From 12c91d0c9fc8b9e400aae47058ae41d92602f6eb Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sun, 25 Oct 2015 21:18:38 +0000
Subject: Throw IOException rather than wrapping in RuntimeException

---
 .../java/org/zwobble/couscous/util/ExtraLists.java | 36 ++++++++++++++++++++++
 1 file changed, 36 insertions(+)

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

diff --git a/src/main/java/org/zwobble/couscous/util/ExtraLists.java b/src/main/java/org/zwobble/couscous/util/ExtraLists.java
index b3c017f..36c9b06 100644
--- a/src/main/java/org/zwobble/couscous/util/ExtraLists.java
+++ b/src/main/java/org/zwobble/couscous/util/ExtraLists.java
@@ -3,8 +3,44 @@ package org.zwobble.couscous.util;
 import java.util.List;
 import java.util.function.BiFunction;
 import java.util.function.Function;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 public class ExtraLists {
+    @SuppressWarnings("unchecked")
+    public static <T, R, E extends Exception> List<R> map(
+            Stream<T> stream,
+            CheckedFunction<T, R, E> function) throws E {
+        try {
+            return stream
+                .map(value -> {
+                    try {
+                        return function.apply(value);
+                    } catch (Exception exception) {
+                        throw new StashedException(exception);
+                    }
+                })
+                .collect(Collectors.toList());
+        } catch (StashedException exception) {
+            throw (E)exception.exception;
+        }
+    }
+    
+    @FunctionalInterface
+    public static interface CheckedFunction<T, R, E extends Exception> {
+        R apply(T value) throws E;
+    }
+    
+    private static class StashedException extends RuntimeException {
+        private static final long serialVersionUID = 1L;
+        
+        private Exception exception;
+        
+        private StashedException(Exception exception) {
+            this.exception = exception;
+        }
+    }
+    
     public static <T, R> R foldLeft(
             List<T> list,
             Function<T, R> initialValue,
-- 
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