Allow model evolution which removes clusters

1 files changed, 6 insertions, 0 deletions

diff --git a/vespajlib/src/main/java/com/yahoo/lang/SettableOptional.java b/vespajlib/src/main/java/com/yahoo/lang/SettableOptional.java
index 74abd4101a4..00ff06b8f01 100644
--- a/vespajlib/src/main/java/com/yahoo/lang/SettableOptional.java
+++ b/vespajlib/src/main/java/com/yahoo/lang/SettableOptional.java
@@ -1,6 +1,7 @@
 package com.yahoo.lang;
 
 import java.util.NoSuchElementException;
+import java.util.Optional;
 
 /**
  * An optional which contains a settable value
@@ -30,6 +31,11 @@ public final class SettableOptional<T> {
     public void set(T value) {
         this.value = value;
     }
+    
+    public Optional<T> asOptional() {
+        if (value == null) return Optional.empty();
+        return Optional.of(value);
+    }
 
 }