return dynamic value in java REST / Spring / Hibernate -


i've inherited rest api using jboss, spring, hibernate, etc. , i'm new these please forgive seems dumb question (to me).

the basic flow when performing build entity list add modelandview object return it.

question: how can add calculated value response?

i don't want store calculated values in database, nor want add member each entity being returned (ie arraylist<athletes> , add "points behind leader" member athletes class). want perform calculation on each request , append member json response dynamic value so: 

{ "athlete1" : {"name" : "bob", "somedynamicvalue" : "124548412" } }

seems relatively common can't seem find simple solution.....maybe i'm not sure how ask question correctly.

any appreciated.

ps - thought me returning entities in rest api spring answer never addressed questions, how add dynamic values response.

edit: per request here's simplified code 

public modelandview getathletes(httpservletrequest req, httpservletresponse res)      throws webserviceexception {          res.setcontenttype("text/xml");          list<athletestat> athletestats = athletemanager.getathletestats();           map<string, object> model = new hashmap<string, object>();           model.put("athletestats", athletestats);          modelandview modelandview = new modelandview("athletes.ftl", "model", model);         modelandview.setcacheable(true);          return modelandview;              }     public class athletestat{      private long id;     private string name;     private string hometown;         private string resides;     private date birthdate;      //getters , setters  }    <?xml version="1.0" encoding="utf-8" standalone="yes" ?> <#escape x x?xml> <response status="ok">     <data>               <athletes>         <#list model.athletestats athletestat>             <athlete name="${athletestat.athlete.name}" internalid="${athletestat.athlete.id?c}">                 <abbrevname><#if athletestat.athlete.abbrevname?exists>${athletestat.athlete.abbrevname}</#if></abbrevname>                 <birthdate><#if athletestat.athlete.birthdate?exists>${athletestat.athlete.birthdate?string("yyyy-mm-dd't'hh:mm:ss")}</#if></birthdate>                 <hometown><#if athletestat.athlete.hometown?exists>${athletestat.athlete.hometown}</#if></hometown>                 <resides><#if athletestat.athlete.resides?exists>${athletestat.athlete.resides}</#if></resides>                 <age><#if athletestat.athlete.age?exists>${athletestat.athlete.age}</#if></age>             </athlete>         </#list>         </athletes>     </data> </response> </#escape>

you can put in model additional map map dynamic values each athlete.

like this: have

model.put("athletestats", athletestats);

add generation of dynamic value map , add model:

model.put("athletestats", athletestats); map<integer, string> dynamicvalues = new hashmap<integer, string>(); for(athletestat athletestat : athletestats) {    string dynvalue = athletestat.tostring(); /* calculate dynamic value */    dynamicvalues.put(athletestat.getid(), dynvalue); } model.put("dynamicvalues", dynamicvalues);

now add line map it:

<dynamic>     <#if model.dynamicvalues.get(athletestat.athlete.id)?exists>         ${model.dynamicvalues.get(athletestat.athlete.id)}     </#if> </dynamic>

like:

...         <age><#if athletestat.athlete.age?exists>${athletestat.athlete.age}</#if></age>         <dynamic><#if model.dynamicvalues.get(athletestat.athlete.id)?exists>${model.dynamicvalues.get(athletestat.athlete.id)}</#if></dynamic>     </athlete> </#list>

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