Fix issue #30: Added handling for Guava's Optional de/serialization with typing.

Author: Pascal Gélinas

src/main/java/com/fasterxml/jackson/datatype/guava/deser/GuavaOptionalDeserializer.java

@@ -7,6 +7,7 @@
 import com.fasterxml.jackson.databind.DeserializationContext;
 import com.fasterxml.jackson.databind.JavaType;
 import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
+import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
 import com.google.common.base.Optional;
 
 public final class GuavaOptionalDeserializer extends StdDeserializer<Optional<?>> {
@@ -28,4 +29,10 @@ public Optional<?> deserialize(JsonParser jp, DeserializationContext ctxt) throw
         Object reference = ctxt.findRootValueDeserializer(_referenceType).deserialize(jp, ctxt);
         return Optional.of(reference);
     }
+    
+    @Override
+    public Optional<?> deserializeWithType(JsonParser jp, DeserializationContext ctxt, TypeDeserializer typeDeserializer)
+            throws IOException, JsonProcessingException {
+        return deserialize(jp, ctxt);
+    }
 }

src/main/java/com/fasterxml/jackson/datatype/guava/ser/GuavaOptionalSerializer.java

@@ -4,8 +4,10 @@
 
 import com.fasterxml.jackson.core.JsonGenerationException;
 import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.JavaType;
 import com.fasterxml.jackson.databind.SerializerProvider;
+import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
 import com.fasterxml.jackson.databind.ser.std.StdSerializer;
 import com.google.common.base.Optional;
 
@@ -23,4 +25,12 @@ public void serialize(Optional<?> value, JsonGenerator jgen, SerializerProvider
             provider.defaultSerializeNull(jgen);
         }
     }
+    
+    @Override
+    public void serializeWithType(Optional<?> value,
+                                  JsonGenerator jgen,
+                                  SerializerProvider provider,
+                                  TypeSerializer typeSer) throws IOException, JsonProcessingException {
+        serialize(value, jgen, provider);
+    }
 }