幸福框架：如何扩展编号生成器

背景

昨天发布了一个编号生成器（http://www.cnblogs.com/happyframework/p/3177128.html），有朋友留言问支不支持某些规则，因为是可以扩展的，所以很容易支持各种规则，今天我就写了另外两种规则，也是对留言的朋友做一个回复。

留言A

留言

这个规则其实就是访问实体的属性就行了，属性里做个判断返回X或Y。

扩展类型

using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6  7 using Happy.Infrastructure.ExtentionMethods; 8  9 namespace Happy.Domain.CodeRule.Generators10 {11     /// <summary>12     /// 属性编号生成器。13     /// </summary>14     public sealed class PropertyCodeGenerator : ICodeGenerator15     {16         private readonly string _property;17 18         /// <summary>19         /// 构造方法。20         /// </summary>21         public PropertyCodeGenerator(string property)22         {23             property.MustNotNullAndNotWhiteSpace("property");24 25             _property = property;26         }27 28         /// <inheritdoc />29         public string Generate(GenerateContext context)30         {31             return context32                 .Target33                 .GetType()34                 .GetProperty(_property)35                 .GetValue(context.Target)36                 .ToString();37         }38     }39 }

using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6 using System.Text.RegularExpressions; 7  8 namespace Happy.Domain.CodeRule.Generators 9 {10     /// <summary>11     /// 属性编号生成器解释器。12     /// </summary>13     public sealed class PropertyCodeGeneratorInterceptor : ICodeRuleInterceptor14     {15         private static readonly Regex _Regex = new Regex(@"^<属性:(?<名字>.*?)>$");16 17         /// <inheritdoc />18         public bool IsMatch(string codeRule)19         {20             return _Regex.IsMatch(codeRule);21         }22 23         /// <inheritdoc />24         public ICodeGenerator Intercept(string codeRule)25         {26             var match = _Regex.Match(codeRule);27 28             var property = match.Groups["名字"].Value;29 30             return new PropertyCodeGenerator(property);31         }32     }33 }

测试代码

        static void Main(string[] args) 2         { 3             var interceptor = new CodeRuleInterceptor(); 4  5             interceptor 6                 .RegisterInterceptor(new DateTimeCodeGeneratorInterceptor()) 7                 .RegisterInterceptor(new LiteralCodeGeneratorInterceptor()) 8                 .RegisterInterceptor(new PropertyCodeGeneratorInterceptor()) 9                 .RegisterInterceptor(new SeedCodeGeneratorInterceptor(new FileSeedStore("Seeds")))10                 .RegisterInterceptor(new LetterSeedCodeGeneratorInterceptor(new FileSeedStore("Seeds")));11 12             var generator = interceptor.Intercept("PM<日期:yyyyMMdd><属性:Code><种子:销售订单:4>");13 14             var context = new GenerateContext15             {16                 Target = new17                 {18                     Code = "X"19                 }20             };21 22             Console.WriteLine(generator.Generate(context));23             Console.WriteLine(generator.Generate(context));24             Console.WriteLine(generator.Generate(context));25         }

运行结果

留言B

留言

这位朋友实现了字母流水，我基本没有遇到过这种需求，实现一个也不麻烦，思路就是将10进制的种子数转换为26六进制的字母，这里只介绍核心实现，不贴测试代码了。

扩展代码

using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6  7 using Happy.Infrastructure.ExtentionMethods; 8  9 namespace Happy.Domain.CodeRule.Generators10 {11     /// <summary>12     /// 字母种子编号生成器。13     /// </summary>14     public sealed class LetterSeedCodeGenerator : ICodeGenerator15     {16         private readonly ISeedStore _seedStore;17         private readonly string _seedKey;18         private readonly int _seedWidth;19 20         /// <summary>21         /// 构造方法。22         /// </summary>23         public LetterSeedCodeGenerator(ISeedStore seedStore, string seedKey, int seedWidth)24         {25             seedStore.MustNotNull("seedStore");26             seedKey.MustNotNullAndNotWhiteSpace("seedKey");27             seedWidth.MustGreaterThan("seedWidth", 0);28 29             _seedStore = seedStore;30             _seedKey = seedKey;31             _seedWidth = seedWidth;32         }33 34         /// <inheritdoc />35         public string Generate(GenerateContext context)36         {37             var seed = _seedStore.NextSeed(_seedKey);38 39             return this.ToLetter(seed).PadLeft(_seedWidth, 'A');40         }41 42         private string ToLetter(int seed)43         {44             var letter = "";45 46             do47             {48                 var quotient = seed % 26;49                 seed = seed / 26;50                 letter = (char)(quotient + 65) + letter;51             } while (seed != 0);52 53             return letter;54         }55     }56 }

备注

扩展规则就不说了，应该很容易看懂！