Spring Boot - GET atributes in common from repository jpa - spring

Question

I started working with spring boot's rest API and ended up having some specific problems returning the last two topics
1- GET animals/number/{number}
You should list the animals with the number/code {number}
2- GET animals/name/{name}
You should list the animals with the name {name}
3- GET animals/species/{species}
You should list the animalsof the species {species}. Note, more than one animal can be returned for each species.
4- GET animals /type/{type}
You should list the animals of the type {type}. Note, more than one animal can be returned for each type. Due to the nature of this field, you should perform a substring search. For example, the value “poison” for the {type} should return the animals with the type "reptile/Poison".
what I got
#RequestMapping(value="/animals/number/{number}", method=RequestMethod.GET)
public ResponseEntity<?> getNumber(#PathVariable(name = "number") String number) {
Optional<Animal> o = repository.findByNumber(number);
if (!o.isPresent())
return new ResponseEntity<>(o, HttpStatus.NOT_FOUND);
return new ResponseEntity<>(o, HttpStatus.FOUND);
}
#RequestMapping(value="/animals/name/{name}", method=RequestMethod.GET)
public ResponseEntity<?> getName(#PathVariable(name = "name") String name) {
Optional<Animal> o = repository.findByName(name);
if (!o.isPresent())
return new ResponseEntity<>(o, HttpStatus.NOT_FOUND);
return new ResponseEntity<>(o, HttpStatus.FOUND);
}
I tried to do topic 3 but I'm not able to:
#RequestMapping(value="/animals/species/{species}", method=RequestMethod.GET)
public ResponseEntity<?> getSpecies(#PathVariable(name = "species") String species) {
List<Animal> p = repository.findAll();
if (species == null)
repository.findAll().forEach(p::contains);
else
repository.findByTitleContaining(species).forEach(p::contains);
if (p.isEmpty()) {
return new ResponseEntity<>(HttpStatus.NO_CONTENT);
}
return new ResponseEntity<>(p, HttpStatus.OK);
}
#Repository
public interface AnimalRepository extends JpaRepository<Animal, Integer> {
Optional<Animal> findByNumber(String number);
Optional<Animal> findByName(String name);
Optional<Animal> findByspecie(String species);
}
i put for test //localhost:8081/animals/name/Animalname

Answer 1

You can query all animals matching the searched specie using a Spring Data generated query (as the one you seem to have defined):
List<Animal> findByTitleContaining(String specie);
Then you can group the returned elements using the java.util.stream.Collectors#groupingBy using the Animal types:
#RequestMapping(value="/animals/species/{species}", method=RequestMethod.GET)
public ResponseEntity<?> getSpecies(#PathVariable(name = "species") String species) {
List<Animal> matchingAnimals = repository.findByTitleContaining(species);
if (!matchingAnimals.isEmpty()) {
final Map<String, List<Animal>> groupedAnimals = matchingAnimals.stream()
.collect(Collectors.groupingBy(Animal::getType));
return new ResponseEntity<>(groupedAnimals, HttpStatus.OK);
} else {
return new ResponseEntity<>(HttpStatus.NO_CONTENT);
}
}