package com.gmei.lib
import scala.reflect.runtime.universe._
/**
* Abstract class for parameter case classes.
* This overrides the [[toString]] method to print all case class fields by name and value.
* @tparam T Concrete parameter class.
*/
abstract class AbstractParams[T: TypeTag] {
private def tag: TypeTag[T] = typeTag[T]
/**
* Finds all case class fields in concrete class instance, and outputs them in JSON-style format:
* {
* [field name]:\t[field value]\n
* [field name]:\t[field value]\n
* ...
* }
*/
override def toString: String = {
val tpe = tag.tpe
val allAccessors = tpe.decls.collect {
case m: MethodSymbol if m.isCaseAccessor => m
}
val mirror = runtimeMirror(getClass.getClassLoader)
val instanceMirror = mirror.reflect(this)
allAccessors.map { f =>
val paramName = f.name.toString
val fieldMirror = instanceMirror.reflectField(f)
val paramValue = fieldMirror.get
s" $paramName:\t$paramValue"
}.mkString("{\n", ",\n", "\n}")
}
}
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