1 files changed, 18 insertions, 0 deletions
diff --git a/modules/field/field.module b/modules/field/field.module
index 4d031e935..a4e9e4d12 100644
--- a/modules/field/field.module
+++ b/modules/field/field.module
@@ -131,6 +131,11 @@ define('FIELD_QUERY_COMPLETE', 'FIELD_QUERY_COMPLETE');
 class FieldException extends Exception {}
 
 /**
+ * Exception class thrown by hook_field_update_forbid().
+ */
+class FieldUpdateForbiddenException extends FieldException {}
+
+/**
  * Implement hook_flush_caches.
  */
 function field_flush_caches() {
@@ -611,6 +616,19 @@ function field_view_field($obj_type, $object, $field, $instance, $build_mode = '
 }
 
 /**
+ * Determine whether a field has any data.
+ *
+ * @param $field
+ *   A field structure.
+ * @return
+ *   TRUE if the field has data for any object; FALSE otherwise.
+ */
+function field_has_data($field) {
+  $results = field_attach_query($field['id'], array(), 1);
+  return !empty($results);
+}
+
+/**
  * Determine whether the user has access to a given field.
  *
  * @param $op