Livestatus\Query: some more filter-related stuff

library/Icinga/Protocol/Livestatus/Query.php

@@ -18,13 +18,24 @@ class Query extends SimpleQuery
 {
     protected $customvars = array();
 
+    /**
+     * Columns in this array are always "combined" ones creating their value
+     * based on a filter expression. The result is always either "1" or "0"
+     */
+    protected $filter_flags = array();
+
     /**
      * Columns that return arrays. Will be decoded.
      */
     protected $arrayColumns = array(
         'members' => true,
     );
 
+    /**
+     * Columns to be fetched for sorting / filtering, will not be returned
+     */
+    protected $extraFiltercolumns = array();
+
     /**
      * All available columns. To be overridden by specific query implementations
      */
@@ -47,6 +58,14 @@ public function getColumns()
         return $this->columns;
     }
 
+    /**
+     * Whether the named columns value is generated by a filter expression
+     */
+    public function isFilterFlag($column)
+    {
+        return array_key_exists($column, $this->filter_flags);
+    }
+
     /**
      * Parse the given encoded array
      *