java - Gson custom deserializer for generic types -

i have number of classes implement single interface type. want write custom deserializer able handle special case json have deserialize. possible google gson? here sample code have far:

class type:

public class myclass implements myinterface {    ....... } 

deserializer

public class responsedeserializer implements jsondeserializer<myinterface> {      private gson fgson;      public responsedeserializer()     {         fgson = new gson();     }      @override     public myinterface deserialize(jsonelement json, type typeoft, jsondeserializationcontext context) throws jsonparseexception      {         string jsonstring = json.tostring();          if(jsonstring.substring(0, 0).equals("["))         {             jsonstring = "{ \"parameter\":" + jsonstring + "}";         }         return context.deserialize(json, typeoft);     }    } 

register , call fromjson method:

@override public <t extends myinterface> t createresponse(class<t> responsetype) {     t returnobject = new gsonbuilder().registertypeadapter(myinterface.class, new responsedeserializer())             .create().fromjson(getentitytext(), responsetype);     return returnobject; } 

thanks in advance

first of all, registertypeadapter() not covariant; if want link typeadapter interface, have use typeadapterfactory. see: how implement typeadapterfactory in gson?

secondly, why think [{...},{...},{...}] not valid json? of course is:

{      "foo":[         {            "type":"bar"       },       {            "type":"baz"       }    ] } 

this mapping of key foo array of objects, 1 member variable. gson automatically deserialize following pojos:

public class myobject {     list<typedobject> foo; }  public class typedobject {     string type; } 

beyond that, can't more without knowing specific json string. (especially first link) should enough started, however.