Java tutorial
/* StringToCustomerConverter.java * * Copyright (C) 2016 Universidad de Sevilla * * The use of this project is hereby constrained to the conditions of the * TDG Licence, a copy of which you may download from * http://www.tdg-seville.info/License.html * */ package converters; import org.apache.commons.lang.StringUtils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.core.convert.converter.Converter; import org.springframework.stereotype.Component; import org.springframework.transaction.annotation.Transactional; import domain.Quiver; import repositories.QuiverRepository; @Component @Transactional public class StringToQuiverConverter implements Converter<String, Quiver> { @Autowired QuiverRepository quiverRepository; @Override public Quiver convert(String text) { Quiver result; int id; try { if (StringUtils.isEmpty(text)) result = null; else { id = Integer.valueOf(text); result = quiverRepository.findOne(id); } } catch (Throwable oops) { throw new IllegalArgumentException(oops); } return result; } }