From 0ac555a6d383fa76626a6123e008365e005558a3 Mon Sep 17 00:00:00 2001
From: pacien
Date: Fri, 5 Apr 2019 03:00:45 +0200
Subject: add missing map method

---
 src/main/java/org/pacien/lemonad/attempt/Attempt.java | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'src/main/java/org')

diff --git a/src/main/java/org/pacien/lemonad/attempt/Attempt.java b/src/main/java/org/pacien/lemonad/attempt/Attempt.java
index e36ac4b..9f5befa 100644
--- a/src/main/java/org/pacien/lemonad/attempt/Attempt.java
+++ b/src/main/java/org/pacien/lemonad/attempt/Attempt.java
@@ -89,6 +89,17 @@ public interface Attempt<R, E> {
     return (Attempt<R, EE>) (isFailure() ? mapper.apply(getError()) : this);
   }
 
+  /**
+   * @param resultMapper a function producing an {@link Attempt}, called with the current result if this {@link Attempt} is a success.
+   * @param errorMapper  a function producing an {@link Attempt}, called with the current error if this {@link Attempt} is a failure.
+   * @return the transformed {@link Attempt}.
+   */
+  default <RR, EE> Attempt<RR, EE> map(@NonNull Function<? super R, ? extends Attempt<? extends RR, ? extends EE>> resultMapper,
+                                       @NonNull Function<? super E, ? extends Attempt<? extends RR, ? extends EE>> errorMapper) {
+    //noinspection unchecked
+    return (Attempt<RR, EE>) (isSuccess() ? resultMapper.apply(getResult()) : errorMapper.apply(getError()));
+  }
+
   /**
    * @param mapper a function transforming an {@link Attempt}.
    * @return the transformed {@link Attempt}
-- 
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