classes.0 : Baseline

Duncan McGregor · dmcg · commit 0746ce247be5 · 2021-06-23T10:15:50.000+01:00
diff --git a/src/main/java/travelator/EmailAddress.java b/src/main/java/travelator/EmailAddress.java
@@ -0,0 +1,52 @@
+package travelator;
+
+import java.util.Objects;
+
+public class EmailAddress {
+    private final String localPart; // <1>
+    private final String domain;
+
+    public static EmailAddress parse(String value) { // <2>
+        var atIndex = value.lastIndexOf('@');
+        if (atIndex < 1 || atIndex == value.length() - 1)
+            throw new IllegalArgumentException(
+                "EmailAddress must be two parts separated by @"
+            );
+        return new EmailAddress(
+            value.substring(0, atIndex),
+            value.substring(atIndex + 1)
+        );
+    }
+
+    public EmailAddress(String localPart, String domain) { // <3>
+        this.localPart = localPart;
+        this.domain = domain;
+    }
+
+    public String getLocalPart() { // <4>
+        return localPart;
+    }
+
+    public String getDomain() { // <4>
+        return domain;
+    }
+
+    @Override
+    public boolean equals(Object o) { // <5>
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        EmailAddress that = (EmailAddress) o;
+        return localPart.equals(that.localPart) &&
+            domain.equals(that.domain);
+    }
+
+    @Override
+    public int hashCode() { // <5>
+        return Objects.hash(localPart, domain);
+    }
+
+    @Override
+    public String toString() { // <6>
+        return localPart + "@" + domain;
+    }
+}
diff --git a/src/main/java/travelator/Marketing.java b/src/main/java/travelator/Marketing.java
@@ -0,0 +1,8 @@
+package travelator;
+
+public class Marketing {
+
+    public static boolean isHotmailAddress(EmailAddress address) {
+        return address.getDomain().equalsIgnoreCase("hotmail.com");
+    }
+}
diff --git a/src/test/java/travelator/EmailAddressTests.java b/src/test/java/travelator/EmailAddressTests.java
@@ -0,0 +1,45 @@
+package travelator;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+public class EmailAddressTests {
+
+    @Test
+    public void parsing() {
+        assertEquals(
+            new EmailAddress("fred", "example.com"),
+            EmailAddress.parse("fred@example.com")
+        );
+    }
+
+    @Test
+    public void parsingFailures() {
+        assertThrows(
+            IllegalArgumentException.class,
+            () -> EmailAddress.parse("@")
+        );
+        assertThrows(
+            IllegalArgumentException.class,
+            () -> EmailAddress.parse("fred@")
+        );
+        assertThrows(
+            IllegalArgumentException.class,
+            () -> EmailAddress.parse("@example.com")
+        );
+        assertThrows(
+            IllegalArgumentException.class,
+            () -> EmailAddress.parse("fred_at_example.com")
+        );
+    }
+
+    @Test
+    public void parsingWithAtInLocalPart() {
+        assertEquals(
+            new EmailAddress("\"b@t\"", "example.com"),
+            EmailAddress.parse("\"b@t\"@example.com")
+        );
+    }
+}
