Add class MDConcObjectTagRelTypes for mapping strings to object-tag

relation types

src/MDConcObjectTagRelTypes.php

@@ -0,0 +1,49 @@
+<?PHP
+/**
+ * Constains lists for categorizing links between objects and tags.
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+/**
+ * Constains lists for categorizing links between objects and tags.
+ */
+final class MDConcObjectTagRelTypes implements MDImporterConcordanceListInterface {
+
+    private const RELATION_TYPE_NAMES = [
+
+        '' => 'tag',
+        'tag' => 'tag',
+
+        "motive" => "article",
+        "motiv" => "article",
+        "display" => "display_subject",
+
+        "material" => "material",
+
+        "technique" => "technique",
+        "technik" => "technique",
+
+    ];
+
+    /**
+     * Require a function for getting the concordance target.
+     *
+     * @param string $input Input string.
+     *
+     * @return string
+     */
+    public static function getConcordanceTarget(string $input):string {
+
+        if (isset(self::RELATION_TYPE_NAMES[$input])) {
+            return self::RELATION_TYPE_NAMES[$input];
+        }
+        if (isset(self::RELATION_TYPE_NAMES[strtolower($input)])) {
+            return self::RELATION_TYPE_NAMES[strtolower($input)];
+        }
+
+        throw new MDImporterMissingConcordance("Unknown object-tag relationship type: " . $input);
+
+    }
+}