Initial Commit

iTechSharp/System/util/ListIterator.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Collections;
+
+namespace System.util {
+    /// <summary>
+    /// Summary description for ListIterator.
+    /// </summary>
+    public class ListIterator {
+        ArrayList col;
+        int cursor = 0;
+        int lastRet = -1;
+
+        public ListIterator(ArrayList col) {
+            this.col = col;
+        }
+
+        public bool HasNext() {
+            return cursor != col.Count;
+        }
+
+        public object Next() {
+            Object next = col[cursor];
+            lastRet = cursor++;
+            return next;
+        }
+
+        public object Previous() {
+            int i = cursor - 1;
+            Object previous = col[i];
+            lastRet = cursor = i;
+            return previous;
+        }
+
+        public void Remove() {
+            if (lastRet == -1)
+                throw new InvalidOperationException();
+            col.RemoveAt(lastRet);
+            if (lastRet < cursor)
+                cursor--;
+            lastRet = -1;
+        }
+    }
+}