JCBC-1588: Give TypeRef overload of JsonSerializer a default "unsupported" impl

To make it easier for the application to create a custom JsonSerializer,
provide a default implementation for the overload that takes a TypeRef.

The impetus for this change is that trying to write a custom serializer
for MessagePack required some non-trivial marshalling and casting, to
turn the TypeRef into something usable by the MessagePack Java library.

The overload is only needed if the application is using
contentAs(new TypeRef<..>{}) - which is an unusual requirement.

Change-Id: I9c084174a2b18fdde73bfee27f9729e71601dc82
Reviewed-on: http://review.couchbase.org/122259
Tested-by: Build Bot <[email protected]>
Reviewed-by: Michael Nitschinger <[email protected]>

Author: programmatix

java-client/src/main/java/com/couchbase/client/java/codec/JsonSerializer.java

@@ -16,6 +16,8 @@
 
 package com.couchbase.client.java.codec;
 
+import com.couchbase.client.core.error.DecodingFailureException;
+
 /**
  * The {@link JsonSerializer} handles the serialization and deserialization of raw json data into java objects.
  */
@@ -47,6 +49,7 @@ public interface JsonSerializer {
    * @param <T> the type to deserialize into.
    * @return the deserialized output.
    */
-  <T> T deserialize(TypeRef<T> target, byte[] input);
-
+  default <T> T deserialize(TypeRef<T> target, byte[] input) {
+    throw new DecodingFailureException(getClass().getSimpleName() + " does not support decoding via TypeRef.");
+  }
 }