scala - How to find field annotations for a MethodSymbol? -

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suppose have found set of methods type:

case class x()  object a{    @someannotation    val x=x() }  def totype[t](a:t)(implicit tag: typetag[t]): type = tag.tpe  val typ = totype(a)  // public methods return x val intmethods = typ.members.collect{ case m: ru.methodsymbol if     m.isgetter && m.ispublic && m.returntype <:< typeof[x]  => m }

how efficiently find corresponding annotations each element of intmethods?

intmethods.head.annotations

is empty because there 2 entries in typ.decls x. 1 found method , other non-method field holds annotations. can search matching on:

getannotations(intmethods.head.toterm.name.tostring.trim)  def getannotations( name: string) ={   typ.decls.filter{ s=>s.name.tostring.trim==name.trim && !s.ismethod}.flatmap(_.annotations) }

but tostringing , trimming extremely slow (the trim required because, 1 of decls contains trailing space, , other not). there better way directly lookup corresponding class field methodsymbol?

you can backing field of getter accessed method:

intmethods.head.accessed.annotations

from documentation:

/** backing field accessor method, nosymbol other term symbols. */ abstract def accessed: universe.symbol

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