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130 lines
4.1 KiB
130 lines
4.1 KiB
using System;
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/// <summary>装箱类。</summary>
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public sealed class Class<T> : IComparable, IComparable<T>, IComparable<Class<T>>
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{
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private bool _hashcode = false;
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private bool _equals = false;
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/// <summary>装箱对象。</summary>
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public T Value { get; set; }
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/// <summary></summary>
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public bool IsNull { get { return Value == null; } }
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/// <summary></summary>
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public bool HasValue { get { return Value != null; } }
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/// <summary>创建默认值。</summary>
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public Class(T value = default, bool tryEquals = true, bool tryHashCode = true)
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{
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Value = value;
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_hashcode = tryHashCode;
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_equals = tryEquals;
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}
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#region Override
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/// <summary></summary>
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public override int GetHashCode()
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{
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if (_hashcode && Value != null)
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{
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return Value.GetHashCode();
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}
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return base.GetHashCode();
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}
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/// <summary></summary>
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public override bool Equals(object obj)
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{
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if (_equals)
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{
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var right = obj as Class<T>;
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if (right == null) return false;
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if (Value == null && right.Value == null) return true;
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if (Value == null && right.Value != null) return false;
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if (Value != null && right.Value == null) return false;
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return Value.Equals(right.Value);
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}
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return base.Equals(obj);
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}
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/// <summary></summary>
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public override string ToString()
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{
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if (Value == null) return "";
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return Value.ToString();
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}
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#endregion
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#region IComparable
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/// <summary></summary>
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/// <exception cref="MissingMemberException"></exception>
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/// <exception cref="NotSupportedException"></exception>
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public int CompareTo(object obj)
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{
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if (obj != null && obj is T) return CompareTo((T)obj);
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if (obj != null && obj is Class<T>) return CompareTo(obj as Class<T>);
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if (Value == null) throw new MissingMemberException(typeof(T).FullName, nameof(Value));
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if (!(Value is IComparable)) throw new NotSupportedException();
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return ((IComparable)Value).CompareTo(obj);
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}
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/// <summary></summary>
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/// <exception cref="MissingMemberException"></exception>
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/// <exception cref="NotSupportedException"></exception>
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public int CompareTo(T other)
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{
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if (Value == null) throw new MissingMemberException(typeof(T).FullName, nameof(Value));
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if (!(Value is IComparable)) throw new NotSupportedException();
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return ((IComparable<T>)Value).CompareTo(other);
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}
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/// <summary></summary>
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/// <exception cref="MissingMemberException"></exception>
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/// <exception cref="NotSupportedException"></exception>
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public int CompareTo(Class<T> other)
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{
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if (Value == null) throw new MissingMemberException(typeof(T).FullName, nameof(Value));
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if (other == null || !other.HasValue) return 1;
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if (Value is IComparable) return ((IComparable)Value).CompareTo(other.Value);
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if (Value is IComparable<T>) return ((IComparable<T>)Value).CompareTo(other.Value);
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throw new NotSupportedException();
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}
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#endregion
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#region 运算符。
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/// <summary>从 Class<T> 到 Boolean 的隐式转换,判断 Class<T> 包含值。</summary>
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/// <remarks>当 T 是 Boolean 时,获取 Value。<br />当 T 是 String 时,判断 Value 不为 NULL 且不为空。</remarks>
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public static implicit operator bool(Class<T> instance)
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{
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if (instance == null) return false;
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var boolean = instance as Class<bool>;
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if (boolean != null) return boolean.Value;
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var text = instance as Class<string>;
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if (text != null) return !string.IsNullOrEmpty(text.Value);
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return instance.HasValue;
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}
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// /// <summary>从 Class<T> 到 T 的隐式转换。</summary>
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// public static implicit operator T(Class<T> instance) => instance == null ? default : instance.Value;
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// /// <summary>从 T 到 Class<T> 的隐式转换。</summary>
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// public static implicit operator Class<T>(T value) => new Class<T>(value);
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#endregion
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}
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