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
+}