Question

I have data from a ResultSet that contains three fields: DataType, Data, DataValue. I want to build a Java Collection, and next build the JSON encode.

This is the output when I try to print:

System.out.println(resultSet.getString("DATATYPE") + " --> " + resultSet.getString("DATA") + " --> " + resultSet.getString("DATAVALUE"));

Output:

Address --> Test --> JHGJHGJKG
Address --> City--> Some city
Address --> State --> Some state
Address --> Downtown --> Some downtown
Address --> Telephone --> 547455654
Address --> Street  --> Some street
Customer Information --> Downtown --> some other downtown
Customer Information --> Job --> Programmer
Customer Information --> Identification card --> ID32443
Customer Information --> ZIP Code --> 74584
Customer Information --> Kind of person --> Regular
Customer Information --> Birthday --> 10 01 1980
Customer Information --> Telephone --> 99832498
Other --> Last visit --> 10 01 1980

I attemped with Guava Google Collections like this:

Map<String, String> data = new HashMap<String,String>();
HashMultimap<String, Map> multiMap = HashMultimap.<String, Map> create();
...
//iterating the resultSet
..

data.put(resultSet.getString("DATA"), resultSet.getString("DATAVALUE"));
multiMap.put(resultSet.getString("DATATYPE"), data);
..
// resultSet ends

The the resulting Collection/Multimap would be:

{
  [
    Address = {
      Test = somevalue,
      City = SomeCity,
      ...
    },
    Customer Information={
      Job = programer,
      Identificationcard = ID34234,
      ...
    },
    Other{
      Lastvisit = 10-02-1990
    }
  ]
}

I’ve tried, but no successful results.

All the results from ResultSet are dynamically, dynamic type, data and value. I can’t use definided classes, for example for an Address data, based on the input data could not be shown.

Answer 1

You can have a generic domain object like this:

Dataobject {

   dataType;
   data;
   dataValue;

   Set<Dataobject>descendents;

}

That will give you the endless depth of chaining.

while you iterate the resultset, you can decide whether you want to create them at the same level or increasing depth.

after all that is done, use XStream() to marshall it into an xml string.