I have a rest service that will return List of objects
public class MyObject {
private String name;
private String state;
}
Now, I need to filter object from list based on fields provided on rest call:
http://localhost:8080/myuri?state=NY
Now, I need to develop custom filter and I did only find property filter not something like I want. Is there a way to achieve this.
You do not need to use Jackson to do this. Just filter it using Stream API. If data, are loaded from DB, filter it using SQL's WHERE clause.
Example:
@GetMapping(value = "/states", produces = MediaType.APPLICATION_JSON_VALUE)
@ResponseBody
public List<MyObject> loadStates(@RequestParam(name = "state", defaultValue = "NY", required = false) String[] states) {
return service.loadAndFilterByState(states);
}
If you have a cached list, you can filter it like below:
@GetMapping(value = "/states", produces = MediaType.APPLICATION_JSON_VALUE)
@ResponseBody
public List<MyObject> loadStates(@RequestParam(name = "state", defaultValue = "NY", required = false) String[] states) {
Arrays.sort(states);
return getStates()
.stream()
.filter(s -> Arrays.binarySearch(states, s.getState()) > -1)
.collect(Collectors.toList());
}
See also:
0 to many? Could you give me some examples? How do you store states list?http://localhost:8080/myuri or http://localhost:8080/myuri?state=NY&state=CA&state=PAList? Or do you have DB or another store for them?Java 8 Stream API?