first commit

batch/models/query/query_factory.js

@@ -0,0 +1,16 @@
+'use strict';
+
+var QueryFallback = require('./query_fallback');
+
+function QueryFactory() {
+}
+
+module.exports = QueryFactory;
+
+QueryFactory.create = function (job, index) {
+    if (QueryFallback.is(job.query.query[index])) {
+        return new QueryFallback(job, index);
+    }
+
+    throw new Error('there is no query class for the provided query');
+};