* Added JsonSerialize to the Flow-related containers.
* Implement the remaining toString() methods that were
returning empty strings.
diff --git a/src/main/java/net/floodlightcontroller/util/serializers/DpidSerializer.java b/src/main/java/net/floodlightcontroller/util/serializers/DpidSerializer.java
new file mode 100644
index 0000000..2b71690
--- /dev/null
+++ b/src/main/java/net/floodlightcontroller/util/serializers/DpidSerializer.java
@@ -0,0 +1,23 @@
+package net.floodlightcontroller.util.serializers;
+
+import java.io.IOException;
+
+import org.codehaus.jackson.JsonGenerator;
+import org.codehaus.jackson.JsonProcessingException;
+import org.codehaus.jackson.map.JsonSerializer;
+import org.codehaus.jackson.map.SerializerProvider;
+
+import net.floodlightcontroller.util.Dpid;
+
+/**
+ * Serialize a DPID as a string.
+ */
+public class DpidSerializer extends JsonSerializer<Dpid> {
+
+ @Override
+ public void serialize(Dpid dpid, JsonGenerator jGen,
+ SerializerProvider serializer)
+ throws IOException, JsonProcessingException {
+ jGen.writeString(dpid.toString());
+ }
+}