Add default implementation of Renderer.encode to AbstractRenderer (#13334)

Change-Id: I74a0960bbe56e71702762e4cf1067098dd428125

1 files changed, 27 insertions, 0 deletions

diff --git a/server/src/com/vaadin/ui/components/grid/AbstractRenderer.java b/server/src/com/vaadin/ui/components/grid/AbstractRenderer.java
index d1cf77c24b..a0eea891e7 100644
--- a/server/src/com/vaadin/ui/components/grid/AbstractRenderer.java
+++ b/server/src/com/vaadin/ui/components/grid/AbstractRenderer.java
@@ -17,6 +17,9 @@ package com.vaadin.ui.components.grid;
 
 import com.vaadin.server.AbstractClientConnector;
 import com.vaadin.server.AbstractExtension;
+import com.vaadin.server.JsonCodec;
+
+import elemental.json.JsonValue;
 
 /**
  * An abstract base class for server-side Grid renderers.
@@ -65,6 +68,30 @@ public abstract class AbstractRenderer<T> extends AbstractExtension implements
         return presentationType;
     }
 
+    @Override
+    public JsonValue encode(T value) {
+        return JsonCodec.encode(doEncode(value), null, getPresentationType(),
+                getUI().getConnectorTracker()).getEncodedValue();
+    }
+
+    /**
+     * Encodes the given value to an intermediate representation that can be
+     * serialized to JSON by Vaadin. The default implementation simply returns
+     * the value as is.
+     * <p>
+     * This is a helper method intended to be overridden if the value must be
+     * processed somehow but doing the JSON serialization manually is not
+     * desired. For instance, a {@code Renderer<Date>} could return a formatted
+     * string from {@code doEncode}.
+     * 
+     * @param value
+     *            the value to be encoded
+     * @return a value that can be serialized by Vaadin
+     */
+    protected Object doEncode(T value) {
+        return value;
+    }
+
     /**
      * Gets the item id for a row key.
      * <p>