Faz validação de constraints

CheckConstraint.java

	@SuppressWarnings("unused")
	private void checkConstraints(T entity, boolean isUpdate) {
		List<Field> fields = mirror.on(entity.getClass()).reflectAll().fields();

		List<Field> uniqueFields = onlyUniqueColumns(fields);
		if (uniqueFields.size() != 0) {
			validateConstraints(entity, isUpdate, mirror, uniqueFields);
		}			
	}

	private void validateConstraints(T entity, boolean isUpdate, Mirror mirror,
			List<Field> uniqueFields) {
		Criteria criteria = session.createCriteria(entity.getClass());
		Conjunction conjunction = Restrictions.conjunction();
		if (isUpdate) {
			conjunction.add(Restrictions.ne("id", mirror.on(entity).get().field("id")));
		}
		
		for (Field field : uniqueFields) {
			conjunction.add(Restrictions.eq(field.getName(), mirror.on(entity).get().field(field)));
		}
		
		if (criteria.add(conjunction).list().size() != 0)
		{
			throw new org.hibernate.exception.ConstraintViolationException("could not insert: " + entity.getClass().getName(), new SQLException(), "");
		}
	}

	private List<Field> onlyUniqueColumns(List<Field> fields) {
		List<Field> uniqueFields = new ArrayList<Field>();
		for (Field field : fields) {
			if (field.isAnnotationPresent(Column.class)) {
				addUniqueField(uniqueFields, field);
			}
		}
		return uniqueFields;
	}

	private void addUniqueField(List<Field> uniqueFields, Field field) {
		Column column = field.getAnnotation(Column.class);
		if (column.unique()) {
			uniqueFields.add(field);
		}
	}