[PHP] [User Modelling Example] Added some logic to the different Value Objects to illustrate the "logic magnet" concept

Author: JavierCane

examples/php/php-user_modelling-02_value_objects/src/Age.php

@@ -4,6 +4,8 @@
 
 namespace CodelyTv\UserModelling;
 
+use InvalidArgumentException;
+
 final class Age
 {
     private const UNDERAGE_UNTIL_AGE = 18;
@@ -12,6 +14,10 @@ final class Age
 
     public function __construct(int $value)
     {
+        if ($value < 10) {
+            throw new InvalidArgumentException("User too young");
+        }
+
         $this->value = $value;
     }
 

examples/php/php-user_modelling-02_value_objects/src/Locale.php

@@ -4,26 +4,33 @@
 
 namespace CodelyTv\UserModelling;
 
+use InvalidArgumentException;
+
 final class Locale
 {
+    private const VALID_LOCALE_PATTERN = '/([a-z]{2})_([A-Z]{2})$/';
     private const SPANISH_LANGUAGE = "es";
 
-    private string $value;
+    private string $languageCode;
+    private string $countryCode;
 
     public function __construct(string $value)
     {
-        $this->value = $value;
+        if (!preg_match(self::VALID_LOCALE_PATTERN, $value, $matches)) {
+            throw new InvalidArgumentException("Invalid locale");
+        }
+
+        $this->languageCode = $matches[1];
+        $this->countryCode  = $matches[2];
     }
 
     public function value(): string
     {
-        return $this->value;
+        return $this->languageCode . '_' . $this->countryCode;
     }
 
     public function understandSpanish(): bool
     {
-        $language = substr($this->value, 0, 2);
-
-        return $language === self::SPANISH_LANGUAGE;
+        return $this->languageCode === self::SPANISH_LANGUAGE;
     }
 }