From 56a29e5254b292dc98a9496672739e97f6b159d8 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sat, 26 Mar 2016 10:59:23 +0000
Subject: Add eagerMapKeys

---
 src/main/java/org/zwobble/mammoth/internal/util/MammothMaps.java | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src/main/java/org/zwobble/mammoth/internal/util/MammothMaps.java')

diff --git a/src/main/java/org/zwobble/mammoth/internal/util/MammothMaps.java b/src/main/java/org/zwobble/mammoth/internal/util/MammothMaps.java
index 873f90c..4ca3557 100644
--- a/src/main/java/org/zwobble/mammoth/internal/util/MammothMaps.java
+++ b/src/main/java/org/zwobble/mammoth/internal/util/MammothMaps.java
@@ -56,6 +56,14 @@ public class MammothMaps {
         return map;
     }
 
+    public static <K1, K2, V> Map<K2, V> eagerMapKeys(Map<K1, V> map, Function<K1, K2> function) {
+        Map<K2, V> result = new HashMap<>();
+        for (Map.Entry<K1, V> element : map.entrySet()) {
+            result.put(function.apply(element.getKey()), element.getValue());
+        }
+        return result;
+    }
+
     public static <K, V1, V2> Map<K, V2> eagerMapValues(Map<K, V1> map, Function<V1, V2> function) {
         Map<K, V2> result = new HashMap<>();
         for (Map.Entry<K, V1> element : map.entrySet()) {
-- 
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