java - Custom deserialization with Gson -

i've been trying improve code on don't know how, json this:

{    "name": "jhon", "lastname": "smith", "clothes": {     "gender":"male",     "shirt": {         "id": 113608,         "name": "green shirt",         "size": "large"     },     "pants": {         "id": 115801,         "name": "black leather pants",         "size": "large"        }     } } 

the way works far having both shirt , pants classes identical im trying use 1 class both of them.i have no in how json generated have work comes.

this classes:

class person

public class person{     private string lastname;     private string name;     private clothes clothes; } 

class clothes

public class clothes{     private shirt shirt;     private pants pants;     private string gender; } 

class shirt

public class shirt{     private string id;     private string name;     private string size; } 

pants same shirt, thing don't want code break if/when decide add piece of clothing i'm trying this

class clothes

public class clothes{     private list<something> clothlist;     private string gender; } 

instead of using 2 separate classes (shirt , pants) use 1 class - let's cloth. tried , worked fine:

person class:

package com.dominikangerer.q29550820;  public class person {     private string name;     private string lastname;     private clothes clothes; } 

clothes class:

package com.dominikangerer.q29550820;  public class clothes {     private string gender;     private cloth shirt;     private cloth pants;         } 

cloth class:

package com.dominikangerer.q29550820;  public class cloth {     private integer id;     private string name;     private string size; } 

after building these classes tried directly in little main class results in fine deserialized.

gson g = new gson(); person person = g.fromjson("{\"name\":\"jhon\",\"lastname\":\"smith\",\"clothes\":{\"gender\":\"male\",\"shirt\":{\"id\":113608,\"name\":\"green shirt\",\"size\":\"large\"},\"pants\":{\"id\":115801,\"name\":\"black leather pants\",\"size\":\"large\"}}}", person.class); 

didn't use @expose here or @serializedname("something") because wasn't needed.

hope helps out - otherwise please explain problem in more detail , try you.

----------- update ------------

okay it's quite easy cast json have there in normal object - thing inside map (clothes) have normal string value. purpose suggest enable gson functionality @expose tell why idea later.

let's start: removed clothes class map<string, object> gson can deserialize - problem here have gender inside map. modified person class works this:

person v2:

package com.dominikangerer.q29550820;  public class person {     private string name;      private string lastname;      @serializedname("clothes")     private map<string, object> clotheswrapper;      public string getgender() {         return clotheswrapper.get("gender").tostring();     }      public void setgender(string gender) {         this.clotheswrapper.put("gender", gender);     } } 

now can map gender string , modify getter , setter - still have map there contains objects. next thing don't want map<string, object> - deserializing , serialization it's totally fine - working cloths - it's stupid let's rid of easiest way:

we modify our person class this:

person v3:

package com.dominikangerer.q29550820;  public class person {     @expose     private string name;      @expose     private string lastname;      @expose     @serializedname("clothes")     private map<string, object> clotheswrapper;      private map<string, cloth> clothes;      public string getgender() {         return clotheswrapper.get("gender").tostring();     }      public void setgender(string gender) {         this.clotheswrapper.put("gender", gender);     }      public map<string, cloth> getclothes() {         if (clothes == null) {             gson g = new gson();             clothes = new hashmap<string, cloth>();             (entry<string, object> entry : clotheswrapper.entryset()) {                 if (entry.getkey().equals("gender")) {                     continue;                 }                 string helper = g.tojson(entry.getvalue());                 cloth cloth = g.fromjson(helper, cloth.class);                 clothes.put(entry.getkey(), cloth);             }         }         return clothes;     } } 

as can see indirectly cast clothes - have because it's easiest way linkedtreemap cloth-object without running classcastexception. can see have map<string,object> clotheswrapper let gson parse object (can't find better name - sorry) , map<string, cloth> clothes map without expose. need setup gson enableexpose option works this:

(using person v3 class here - debug - works charm)

public class main {     public static void main(string[] args) {         gson g = new gsonbuilder().excludefieldswithoutexposeannotation().create();         person person = g.fromjson("{\"name\":\"jhon\",\"lastname\":\"smith\",\"clothes\":{\"gender\":\"male\",\"shirt\":{\"id\":113608,\"name\":\"green shirt\",\"size\":\"large\"},\"pants\":{\"id\":115801,\"name\":\"black leather pants\",\"size\":\"large\"}}}", person.class);         system.out.println(person.getclothes());         system.out.println(person.getgender());     } } 

you can find classes in github repository