Split ConcreteType up into specialised type implementations

1 files changed, 5 insertions, 0 deletions

diff --git a/src/main/java/org/zwobble/couscous/util/ExtraMaps.java b/src/main/java/org/zwobble/couscous/util/ExtraMaps.java
index e5d21e9..09339e6 100644
--- a/src/main/java/org/zwobble/couscous/util/ExtraMaps.java
+++ b/src/main/java/org/zwobble/couscous/util/ExtraMaps.java
@@ -2,6 +2,7 @@ package org.zwobble.couscous.util;
 
 import com.google.common.collect.ImmutableMap;
 
+import java.util.AbstractMap;
 import java.util.Map;
 import java.util.function.Function;
 
@@ -31,4 +32,8 @@ public class ExtraMaps {
 
         return builder.build();
     }
+
+    public static <T, K> Map<K, T> toMapWithKeys(Iterable<T> iterable, Function<T, K> function) {
+        return toMap(iterable, value -> new AbstractMap.SimpleImmutableEntry<K, T>(function.apply(value), value));
+    }
 }