npalm/graphql-java-demo

Similar blocks of code found in 3 locations. Consider refactoring.
package ofouro.code.graphql.demo.service;
 
import ofouro.code.graphql.demo.model.Conference;
import org.springframework.data.domain.Example;
import org.springframework.data.domain.ExampleMatcher;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
 
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;
 
@Service
@Transactional
public class ConferenceServiceImpl implements ConferenceService {
 
    private ConferenceRepository conferenceRepository;
 
    public ConferenceServiceImpl(ConferenceRepository conferenceRepository) {
        this.conferenceRepository = conferenceRepository;
    }
 
    public List<Conference> find(final Conference filter) {
        if (filter == null) {
            return conferenceRepository.findAll();
        }
 
        ExampleMatcher matcher = ExampleMatcher.matching()
                .withStringMatcher(ExampleMatcher.StringMatcher.CONTAINING)
                .withIgnoreCase();
 
        return StreamSupport.stream(conferenceRepository.findAll(Example.of(filter, matcher)).spliterator(), false)
                .collect(Collectors.toList());
    }
 
    public Optional<Conference> findById(final Long id) {
        return conferenceRepository.findById(id);
    }
 
    public Conference save(Conference conference) {
        return this.conferenceRepository.save(conference);
    }
}