From 341ebf3194d7e66a4424f397ae6756b9aeb58aa9 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sun, 31 Jul 2016 19:28:41 +0100
Subject: Use only where appropriate

---
 src/main/java/org/zwobble/couscous/util/ExtraIterables.java | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'src/main/java/org/zwobble/couscous/util/ExtraIterables.java')

diff --git a/src/main/java/org/zwobble/couscous/util/ExtraIterables.java b/src/main/java/org/zwobble/couscous/util/ExtraIterables.java
index fcc13d2..3cdb031 100644
--- a/src/main/java/org/zwobble/couscous/util/ExtraIterables.java
+++ b/src/main/java/org/zwobble/couscous/util/ExtraIterables.java
@@ -211,4 +211,14 @@ public class ExtraIterables {
             return value;
         }
     }
+
+    public static <T> T only(Iterable<T> iterable, Supplier<RuntimeException> orElse) {
+        Iterator<T> iterator = iterable.iterator();
+        T value = iterator.next();
+        if (iterator.hasNext()) {
+            throw orElse.get();
+        } else {
+            return value;
+        }
+    }
 }
-- 
cgit v1.2.3