1 files changed, 45 insertions, 0 deletions
diff --git a/container-search/src/main/java/com/yahoo/prelude/fastsearch/FeatureDataField.java b/container-search/src/main/java/com/yahoo/prelude/fastsearch/FeatureDataField.java
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index 00000000000..b622f5c62c5
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+++ b/container-search/src/main/java/com/yahoo/prelude/fastsearch/FeatureDataField.java
@@ -0,0 +1,45 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.prelude.fastsearch;
+
+import com.yahoo.data.access.Inspector;
+import com.yahoo.data.access.Type;
+import com.yahoo.container.search.LegacyEmulationConfig;
+import com.yahoo.search.result.FeatureData;
+
+/**
+ * Class representing a "feature data" field.  This was historically
+ * just a string containing JSON; now it's a structure of
+ * data (that will be rendered as JSON by default).
+ */
+public class FeatureDataField extends LongstringField {
+
+    public FeatureDataField (String name) {
+        super(name);
+    }
+
+    @Override
+    public String toString() {
+        return "field " + getName() + " type FeatureDataField";
+    }
+
+    public Object convert(Inspector value) {
+        if (! value.valid()) {
+            if (getEmulConfig().stringBackedFeatureData()) {
+                return "";
+            } else if (getEmulConfig().forceFillEmptyFields()) {
+                return new FeatureData(com.yahoo.data.access.simple.Value.empty());
+            } else {
+                return null;
+            }
+        }
+        if (value.type() == Type.STRING) {
+            return value.asString();
+        }
+        FeatureData obj = new FeatureData(value);
+        if (getEmulConfig().stringBackedFeatureData()) {
+            return obj.toJson();
+        } else {
+            return obj;
+        }
+    }
+}