when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String packageName,
    2. String? packageVersion,
    3. String packagePath,
    4. List<InterfaceDeclaration> interfaceDeclarations,
    5. List<ExecutableDeclaration> executableDeclarations,
    6. List<FieldDeclaration> fieldDeclarations,
    7. List<TypeAliasDeclaration> typeAliasDeclarations,
    8. Set<PackageApiSemantics> semantics,
    9. AndroidPlatformConstraints? androidPlatformConstraints,
    10. IOSPlatformConstraints? iosPlatformConstraints,
    11. SdkType sdkType,
    12. List<PackageDependency> packageDependencies,
    13. Version minSdkVersion,
    14. TypeHierarchy typeHierarchy,
    )
)

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs
TResult when<TResult extends Object?>(
  TResult Function(
          String packageName,
          String? packageVersion,
          String packagePath,
          List<InterfaceDeclaration> interfaceDeclarations,
          List<ExecutableDeclaration> executableDeclarations,
          List<FieldDeclaration> fieldDeclarations,
          List<TypeAliasDeclaration> typeAliasDeclarations,
          Set<PackageApiSemantics> semantics,
          AndroidPlatformConstraints? androidPlatformConstraints,
          IOSPlatformConstraints? iosPlatformConstraints,
          SdkType sdkType,
          List<PackageDependency> packageDependencies,
          Version minSdkVersion,
          TypeHierarchy typeHierarchy)
      $default,
) {
  final _that = this;
  switch (_that) {
    case _PackageApi():
      return $default(
          _that.packageName,
          _that.packageVersion,
          _that.packagePath,
          _that.interfaceDeclarations,
          _that.executableDeclarations,
          _that.fieldDeclarations,
          _that.typeAliasDeclarations,
          _that.semantics,
          _that.androidPlatformConstraints,
          _that.iosPlatformConstraints,
          _that.sdkType,
          _that.packageDependencies,
          _that.minSdkVersion,
          _that.typeHierarchy);
  }
}