Pageable REST API - spring

Question

I'm using Pageable to return json results with pages. One example of my controller
#GetMapping("/nome/{nome}")
public ResponseEntity<Page<Cidadao>> consultaPorNome(
#PathVariable(value="nome",required=true) String nome,
#RequestParam(value="pagina", defaultValue="0") Integer page,
#RequestParam(value="quantidade", defaultValue="10") Integer linesPerPage,
#RequestParam(value="ordem", defaultValue="nome") String orderBy,
#RequestParam(value="direcao", defaultValue="ASC") String direction){
Page<Cidadao> lista = cidadaoService.findByNome(nome,page,linesPerPage,orderBy, direction);
return ResponseEntity.ok(lista);
}
And i get json like
{
"content": [
{
"id": 1,
"name": "Lucas"
},
{
"id": 2,
"name": "Erick"
},
],
"totalElements": 23,
"totalPages": 3,
"last": false,
"numberOfElements": 10,
"first": true,
"sort": [
{
"direction": "ASC",
"property": "nome",
"ignoreCase": false,
"nullHandling": "NATIVE",
"ascending": true,
"descending": false
}
],
"size": 10,
"number": 0
}
but i would like to return this way
{
"data":{
"content" : [
{
"id": 1,
"name": "Lucas"
},
{
"id": 1,
"name": "Lucas"
}
],
"totalElements": 23,
"totalPages": 3,
"last": false,
"numberOfElements": 10,
"first": true,
"sort": [
{
"direction": "ASC",
"property": "nome",
"ignoreCase": false,
"nullHandling": "NATIVE",
"ascending": true,
"descending": false
}
],
"size": 10,
"number": 0
},
errors:[]
}
It is possible implements anything like this to change or add attributes like errors ? Or if possible change the name attributes from Page like totalElements for numberofTotalElementBySomething.... ??

Answer 1

When I was looking for, I didn't find a beautiful solution to do this. So, I did this way:
Create a class called PageAdapter (or whatever you like)
public class PageAdapter<T extends Serializable> implements Serializable {
private long totalElements;
private long totalPages;
private long size;
private List<T> content;
public PageAdapter(Page<T> page){
this.totalElements = page.getTotalElements();
this.totalPages = page.getTotalPages();
this.size = page.getSize();
this.content = page.getContent();
}
}
And receive within constructor the original Pageable.
You can customize your properties, these properties were used in my case.
After this, you can return the PageAdapter in your controller/resource.
if there is a better solution, I would like to know too.
A suggestion for you, spring can receive an instance of Pageable, so, you don't need to receive each parameter for size, page, order and etc.
Just do this:
public ResponseEntity<Page<Cidadao>> consultaPorNome(
#PathVariable(value="nome",required=true) String nome, Pageable pageable){
You will have all information about size, page, order...
I'm not a native English speaker, so, may contains grammar errors.