more api

LuckPerms.Torch.Utils/Utils/Extensions/IteratorExtensions.cs

@@ -0,0 +1,57 @@
+using System.Collections;
+using java.util;
+using java.util.stream;
+
+namespace LuckPerms.Torch.Utils.Extensions;
+
+public static class IteratorExtensions
+{
+    public static StreamEnumerable<T> AsEnumerable<T>(this BaseStream stream) => new(stream);
+    
+    public static IteratorEnumerator<object> GetEnumerator(this BaseStream stream) => new(stream.iterator());
+
+    public struct StreamEnumerable<T>(BaseStream stream) : IEnumerable<T>
+    {
+        public IteratorEnumerator<T> GetEnumerator() => new(stream.iterator());
+        
+        IEnumerator<T> IEnumerable<T>.GetEnumerator() => GetEnumerator();
+        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+    }
+
+    public static IteratorEnumerator<object> GetEnumerator(this Iterator iterator) => new(iterator);
+    
+    public static IteratorEnumerable<T> AsEnumerable<T>(this Iterator iterator) => new(iterator);
+
+    public struct IteratorEnumerator<T>(Iterator iterator) : IEnumerator<T>
+    {
+        public bool MoveNext()
+        {
+            if (!iterator.hasNext()) return false;
+            
+            Current = (T)iterator.next();
+            return true;
+        }
+
+        public void Reset()
+        {
+            throw new NotSupportedException();
+        }
+
+        object? IEnumerator.Current => Current;
+
+        public T Current { get; private set; }
+
+        public void Dispose()
+        {
+        }
+    }
+    
+    public struct IteratorEnumerable<T>(Iterator iterator) : IEnumerable<T>
+    {
+        public IteratorEnumerator<T> GetEnumerator() => new(iterator);
+
+        IEnumerator<T> IEnumerable<T>.GetEnumerator() => GetEnumerator();
+
+        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+    }
+}