feat: 实现 Java → C# 转换器 (Task 2.5)
新增组件: - JavaToCSharpStrategy: Java 到 C# 转换策略 - JavaToCSharpConverter: Java 到 C# 转换器 - JavaParser: Java 简化解析器（基于文本处理） - CSharpCodeGenerator: C# 代码生成器 功能实现: - 18 种类型映射（Java → C#） - package → namespace 转换 - import → using 转换 - JavaDoc → XML Doc 转换 - Stream API 检测并添加 TODO - CompletableFuture 检测并添加 TODO 测试覆盖: - 添加 4 个 JavaToCSharpConverterTests 测试用例 - 总测试数 17 个，全部通过 Co-authored-by: monkeycode-ai <monkeycode-ai@chaitin.com>
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monkeycode-ai
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using CodePlay.Core.Interfaces;
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using CodePlay.Core.Models;
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using CodePlay.Core.Common;
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namespace CodePlay.Core.Converters;
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/// <summary>
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/// Java 到 C# 转换策略
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/// </summary>
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public class JavaToCSharpStrategy : IConversionStrategy
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{
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/// <summary>
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/// 源语言
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/// </summary>
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public LanguageType SourceLanguage => LanguageType.Java;
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/// <summary>
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/// 目标语言
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/// </summary>
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public LanguageType TargetLanguage => LanguageType.CSharp;
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private readonly List<TypeMapping> _typeMappings = new();
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public JavaToCSharpStrategy()
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{
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InitializeTypeMappings();
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}
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private void InitializeTypeMappings()
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{
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_typeMappings.AddRange(new[]
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{
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new TypeMapping("java.lang.String", "string"),
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new TypeMapping("java.lang.Object", "object"),
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new TypeMapping("java.lang.Integer", "int"),
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new TypeMapping("java.lang.Long", "long"),
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new TypeMapping("java.lang.Boolean", "bool"),
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new TypeMapping("java.lang.Double", "double"),
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new TypeMapping("java.lang.Float", "float"),
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new TypeMapping("java.util.ArrayList", "List"),
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new TypeMapping("java.util.List", "IEnumerable"),
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new TypeMapping("java.util.HashMap", "Dictionary"),
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new TypeMapping("java.util.Map", "IDictionary"),
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new TypeMapping("java.util.stream.Stream", "IEnumerable"),
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new TypeMapping("java.util.Arrays", "Array"),
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new TypeMapping("java.time.LocalDateTime", "DateTime"),
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new TypeMapping("java.time.Duration", "TimeSpan"),
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new TypeMapping("java.lang.Exception", "Exception"),
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new TypeMapping("java.lang.IllegalArgumentException", "ArgumentException"),
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new TypeMapping("java.lang.IllegalStateException", "InvalidOperationException"),
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new TypeMapping("java.lang.NullPointerException", "NullReferenceException"),
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new TypeMapping("java.util.concurrent.CompletableFuture", "Task"),
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new TypeMapping("System.out.println", "Console.WriteLine"),
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new TypeMapping("public static void main", "static void Main"),
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});
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}
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/// <summary>
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/// 映射类型
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/// </summary>
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public string MapType(string sourceType)
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{
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var result = sourceType;
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foreach (var mapping in _typeMappings)
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{
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result = result.Replace(mapping.SourceType, mapping.TargetType);
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}
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// Java 到 C# 的特定转换
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result = result
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.Replace("var ", "var ")
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.Replace("final ", "")
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.Replace(".size()", ".Count")
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.Replace(".length", ".Length")
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.Replace(".equals(", ".Equals(")
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.Replace(".toString()", ".ToString()")
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.Replace(".hashCode()", ".GetHashCode()");
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return result;
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}
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/// <summary>
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/// 转换语法节点
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/// </summary>
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public Interfaces.SyntaxNode ConvertNode(Interfaces.SyntaxNode node, ConversionContext context)
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{
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var newNode = new Interfaces.SyntaxNode
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{
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Type = node.Type,
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Text = ConvertText(node.Text, context),
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Metadata = new Dictionary<string, object?>(node.Metadata),
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Parent = node.Parent,
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Children = new List<Interfaces.SyntaxNode>(),
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IsUnconvertible = node.IsUnconvertible,
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TodoDescription = node.TodoDescription
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};
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foreach (var child in node.Children)
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{
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var convertedChild = ConvertNode(child, context);
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convertedChild.Parent = newNode;
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newNode.Children.Add(convertedChild);
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}
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// 检测不可转换的语法
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CheckUnconvertibleSyntax(node.Text, context);
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return newNode;
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}
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private string ConvertText(string text, ConversionContext context)
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{
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var result = text;
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// package 转 namespace
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if (result.StartsWith("package "))
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{
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result = result.Replace("package ", "namespace ")
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.Replace(";", " {");
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}
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// import 转 using
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if (result.StartsWith("import "))
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{
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result = result.Replace("import ", "using ")
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.Replace(";", ";");
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}
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// 类型映射
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result = MapType(result);
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// Java 特定语法处理
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result = result
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.Replace("super.", "base.")
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.Replace("System.out.println", "Console.WriteLine")
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.Replace("@Override", "[Override]")
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.Replace("extends", ":")
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.Replace("implements", ":");
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// 方法声明转换
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result = System.Text.RegularExpressions.Regex.Replace(
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result,
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@"public\s+(\w+)\s+get(\w+)\(\)",
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"public $1 Get$2 { get; }"
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);
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result = System.Text.RegularExpressions.Regex.Replace(
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result,
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@"public\s+void\s+set(\w+)\(\1\s+\w+\)",
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"public void Set$1 { set; }"
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);
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return result;
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}
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private void CheckUnconvertibleSyntax(string text, ConversionContext context)
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{
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// 检测 Stream API
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if (text.Contains(".stream(") || text.Contains("Stream."))
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{
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context.Issues.Add(new ConversionIssue
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{
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Type = IssueType.UnconvertibleSyntax,
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Description = "Java Stream API 需要转换为 LINQ",
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OriginalCode = text,
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Suggestion = "使用 LINQ 替代：stream().filter() → .Where(), stream().map() → .Select()"
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});
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context.TodoItems.Add(new TodoItem
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{
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Description = "将 Stream API 转换为 LINQ",
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OriginalSyntax = "Stream API",
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WhyNotDirect = "Java Stream 和 LINQ 语法不同，需要手动调整",
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RecommendedAlternative = "使用 .Where(), .Select(), .Aggregate() 等 LINQ 方法"
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});
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}
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// 检测 CompletableFuture
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if (text.Contains("CompletableFuture") || text.Contains("thenApply") || text.Contains("thenAccept"))
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{
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context.Issues.Add(new ConversionIssue
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{
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Type = IssueType.UnconvertibleSyntax,
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Description = "CompletableFuture 需要转换为 async/await",
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OriginalCode = text,
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Suggestion = "使用 async/await 模式：completableFuture.thenApply() → await Task"
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});
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context.TodoItems.Add(new TodoItem
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{
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Description = "将 CompletableFuture 转换为 async/await",
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OriginalSyntax = "CompletableFuture",
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WhyNotDirect = "Java CompletableFuture 和 C# async/await 模式不同",
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RecommendedAlternative = "使用 Task<T> 和 async/await 关键字"
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});
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}
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// 检测接口默认方法
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if (text.Contains("default ") && text.Contains(" interface "))
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{
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context.Logs.Add(new TransformationLog
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{
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Timestamp = DateTime.UtcNow,
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Operation = "Warning",
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Details = "Java 接口默认方法需要特殊处理",
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Level = LogLevel.Warning
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});
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}
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}
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}
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