1 files changed, 19 insertions, 0 deletions
diff --git a/container-search/src/main/java/com/yahoo/search/yql/OperatorTypeChecker.java b/container-search/src/main/java/com/yahoo/search/yql/OperatorTypeChecker.java
new file mode 100644
index 00000000000..8266f414fa7
--- /dev/null
+++ b/container-search/src/main/java/com/yahoo/search/yql/OperatorTypeChecker.java
@@ -0,0 +1,19 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.search.yql;
+
+/**
+ * Check the type of a single argument.
+ */
+abstract class OperatorTypeChecker {
+
+    protected final Operator parent;
+    protected final int idx;
+
+    protected OperatorTypeChecker(Operator parent, int idx) {
+        this.parent = parent;
+        this.idx = idx;
+    }
+
+    public abstract void check(Object argument);
+
+}