Undeprecate string features and be explicit

3 files changed, 21 insertions, 7 deletions

diff --git a/container-search/src/main/java/com/yahoo/search/dispatch/rpc/MapConverter.java b/container-search/src/main/java/com/yahoo/search/dispatch/rpc/MapConverter.java
index 638b89f657f..a71ec5d8345 100644
--- a/container-search/src/main/java/com/yahoo/search/dispatch/rpc/MapConverter.java
+++ b/container-search/src/main/java/com/yahoo/search/dispatch/rpc/MapConverter.java
@@ -45,8 +45,9 @@ public class MapConverter {
         }
     }
 
-    public static void convertMultiMap(Map<String, List<Object>> map, Consumer<StringProperty.Builder> stringInserter,
-            Consumer<TensorProperty.Builder> tensorInserter) {
+    public static void convertMultiMap(Map<String, List<Object>> map,
+                                       Consumer<StringProperty.Builder> stringInserter,
+                                       Consumer<TensorProperty.Builder> tensorInserter) {
         for (var entry : map.entrySet()) {
             if (entry.getValue() != null) {
                 var key = entry.getKey();
diff --git a/container-search/src/main/java/com/yahoo/search/dispatch/rpc/ProtobufSerialization.java b/container-search/src/main/java/com/yahoo/search/dispatch/rpc/ProtobufSerialization.java
index 0e1df2b3d9a..c60cf70bd59 100644
--- a/container-search/src/main/java/com/yahoo/search/dispatch/rpc/ProtobufSerialization.java
+++ b/container-search/src/main/java/com/yahoo/search/dispatch/rpc/ProtobufSerialization.java
@@ -185,7 +185,6 @@ public class ProtobufSerialization {
         }
         mergeRankProperties(ranking, builder::addRankProperties, builder::addTensorRankProperties);
     }
-
     static byte[] serializeResult(Result searchResult) {
         return convertFromResult(searchResult).toByteArray();
     }
diff --git a/container-search/src/main/java/com/yahoo/search/query/ranking/RankFeatures.java b/container-search/src/main/java/com/yahoo/search/query/ranking/RankFeatures.java
index 7d43c09f6fb..f32b40e94d5 100644
--- a/container-search/src/main/java/com/yahoo/search/query/ranking/RankFeatures.java
+++ b/container-search/src/main/java/com/yahoo/search/query/ranking/RankFeatures.java
@@ -41,11 +41,10 @@ public class RankFeatures implements Cloneable {
     }
 
     /**
-     * Sets a rank feature to a value represented as a string.
-     *
-     * @deprecated set either a double or a tensor
+     * Sets a rank feature to a string. This will be available as the hash value
+     * of the string in ranking, so it can be used in equality comparisons
+     * with other string, but not for any other purpose.
      */
-    @Deprecated // TODO: Remove on Vespa 8
     public void put(String name, String value) {
         features.put(name, value);
     }
@@ -93,6 +92,21 @@ public class RankFeatures implements Cloneable {
     }
 
     /**
+     * Returns a rank feature as a string, or empty if there is no value with this name.
+     *
+     * @throws IllegalArgumentException if the value is a tensor or double, not a string
+     */
+    public Optional<String> getString(String name) {
+        Object feature = features.get(name);
+        if (feature == null) return Optional.empty();
+        if (feature instanceof String) return Optional.of((String)feature);
+        // TODO: Use toShortString for tensors below
+        throw new IllegalArgumentException("Expected a string value of '" + name + "' but has " +
+                                           (feature instanceof Tensor ? ((Tensor)feature).toString() : feature));
+    }
+
+
+    /**
      * Returns the map holding the features of this.
      * This map may be modified to change the rank features of the query.
      */