Java 注解处理到 KSP 参考

程序元素

Java	KSP 中对应的功能	备注
`AnnotationMirror`	`KSAnnotation`
`AnnotationValue`	`KSValueArguments`
`Element`	`KSDeclaration` / `KSDeclarationContainer`
`ExecutableElement`	`KSFunctionDeclaration`
`PackageElement`	`KSFile`	KSP 不将包建模为程序元素
`Parameterizable`	`KSDeclaration`
`QualifiedNameable`	`KSDeclaration`
`TypeElement`	`KSClassDeclaration`
`TypeParameterElement`	`KSTypeParameter`
`VariableElement`	`KSValueParameter` / `KSPropertyDeclaration`

类型

KSP 需要显式类型解析，因此 Java 中的某些功能只能通过 KSType 及其解析前的相应元素来实现。

Java	KSP 中对应的功能	备注
`ArrayType`	`KSBuiltIns.arrayType`
`DeclaredType`	`KSType` / `KSClassifierReference`
`ErrorType`	`KSType.isError`
`ExecutableType`	`KSType` / `KSCallableReference`
`IntersectionType`	`KSType` / `KSTypeParameter`
`NoType`	`KSType.isError`	KSP 中不适用
`NullType`		KSP 中不适用
`PrimitiveType`	`KSBuiltIns`	与 Java 中的基本类型不完全相同
`ReferenceType`	`KSTypeReference`
`TypeMirror`	`KSType`
`TypeVariable`	`KSTypeParameter`
`UnionType`	N/A	Kotlin 的每个 catch 块只支持一种类型。即使 Java 注解处理器也无法观察到 `UnionType`。
`WildcardType`	`KSType` / `KSTypeArgument`

其他

Java	KSP 中对应的功能	备注
`Name`	`KSName`
`ElementKind`	`ClassKind` / `FunctionKind`
`Modifier`	`Modifier`
`NestingKind`	`ClassKind` / `FunctionKind`
`AnnotationValueVisitor`
`ElementVisitor`	`KSVisitor`
`AnnotatedConstruct`	`KSAnnotated`
`TypeVisitor`
`TypeKind`	`KSBuiltIns`	部分可在内置类型中找到，否则请检查 `KSClassDeclaration` 以获取 `DeclaredType`
`ElementFilter`	`Collection.filterIsInstance`
`ElementKindVisitor`	`KSVisitor`
`ElementScanner`	`KSTopDownVisitor`
`SimpleAnnotationValueVisitor`		KSP 中不需要
`SimpleElementVisitor`	`KSVisitor`
`SimpleTypeVisitor`
`TypeKindVisitor`
`Types`	`Resolver` / `utils`	部分 `utils` 也已集成到符号接口中
`Elements`	`Resolver` / `utils`

详细信息

了解 KSP 如何实现 Java 注解处理 API 的功能。

AnnotationMirror

Java	KSP 等效项
`getAnnotationType`	`ksAnnotation.annotationType`
`getElementValues`	`ksAnnotation.arguments`

AnnotationValue

Java	KSP 等效项
`getValue`	`ksValueArgument.value`

Element

Java	KSP 等效项
`asType`	`ksClassDeclaration.asType(...)` 仅适用于 `KSClassDeclaration`。需要提供类型参数。
`getAnnotation`	待实现
`getAnnotationMirrors`	`ksDeclaration.annotations`
`getEnclosedElements`	`ksDeclarationContainer.declarations`
`getEnclosingElements`	`ksDeclaration.parentDeclaration`
`getKind`	根据 `ClassKind` 或 `FunctionKind` 进行类型检查和转换
`getModifiers`	`ksDeclaration.modifiers`
`getSimpleName`	`ksDeclaration.simpleName`

ExecutableElement

Java	KSP 等效项
`getDefaultValue`	待实现
`getParameters`	`ksFunctionDeclaration.parameters`
`getReceiverType`	`ksFunctionDeclaration.parentDeclaration`
`getReturnType`	`ksFunctionDeclaration.returnType`
`getSimpleName`	`ksFunctionDeclaration.simpleName`
`getThrownTypes`	Kotlin 中不需要
`getTypeParameters`	`ksFunctionDeclaration.typeParameters`
`isDefault`	检查父声明是否为接口
`isVarArgs`	`ksFunctionDeclaration.parameters.any { it.isVarArg }`

Parameterizable

Java	KSP 等效项
`getTypeParameters`	`ksFunctionDeclaration.typeParameters`

QualifiedNameable

Java	KSP 等效项
`getQualifiedName`	`ksDeclaration.qualifiedName`

TypeElement

Java	KSP 等效项
`getEnclosedElements`	`ksClassDeclaration.declarations`
`getEnclosingElement`	`ksClassDeclaration.parentDeclaration`
`getInterfaces`	kotlin `// 无需解析即可完成 ksClassDeclaration.superTypes .map { it.resolve() } .filter { (it?.declaration as? KSClassDeclaration)?.classKind == ClassKind.INTERFACE }`
`getNestingKind`	检查 `KSClassDeclaration.parentDeclaration` 和 `inner` 修饰符
`getQualifiedName`	`ksClassDeclaration.qualifiedName`
`getSimpleName`	`ksClassDeclaration.simpleName`
`getSuperclass`	kotlin `// 无需解析即可完成 ksClassDeclaration.superTypes .map { it.resolve() } .filter { (it?.declaration as? KSClassDeclaration)?.classKind == ClassKind.CLASS }`
`getTypeParameters`	`ksClassDeclaration.typeParameters`

TypeParameterElement

Java	KSP 等效项
`getBounds`	`ksTypeParameter.bounds`
`getEnclosingElement`	`ksTypeParameter.parentDeclaration`
`getGenericElement`	`ksTypeParameter.parentDeclaration`

VariableElement

Java	KSP 等效项
`getConstantValue`	待实现
`getEnclosingElement`	`ksValueParameter.parentDeclaration`
`getSimpleName`	`ksValueParameter.simpleName`

ArrayType

Java	KSP 等效项
`getComponentType`	`ksType.arguments.first()`

DeclaredType

Java	KSP 等效项
`asElement`	`ksType.declaration`
`getEnclosingType`	`ksType.declaration.parentDeclaration`
`getTypeArguments`	`ksType.arguments`

ExecutableType

NOTE

函数的 KSType 只是由 FunctionN<R, T1, T2, ..., TN> 系列表示的签名。

Java	KSP 等效项
`getParameterTypes`	`ksType.declaration.typeParameters`, `ksFunctionDeclaration.parameters.map { it.type }`
`getReceiverType`	`ksFunctionDeclaration.parentDeclaration.asType(...)`
`getReturnType`	`ksType.declaration.typeParameters.last()`
`getThrownTypes`	Kotlin 中不需要
`getTypeVariables`	`ksFunctionDeclaration.typeParameters`

IntersectionType

Java	KSP 等效项
`getBounds`	`ksTypeParameter.bounds`

TypeMirror

Java	KSP 等效项
`getKind`	与 `KSBuiltIns` 中的基本类型、`Unit` 类型进行比较，否则为声明类型

TypeVariable

Java	KSP 等效项
`asElement`	`ksType.declaration`
`getLowerBound`	待定。仅在提供了捕获且需要显式边界检查时才需要。
`getUpperBound`	`ksTypeParameter.bounds`

WildcardType

Java	KSP 等效项
`getExtendsBound`	kotlin `if (ksTypeArgument.variance == Variance.COVARIANT) ksTypeArgument.type else null`
`getSuperBound`	kotlin `if (ksTypeArgument.variance == Variance.CONTRAVARIANT) ksTypeArgument.type else null`

Elements

Java	KSP 等效项
`getAllAnnotationMirrors`	`KSDeclarations.annotations`
`getAllMembers`	`getAllFunctions`，`getAllProperties` 待实现
`getBinaryName`	待定，参见 Java 规范
`getConstantExpression`	存在常量值，而非表达式
`getDocComment`	待实现
`getElementValuesWithDefaults`	待实现
`getName`	`resolver.getKSNameFromString`
`getPackageElement`	不支持包，但可以检索包信息。KSP 无法对包进行操作
`getPackageOf`	不支持包
`getTypeElement`	`Resolver.getClassDeclarationByName`
`hides`	待实现
`isDeprecated`	kotlin `KsDeclaration.annotations.any { it.annotationType.resolve()!!.declaration.qualifiedName!!.asString() == Deprecated::class.qualifiedName }`
`overrides`	`KSFunctionDeclaration.overrides` / `KSPropertyDeclaration.overrides` （相应类的成员函数）
`printElements`	KSP 在大多数类上都有基本的 `toString()` 实现

Types

Java	KSP 等效项
`asElement`	`ksType.declaration`
`asMemberOf`	`resolver.asMemberOf`
`boxedClass`	不需要
`capture`	待定
`contains`	`KSType.isAssignableFrom`
`directSuperTypes`	`(ksType.declaration as KSClassDeclaration).superTypes`
`erasure`	`ksType.starProjection()`
`getArrayType`	`ksBuiltIns.arrayType.replace(...)`
`getDeclaredType`	`ksClassDeclaration.asType`
`getNoType`	`ksBuiltIns.nothingType` / `null`
`getNullType`	根据上下文，`KSType.markNullable` 可能会有用
`getPrimitiveType`	不需要，请检查 `KSBuiltins`
`getWildcardType`	在期望 `KSTypeArgument` 的地方使用 `Variance`
`isAssignable`	`ksType.isAssignableFrom`
`isSameType`	`ksType.equals`
`isSubsignature`	`functionTypeA == functionTypeB` / `functionTypeA == functionTypeB.starProjection()`
`isSubtype`	`ksType.isAssignableFrom`
`unboxedType`	不需要