Reorganize exceptions structure

src/Exception/CurrencyConversionException.php

@@ -7,7 +7,7 @@
 /**
  * Exception thrown when an exchange rate is not available.
  */
-class CurrencyConversionException extends MoneyException
+class CurrencyConversionException extends \RuntimeException implements MoneyException
 {
     /**
      * @var string

src/Exception/MoneyException.php

@@ -5,8 +5,8 @@
 namespace Brick\Money\Exception;
 
 /**
- * Base class for money exceptions.
+ * Interface for money exceptions.
  */
-abstract class MoneyException extends \Exception
+interface MoneyException extends \Throwable
 {
 }

src/Exception/MoneyMismatchException.php

@@ -9,7 +9,7 @@
 /**
  * Exception thrown when a money is not in the expected currency or context.
  */
-class MoneyMismatchException extends MoneyException
+class MoneyMismatchException extends \DomainException implements MoneyException
 {
     /**
      * @param Currency $expected

src/Exception/UnknownCurrencyException.php

@@ -1,42 +1,42 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Brick\Money\Exception;
-
-/**
- * Exception thrown when attempting to create a Currency from an unknown currency code.
- */
-class UnknownCurrencyException extends MoneyException
-{
-    /**
-     * @param string|int $currencyCode
-     *
-     * @return UnknownCurrencyException
-     */
-    public static function unknownCurrency($currencyCode) : self
-    {
-        return new self('Unknown currency code: ' . $currencyCode);
-    }
-
-    /**
-     * @param string $countryCode
-     *
-     * @return UnknownCurrencyException
-     */
-    public static function noCurrencyForCountry(string $countryCode) : self
-    {
-        return new self('No currency found for country ' . $countryCode);
-    }
-
-    /**
-     * @param string $countryCode
-     * @param array  $currencyCodes
-     *
-     * @return UnknownCurrencyException
-     */
-    public static function noSingleCurrencyForCountry(string $countryCode, array $currencyCodes) : self
-    {
-        return new self('No single currency for country ' . $countryCode . ': ' . implode(', ', $currencyCodes));
-    }
-}
+<?php
+
+declare(strict_types=1);
+
+namespace Brick\Money\Exception;
+
+/**
+ * Exception thrown when attempting to create a Currency from an unknown currency code.
+ */
+class UnknownCurrencyException extends \DomainException implements MoneyException
+{
+    /**
+     * @param string|int $currencyCode
+     *
+     * @return UnknownCurrencyException
+     */
+    public static function unknownCurrency($currencyCode) : self
+    {
+        return new self('Unknown currency code: ' . $currencyCode);
+    }
+
+    /**
+     * @param string $countryCode
+     *
+     * @return UnknownCurrencyException
+     */
+    public static function noCurrencyForCountry(string $countryCode) : self
+    {
+        return new self('No currency found for country ' . $countryCode);
+    }
+
+    /**
+     * @param string $countryCode
+     * @param array  $currencyCodes
+     *
+     * @return UnknownCurrencyException
+     */
+    public static function noSingleCurrencyForCountry(string $countryCode, array $currencyCodes) : self
+    {
+        return new self('No single currency for country ' . $countryCode . ': ' . implode(', ', $currencyCodes));
+    }
+}