Add enum for process types in the museum

src/enums/MDValueEnumInterface.php

@@ -0,0 +1,58 @@
+<?PHP
+/**
+ * Describes an interface for a fully implemented enum describing a
+ * list of controlled values at md. Expects the availabiliy of
+ * translations for each.
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+/**
+ * Describes an interface for a fully implemented enum describing a
+ * list of controlled values at md.
+ */
+interface MDValueEnumInterface {
+    /**
+     * Returns a value of this type based on a string.
+     *
+     * @param string $input Input to get a value from.
+     *
+     * @return MDValueEnumInterface
+     */
+    public static function fromString(string $input):MDValueEnumInterface;
+
+    /**
+     * Lists the case names available.
+     *
+     * @return array<string>
+     */
+    public static function caseNames():array;
+
+    /**
+     * Gets an unsorted array based on provided keys and their translations.
+     *
+     * @param MDTlLoader $tlLoader Translation loader.
+     *
+     * @return array<string>
+     */
+    public static function getUnsortedList(MDTlLoader $tlLoader):array;
+
+    /**
+     * Gets a list of entries in a translated version.
+     *
+     * @param MDTlLoader $tlLoader Translation loader.
+     *
+     * @return array<string>
+     */
+    public static function getSortedList(MDTlLoader $tlLoader):array;
+
+    /**
+     * Returns the name of the current value in translation.
+     *
+     * @param MDTlLoader $tlLoader Translation loader.
+     *
+     * @return string
+     */
+    public function getTledName(MDTlLoader $tlLoader):string;
+}