Add pjson support

src/Mapper/DocumentMapper.php

@@ -3,8 +3,8 @@
 namespace BitBadger\PDODocument\Mapper;
 
 use BitBadger\PDODocument\DocumentException;
+use Exception;
 use JsonMapper;
-use JsonMapper_Exception;
 
 /**
  * Map domain class instances from JSON documents
@@ -32,12 +32,15 @@ class DocumentMapper implements Mapper
     public function map(array $result): mixed
     {
         try {
+            if (method_exists($this->className, 'fromJsonString')) {
+                return $this->className::fromJsonString($result[$this->fieldName]);
+            }
             $json = json_decode($result[$this->fieldName]);
             if (is_null($json)) {
                 throw new DocumentException("Could not map document for $this->className: " . json_last_error_msg());
             }
             return (new JsonMapper())->map($json, $this->className);
-        } catch (JsonMapper_Exception $ex) {
+        } catch (Exception $ex) {
             throw new DocumentException("Could not map document for $this->className", previous: $ex);
         }
     }