Dart 2: How to access a class's type?











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In Swift 4, I used to do something like this to locally store objects of variable classes:



class Repo {
var mediaType : MyBaseClass.Type

func doSomething() {
mediaType.someStaticMethod();
}
}

class SpecificClass : MyBaseClass {
static func someStaticMethod() -> void {
// Stuff
}
}

repo = Repo(SpecificClass.self)
repo.doSomething(); // Executes `Stuff`


Moving to Dart 2, this is the closest I've gotten, yet the error specified at the bottom is blocking me.



class Repo {
Type mediaType;

void doSomething() {
mediaType.someStaticMethod();
}
}

class SpecificClass extends MyBaseClass {
static void someStaticMethod() {
// Whatever
}
}

repo = Repo(SpecificClass)
repo.doSomething() // Should execute `Whatever`, but for the error


Which generates this error:



The method 'someStaticMethod' isn't defined for the class 'Type'


Is this sort of trick feasible with Dart 2?










share|improve this question






















  • Instead of Type mediaType;, just use MyBaseClass mediaType;. It should work.
    – tenhobi
    Nov 11 at 18:19










  • Using MyBaseClass mediaType expects an instance of BaseMediaType, whereas I want to pass the class itself.
    – Craig Labenz
    Nov 11 at 18:24










  • After a bit of search, it seems it is not possible in Dart: github.com/dart-lang/sdk/issues/34131
    – tenhobi
    Nov 11 at 18:36










  • It seems it's that .Type and subsequent .self from Swift that are missing Dart equivalents and would seemingly easily allow for this.
    – Craig Labenz
    Nov 11 at 19:02










  • You can use something like github.com/google/built_value.dart/blob/… to pass type information and you can closurize the constructor to pass it around () => MyClass(). It's a bit more boilerplate but otherwise there is hardly anything you can't do.
    – Günter Zöchbauer
    Nov 11 at 20:54















up vote
2
down vote

favorite












In Swift 4, I used to do something like this to locally store objects of variable classes:



class Repo {
var mediaType : MyBaseClass.Type

func doSomething() {
mediaType.someStaticMethod();
}
}

class SpecificClass : MyBaseClass {
static func someStaticMethod() -> void {
// Stuff
}
}

repo = Repo(SpecificClass.self)
repo.doSomething(); // Executes `Stuff`


Moving to Dart 2, this is the closest I've gotten, yet the error specified at the bottom is blocking me.



class Repo {
Type mediaType;

void doSomething() {
mediaType.someStaticMethod();
}
}

class SpecificClass extends MyBaseClass {
static void someStaticMethod() {
// Whatever
}
}

repo = Repo(SpecificClass)
repo.doSomething() // Should execute `Whatever`, but for the error


Which generates this error:



The method 'someStaticMethod' isn't defined for the class 'Type'


Is this sort of trick feasible with Dart 2?










share|improve this question






















  • Instead of Type mediaType;, just use MyBaseClass mediaType;. It should work.
    – tenhobi
    Nov 11 at 18:19










  • Using MyBaseClass mediaType expects an instance of BaseMediaType, whereas I want to pass the class itself.
    – Craig Labenz
    Nov 11 at 18:24










  • After a bit of search, it seems it is not possible in Dart: github.com/dart-lang/sdk/issues/34131
    – tenhobi
    Nov 11 at 18:36










  • It seems it's that .Type and subsequent .self from Swift that are missing Dart equivalents and would seemingly easily allow for this.
    – Craig Labenz
    Nov 11 at 19:02










  • You can use something like github.com/google/built_value.dart/blob/… to pass type information and you can closurize the constructor to pass it around () => MyClass(). It's a bit more boilerplate but otherwise there is hardly anything you can't do.
    – Günter Zöchbauer
    Nov 11 at 20:54













up vote
2
down vote

favorite









up vote
2
down vote

favorite











In Swift 4, I used to do something like this to locally store objects of variable classes:



class Repo {
var mediaType : MyBaseClass.Type

func doSomething() {
mediaType.someStaticMethod();
}
}

class SpecificClass : MyBaseClass {
static func someStaticMethod() -> void {
// Stuff
}
}

repo = Repo(SpecificClass.self)
repo.doSomething(); // Executes `Stuff`


Moving to Dart 2, this is the closest I've gotten, yet the error specified at the bottom is blocking me.



class Repo {
Type mediaType;

void doSomething() {
mediaType.someStaticMethod();
}
}

class SpecificClass extends MyBaseClass {
static void someStaticMethod() {
// Whatever
}
}

repo = Repo(SpecificClass)
repo.doSomething() // Should execute `Whatever`, but for the error


Which generates this error:



The method 'someStaticMethod' isn't defined for the class 'Type'


Is this sort of trick feasible with Dart 2?










share|improve this question













In Swift 4, I used to do something like this to locally store objects of variable classes:



class Repo {
var mediaType : MyBaseClass.Type

func doSomething() {
mediaType.someStaticMethod();
}
}

class SpecificClass : MyBaseClass {
static func someStaticMethod() -> void {
// Stuff
}
}

repo = Repo(SpecificClass.self)
repo.doSomething(); // Executes `Stuff`


Moving to Dart 2, this is the closest I've gotten, yet the error specified at the bottom is blocking me.



class Repo {
Type mediaType;

void doSomething() {
mediaType.someStaticMethod();
}
}

class SpecificClass extends MyBaseClass {
static void someStaticMethod() {
// Whatever
}
}

repo = Repo(SpecificClass)
repo.doSomething() // Should execute `Whatever`, but for the error


Which generates this error:



The method 'someStaticMethod' isn't defined for the class 'Type'


Is this sort of trick feasible with Dart 2?







dart






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 11 at 18:15









Craig Labenz

1,17521112




1,17521112












  • Instead of Type mediaType;, just use MyBaseClass mediaType;. It should work.
    – tenhobi
    Nov 11 at 18:19










  • Using MyBaseClass mediaType expects an instance of BaseMediaType, whereas I want to pass the class itself.
    – Craig Labenz
    Nov 11 at 18:24










  • After a bit of search, it seems it is not possible in Dart: github.com/dart-lang/sdk/issues/34131
    – tenhobi
    Nov 11 at 18:36










  • It seems it's that .Type and subsequent .self from Swift that are missing Dart equivalents and would seemingly easily allow for this.
    – Craig Labenz
    Nov 11 at 19:02










  • You can use something like github.com/google/built_value.dart/blob/… to pass type information and you can closurize the constructor to pass it around () => MyClass(). It's a bit more boilerplate but otherwise there is hardly anything you can't do.
    – Günter Zöchbauer
    Nov 11 at 20:54


















  • Instead of Type mediaType;, just use MyBaseClass mediaType;. It should work.
    – tenhobi
    Nov 11 at 18:19










  • Using MyBaseClass mediaType expects an instance of BaseMediaType, whereas I want to pass the class itself.
    – Craig Labenz
    Nov 11 at 18:24










  • After a bit of search, it seems it is not possible in Dart: github.com/dart-lang/sdk/issues/34131
    – tenhobi
    Nov 11 at 18:36










  • It seems it's that .Type and subsequent .self from Swift that are missing Dart equivalents and would seemingly easily allow for this.
    – Craig Labenz
    Nov 11 at 19:02










  • You can use something like github.com/google/built_value.dart/blob/… to pass type information and you can closurize the constructor to pass it around () => MyClass(). It's a bit more boilerplate but otherwise there is hardly anything you can't do.
    – Günter Zöchbauer
    Nov 11 at 20:54
















Instead of Type mediaType;, just use MyBaseClass mediaType;. It should work.
– tenhobi
Nov 11 at 18:19




Instead of Type mediaType;, just use MyBaseClass mediaType;. It should work.
– tenhobi
Nov 11 at 18:19












Using MyBaseClass mediaType expects an instance of BaseMediaType, whereas I want to pass the class itself.
– Craig Labenz
Nov 11 at 18:24




Using MyBaseClass mediaType expects an instance of BaseMediaType, whereas I want to pass the class itself.
– Craig Labenz
Nov 11 at 18:24












After a bit of search, it seems it is not possible in Dart: github.com/dart-lang/sdk/issues/34131
– tenhobi
Nov 11 at 18:36




After a bit of search, it seems it is not possible in Dart: github.com/dart-lang/sdk/issues/34131
– tenhobi
Nov 11 at 18:36












It seems it's that .Type and subsequent .self from Swift that are missing Dart equivalents and would seemingly easily allow for this.
– Craig Labenz
Nov 11 at 19:02




It seems it's that .Type and subsequent .self from Swift that are missing Dart equivalents and would seemingly easily allow for this.
– Craig Labenz
Nov 11 at 19:02












You can use something like github.com/google/built_value.dart/blob/… to pass type information and you can closurize the constructor to pass it around () => MyClass(). It's a bit more boilerplate but otherwise there is hardly anything you can't do.
– Günter Zöchbauer
Nov 11 at 20:54




You can use something like github.com/google/built_value.dart/blob/… to pass type information and you can closurize the constructor to pass it around () => MyClass(). It's a bit more boilerplate but otherwise there is hardly anything you can't do.
– Günter Zöchbauer
Nov 11 at 20:54

















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