IteratorWrapper.cs

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using System;
using System.Collections;
using System.Collections.Generic;
 
namespace java.util
{
 
    class IteratorWrapper<T> : IEnumerator<T>
    {
 
        readonly Iterator _iterator;
        T? _current;
        int _position = -1;
 
        public IteratorWrapper(Iterator iterator)
        {
            _iterator = iterator ?? throw new ArgumentNullException(nameof(iterator));
        }
 
        public T Current => _position > -1 ? _current! : throw new InvalidOperationException();
 
        object? IEnumerator.Current => _current;
 
        public bool MoveNext()
        {
            if (_iterator.hasNext())
            {
                _current = (T)_iterator.next();
                _position++;
                return true;
            }
 
            return false;
        }
 
        public void Dispose()
        {
 
        }
 
        public void Reset()
        {
            throw new NotSupportedException();
        }
 
    }
 
}