Recuperando a home e a user time line do twitter com scala

RetrieveTimeLine.scala

package com.softsimples.social.twitter

import com.softsimples.social.social.json.Json
import scala.collection.mutable.MutableList
import org.scribe.model.{Token, Response}
import com.softsimples.social.social.oauth.OAuthWrapper

class RetrieveTimeLine(val wrapper:OAuthWrapper, basePath:String, accessToken:Token) {

  def userTimeLine(): List[Map[String, Any]] = {
    if (accessToken == null) throw new IllegalStateException("AccessToken not yet ajusted")
    val response:Response = wrapper.sendRequest( wrapper.buildGetRequest(basePath+"statuses/user_timeline.json", accessToken) )
    parseMessages( wrapper.getResponseBody(response) )
  }

  def homeTimeLineSince(since_id:String): List[Map[String, Any]] = {
    if (accessToken == null) throw new IllegalStateException("AccessToken not yet ajusted")
    tryGet800Messages(since_id)
  }

  private def tryGet800Messages(since_id:String): List[Map[String, Any]] = {
    val messages = MutableList[Map[String,  Any]]()
    for (page <- 1 to 4) processPage(since_id, page, messages)
    messages.toList
  }

  private def processPage(since_id: String, page: Int, messages: MutableList[Map[String, Any]]) {
    val messagesOnPage = parseMessages( requestHomeTimeLineSinceAndPage(since_id, page) )
    processMessagesOnPage(messagesOnPage, messages)
  }

  private def parseMessages(result:String): List[Map[String, Any]] = {
    Json.parse(result).asInstanceOf[List[Map[String, Any]]]
  }

  private def processMessagesOnPage(messagesOnPage:List[Map[String, Any]], messages: MutableList[Map[String, Any]]) {
    if (messagesOnPage.size > 0) {
      for (cada <- messagesOnPage) messages += cada
    }
  }

  private def requestHomeTimeLineSinceAndPage(since_id:String, page:Int): String = {
    val path = basePath+"statuses/home_timeline.json?exclude_replies=true&include_rts=true&count=200&since_id="+since_id+"&page="+page
    val request = wrapper.buildGetRequest(path, accessToken)
    val response:Response = wrapper.sendRequest( request )
    wrapper.getResponseBody(response)
  }
}