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fix: Double to BigDecimal

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This commit is contained in:
Piotr Dec 2024-06-10 23:52:47 +02:00
parent b11607088a
commit f42dcce74b
Signed by: stawros
GPG key ID: F89F27AD8F881A91
15 changed files with 93 additions and 57 deletions
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1
pom.xml
View file

@ -110,6 +110,7 @@
<configuration>
<sourceDirectory>${basedir}/src/main/resources/schema</sourceDirectory>
<targetPackage>eu.ztsh.wymiana.model</targetPackage>
<useBigDecimals>true</useBigDecimals>
</configuration>
<executions>
<execution>

2
readme.md
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@ -37,7 +37,7 @@ Prosty mikroserwis stworzony na potrzeby rekrutacji
"name",
"surname",
"pesel",
"pln"
"initial"
]
}
```

4
src/main/java/eu/ztsh/wymiana/data/entity/CurrencyEntity.java
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@ -7,6 +7,8 @@ import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.math.BigDecimal;
@Data
@NoArgsConstructor
@AllArgsConstructor
@ -18,6 +20,6 @@ public class CurrencyEntity {
String pesel;
@Id
String symbol;
Double amount;
BigDecimal amount;
}

4
src/main/java/eu/ztsh/wymiana/model/Currency.java
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@ -1,5 +1,7 @@
package eu.ztsh.wymiana.model;
public record Currency(String symbol, double amount) {
import java.math.BigDecimal;
public record Currency(String symbol, BigDecimal amount) {
}

36
src/main/java/eu/ztsh/wymiana/service/CurrencyService.java
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@ -45,8 +45,8 @@ public class CurrencyService {
}
var exchanged = performExchange(from,
Optional.ofNullable(user.currencies().get(request.to().toUpperCase())).orElse(create(request.to())),
Optional.ofNullable(request.toSell()).orElse(0D),
Optional.ofNullable(request.toBuy()).orElse(0D));
Optional.ofNullable(request.toSell()).orElse(BigDecimal.ZERO),
Optional.ofNullable(request.toBuy()).orElse(BigDecimal.ZERO));
user.currencies().putAll(exchanged);
return userService.update(user);
})
@ -55,32 +55,36 @@ public class CurrencyService {
private Currency create(String symbol) {
// TODO: check if supported - now limited to PLN <-> USD
return new Currency(symbol.toUpperCase(), 0D);
return new Currency(symbol.toUpperCase(), BigDecimal.ZERO);
}
private Map<String, Currency> performExchange(Currency from, Currency to, double toSell, double toBuy) {
double exchangeRate;
double neededFromAmount;
double requestedToAmount;
private Map<String, Currency> performExchange(Currency from, Currency to, BigDecimal toSell, BigDecimal toBuy) {
BigDecimal exchangeRate;
BigDecimal neededFromAmount;
BigDecimal requestedToAmount;
if (from.symbol().equalsIgnoreCase("PLN")) {
exchangeRate = nbpService.getSellRate(to.symbol());
neededFromAmount = round(toBuy != 0 ? toBuy * exchangeRate : toSell);
requestedToAmount = round(toBuy != 0 ? toBuy : toSell / exchangeRate);
neededFromAmount = round(toBuy.signum() != 0 ? toBuy.multiply(exchangeRate) : toSell);
requestedToAmount = round(toBuy.signum() != 0 ? toBuy : divide(toSell, exchangeRate));
} else {
exchangeRate = nbpService.getBuyRate(from.symbol());
neededFromAmount = round(toBuy != 0 ? toBuy / exchangeRate : toSell);
requestedToAmount = round(toBuy != 0 ? toBuy : toSell * exchangeRate);
neededFromAmount = round(toBuy.signum() != 0 ? divide(toBuy, exchangeRate) : toSell);
requestedToAmount = round(toBuy.signum() != 0 ? toBuy : toSell.multiply(exchangeRate));
}
if (neededFromAmount > from.amount()) {
if (neededFromAmount.compareTo(from.amount()) > 0) {
throw new InsufficientFundsException();
}
var newFrom = new Currency(from.symbol(), from.amount() - neededFromAmount);
var newTo = new Currency(to.symbol(), to.amount() + requestedToAmount);
var newFrom = new Currency(from.symbol(), from.amount().subtract(neededFromAmount));
var newTo = new Currency(to.symbol(), to.amount().add(requestedToAmount));
return Stream.of(newFrom, newTo).collect(Collectors.toMap(Currency::symbol, currency -> currency));
}
private double round(double input) {
return BigDecimal.valueOf(input).setScale(2, RoundingMode.HALF_UP).doubleValue();
private BigDecimal round(BigDecimal input) {
return input.setScale(2, RoundingMode.HALF_UP);
}
private BigDecimal divide(BigDecimal input, BigDecimal division) {
return input.setScale(2, RoundingMode.HALF_UP).divide(division, RoundingMode.HALF_UP);
}
}

9
src/main/java/eu/ztsh/wymiana/service/NbpService.java
View file

@ -8,6 +8,7 @@ import org.springframework.http.HttpStatusCode;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestClient;
import java.math.BigDecimal;
import java.time.Clock;
import java.time.DayOfWeek;
import java.time.LocalDate;
@ -30,11 +31,11 @@ public class NbpService {
private final ConcurrentMap<String, RatesCache> cache = new ConcurrentHashMap<>(1);
public double getSellRate(String currency) {
public BigDecimal getSellRate(String currency) {
return getCurrency(currency.toUpperCase()).sell();
}
public double getBuyRate(String currency) {
public BigDecimal getBuyRate(String currency) {
return getCurrency(currency.toUpperCase()).buy();
}
@ -43,7 +44,7 @@ public class NbpService {
var cacheObject = cache.get(currency);
if (cacheObject == null || cacheObject.date().isBefore(today)) {
var fresh = fetchData(currency, dtf.format(today));
var rate = fresh.getRates().get(0);
var rate = fresh.getRates().getFirst();
cacheObject = new RatesCache(
LocalDate.parse(rate.getEffectiveDate(), dtf),
rate.getBid(),
@ -82,7 +83,7 @@ public class NbpService {
|| today.getDayOfWeek() == DayOfWeek.SUNDAY;
}
private record RatesCache(LocalDate date, double buy, double sell) {
private record RatesCache(LocalDate date, BigDecimal buy, BigDecimal sell) {
}

2
src/main/java/eu/ztsh/wymiana/util/UserMapper.java
View file

@ -21,7 +21,7 @@ public class UserMapper {
public static UserEntity requestToEntity(UserCreateRequest request) {
return new UserEntity(request.pesel(), request.name(), request.surname(),
List.of(new CurrencyEntity(request.pesel(), "PLN", request.pln())));
List.of(new CurrencyEntity(request.pesel(), "PLN", request.initial())));
}
private UserMapper() {

4
src/main/java/eu/ztsh/wymiana/validation/ValidExchangeRequestValidator.java
View file

@ -18,8 +18,8 @@ public class ValidExchangeRequestValidator implements
return (request.from() != null && !request.from().equals(request.to()))
&& !((request.toBuy() == null && request.toSell() == null)
|| (request.toBuy() != null && request.toSell() != null))
&& ((request.toBuy() != null && request.toBuy() >= 0)
|| (request.toSell() != null && request.toSell() >= 0));
&& ((request.toBuy() != null && request.toBuy().signum() >= 0)
|| (request.toSell() != null && request.toSell().signum() >= 0));
}
}

6
src/main/java/eu/ztsh/wymiana/web/model/CurrencyExchangeRequest.java
View file

@ -5,14 +5,16 @@ import jakarta.validation.constraints.NotNull;
import lombok.Builder;
import org.hibernate.validator.constraints.pl.PESEL;
import java.math.BigDecimal;
@Builder
@ValidExchangeRequest
public record CurrencyExchangeRequest(
@PESEL String pesel,
@NotNull String from,
@NotNull String to,
Double toBuy,
Double toSell
BigDecimal toBuy,
BigDecimal toSell
) {
}

4
src/main/java/eu/ztsh/wymiana/web/model/UserCreateRequest.java
View file

@ -6,11 +6,13 @@ import jakarta.validation.constraints.NotNull;
import lombok.Builder;
import org.hibernate.validator.constraints.pl.PESEL;
import java.math.BigDecimal;
@Builder
public record UserCreateRequest(
@NotNull String name,
@NotNull String surname,
@PESEL @Adult String pesel,
@Min(0) double pln) {
@Min(0) BigDecimal initial) {
}

50
src/test/java/eu/ztsh/wymiana/EntityCreator.java
View file

@ -9,6 +9,8 @@ import eu.ztsh.wymiana.model.User;
import eu.ztsh.wymiana.web.model.CurrencyExchangeRequest;
import eu.ztsh.wymiana.web.model.UserCreateRequest;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
@ -24,13 +26,13 @@ public class EntityCreator {
public static String ANOTHER_PESEL = "08280959342";
public static String NAME = "Janina";
public static String SURNAME = "Kowalska";
public static double PLN = 20.10;
public static double USD_SELL = 5.18;
public static double USD_BUY = 5.08;
public static BigDecimal PLN = createScaled(20.10, 2);
public static BigDecimal USD_SELL = createScaled(5.18, 2);
public static BigDecimal USD_BUY = createScaled(5.08, 2);
public static String PLN_SYMBOL = "PLN";
public static String USD_SYMBOL = "USD";
public static double BUY_RATE = 3.8804;
public static double SELL_RATE = 3.9572;
public static BigDecimal BUY_RATE = createScaled(3.8804, 4);
public static BigDecimal SELL_RATE = createScaled(3.9572, 4);
}
@ -39,25 +41,29 @@ public class EntityCreator {
}
public static User user() {
return user(Constants.PLN, 0);
return user(Constants.PLN, BigDecimal.ZERO);
}
public static User user(double pln, double usd) {
public static User user(BigDecimal pln, BigDecimal usd) {
Map<String, Currency> currencies = new HashMap<>();
if (pln > 0) {
if (pln.signum() > 0) {
currencies.put("PLN", new Currency("PLN", pln));
}
if (usd > 0) {
if (usd.signum() > 0) {
currencies.put("USD", new Currency("USD", usd));
}
return new User(Constants.NAME, Constants.SURNAME, Constants.PESEL, currencies);
}
public static UserCreateRequest.UserCreateRequestBuilder userRequest() {
return userRequest(null);
}
public static UserCreateRequest.UserCreateRequestBuilder userRequest(Double initial) {
return UserCreateRequest.builder().name(Constants.NAME)
.surname(Constants.SURNAME)
.pesel(Constants.PESEL)
.pln(Constants.PLN);
.initial(initial != null ? createScaled(initial, 2) : Constants.PLN);
}
public static CurrencyExchangeRequest.CurrencyExchangeRequestBuilder exchangeRequest() {
@ -83,8 +89,8 @@ public class EntityCreator {
String name;
String surname;
String pesel;
double pln = -1;
double usd = -1;
BigDecimal pln = BigDecimal.valueOf(-1);
BigDecimal usd = BigDecimal.valueOf(-1);
public UserEntityBuilder name(String name) {
this.name = name;
@ -102,22 +108,30 @@ public class EntityCreator {
}
public UserEntityBuilder pln(double pln) {
this.pln = pln;
return this.pln(BigDecimal.valueOf(pln));
}
public UserEntityBuilder pln(BigDecimal pln) {
this.pln = pln.setScale(2, RoundingMode.HALF_UP);
return this;
}
public UserEntityBuilder usd(double usd) {
this.usd = usd;
return this.usd(BigDecimal.valueOf(usd));
}
public UserEntityBuilder usd(BigDecimal usd) {
this.usd = usd.setScale(2, RoundingMode.HALF_UP);
return this;
}
public UserEntity build() {
var nonnulPesel = Optional.ofNullable(pesel).orElse(Constants.PESEL);
List<CurrencyEntity> currencies = new ArrayList<>();
if (pln > -1) {
if (pln.signum() > -1) {
currencies.add(new CurrencyEntity(nonnulPesel, "PLN", pln));
}
if (usd > -1) {
if (usd.signum() > -1) {
currencies.add(new CurrencyEntity(nonnulPesel, "USD", usd));
}
if (currencies.isEmpty()) {
@ -133,4 +147,8 @@ public class EntityCreator {
}
private static BigDecimal createScaled(double input, int scale) {
return BigDecimal.valueOf(input).setScale(scale, RoundingMode.HALF_UP);
}
}

14
src/test/java/eu/ztsh/wymiana/service/CurrencyServiceTest.java
View file

@ -16,6 +16,8 @@ import org.junit.jupiter.params.provider.MethodSource;
import org.mockito.Mockito;
import org.springframework.beans.factory.annotation.Autowired;
import java.math.BigDecimal;
import java.util.Objects;
import java.util.stream.Stream;
import static eu.ztsh.wymiana.EntityCreator.Constants.*;
@ -46,7 +48,7 @@ class CurrencyServiceTest extends RepositoryBasedTest {
.toSell(PLN)
.build());
assertThat(result.currencies())
.matches(map -> map.get(PLN_SYMBOL).amount() == 0 && map.get(USD_SYMBOL).amount() == USD_BUY);
.matches(map -> map.get(PLN_SYMBOL).amount().signum() == 0 && Objects.equals(map.get(USD_SYMBOL).amount(), USD_BUY), "USD 5.08");
var expected = EntityCreator.userEntity().pln(0).usd(USD_BUY).build();
expect(expected);
}
@ -62,7 +64,7 @@ class CurrencyServiceTest extends RepositoryBasedTest {
.toBuy(USD_BUY)
.build());
assertThat(result.currencies())
.matches(map -> map.get(PLN_SYMBOL).amount() == 0 && map.get(USD_SYMBOL).amount() == USD_BUY);
.matches(map -> map.get(PLN_SYMBOL).amount().signum() == 0 && Objects.equals(map.get(USD_SYMBOL).amount(), USD_BUY));
var expected = EntityCreator.userEntity().pln(0).usd(USD_BUY).build();
expect(expected);
}
@ -78,7 +80,7 @@ class CurrencyServiceTest extends RepositoryBasedTest {
.toSell(USD_SELL)
.build());
assertThat(result.currencies())
.matches(map -> map.get(PLN_SYMBOL).amount() == PLN && map.get(USD_SYMBOL).amount() == 0);
.matches(map -> Objects.equals(map.get(PLN_SYMBOL).amount(), PLN) && map.get(USD_SYMBOL).amount().signum() == 0, "PLN 20.10");
var expected = EntityCreator.userEntity().pln(PLN).usd(0).build();
expect(expected);
}
@ -94,7 +96,7 @@ class CurrencyServiceTest extends RepositoryBasedTest {
.toBuy(PLN)
.build());
assertThat(result.currencies())
.matches(map -> map.get(PLN_SYMBOL).amount() == PLN && map.get(USD_SYMBOL).amount() == 0);
.matches(map -> Objects.equals(map.get(PLN_SYMBOL).amount(), PLN) && map.get(USD_SYMBOL).amount().signum() == 0, "PLN 20.10");
var expected = EntityCreator.userEntity().pln(PLN).usd(0).build();
expect(expected);
}
@ -116,7 +118,7 @@ class CurrencyServiceTest extends RepositoryBasedTest {
@Transactional
@Test
void doubleExchangeTest() {
var initialValue = 100;
var initialValue = BigDecimal.valueOf(100);
var entity = EntityCreator.userEntity().pln(initialValue).build();
userRepository.save(entity);
var result1 = currencyService.exchange(EntityCreator.exchangeRequest()
@ -136,7 +138,7 @@ class CurrencyServiceTest extends RepositoryBasedTest {
assertThat(resultEntity.getCurrencies()
.stream()
.filter(c -> c.getSymbol().equalsIgnoreCase("PLN"))
.findFirst()).isNotEmpty().get().matches(currencyEntity -> currencyEntity.getAmount() < initialValue);
.findFirst()).isNotEmpty().get().matches(currencyEntity -> currencyEntity.getAmount().compareTo(initialValue) < 0);
}
@Transactional

3
src/test/java/eu/ztsh/wymiana/service/UserServiceTest.java
View file

@ -50,10 +50,9 @@ class UserServiceTest extends RepositoryBasedTest {
@DisplayName("Try to create another user with same PESEL")
void createDuplicatedPeselTest() {
var first = EntityCreator.userRequest().build();
var second = EntityCreator.userRequest()
var second = EntityCreator.userRequest(30.30)
.name("Jan")
.surname("Kowalski")
.pln(30.30)
.build();
userService.create(first);
assertThatThrownBy(() -> userService.create(second))

6
src/test/java/eu/ztsh/wymiana/validation/ValidExchangeRequestValidatorTest.java
View file

@ -5,6 +5,8 @@ import eu.ztsh.wymiana.web.model.CurrencyExchangeRequest;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import java.math.BigDecimal;
import static eu.ztsh.wymiana.EntityCreator.Constants.PLN_SYMBOL;
import static eu.ztsh.wymiana.EntityCreator.Constants.USD_BUY;
import static eu.ztsh.wymiana.EntityCreator.Constants.USD_SELL;
@ -72,7 +74,7 @@ class ValidExchangeRequestValidatorTest extends ValidatorTest<ValidExchangeReque
assertThatValidation(EntityCreator.exchangeRequest()
.from(PLN_SYMBOL)
.to(USD_SYMBOL)
.toBuy(-1.0)
.toBuy(BigDecimal.valueOf(-1.0))
.build()).isFalse();
}
@ -82,7 +84,7 @@ class ValidExchangeRequestValidatorTest extends ValidatorTest<ValidExchangeReque
assertThatValidation(EntityCreator.exchangeRequest()
.from(PLN_SYMBOL)
.to(USD_SYMBOL)
.toSell(-1.0)
.toSell(BigDecimal.valueOf(-1.0))
.build()).isFalse();
}

5
src/test/java/eu/ztsh/wymiana/web/ApplicationIntegrationTests.java
View file

@ -18,6 +18,7 @@ import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.ActiveProfiles;
import org.springframework.test.web.reactive.server.WebTestClient;
import java.math.BigDecimal;
import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
@ -80,7 +81,7 @@ class ApplicationIntegrationTests {
void createUserTest() {
webTestClient.post()
.uri(endpoint)
.bodyValue(EntityCreator.userRequest().pln(100).build())
.bodyValue(EntityCreator.userRequest(100D).build())
.exchange()
.expectStatus().isNoContent();
}
@ -169,7 +170,7 @@ class ApplicationIntegrationTests {
200,
asJson(EntityCreator.rates(date))
);
var expected = asJson(EntityCreator.user(100 - PLN, USD_BUY));
var expected = asJson(EntityCreator.user(BigDecimal.valueOf(100).subtract(PLN), USD_BUY));
webTestClient.post()
.uri(endpoint)
.bodyValue(EntityCreator.exchangeRequest()