add field type validation

src/classes/entities/class-tainacan-item-metadata-entity.php

@@ -137,6 +137,17 @@ class Item_Metadata_Entity extends Entity {
             return false;
         }
 
+        $field_type = $field->get_field_type();
+        if( class_exists( $field_type ) ){
+            $classFieldType = new $field_type();
+            if( method_exists ( $classFieldType , 'validate' ) ){
+                if( ! $classFieldType->validate( $value ) ) {
+                    $this->add_error('field_type_error', $classFieldType->get_errors() );
+                    return false;
+                }
+            }
+        }
+        
         if ($this->is_multiple()) {
             
             if (is_array($value)) {

src/classes/entities/class-tainacan-item.php

@@ -233,4 +233,26 @@ class Item extends Entity {
 	    	}
     	}
     }
+
+    /**
+     *
+     * {@inheritDoc}
+     * @see \Tainacan\Entities\Entity::validate()
+     */
+    function validate(){
+        if( parent::validate() ){
+            $arrayItemMetadata = $this->get_fields();
+            if( $arrayItemMetadata  ){
+                foreach ( $arrayItemMetadata as $itemMetadata ) {
+                    if( !$itemMetadata->validate() ){
+                        $errors = $itemMetadata->get_errors();
+                        $this->add_error( $itemMetadata->get_field()->get_name(), $errors );
+                        return false;
+                    }
+                }
+            }
+            return true;
+        }
+        return false;
+    }
 }

src/classes/field-types/field-type/class-tainacan-field-type.php

@@ -11,6 +11,7 @@ abstract class Field_Type  {
 
     private $primitive_type;
     public $options;
+    public $errors;
 
     abstract function render( $itemMetadata );
 
@@ -39,6 +40,10 @@ abstract class Field_Type  {
         $this->primitive_type = $primitive_type;
     }
 
+    public function get_errors() {
+        return $this->errors;
+    }
+
     /**
      * @param $options
      */