我正在尝试抽象出针对特定类型触发的 json 解析逻辑。
我开始创建 Parser 特征,如下所示:
trait Parser {
def parse[T](payload : String) : Try[T]
}
我有一个名为 JsonParser 的特性的实现,它是:
class JsonParser extends Parser {
override def parse[T](payload: String): Try[T] = parseInternal(payload)
private def parseInternal[T:JsonParserLike](payload:String):Try[T] = {
implicitly[JsonParserLike[T]].parse(payload)
}
}
JsonParserLike 定义如下:
trait JsonParserLike[T] {
def parse(payload: String): Try[T]
}
object JsonParserLike {
implicit val type1Parser:JsonParserLike[Type1] = new JsonParserLike[Type1]
{
//json parsing logic for Type1
}
implicit val type2Parser:JsonParserLike[Type2] = new JsonParserLike[Type2]
{
//json parsing logic for Type2
}
}
当我尝试编译上述内容时,编译失败并显示:
ambiguous implicit values:
[error] both value type1Parse in object JsonParserLike of type => parser.jsonutil.JsonParserLike[parser.models.Type1]
[error] and value type2Parser in object JsonParserLike of type => parser.jsonutil.JsonParserLike[parser.models.Type2]
[error] match expected type parser.jsonutil.JsonParserLike[T]
[error] override def parse[T](payload: String): Try[T] = parseInternal(payload)
不知道为什么隐式解析在这里失败。是因为特征中的parse
方法Parser
没有参数类型的参数T
吗?
我尝试了另一种方法如下:
trait Parser {
def parse[T](payload : String) : Try[T]
}
class JsonParser extends Parser {
override def parse[T](payload: String): Try[T] = {
import workflow.parser.JsonParserLike._
parseInternal[T](payload)
}
private def parseInternal[U](payload:String)(implicit c:JsonParserLike[U]):Try[U] = {
c.parse(payload)
}
}
以上给了我以下错误:
could not find implicit value for parameter c: parser.JsonParserLike[T]
[error] parseInternal[T](payload)
[error]
^
编辑:从 REPL 添加会话
scala> case class Type1(name: String)
defined class Type1
scala> case class Type2(name:String)
defined class Type2
scala> :paste
// Entering paste mode (ctrl-D to finish)
import scala.util.{Failure, Success, Try}
trait JsonParserLike[+T] {
def parse(payload: String): Try[T]
}
object JsonParserLike {
implicit val type1Parser:JsonParserLike[Type1] = new JsonParserLike[Type1] {
override def parse(payload: String): Try[Type1] = Success(Type1("type1"))
}
implicit val type2Parser:JsonParserLike[Type2] = new JsonParserLike[Type2] {
override def parse(payload: String): Try[Type2] = Success(Type2("type2"))
}
}
// Exiting paste mode, now interpreting.
import scala.util.{Failure, Success, Try}
defined trait JsonParserLike
defined object JsonParserLike
scala> :paste
// Entering paste mode (ctrl-D to finish)
trait Parser {
def parse[T](payload : String) : Try[T]
}
class JsonParser extends Parser {
override def parse[T](payload: String): Try[T] = parseInternal(payload)
private def parseInternal[T:JsonParserLike](payload:String):Try[T] = {
implicitly[JsonParserLike[T]].parse(payload)
}
}
// Exiting paste mode, now interpreting.
<pastie>:24: error: ambiguous implicit values:
both value type1Parser in object JsonParserLike of type => JsonParserLike[Type1]
and value type2Parser in object JsonParserLike of type => JsonParserLike[Type2]
match expected type JsonParserLike[T]
override def parse[T](payload: String): Try[T] = parseInternal(payload)