Java. Cast generic List to list of objects from factory

Question

Is it possible to cast List Objects to List of Objects from Factory pattern?

I have a Jersey REST endpoint and I migrate data from one environment to another. I wish to post some list of Object and cast them to right object taken from factory pattern

@Path("/migrateTableAtOnce")
@Consumes(MediaType.APPLICATION_JSON)
public <T> Response saveObjectIntoDb(List<T> listOfObj) {

    // if listOfObj.getTableName() == "MW_ID_GENERATOR" tableOject gets new MwIdGenerator()
    myEntity tableObject = myEntityFactory.getTable(listOfObj.getTableName());


    return Response.status(201).entity("ok").build();

}

Is it possible that I have only one post method which that generic List. I have 20 objects which I need to transfer and I dont want to write 20 post methods :( I dont know how to do it exactly.

One of my method looks like that:

@POST
@Path("/migrateTableAtOnceMwIdGenerator")
@Consumes(MediaType.APPLICATION_JSON)
public Response saveObjectIntoDb(List<MwIdGenerator> listOfObj) {

    Boolean result = false;

    String dbResponse ="";
    try {
        dbResponse = obtainFacade().saveToDb(listOfObj);
        result = true;
    } catch (Exception e) {
        e.printStackTrace();
    }

    return Response.status(201).entity(result+" "+dbResponse).build();

}

Is there no better solution to solve this problem?

Answer 1

I post the body as a custom object, and have a list within that object like;

@POST
@Path("/migrateTableAtOnceMwIdGenerator")
@Consumes(MediaType.APPLICATION_JSON)
public Response saveObjectIntoDb(CustomObject object) {

    List <Stuff>list = object.getList();

and the object

public class CustomObject extends Serializable {

public List <Stuff>sList = null;
public List <OtherStuff>osList = null;
public List <TheBestStuff>tbsList = null; //etcetc

public List getList ()
{
    return list;
}

public void setList(List <Stuff>list)
{
    this.list = list;
}

public List getOsList ()
{
    return osList ;
}

public void setList(List <OtherStuff>osList)
{
    this.osList  = osList;
}

public List getTbsList  ()
{
    return tbsList;
}

public void setTbsList(List <TheBestStuff>tbsList)
{
    this.tbsList = tbsList;
}

and Jersey can parse the json object into your custom object, provided that you can pass the fields of that class as json. Seeing as you're passing the data with json, you're limited as to your implimentation as json only covers String, int, boolean and simple date, but you can pass most values as String and then parse.