the location passed here to be used as the result.
+     *
+     * @param result the {@link Location} of the structure.
+     */
+    public void setResult(@Nullable Location result) {
+        this.result = result;
+    }
+
+    /**
+     * Gets the {@link StructureType} that is to be located.
+     *
+     * @return the structure type.
+     */
+    @NotNull
+    public StructureType getType() {
+        return this.type;
+    }
+
+    /**
+     * Sets the {@link StructureType} that is to be located.
+     *
+     * @param type the structure type.
+     */
+    public void setType(@NotNull StructureType type) {
+        this.type = type;
+    }
+
+    /**
+     * Gets the {@link Location} from which the search is to be conducted.
+     *
+     * @return {@link Location} where search begins
+     */
+    @NotNull
+    public Location getOrigin() {
+        return this.origin;
+    }
+
+    /**
+     * Gets the search radius in which to attempt locating the structure.
+     * <p>
+     * This radius may not always be obeyed during the structure search!
+     *
+     * @return the search radius.
+     */
+    public int getRadius() {
+        return this.radius;
+    }
+
+    /**
+     * Sets the search radius in which to attempt locating the structure.
+     * <p>
+     * This radius may not always be obeyed during the structure search!
+     *
+     * @param radius the search radius.
+     */
+    public void setRadius(int radius) {
+        this.radius = radius;
+    }
+
+    /**
+     * Gets whether to search exclusively for unexplored structures.
+     * <p>
+     * As with the search radius, this value is not always obeyed.
+     *
+     * @return Whether to search for only unexplored structures.
+     */
+    public boolean shouldFindUnexplored() {
+        return this.findUnexplored;
+    }
+
+    /**
+     * Sets whether to search exclusively for unexplored structures.
+     * <p>
+     * As with the search radius, this value is not always obeyed.
+     *
+     * @param findUnexplored Whether to search for only unexplored structures.
+     */
+    public void setFindUnexplored(boolean findUnexplored) {
+        this.findUnexplored = findUnexplored;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return this.cancelled;
+    }
+
+    @Override
+    public void setCancelled(boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    @NotNull
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+
+    @NotNull
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+}
diff --git a/src/main/java/io/papermc/paper/event/world/StructuresLocateEvent.java b/src/main/java/io/papermc/paper/event/world/StructuresLocateEvent.java
new file mode 100644
index 0000000000000000000000000000000000000000..582af444b058708638683e7d6f9b79685c04c061
--- /dev/null
+++ b/src/main/java/io/papermc/paper/event/world/StructuresLocateEvent.java
@@ -0,0 +1,213 @@
+package io.papermc.paper.event.world;
+
+import io.papermc.paper.math.Position;
+import io.papermc.paper.util.TransformingRandomAccessList;
+import io.papermc.paper.world.structure.ConfiguredStructure;
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+import org.bukkit.Location;
+import org.bukkit.World;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.world.WorldEvent;
+import org.bukkit.generator.structure.Structure;
+import org.bukkit.generator.structure.StructureType;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.jetbrains.annotations.UnmodifiableView;
+
+/**
+ * Called <b>before</b> a set of configured structures is located.
+ * This happens when:
+ * <ul>
+ *     <li>The /locate command is used.<br></li>
+ *     <li>An Eye of Ender is used.</li>
+ *     <li>An Explorer/Treasure Map is activated.</li>
+ *     <li>A dolphin swims to a treasure location.</li>
+ *     <li>A trade is done with a villager for a map.</li>
+ *     <li>{@link World#locateNearestStructure(Location, StructureType, int, boolean)} is invoked.</li>
+ *     <li>{@link World#locateNearestStructure(Location, Structure, int, boolean)} is invoked.</li>
+ * </ul>
+ */
+public class StructuresLocateEvent extends WorldEvent implements Cancellable {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private final Location origin;
+    private Result result;
+    private List<Structure> structures;
+    private List<ConfiguredStructure> legacy$structures;
+    private int radius;
+    private boolean findUnexplored;
+
+    private boolean cancelled;
+
+    @ApiStatus.Internal
+    public StructuresLocateEvent(@NotNull World world, @NotNull Location origin, @NotNull List<Structure> structures, int radius, boolean findUnexplored) {
+        super(world);
+        this.origin = origin;
+        this.setStructures(structures);
+        this.radius = radius;
+        this.findUnexplored = findUnexplored;
+    }
+
+    /**
+     * Gets the {@link Location} from which the search is to be conducted.
+     *
+     * @return {@link Location} where search begins
+     */
+    public @NotNull Location getOrigin() {
+        return this.origin.clone();
+    }
+
+    /**
+     * Gets the {@link Location} and {@link Structure} set as the result, if it was defined.
+     * <p>
+     * Returns {@code null} if it has not been set by {@link StructuresLocateEvent#setResult(Result)}.
+     * Since this event fires <i>before</i> the search is done, the actual result is unknown at this point.
+     *
+     * @return The result location and structure, if it has been set. {@code null} if it has not.
+     * @see World#locateNearestStructure(Location, StructureType, int, boolean)
+     */
+    public @Nullable Result getResult() {
+        return this.result;
+    }
+
+    /**
+     * Sets the result {@link Location} and {@link Structure}. This causes the search to be
+     * skipped, and the result object passed here to be used as the result.
+     *
+     * @param result the {@link Location} and {@link Structure} of the search.
+     */
+    public void setResult(@Nullable Result result) {
+        this.result = result;
+    }
+
+    /**
+     * Gets a mutable list of ConfiguredStructures that are valid targets for the search.
+     *
+     * @return a mutable list of ConfiguredStructures
+     * @deprecated use {@link #getStructures()}
+     */
+    @Deprecated(forRemoval = true)
+    public @NotNull List<ConfiguredStructure> getConfiguredStructures() {
+        return this.legacy$structures;
+    }
+
+    /**
+     * Sets the list of ConfiguredStructures that are valid targets for the search.
+     *
+     * @param configuredStructures a list of ConfiguredStructure targets
+     * @deprecated use {@link #setStructures(List)}
+     */
+    @Deprecated(forRemoval = true)
+    public void setConfiguredStructures(@NotNull List<ConfiguredStructure> configuredStructures) {
+        this.setStructures(configuredStructures.stream().map(ConfiguredStructure::toModern).toList());
+    }
+
+    /**
+     * Gets an unmodifiable list of Structures that are valid targets for the search.
+     *
+     * @return an unmodifiable list of Structures
+     */
+    public @NotNull @UnmodifiableView List<Structure> getStructures() {
+        return Collections.unmodifiableList(this.structures);
+    }
+
+    /**
+     * Sets the list of Structures that are valid targets for the search.
+     *
+     * @param structures a list of Structures targets
+     */
+    public void setStructures(final @NotNull List<Structure> structures) {
+        this.structures = structures;
+        this.legacy$structures = new TransformingRandomAccessList<>(this.structures, ConfiguredStructure::fromModern, ConfiguredStructure::toModern);
+    }
+
+    /**
+     * Gets the search radius in which to attempt locating the structure.
+     * <p>
+     * This radius may not always be obeyed during the structure search!
+     *
+     * @return the search radius (in chunks)
+     */
+    public int getRadius() {
+        return this.radius;
+    }
+
+    /**
+     * Sets the search radius in which to attempt locating the structure.
+     * <p>
+     * This radius may not always be obeyed during the structure search!
+     *
+     * @param radius the search radius (in chunks)
+     */
+    public void setRadius(int radius) {
+        this.radius = radius;
+    }
+
+    /**
+     * Gets whether to search exclusively for unexplored structures.
+     * <p>
+     * As with the search radius, this value is not always obeyed.
+     *
+     * @return Whether to search for only unexplored structures.
+     */
+    public boolean shouldFindUnexplored() {
+        return this.findUnexplored;
+    }
+
+    /**
+     * Sets whether to search exclusively for unexplored structures.
+     * <p>
+     * As with the search radius, this value is not always obeyed.
+     *
+     * @param findUnexplored Whether to search for only unexplored structures.
+     */
+    public void setFindUnexplored(boolean findUnexplored) {
+        this.findUnexplored = findUnexplored;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return this.cancelled;
+    }
+
+    @Override
+    public void setCancelled(boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    @Override
+    public @NotNull HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+
+    public static @NotNull HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+
+    /**
+     * Result for {@link StructuresLocateEvent}.
+     */
+    public record Result(@NotNull Position pos, @NotNull Structure structure) {
+
+        @Deprecated(forRemoval = true)
+        public Result(final @NotNull Location position, @NotNull ConfiguredStructure configuredStructure) {
+            this(position, configuredStructure.toModern());
+        }
+
+        @Deprecated(forRemoval = true)
+        public @NotNull ConfiguredStructure configuredStructure() {
+            return Objects.requireNonNull(ConfiguredStructure.fromModern(this.structure), "Please use the newer Structure API");
+        }
+
+        @Deprecated(forRemoval = true)
+        public @NotNull Location position() {
+            //noinspection DataFlowIssue
+            return this.pos.toLocation(null);
+        }
+    }
+}
diff --git a/src/main/java/io/papermc/paper/world/structure/ConfiguredStructure.java b/src/main/java/io/papermc/paper/world/structure/ConfiguredStructure.java
new file mode 100644
index 0000000000000000000000000000000000000000..1e7b53f9bc13dcd5a0a4a40004591e4f850496a0
--- /dev/null
+++ b/src/main/java/io/papermc/paper/world/structure/ConfiguredStructure.java
@@ -0,0 +1,113 @@
+package io.papermc.paper.world.structure;
+
+import io.papermc.paper.registry.Reference;
+import java.util.Objects;
+import org.bukkit.Keyed;
+import org.bukkit.NamespacedKey;
+import org.bukkit.Registry;
+import org.bukkit.StructureType;
+import org.bukkit.generator.structure.Structure;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Represents a configured structure each with a
+ * {@link StructureType}. Multiple ConfiguredStructures can have
+ * the same {@link StructureType}.
+ * @deprecated use {@link Structure}
+ */
+@Deprecated(forRemoval = true)
+@ApiStatus.ScheduledForRemoval(inVersion = "1.21")
+public final class ConfiguredStructure implements Keyed {
+
+    public static final Reference<ConfiguredStructure> PILLAGER_OUTPOST = create("pillager_outpost");
+    public static final Reference<ConfiguredStructure> MINESHAFT = create("mineshaft");
+    public static final Reference<ConfiguredStructure> MINESHAFT_MESA = create("mineshaft_mesa");
+    public static final Reference<ConfiguredStructure> WOODLAND_MANSION = create("mansion");
+    public static final Reference<ConfiguredStructure> JUNGLE_TEMPLE = create("jungle_pyramid");
+    public static final Reference<ConfiguredStructure> DESERT_PYRAMID = create("desert_pyramid");
+    public static final Reference<ConfiguredStructure> IGLOO = create("igloo");
+    public static final Reference<ConfiguredStructure> SHIPWRECK = create("shipwreck");
+    public static final Reference<ConfiguredStructure> SHIPWRECK_BEACHED = create("shipwreck_beached");
+    public static final Reference<ConfiguredStructure> SWAMP_HUT = create("swamp_hut");
+    public static final Reference<ConfiguredStructure> STRONGHOLD = create("stronghold");
+    public static final Reference<ConfiguredStructure> OCEAN_MONUMENT = create("monument");
+    public static final Reference<ConfiguredStructure> OCEAN_RUIN_COLD = create("ocean_ruin_cold");
+    public static final Reference<ConfiguredStructure> OCEAN_RUIN_WARM = create("ocean_ruin_warm");
+    public static final Reference<ConfiguredStructure> FORTRESS = create("fortress");
+    public static final Reference<ConfiguredStructure> NETHER_FOSSIL = create("nether_fossil");
+    public static final Reference<ConfiguredStructure> END_CITY = create("end_city");
+    public static final Reference<ConfiguredStructure> BURIED_TREASURE = create("buried_treasure");
+    public static final Reference<ConfiguredStructure> BASTION_REMNANT = create("bastion_remnant");
+    public static final Reference<ConfiguredStructure> VILLAGE_PLAINS = create("village_plains");
+    public static final Reference<ConfiguredStructure> VILLAGE_DESERT = create("village_desert");
+    public static final Reference<ConfiguredStructure> VILLAGE_SAVANNA = create("village_savanna");
+    public static final Reference<ConfiguredStructure> VILLAGE_SNOWY = create("village_snowy");
+    public static final Reference<ConfiguredStructure> VILLAGE_TAIGA = create("village_taiga");
+    public static final Reference<ConfiguredStructure> RUINED_PORTAL_STANDARD = create("ruined_portal");
+    public static final Reference<ConfiguredStructure> RUINED_PORTAL_DESERT = create("ruined_portal_desert");
+    public static final Reference<ConfiguredStructure> RUINED_PORTAL_JUNGLE = create("ruined_portal_jungle");
+    public static final Reference<ConfiguredStructure> RUINED_PORTAL_SWAMP = create("ruined_portal_swamp");
+    public static final Reference<ConfiguredStructure> RUINED_PORTAL_MOUNTAIN = create("ruined_portal_mountain");
+    public static final Reference<ConfiguredStructure> RUINED_PORTAL_OCEAN = create("ruined_portal_ocean");
+    public static final Reference<ConfiguredStructure> RUINED_PORTAL_NETHER = create("ruined_portal_nether");
+    // public static final Reference<ConfiguredStructure> ANCIENT_CITY = create("ancient_city"); // TODO remove when upstream adds "jigsaw" StructureType
+
+    private final NamespacedKey key;
+    private final StructureType structureType;
+
+    ConfiguredStructure(@NotNull NamespacedKey key, @NotNull StructureType structureType) {
+        this.key = key;
+        this.structureType = structureType;
+    }
+
+    @Override
+    public @NotNull NamespacedKey getKey() {
+        return this.key;
+    }
+
+    /**
+     * Gets the structure type for this configure structure.
+     *
+     * @return the structure type
+     */
+    public @NotNull StructureType getStructureType() {
+        return this.structureType;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        ConfiguredStructure structure = (ConfiguredStructure) o;
+        return this.key.equals(structure.key) && this.structureType.equals(structure.structureType);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.key, this.structureType);
+    }
+
+    @Override
+    public String toString() {
+        return "ConfiguredStructure{" +
+            "key=" + this.key +
+            ", structureType=" + this.structureType +
+            '}';
+    }
+
+    private static @NotNull Reference<ConfiguredStructure> create(@NotNull String name) {
+        return Reference.create(Registry.CONFIGURED_STRUCTURE, NamespacedKey.minecraft(name));
+    }
+
+    @ApiStatus.Internal
+    public @NotNull Structure toModern() {
+        return Objects.requireNonNull(Registry.STRUCTURE.get(this.key));
+    }
+
+    @ApiStatus.Internal
+    public static @Nullable ConfiguredStructure fromModern(@NotNull Structure structure) {
+        return Registry.CONFIGURED_STRUCTURE.get(structure.getKey());
+    }
+}
diff --git a/src/main/java/org/bukkit/Registry.java b/src/main/java/org/bukkit/Registry.java
index b3f8a2611ceb57f5d0b5c300fa80d8bad121498d..4bc53793aade0887fa650a4bbf51d2e57678bd90 100644
--- a/src/main/java/org/bukkit/Registry.java
+++ b/src/main/java/org/bukkit/Registry.java
@@ -268,6 +268,17 @@ public interface Registry<T extends Keyed> extends Iterable<T> {
      * @see GameEvent
      */
     Registry<GameEvent> GAME_EVENT = Objects.requireNonNull(Bukkit.getRegistry(GameEvent.class), "No registry present for GameEvent. This is a bug.");
+
+    // Paper start
+    /**
+     * Configured structures.
+     * @see io.papermc.paper.world.structure.ConfiguredStructure
+     * @deprecated use {@link #STRUCTURE}
+     */
+    @Deprecated(forRemoval = true)
+    Registry<io.papermc.paper.world.structure.ConfiguredStructure> CONFIGURED_STRUCTURE = Bukkit.getRegistry(io.papermc.paper.world.structure.ConfiguredStructure.class);
+    // Paper end
+
     /**
      * Get the object by its key.
      *