feat: POJO mappers

src/main/java/eu/ztsh/wymiana/util/CurrencyMapper.java

@@ -0,0 +1,24 @@
+package eu.ztsh.wymiana.util;
+
+import eu.ztsh.wymiana.data.entity.CurrencyEntity;
+import eu.ztsh.wymiana.model.Currency;
+
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+public class CurrencyMapper {
+
+    public static Currency entityToPojo(CurrencyEntity entity) {
+        return new Currency(entity.getSymbol(), entity.getAmount());
+    }
+
+    public static Map<String, Currency> entitiesToPojoMap(List<CurrencyEntity> values) {
+        return values.stream().map(CurrencyMapper::entityToPojo)
+            .collect(Collectors.toMap(Currency::symbol, pojo -> pojo));
+    }
+
+    private CurrencyMapper() {
+    }
+
+}

src/main/java/eu/ztsh/wymiana/util/UserMapper.java

@@ -0,0 +1,16 @@
+package eu.ztsh.wymiana.util;
+
+import eu.ztsh.wymiana.data.entity.UserEntity;
+import eu.ztsh.wymiana.model.User;
+
+public class UserMapper {
+
+    public static User entityToPojo(UserEntity entity) {
+        return new User(entity.getName(), entity.getSurname(), entity.getPesel(),
+            CurrencyMapper.entitiesToPojoMap(entity.getCurrencies()));
+    }
+
+    private UserMapper() {
+    }
+
+}