How to get a name of a class member? - scala

Question

I want to be able to do something like this:
prepare form:
val formDescription = formBuilder(_.textField[User](_.firstName)
.textField[User](_.lastName)
).build
showForm(formDescription)
extract data from user filled form, using User:
//contains data of a form submitted by a user:
val formData: Map[String, String] = getFormData
val newUser = User(id = randomUuid, firstName = formData.extract[User](_.firstName))
One solution I see is to use a dynamic proxy that extends provided class and remembers what was invoked on him:
def getFieldName[T:Manifest](foo: T => Any) = {
val clazz = implicitly[Manifest[T]].erasure
val proxy = createDynamicProxy(clazz)
foo(proxy)
proxy.lastInvokedMethodName
}
Is there a better way to do it? Is there any lib that implements it already?

Answer 1

This reflective approach takes a case class and invokes its companion apply, calling getField and fetching default args if the field is not in the data.
import scala.reflect.runtime.{currentMirror => cm, universe => uni}
import uni._
def fromXML(xml: Node): Option[PluginDescription] = {
def extract[A]()(implicit tt: TypeTag[A]): Option[A] = {
// extract one field
def getField(field: String): Option[String] = {
val text = (xml \\ field).text.trim
if (text == "") None else Some(text)
}
val apply = uni.newTermName("apply")
val module = uni.typeOf[A].typeSymbol.companionSymbol.asModule
val ts = module.moduleClass.typeSignature
val m = (ts member apply).asMethod
val im = cm reflect (cm reflectModule module).instance
val mm = im reflectMethod m
def getDefault(i: Int): Option[Any] = {
val n = uni.newTermName("apply$default$" + (i+1))
val m = ts member n
if (m == NoSymbol) None
else Some((im reflectMethod m.asMethod)())
}
def extractArgs(pss: List[List[Symbol]]): List[Option[Any]] =
pss.flatten.zipWithIndex map (p => getField(p._1.name.encoded) orElse getDefault(p._2))
val args = extractArgs(m.paramss)
if (args exists (!_.isDefined)) None
else Some(mm(args.flatten: _*).asInstanceOf[A])
}
// check the top-level tag
xml match {
case <plugin>{_*}</plugin> => extract[PluginDescription]()
case _ => None
}
}
The idea was to do something like:
case class User(id: Int = randomUuid, firstName: String, lastName: String)
val user = extract[User]()

Answer 2

That's my own solution:
package utils
import javassist.util.proxy.{MethodHandler, MethodFilter, ProxyFactory}
import org.specs2.mutable._
import javassist.util.proxy.Proxy
import java.lang.reflect.{Constructor, Method}
class DynamicProxyTest extends Specification with MemberNameGetter {
"Dynamic proxy" should {
"extract field name" in {
memberName[TestClass](_.a) must ===("a")
memberName[TestClass](_.i) must ===("i")
memberName[TestClass](_.b) must ===("b")
memberName[TestClass](_.variable) must ===("variable")
memberName[TestClass](_.value) must ===("value")
memberName[TestClass](_.method) must ===("method")
}
}
}
trait MemberNameGetter {
def memberName[T: Manifest](foo: T => Any) = {
val mf = manifest[T]
val clazz = mf.erasure
val proxyFactory = new ProxyFactory
proxyFactory.setSuperclass(clazz)
proxyFactory.setFilter(new MethodFilter {
def isHandled(p1: Method) = true
})
val newClass = proxyFactory.createClass()
var lastInvokedMethod: String = null
val mh = new MethodHandler {
def invoke(p1: Any, p2: Method, p3: Method, p4: Array[AnyRef]) = {
lastInvokedMethod = p2.getName
p3.invoke(p1, p4: _*)
}
}
val constructor = defaultConstructor(newClass)
val parameters = defaultConstructorParameters(constructor)
// val proxy = constructor.newInstance("dsf", new Integer(0))
val proxy2 = constructor.newInstance(parameters: _*)
proxy2.asInstanceOf[Proxy].setHandler(mh)
foo(proxy2.asInstanceOf[T])
lastInvokedMethod
}
private def defaultConstructor(c: Class[_]) = c.getConstructors.head
private def defaultConstructorParameters(constructor: Constructor[_]) = {
val parameterTypes = constructor.getParameterTypes
parameterTypes.map{
case Integer.TYPE => Integer.valueOf(0)
case _ => null
}
}
}
case class TestClass(a: String, i: Int, b: Boolean) {
var variable = "asdf"
val value = "asdfasdfasd"
def method = "method"
}
val mh = new MethodHandler {
def invoke(p1: Any, p2: Method, p3: Method, p4: Array[AnyRef]) = {
lastInvokedMethod = p2.getName
p3.invoke(p1, p4: _*)
}
}
val constructor = defaultConstructor(newClass)
val parameters = defaultConstructorParameters(constructor)
// val proxy = constructor.newInstance("dsf", new Integer(0))
val proxy2 = constructor.newInstance(parameters: _*)
proxy2.asInstanceOf[Proxy].setHandler(mh)
foo(proxy2.asInstanceOf[T])
lastInvokedMethod
}
private def defaultConstructor(c: Class[_]) = c.getConstructors.head
private def defaultConstructorParameters(constructor: Constructor[_]) = {
val parameterTypes = constructor.getParameterTypes
parameterTypes.map{
case Integer.TYPE => Integer.valueOf(0)
case java.lang.Double.TYPE => java.lang.Double.valueOf(0)
case java.lang.Long.TYPE => java.lang.Long.valueOf(0)
case java.lang.Boolean.TYPE => java.lang.Boolean.FALSE
case _ => null
}
}
}
case class TestClass(a: String, i: Int, b: Boolean) {
var variable = "asdf"
val value = "asdfasdfasd"
def method = "method"
}