Add RayTraceConfigurationBuilder (#11907)

paper-api/src/main/java/io/papermc/paper/raytracing/PositionedRayTraceConfigurationBuilder.java

@@ -0,0 +1,112 @@
+package io.papermc.paper.raytracing;
+
+import java.util.function.Predicate;
+import org.bukkit.FluidCollisionMode;
+import org.bukkit.Location;
+import org.bukkit.block.Block;
+import org.bukkit.entity.Entity;
+import org.bukkit.util.Vector;
+import org.checkerframework.checker.index.qual.NonNegative;
+import org.jetbrains.annotations.Contract;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * A builder for configuring a raytrace with a starting location
+ * and direction.
+ */
+@NullMarked
+public interface PositionedRayTraceConfigurationBuilder {
+
+    /**
+     * Sets the starting location.
+     *
+     * @param start the new starting location
+     * @return a reference to this object
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder start(Location start);
+
+    /**
+     * Sets the direction.
+     *
+     * @param direction the new direction
+     * @return a reference to this object
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder direction(Vector direction);
+
+    /**
+     * Sets the maximum distance.
+     *
+     * @param maxDistance the new maxDistance
+     * @return a reference to this object
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder maxDistance(@NonNegative double maxDistance);
+
+    /**
+     * Sets the FluidCollisionMode when looking for block collisions.
+     * <p>
+     * If collisions with passable blocks are ignored, fluid collisions are
+     * ignored as well regardless of the fluid collision mode.
+     *
+     * @param fluidCollisionMode the new FluidCollisionMode
+     * @return a reference to this object
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder fluidCollisionMode(FluidCollisionMode fluidCollisionMode);
+
+    /**
+     * Sets whether the raytrace should ignore passable blocks when looking for
+     * block collisions.
+     * <p>
+     * If collisions with passable blocks are ignored, fluid collisions are
+     * ignored as well regardless of the fluid collision mode.
+     * <p>
+     * Portal blocks are only considered passable if the ray starts within them.
+     * Apart from that collisions with portal blocks will be considered even if
+     * collisions with passable blocks are otherwise ignored.
+     *
+     * @param ignorePassableBlocks if the raytrace should ignore passable blocks
+     * @return a reference to this object
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder ignorePassableBlocks(boolean ignorePassableBlocks);
+
+    /**
+     * Sets the size of the raytrace when looking for entity collisions.
+     *
+     * @param raySize the new raytrace size
+     * @return a reference to this object
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder raySize(@NonNegative double raySize);
+
+    /**
+     * Sets the current entity filter when looking for entity collisions.
+     *
+     * @param entityFilter predicate for entities the ray can potentially collide with
+     * @return a reference to this object
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder entityFilter(Predicate<? super Entity> entityFilter);
+
+    /**
+     * Sets the current block filter when looking for block collisions.
+     *
+     * @param blockFilter predicate for blocks the ray can potentially collide with
+     * @return a reference to this object
+     */
+    @Contract(value = "_ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder blockFilter(Predicate<? super Block> blockFilter);
+
+    /**
+     * Sets the targets for the rayTrace.
+     *
+     * @param first the first target
+     * @param others the other targets
+     * @return a reference to this object
+     */
+    @Contract(value = "_, _ -> this", mutates = "this")
+    PositionedRayTraceConfigurationBuilder targets(RayTraceTarget first, RayTraceTarget... others);
+}

paper-api/src/main/java/io/papermc/paper/raytracing/RayTraceTarget.java

@@ -0,0 +1,9 @@
+package io.papermc.paper.raytracing;
+
+/**
+ * List of Targets a builder can target.
+ */
+public enum RayTraceTarget {
+    ENTITY,
+    BLOCK
+}

paper-api/src/main/java/org/bukkit/World.java

@@ -1,6 +1,7 @@
 package org.bukkit;
 
 import java.io.File;
+import io.papermc.paper.raytracing.PositionedRayTraceConfigurationBuilder;
 import org.bukkit.generator.ChunkGenerator;
 
 import java.util.ArrayList;
@@ -1938,6 +1939,20 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
     @Nullable RayTraceResult rayTrace(io.papermc.paper.math.@NotNull Position start, @NotNull Vector direction, double maxDistance, @NotNull FluidCollisionMode fluidCollisionMode, boolean ignorePassableBlocks, double raySize, @Nullable Predicate<? super Entity> filter, @Nullable Predicate<? super Block> canCollide);
     // Paper end
 
+    /**
+     * Performs a ray trace that checks for collisions with the specified
+     * targets.
+     * <p>
+     * This may cause loading of chunks! Some implementations may impose
+     * artificial restrictions on the maximum distance.
+     *
+     * @param builderConsumer a consumer to configure the ray trace configuration.
+     *     The received builder is not valid for use outside the consumer
+     * @return the closest ray trace hit result with either a block or an
+     *     entity, or <code>null</code> if there is no hit
+     */
+    @Nullable RayTraceResult rayTrace(@NotNull Consumer<PositionedRayTraceConfigurationBuilder> builderConsumer);
+
     /**
      * Gets the default spawn {@link Location} of this world
      *

paper-server/src/main/java/io/papermc/paper/raytracing/PositionedRayTraceConfigurationBuilderImpl.java

@@ -0,0 +1,90 @@
+package io.papermc.paper.raytracing;
+
+import com.google.common.base.Preconditions;
+import java.util.EnumSet;
+import java.util.OptionalDouble;
+import java.util.function.Predicate;
+import org.bukkit.FluidCollisionMode;
+import org.bukkit.Location;
+import org.bukkit.block.Block;
+import org.bukkit.entity.Entity;
+import org.bukkit.util.Vector;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
+
+@NullMarked
+public class PositionedRayTraceConfigurationBuilderImpl implements PositionedRayTraceConfigurationBuilder {
+
+    public @Nullable Location start;
+    public @Nullable Vector direction;
+    public OptionalDouble maxDistance = OptionalDouble.empty();
+    public FluidCollisionMode fluidCollisionMode = FluidCollisionMode.NEVER;
+    public boolean ignorePassableBlocks;
+    public double raySize = 0.0D;
+    public @Nullable Predicate<? super Entity> entityFilter;
+    public @Nullable Predicate<? super Block> blockFilter;
+    public EnumSet<RayTraceTarget> targets = EnumSet.noneOf(RayTraceTarget.class);
+
+    @Override
+    public PositionedRayTraceConfigurationBuilder start(final Location start) {
+        Preconditions.checkArgument(start != null, "start must not be null");
+        this.start = start.clone();
+        return this;
+    }
+
+    @Override
+    public PositionedRayTraceConfigurationBuilder direction(final Vector direction) {
+        Preconditions.checkArgument(direction != null, "direction must not be null");
+        this.direction = direction.clone();
+        return this;
+    }
+
+    @Override
+    public PositionedRayTraceConfigurationBuilder maxDistance(final double maxDistance) {
+        Preconditions.checkArgument(maxDistance >= 0, "maxDistance must be non-negative");
+        this.maxDistance = OptionalDouble.of(maxDistance);
+        return this;
+    }
+
+    @Override
+    public PositionedRayTraceConfigurationBuilder fluidCollisionMode(final FluidCollisionMode fluidCollisionMode) {
+        Preconditions.checkArgument(fluidCollisionMode != null, "fluidCollisionMode must not be null");
+        this.fluidCollisionMode = fluidCollisionMode;
+        return this;
+    }
+
+    @Override
+    public PositionedRayTraceConfigurationBuilder ignorePassableBlocks(final boolean ignorePassableBlocks) {
+        this.ignorePassableBlocks = ignorePassableBlocks;
+        return this;
+    }
+
+    @Override
+    public PositionedRayTraceConfigurationBuilder raySize(final double raySize) {
+        Preconditions.checkArgument(raySize >= 0, "raySize must be non-negative");
+        this.raySize = raySize;
+        return this;
+    }
+
+    @Override
+    public PositionedRayTraceConfigurationBuilder entityFilter(final Predicate<? super Entity> entityFilter) {
+        Preconditions.checkArgument(entityFilter != null, "entityFilter must not be null");
+        this.entityFilter = entityFilter;
+        return this;
+    }
+
+    @Override
+    public PositionedRayTraceConfigurationBuilder blockFilter(final Predicate<? super Block> blockFilter) {
+        Preconditions.checkArgument(blockFilter != null, "blockFilter must not be null");
+        this.blockFilter = blockFilter;
+        return this;
+    }
+
+    @Override
+    public PositionedRayTraceConfigurationBuilder targets(final RayTraceTarget first, final RayTraceTarget... others) {
+        Preconditions.checkArgument(first != null, "first must not be null");
+        Preconditions.checkArgument(others != null, "others must not be null");
+        this.targets = EnumSet.of(first, others);
+        return this;
+    }
+}

paper-server/src/main/java/org/bukkit/craftbukkit/CraftWorld.java

@@ -6,9 +6,12 @@ import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import com.mojang.datafixers.util.Pair;
 import io.papermc.paper.FeatureHooks;
+import io.papermc.paper.raytracing.RayTraceTarget;
 import io.papermc.paper.registry.RegistryAccess;
 import io.papermc.paper.registry.RegistryKey;
 import it.unimi.dsi.fastutil.longs.Long2ObjectMap;
+import io.papermc.paper.raytracing.PositionedRayTraceConfigurationBuilder;
+import io.papermc.paper.raytracing.PositionedRayTraceConfigurationBuilderImpl;
 import it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap;
 import java.io.File;
 import java.util.ArrayList;
@@ -1248,6 +1251,26 @@ public class CraftWorld extends CraftRegionAccessor implements World {
         return blockHit;
     }
 
+    @Override
+    public RayTraceResult rayTrace(Consumer<PositionedRayTraceConfigurationBuilder> builderConsumer) {
+        PositionedRayTraceConfigurationBuilderImpl builder = new PositionedRayTraceConfigurationBuilderImpl();
+
+        builderConsumer.accept(builder);
+        Preconditions.checkArgument(builder.start != null, "Start location cannot be null");
+        Preconditions.checkArgument(builder.direction != null, "Direction vector cannot be null");
+        Preconditions.checkArgument(builder.maxDistance.isPresent(), "Max distance must be set");
+        Preconditions.checkArgument(!builder.targets.isEmpty(), "At least one target");
+
+        final double maxDistance = builder.maxDistance.getAsDouble();
+        if (builder.targets.contains(RayTraceTarget.ENTITY)) {
+            if (builder.targets.contains(RayTraceTarget.BLOCK)) {
+                return this.rayTrace(builder.start, builder.direction, maxDistance, builder.fluidCollisionMode, builder.ignorePassableBlocks, builder.raySize, builder.entityFilter, builder.blockFilter);
+            }
+            return this.rayTraceEntities(builder.start, builder.direction, maxDistance, builder.raySize, builder.entityFilter);
+        }
+        return this.rayTraceBlocks(builder.start, builder.direction, maxDistance, builder.fluidCollisionMode, builder.ignorePassableBlocks, builder.blockFilter);
+    }
+
     @Override
     public List<Player> getPlayers() {
         List<Player> list = new ArrayList<Player>(this.world.players().size());