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Adição de validador agência bancária (#301)
* Adicao de validador de agencia bancaria * Remocao do uso de Objects disponivel a partir do Java 7
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‎stella-core/src/main/java/br/com/caelum/stella/validation/AgenciaBancariaValidator.java

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package br.com.caelum.stella.validation;
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import br.com.caelum.stella.DigitoGenerator;
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import br.com.caelum.stella.MessageProducer;
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import br.com.caelum.stella.SimpleMessageProducer;
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import br.com.caelum.stella.ValidationMessage;
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import br.com.caelum.stella.validation.error.AgenciaBancariaError;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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/**
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* Representa um validador de agencia bancária.
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*
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* @author Thiago Nascimento
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*/
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public class AgenciaBancariaValidator implements Validator<String> {
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public static final Pattern COM_DV = Pattern.compile("(\\d+)\\-([\\dX])");
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public static final Pattern SEM_DV = Pattern.compile("\\d+");
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private boolean isComDigito = true;
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private MessageProducer messageProducer;
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public AgenciaBancariaValidator() {
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this.messageProducer = new SimpleMessageProducer();
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}
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public AgenciaBancariaValidator(boolean isComDigito) {
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this();
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this.isComDigito = isComDigito;
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}
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@Override
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public void assertValid(String agencia) {
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List<ValidationMessage> errors = this.invalidMessagesFor(agencia);
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if (!errors.isEmpty()) {
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throw new InvalidStateException(errors);
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}
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}
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@Override
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public List<ValidationMessage> invalidMessagesFor(String agencia) {
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List<ValidationMessage> errors = new ArrayList<ValidationMessage>();
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if (this.isEligible(agencia)) {
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if (this.isComDigito) {
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Matcher matcher = COM_DV.matcher(agencia);
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if (!matcher.find()) {
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throw new InvalidStateException(this.messageProducer.getMessage(AgenciaBancariaError.INVALID_FORMAT));
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}
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String dvInformado = matcher.group(2);
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String dvComputado = this.computarDigitoVerificador(matcher.group(1));
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if (!dvInformado.equals(dvComputado)) {
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errors.add(this.messageProducer.getMessage(AgenciaBancariaError.INVALID_CHECK_DIGIT));
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}
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} else {
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errors.add(this.messageProducer.getMessage(AgenciaBancariaError.CHECK_DIGIT_NOT_FOUND));
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}
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} else {
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errors.add(this.messageProducer.getMessage(AgenciaBancariaError.INVALID_FORMAT));
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}
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return errors;
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}
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@Override
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public boolean isEligible(String value) {
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if (value == null || value.trim().isEmpty()) {
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return false;
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}
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return this.isComDigito ?
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COM_DV.matcher(value).matches() : SEM_DV.matcher(value).matches();
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}
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@Override
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public String generateRandomValid() {
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final String agenciaSemDigitos = new DigitoGenerator().generate(4);
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return String.format("%s-%s", agenciaSemDigitos, this.computarDigitoVerificador(agenciaSemDigitos));
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}
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public String computarDigitoVerificador(String agenciaSemDV) {
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String[] algarisms = agenciaSemDV.split("");
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int multiplier = 9;
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int sum = 0;
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for (int index = algarisms.length - 1; index >= 0; --index) {
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sum += Integer.valueOf(algarisms[index]) * multiplier--;
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}
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int rest = sum % 11;
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return rest == 10 ? "X" : String.valueOf(rest);
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}
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}

‎stella-core/src/main/java/br/com/caelum/stella/validation/error/AgenciaBancariaError.java

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package br.com.caelum.stella.validation.error;
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import br.com.caelum.stella.validation.InvalidValue;
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public enum AgenciaBancariaError implements InvalidValue {
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INVALID_CHECK_DIGIT, CHECK_DIGIT_NOT_FOUND, INVALID_FORMAT
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}

‎stella-core/src/test/java/br/com/caelum/stella/validation/AgenciaBancariaValidatorTest.java

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package br.com.caelum.stella.validation;
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import static org.junit.Assert.assertFalse;
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import static org.junit.Assert.assertTrue;
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import static org.junit.Assert.fail;
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import org.junit.Test;
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import br.com.caelum.stella.MessageProducer;
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import br.com.caelum.stella.SimpleMessageProducer;
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import br.com.caelum.stella.validation.error.AgenciaBancariaError;
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/**
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* @author Thiago Nascimento
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*/
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public class AgenciaBancariaValidatorTest {
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private MessageProducer messageProducer = new SimpleMessageProducer();
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@Test
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public void shouldAcceptEligibleAgenciasComDV() {
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AgenciaBancariaValidator validator = new AgenciaBancariaValidator();
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assertTrue(validator.isEligible("3610-2"));
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assertFalse(validator.isEligible("3610"));
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}
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@Test
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public void shouldAcceptEligibleAgenciasSemDV() {
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AgenciaBancariaValidator validator = new AgenciaBancariaValidator(false);
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assertFalse(validator.isEligible("3610-2"));
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assertTrue(validator.isEligible("3610"));
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}
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@Test
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public void shouldReturnNoValidationMessagesForCorrectAgenciasComDV() {
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AgenciaBancariaValidator validator = new AgenciaBancariaValidator();
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assertTrue(validator.invalidMessagesFor("3610-2").isEmpty());
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assertTrue(validator.invalidMessagesFor("3793-1").isEmpty());
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assertTrue(validator.invalidMessagesFor("197-X").isEmpty());
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assertTrue(validator.invalidMessagesFor("4158-0").isEmpty());
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assertTrue(validator.invalidMessagesFor("2121-0").isEmpty());
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assertTrue(validator.invalidMessagesFor("1284-X").isEmpty());
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}
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@Test
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public void shouldReturnInvalidCheckDigitForIncorrectDV() {
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AgenciaBancariaValidator validator = new AgenciaBancariaValidator();
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try {
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validator.assertValid("2121-9");
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fail();
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} catch (InvalidStateException e) {
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e.getInvalidMessages().contains(this.messageProducer.getMessage(AgenciaBancariaError.INVALID_CHECK_DIGIT));
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}
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}
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@Test
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public void shouldReturnCheckDigitNotFoundForAgenciaSemDV() {
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AgenciaBancariaValidator validator = new AgenciaBancariaValidator();
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try {
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validator.assertValid("1103");
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fail();
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} catch (InvalidStateException e) {
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e.getInvalidMessages().contains(this.messageProducer.getMessage(AgenciaBancariaError.CHECK_DIGIT_NOT_FOUND));
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}
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}
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}

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