Add LivingEntity.hasLineOfSight. Addresses BUKKIT-1255

By: TomyLobo <tomylobo@nurfuerspam.de>

paper-api/src/main/java/org/bukkit/entity/LivingEntity.java

@@ -269,4 +269,13 @@ public interface LivingEntity extends Entity {
      * @return A collection of {@link PotionEffect}s
      */
     public Collection<PotionEffect> getActivePotionEffects();
+
+    /**
+     * Checks whether the entity has block line of sight to another.<br />
+     * This uses the same algorithm that hostile mobs use to find the closest player.
+     *
+     * @param other The entity to determine line of sight to.
+     * @return true if there is a line of sight, false if not.
+     */
+    public boolean hasLineOfSight(Entity other);
 }

paper-api/src/test/java/org/bukkit/plugin/messaging/TestPlayer.java

@@ -756,4 +756,8 @@ public class TestPlayer implements Player {
     public boolean isBlocking() {
         throw new UnsupportedOperationException("Not supported yet.");
     }
+
+    public boolean hasLineOfSight(Entity other) {
+        throw new UnsupportedOperationException("Not supported yet.");
+    }
 }