Android/app/src/main/java/com/moiseum/wolnelektury/storage/StringListConverter.java

   1 package com.moiseum.wolnelektury.storage;
   2
   3 import java.util.ArrayList;
   4 import java.util.Arrays;
   5 import java.util.List;
   6
   7 import io.objectbox.converter.PropertyConverter;
   8
   9 /**
  10  * Created by Piotr Ostrowski on 01.07.2018.
  11  */
  12 public class StringListConverter implements PropertyConverter<List<String>, String> {
  13
  14         @Override
  15         public List<String> convertToEntityProperty(String databaseValue) {
  16                 if (databaseValue == null) {
  17                         return new ArrayList<>();
  18                 }
  19                 return Arrays.asList(databaseValue.split(","));
  20         }
  21
  22         @Override
  23         public String convertToDatabaseValue(List<String> entityProperty) {
  24                 if (entityProperty == null) {
  25                         return "";
  26                 }
  27                 if (entityProperty.isEmpty()) {
  28                         return "";
  29                 }
  30                 StringBuilder builder = new StringBuilder();
  31                 for (String property : entityProperty) {
  32                         builder.append(property).append(",");
  33                 }
  34                 builder.deleteCharAt(builder.length() - 1);
  35                 return builder.toString();
  36         }
  37 }