1 files changed, 33 insertions, 0 deletions
diff --git a/container-search/src/main/java/com/yahoo/search/query/textserialize/item/ListUtil.java b/container-search/src/main/java/com/yahoo/search/query/textserialize/item/ListUtil.java
new file mode 100644
index 00000000000..9349b01a3bc
--- /dev/null
+++ b/container-search/src/main/java/com/yahoo/search/query/textserialize/item/ListUtil.java
@@ -0,0 +1,33 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.search.query.textserialize.item;
+
+import java.util.*;
+
+/**
+ * @author tonytv
+ */
+public class ListUtil {
+    public static <T> List<T> rest(List<T> list) {
+        return list.subList(1, list.size());
+    }
+
+    public static <T> T first(Collection<T> collection) {
+        return collection.iterator().next();
+    }
+
+    public static boolean firstInstanceOf(Collection<?> collection, @SuppressWarnings("rawtypes") Class c) {
+        return !collection.isEmpty() && c.isInstance(first(collection));
+    }
+
+    public static <T> List<T> butFirst(List<T> list) {
+        return list.subList(1, list.size());
+    }
+
+    public static <T> Iterable<T> butFirst(final Collection<T> collection) {
+        return () -> {
+            Iterator<T> i = collection.iterator();
+            i.next();
+            return i;
+        };
+    }
+}