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using System; |
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using System.Collections; |
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using System.Collections.Generic; |
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using System.Security.AccessControl; |
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using System.Text; |
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namespace Apewer |
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{ |
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/// <summary></summary>
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public sealed class Enumerator<T> : IEnumerator<T>, IEnumerator, IDisposable |
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{ |
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// 类的状态
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bool _disposed = false; |
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string _type; |
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// 元素获取
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Func<int, Class<T>> _getter = null; |
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// 迭代器
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int _index = 0; |
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T _current = default; |
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#region IDisposable
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/// <summary></summary>
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public void Dispose() |
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{ |
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_disposed = true; |
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} |
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#endregion
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#region IEnumerator<T>
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/// <summary></summary>
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public T Current |
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{ |
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get |
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{ |
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if (_disposed) throw new ObjectDisposedException(_type); |
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return _current; |
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} |
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} |
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#endregion
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#region IEnumerator
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/// <summary></summary>
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object IEnumerator.Current { get => Current; } |
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/// <summary></summary>
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public bool MoveNext() |
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{ |
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if (_disposed) throw new ObjectDisposedException(_type); |
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var value = _getter(_index); |
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if (value == null) return false; |
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_current = value.Value; |
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_index++; |
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return true; |
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} |
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/// <summary></summary>
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public void Reset() |
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{ |
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if (_disposed) throw new ObjectDisposedException(_type); |
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_current = default; |
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_index = 0; |
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} |
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#endregion
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/// <summary>创建枚举器实例。</summary>
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/// <param name="getter">元素获取程序。传入参数为索引值,从 0 开始;枚举结束后应返回 NULL 值。</param>
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/// <exception cref="ArgumentNullException" />
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public Enumerator(Func<int, Class<T>> getter) |
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{ |
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if (getter == null) throw new ArgumentNullException(nameof(getter)); |
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_getter = getter; |
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_type = GetType().Name; |
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Reset(); |
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} |
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} |
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} |
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