From 9cab735dfcd18e587a6bdb34303d496bec812e2d Mon Sep 17 00:00:00 2001
From: Antonin Delpeuch <antonin@delpeuch.eu>
Date: Sat, 3 Nov 2018 19:51:19 +0000
Subject: [PATCH] Add common interface for preference values

---
 .../refine/preference/PreferenceValue.java    | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 main/src/com/google/refine/preference/PreferenceValue.java

diff --git a/main/src/com/google/refine/preference/PreferenceValue.java b/main/src/com/google/refine/preference/PreferenceValue.java
new file mode 100644
index 000000000..78d8e64f2
--- /dev/null
+++ b/main/src/com/google/refine/preference/PreferenceValue.java
@@ -0,0 +1,25 @@
+package com.google.refine.preference;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+
+/**
+ * Interface to be extended by all objects stored 
+ * in the preferences. This ensures that their full class
+ * name is serialized with them. They should implement
+ * Jackson deserialization as usual.
+ * 
+ * @author Antonin Delpeuch
+ */
+
+@JsonTypeInfo(
+        use=JsonTypeInfo.Id.CLASS,
+        include=JsonTypeInfo.As.PROPERTY,
+        property="class")
+public interface PreferenceValue {
+	
+	@JsonProperty("class")
+	public default String getClassName() {
+		return this.getClass().getName();
+	}
+}