1 files changed, 10 insertions, 0 deletions
diff --git a/src/main/java/me/shedaniel/rei/utils/CollectionUtils.java b/src/main/java/me/shedaniel/rei/utils/CollectionUtils.java
index d47d732be..33f8ef457 100644
--- a/src/main/java/me/shedaniel/rei/utils/CollectionUtils.java
+++ b/src/main/java/me/shedaniel/rei/utils/CollectionUtils.java
@@ -32,6 +32,8 @@ import net.fabricmc.api.Environment;
 import java.util.*;
 import java.util.function.Function;
 import java.util.function.Predicate;
+import java.util.function.Supplier;
+import java.util.stream.Collectors;
 
 public class CollectionUtils {
     public static <A, B> List<B> getOrPutEmptyList(Map<A, List<B>> map, A key) {
@@ -157,6 +159,14 @@ public class CollectionUtils {
         return l;
     }
     
+    public static <T, R> List<R> mapParallel(Collection<T> list, Function<T, R> function) {
+        return list.parallelStream().map(function).collect(Collectors.toList());
+    }
+    
+    public static <T, R, C extends Collection<R>> C mapParallel(Collection<T> list, Function<T, R> function, Supplier<C> supplier) {
+        return list.parallelStream().map(function).collect(Collectors.toCollection(supplier));
+    }
+    
     public static <T, R> List<R> map(T[] list, Function<T, R> function) {
         List<R> l = new ArrayList<>(list.length + 1);
         for (T t : list) {