Support optional 'path' config type

Initial work needed for this to work (config definition and config library)

1 files changed, 8 insertions, 0 deletions

diff --git a/config-lib/src/main/java/com/yahoo/config/LeafNodeVector.java b/config-lib/src/main/java/com/yahoo/config/LeafNodeVector.java
index a4fea95088d..cfb8cd4eebd 100644
--- a/config-lib/src/main/java/com/yahoo/config/LeafNodeVector.java
+++ b/config-lib/src/main/java/com/yahoo/config/LeafNodeVector.java
@@ -8,6 +8,7 @@ import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
+import java.util.Optional;
 
 /**
  * A vector of leaf nodes.
@@ -71,6 +72,13 @@ public class LeafNodeVector<REAL, NODE extends LeafNode<REAL>> extends NodeVecto
         return new LeafNodeVector<>(paths, new PathNode());
     }
 
+    public static LeafNodeVector<Optional<Path>, OptionalPathNode> createOptionalPathNodeVector(Collection<Optional<FileReference>> values) {
+        List<Optional<Path>> paths = new ArrayList<>();
+        for (Optional<FileReference> fileReference : values)
+            paths.add(fileReference.map(reference -> Paths.get(reference.value())));
+        return new LeafNodeVector<>(paths, new OptionalPathNode());
+    }
+
     public static LeafNodeVector<File, UrlNode> createUrlNodeVector(Collection<UrlReference> values) {
         List<File> files = new ArrayList<>();
         for (UrlReference urlReference : values)