[ONOS-4718] Initial implementation of LISP address serializer

Change-Id: I71e1923f6daf1abdf2bf9798a9e421c81926a45c
diff --git a/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispSegmentLcafAddress.java b/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispSegmentLcafAddress.java
index 6f2cc22..8405695 100644
--- a/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispSegmentLcafAddress.java
+++ b/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispSegmentLcafAddress.java
@@ -18,6 +18,7 @@
 import io.netty.buffer.ByteBuf;
 import org.onosproject.lisp.msg.exceptions.LispParseError;
 import org.onosproject.lisp.msg.exceptions.LispReaderException;
+import org.onosproject.lisp.msg.exceptions.LispWriterException;
 
 import java.util.Objects;
 
@@ -212,4 +213,21 @@
                     .build();
         }
     }
+
+    /**
+     * Segment LCAF address writer class.
+     */
+    public static class SegmentLcafAddressWriter
+            implements LispAddressWriter<LispSegmentLcafAddress> {
+
+        @Override
+        public void writeTo(ByteBuf byteBuf, LispSegmentLcafAddress address)
+                throws LispWriterException {
+
+            LispLcafAddress.serializeCommon(byteBuf, address);
+
+            byteBuf.writeInt(address.getInstanceId());
+            new LispIpAddress.IpAddressWriter().writeTo(byteBuf, (LispIpAddress) address.getAddress());
+        }
+    }
 }