Error while getting value from MapValue.. Please help me.

[nausath ali]

Hi,
    I am trying to serialize map using messagpack.write(map). During deserialization using messagepack.read(byte[]) i got MapValue. But I cannot fetch the values using MapValue.get(key).. Look this problem below

        HashMap<Object,String> map = new HashMap<Object, String>();
        map.put(1,"ONE");
        map.put(2,"TWO");
        MessagePack m= new MessagePack();
        byte[] b = m.write(map);
      MessagePack m1 = new MessagePack();
      MapValue value = (MapValue)m1.read(b);
      System.out.println(value);// here I am getting {1:"ONE",2:"TWO"}

     System.out.println( value.get(1)); // printing the value for key 1. I am getting null.

     Please help on this.. Thanking you.
    
   Nausadh

   
 

[Muga Nishizawa]

Hi Nausadh,

MapValue type is one of abstract representation in MessagePack for
Java. MapValue is different from your "map" object. The key and value
types are Value type. You can serialize Map<Integer, String> objects
as following:

import static org.msgpack.template.Templates.TInteger;
import static org.msgpack.template.Templates.TString;
import static org.msgpack.template.Templates.tMap;

import java.util.HashMap;
import java.util.Map;

import org.msgpack.MessagePack;
import org.msgpack.template.Template;

public class Main {
public static void main(String[] args) throws Exception {
// We unrecommend that you serialize/deserialize Object types
with MessagePack.
Map<Integer,String> src = new HashMap<Integer, String>();
src.put(1,"ONE");
src.put(2,"TWO");


MessagePack msgpack = new MessagePack();
// create template object, which is serializer/deserializer
for Map<Integer, String> object.
Template<Map<Integer, String>> tmpl = tMap(TInteger, TString);

byte[] bytes = msgpack.write(src, tmpl);
Map<Integer, String> dst = msgpack.read(bytes, tmpl);

System.out.println(dst);
System.out.println(dst.get(1));
}
}

----

Thanks,
Muga

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[nausath ali]

Thanks muga,,

  But i am having a Map<Object,Object>... how can i serialize it .. Any idea?
Nausadh.ar