1 files changed, 30 insertions, 0 deletions
diff --git a/container-search/src/main/java/com/yahoo/search/yql/ArgumentsTypeChecker.java b/container-search/src/main/java/com/yahoo/search/yql/ArgumentsTypeChecker.java
new file mode 100644
index 00000000000..c297bf80cac
--- /dev/null
+++ b/container-search/src/main/java/com/yahoo/search/yql/ArgumentsTypeChecker.java
@@ -0,0 +1,30 @@
+// 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;
+
+import com.google.common.base.Preconditions;
+
+import java.util.List;
+
+final class ArgumentsTypeChecker {
+
+    private final Operator target;
+    private final List<OperatorTypeChecker> checkers;
+
+    public ArgumentsTypeChecker(Operator target, List<OperatorTypeChecker> checkers) {
+        this.target = target;
+        this.checkers = checkers;
+    }
+
+    public void check(Object... args) {
+        if (args == null) {
+            Preconditions.checkArgument(checkers.size() == 0, "Operator %s argument count mismatch: expected %s got 0", target, checkers.size());
+            return;
+        } else {
+            Preconditions.checkArgument(args.length == checkers.size(), "Operator %s argument count mismatch: expected: %s got %s", target, checkers.size(), args.length);
+        }
+        for (int i = 0; i < checkers.size(); ++i) {
+            checkers.get(i).check(args[i]);
+        }
+    }
+
+}