Clone Java optionals

Fixes #498

modules/API/src/main/java/com/comphenix/protocol/events/PacketContainer.java

@@ -86,7 +86,8 @@ public class PacketContainer implements Serializable {
 			.instanceProvider(DefaultInstances.DEFAULT)
 			.andThen(BukkitCloner.class)
 			.andThen(ImmutableDetector.class)
-			.andThen(OptionalCloner.class)
+			.andThen(JavaOptionalCloner.class)
+			.andThen(GuavaOptionalCloner.class)
 			.andThen(CollectionCloner.class)
 			.andThen(getSpecializedDeepClonerFactory())
 			.build();

modules/API/src/main/java/com/comphenix/protocol/reflect/cloning/GuavaOptionalCloner.java

@@ -6,14 +6,14 @@ package com.comphenix.protocol.reflect.cloning;
 import com.google.common.base.Optional;
 
 /**
- * A cloner that can clone Optional objects
+ * A cloner that can clone Guava Optional objects
  * @author dmulloy2
  */
 
-public class OptionalCloner implements Cloner {
+public class GuavaOptionalCloner implements Cloner {
 	protected Cloner wrapped;
 
-	public OptionalCloner(Cloner wrapped) {
+	public GuavaOptionalCloner(Cloner wrapped) {
 		this.wrapped = wrapped;
 	}
 

modules/API/src/main/java/com/comphenix/protocol/reflect/cloning/JavaOptionalCloner.java

@@ -0,0 +1,33 @@
+/**
+ * (c) 2018 dmulloy2
+ */
+package com.comphenix.protocol.reflect.cloning;
+
+import java.util.Optional;
+
+/**
+ * A cloner that can clone Java Optional objects
+ * @author dmulloy2
+ */
+public class JavaOptionalCloner implements Cloner {
+	protected Cloner wrapped;
+
+	public JavaOptionalCloner(Cloner wrapped) {
+		this.wrapped = wrapped;
+	}
+
+	@Override
+	public boolean canClone(Object source) {
+		return source instanceof Optional;
+	}
+
+	@Override
+	public Object clone(Object source) {
+		Optional<?> optional = (Optional<?>) source;
+		return optional.map(o -> wrapped.clone(o));
+	}
+
+	public Cloner getWrapped() {
+		return wrapped;
+	}
+}