Implement functions in OriginInfo class and its child element classes

src/Mods/Element/Common/BaseElement.php

@@ -12,6 +12,8 @@
 
 namespace Slub\Mods\Element\Common;
 
+use Slub\Mods\Element\Xml\Element;
+
 /**
  * MODS metadata element class for the 'php-mods-reader' library.
  *
@@ -55,7 +57,7 @@ public function getValue(): string
  /**
  * Get the string value of attribute.
  *
- * @access public
+ * @access protected
  *
  * @param string $attribute name
  *
@@ -76,7 +78,7 @@ protected function getStringAttribute($attribute): string
  /**
  * Get the int value of attribute.
  *
- * @access public
+ * @access protected
  *
  * @param string $attribute name
  *
@@ -93,4 +95,85 @@ protected function getIntAttribute($attribute): int
  }
  return 0;
  }
-}
+
+ /**
+ * Get the array of the matching elements.
+ *
+ * @access protected
+ *
+ * @param string $xpath The XPath for metadata search
+ *
+ * @return AuthorityLanguageElement[]
+ */
+ protected function getAuthorityLanguageElements(string $xpath): array
+ {
+ $elements = [];
+ $element = new Element($this->xml, $xpath);
+ if ($element->exists()) {
+ foreach ($element->getValues() as $value) {
+ $elements[] = new AuthorityLanguageElement($value);
+ }
+ }
+ return $elements;
+ }
+
+ /**
+ * Get the the array of the matching elements.
+ *
+ * @access protected
+ *
+ * @param string $xpath The XPath for metadata search
+ *
+ * @return DateElement[]
+ */
+ protected function getDateElements(string $xpath): array
+ {
+ $elements = [];
+ $element = new Element($this->xml, $xpath);
+ if ($element->exists()) {
+ foreach ($element->getValues() as $value) {
+ $elements[] = new DateElement($value);
+ }
+ }
+ return $elements;
+ }
+
+ /**
+ * Get the matching element or null if there is not match.
+ *
+ * @access protected
+ *
+ * @param string $xpath The XPath for metadata search
+ *
+ * @return ?LanguageElement
+ */
+ protected function getLanguageElement(string $xpath): ?LanguageElement
+ {
+ $element = new Element($this->xml, $xpath);
+ if ($element->exists()) {
+ return new LanguageElement($element->getValues()[0]);
+ }
+ return null;
+ }
+
+ /**
+ * Get the array of the matching elements.
+ *
+ * @access protected
+ *
+ * @param string $xpath The XPath for metadata search
+ *
+ * @return LanguageElement[]
+ */
+ protected function getLanguageElements(string $xpath): array
+ {
+ $elements = [];
+ $element = new Element($this->xml, $xpath);
+ if ($element->exists()) {
+ foreach ($element->getValues() as $value) {
+ $elements[] = new LanguageElement($value);
+ }
+ }
+ return $elements;
+ }
+}