Can't get constructor of java defined class in reflect api #18694
Labels
area:metaprogramming:reflection
Issues related to the quotes reflection API
itype:bug
itype:question
Comments
goshacodes
added
itype:bug
stat:needs triage
nicolasstucki
added
itype:question
area:metaprogramming:reflection
|
@goshacodes could you provide the implementation of the macro? |
|
Implementation is here: You can also reproduce it:
val m = mock[JavaClassWithBridgeMethod]compile and you will get an
def asParent(tree: TypeTree): TypeTree | Term =
val typeSymbol = tpe.dealias.typeSymbol
val constructor = typeSymbol.declarations.filter(sym => sym.isClassConstructor && !sym.flags.is(Flags.Private))
.sortBy(_ != typeSymbol.primaryConstructor)
.headOption
.getOrElse(report.errorAndAbort("Constructor not found"))
val constructorFieldsFilledWithNulls: List[List[Term]] =
constructor.paramSymss
.filter(_.exists(!_.isType))
.map(_.map(_.typeRef.asType match { case '[t] => '{ null.asInstanceOf[t] }.asTerm }))
if constructorFieldsFilledWithNulls.forall(_.isEmpty) then
tree
else
Select(
New(TypeIdent(tree.tpe.typeSymbol)),
constructor
).appliedToArgss(constructorFieldsFilledWithNulls)
and you will get
val constructorFieldsFilledWithNulls: List[List[Term]] =
if (constructor.flags.is(Flags.JavaDefined) && constructor != typeSymbol.primaryConstructor)
List(List('{ () }.asTerm))
else
constructor.paramSymss
.filter(_.exists(!_.isType))
.map(_.map(_.typeRef.asType match { case '[t] => '{ null.asInstanceOf[t] }.asTerm }))and you will get |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Compiler version
3.3.0
Description
I'm trying to extend a java class using reflect api.
To create a symbol for a class I need parent, either TypeTree or Term. TypeTree is not working here, so I'am trying to get a constructor and apply nulls as arguments
Minimized code
When I'm trying to use
tpe.typeSymbol.primaryConstructorcompiler crushes with this:So instead of trying to use primary constructor, I am trying to use another public one and I got this one.
After it I am trying to pass there a () as argument and it gives me another error:
The text was updated successfully, but these errors were encountered: