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package com.tedneward.scitter
{
  import org.apache.commons.httpclient._, auth._, methods._, params._
  import scala.xml._

  /**
   * Status message type. This will typically be the most common message type
   * sent back from Twitter (usually in some kind of collection form). Note
   * that all optional elements in the Status type are represented by the
   * Scala Option[T] type, since that's what it's there for.
   */
  abstract class Status
  {
    /**
     * Nested User type. This could be combined with the top-level User type,
     * if we decide later that it's OK for this to have a boatload of optional
     * elements, including the most-recently-posted status update (which is a
     * tad circular).
     */
    abstract class User
    {
      val id : Long
      val name : String
      val screenName : String
      val description : String
      val location : String
      val profileImageUrl : String
      val url : String
      val protectedUpdates : Boolean
      val followersCount : Int
    }
    /**
     * Object wrapper for transforming (format) into User instances.
     */
    object User
    {
      /*
      def fromAtom(node : Node) : Status =
      {
      
      }
      */
      /*
      def fromRss(node : Node) : Status =
      {
      
      }
      */
      def fromXml(node : Node) : User =
      {
        new User {
          val id = (node \ "id").text.toLong
          val name = (node \ "name").text
          val screenName = (node \ "screen_name").text
          val description = (node \ "description").text
          val location = (node \ "location").text
          val profileImageUrl = (node \ "profile_image_url").text
          val url = (node \ "url").text
          val protectedUpdates = (node \ "protected").text.toBoolean
          val followersCount = (node \ "followers_count").text.toInt
        }
      }
    }
  
    val createdAt : String
    val id : Long
    val text : String
    val source : String
    val truncated : Boolean
    val inReplyToStatusId : Option[Long]
    val inReplyToUserId : Option[Long]
    val favorited : Boolean
    val user : User
  }
  /**
   * Object wrapper for transforming (format) into Status instances.
   */
  object Status
  {
    /*
    def fromAtom(node : Node) : Status =
    {
    
    }
    */
    /*
    def fromRss(node : Node) : Status =
    {
    
    }
    */
    def fromXml(node : Node) : Status =
    {
      new Status {
        val createdAt = (node \ "created_at").text
        val id = (node \ "id").text.toLong
        val text = (node \ "text").text
        val source = (node \ "source").text
        val truncated = (node \ "truncated").text.toBoolean
        val inReplyToStatusId =
          if ((node \ "in_reply_to_status_id").text != "")
            Some((node \"in_reply_to_status_id").text.toLong)
          else
            None
        val inReplyToUserId = 
          if ((node \ "in_reply_to_user_id").text != "")
            Some((node \"in_reply_to_user_id").text.toLong)
          else
            None
        val favorited = (node \ "favorited").text.toBoolean
        val user = User.fromXml((node \ "user")(0))
      }
    }
  }


  /**
   * Object for consuming "non-specific" Twitter feeds, such as the public timeline.
   * Use this to do non-authenticated requests of Twitter feeds.
   */
  object Scitter
  {
    /**
     * Ping the server to see if it's up and running.
     *
     * Twitter docs say:
     * test
     * Returns the string "ok" in the requested format with a 200 OK HTTP status code.
     * URL: http://twitter.com/help/test.format
     * Formats: xml, json
     * Method(s): GET
     */
    def test : Boolean =
    {
      val client = new HttpClient()

      val method = new GetMethod("http://twitter.com/help/test.xml")

      method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, 
        new DefaultHttpMethodRetryHandler(3, false))

      client.executeMethod(method)
      
      val statusLine = method.getStatusLine()
      statusLine.getStatusCode() == 200
    }
    /**
     * Query the public timeline for the most recent statuses.
     *
     * Twitter docs say:
     * public_timeline
     * Returns the 20 most recent statuses from non-protected users who have set
     * a custom user icon.  Does not require authentication.  Note that the
     * public timeline is cached for 60 seconds so requesting it more often than
     * that is a waste of resources.
     * URL: http://twitter.com/statuses/public_timeline.format
     * Formats: xml, json, rss, atom
     * Method(s): GET
     * API limit: Not applicable
     * Returns: list of status elements     
     */
    def publicTimeline : List[Status] =
    {
      import scala.collection.mutable.ListBuffer
    
      val client = new HttpClient()

      val method = new GetMethod("http://twitter.com/statuses/public_timeline.xml")

      method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, 
        new DefaultHttpMethodRetryHandler(3, false))

      client.executeMethod(method)
      
      val statusLine = method.getStatusLine()
      if (statusLine.getStatusCode() == 200)
      {
        val responseXML =
          XML.loadString(method.getResponseBodyAsString())

        val statusListBuffer = new ListBuffer[Status]

        for (n <- (responseXML \\ "status").elements)
          statusListBuffer += (Status.fromXml(n))
        
        statusListBuffer.toList
      }
      else
      {
        Nil
      }
    }
  }
  /**
   * Class for consuming "authenticated user" Twitter APIs. Each instance is
   * thus "tied" to a particular authenticated user on Twitter, and will
   * behave accordingly (according to the Twitter API documentation).
   */
  class Scitter(username : String, password : String)
  {
    /**
     * Verify the user credentials against Twitter.
     *
     * Twitter docs say:
     * verify_credentials
     * Returns an HTTP 200 OK response code and a representation of the
     * requesting user if authentication was successful; returns a 401 status
     * code and an error message if not.  Use this method to test if supplied
     * user credentials are valid.
     * URL: http://twitter.com/account/verify_credentials.format
     * Formats: xml, json
     * Method(s): GET
     */
    def verifyCredentials : Boolean =
    {
      val client = new HttpClient()

      val method = new GetMethod("http://twitter.com/help/test.xml")

      method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, 
        new DefaultHttpMethodRetryHandler(3, false))
        
      client.getParams().setAuthenticationPreemptive(true)
      val creds = new UsernamePasswordCredentials(username, password)
      client.getState().setCredentials(
        new AuthScope("twitter.com", 80, AuthScope.ANY_REALM), creds)

      client.executeMethod(method)
      
      val statusLine = method.getStatusLine()
      statusLine.getStatusCode() == 200
    }
  }
}

				
package com.tedneward.scitter
{
  // ...
  object Scitter
  {
    // ...
    private[scitter] def exec ute(url : String) =
    {
      val client = new HttpClient()
      val method = new GetMethod(url)
      
      method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, 
        new DefaultHttpMethodRetryHandler(3, false))
        
      client.executeMethod(method)
      
      (method.getStatusLine().getStatusCode(), method.getResponseBodyAsString())
    }
  }
}

				
package com.tedneward.scitter
{
  // ...
  object Scitter
  {
    /**
     * Ping the server to see if it's up and running.
     *
     * Twitter docs say:
     * test
     * Returns the string "ok" in the requested format with a 200 OK HTTP status code.
     * URL: http://twitter.com/help/test.format
     * Formats: xml, json
     * Method(s): GET
     */
    def test : Boolean =
    {
      val (statusCode, statusBody) =
        execute("http://twitter.com/statuses/public_timeline.xml")
      statusCode == 200
    }
  }
}

				
package com.tedneward.scitter
{
  // ...
  object Scitter
  {
    // ...
    private[scitter] def execute(url : String, username : String, password : String) =
    {
      val client = new HttpClient()
      val method = new GetMethod(url)
      
      method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, 
        new DefaultHttpMethodRetryHandler(3, false))
        
	  client.getParams().setAuthenticationPreemptive(true)
	  client.getState().setCredentials(
		new AuthScope("twitter.com", 80, AuthScope.ANY_REALM),
		  new UsernamePasswordCredentials(username, password))
      
      client.executeMethod(method)
      
      (method.getStatusLine().getStatusCode(), method.getResponseBodyAsString())
    }
  }
}

				
package com.tedneward.scitter
{
  // ...
  object Scitter
  {
    // ...
    private[scitter] def execute(url : String) : (Int, String) =
	  execute(url, "", "")
    private[scitter] def execute(url : String, username : String, password : String) =
    {
      val client = new HttpClient()
      val method = new GetMethod(url)
      
      method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, 
        new DefaultHttpMethodRetryHandler(3, false))
        
      if ((username != "") && (password != ""))
      {
        client.getParams().setAuthenticationPreemptive(true)
        client.getState().setCredentials(
          new AuthScope("twitter.com", 80, AuthScope.ANY_REALM),
            new UsernamePasswordCredentials(username, password))
      }
      
      client.executeMethod(method)
      
      (method.getStatusLine().getStatusCode(), method.getResponseBodyAsString())
    }
  }
}

				
package com.tedneward.scitter
{
  class Scitter
  {
    def friendsTimeline : List[Status] =
    {
      val (statusCode, statusBody) =
       Scitter.execute("http://twitter.com/statuses/friends_timeline.xml",
                        username, password)

      if (statusCode == 200)
      {
        val responseXML = XML.loadString(statusBody)

        val statusListBuffer = new ListBuffer[Status]

        for (n <- (responseXML \\ "status").elements)
          statusListBuffer += (Status.fromXml(n))
        
        statusListBuffer.toList
      }
      else
      {
        Nil
      }
    }
  }
}

				
package com.tedneward.scitter.test
{
  class ScitterTests
  {
    // ...
	
    @Test def scitterFriendsTimeline =
    {
      val scitter = new Scitter(testUser, testPassword)
      val result = scitter.friendsTimeline
      assertTrue(result.length > 0)
    }
  }
}

				
package com.tedneward.scitter
{
  // ...
  
  abstract class OptionalParam
  case class Id(id : String) extends OptionalParam
  case class UserId(id : Long) extends OptionalParam
  case class Since(since_id : Long) extends OptionalParam
  case class Max(max_id : Long) extends OptionalParam
  case class Count(count : Int) extends OptionalParam
  case class Page(page : Int) extends OptionalParam
  
  class Scitter(username : String, password : String)
  {
    // ...
	
    def friendsTimeline(options : OptionalParam*) : List[Status] =
    {
      val optionsStr =
        new StringBuffer("http://twitter.com/statuses/friends_timeline.xml?")
      for (option <- options)
      {
        option match
        {
          case Since(since_id) =>
            optionsStr.append("since_id=" + since_id.toString() + "&")
          case Max(max_id) =>
            optionsStr.append("max_id=" + max_id.toString() + "&")
          case Count(count) =>
            optionsStr.append("count=" + count.toString() + "&")
          case Page(page) =>
            optionsStr.append("page=" + page.toString() + "&")
        }
      }
      
      val (statusCode, statusBody) =
        Scitter.execute(optionsStr.toString(), username, password)
      if (statusCode == 200)
      {
        val responseXML = XML.loadString(statusBody)

        val statusListBuffer = new ListBuffer[Status]

        for (n <- (responseXML \\ "status").elements)
          statusListBuffer += (Status.fromXml(n))
        
        statusListBuffer.toList
      }
      else
      {
        Nil
      }
    }
  }
}

				
package com.tedneward.scitter.test
{
  class ScitterTests
  {
    // ...
	
    @Test def scitterFriendsTimelineWithCount =
    {
      val scitter = new Scitter(testUser, testPassword)
      val result = scitter.friendsTimeline(Count(5))
      assertTrue(result.length == 5)
    }
  }
}

				
C:\>javap -classpath classes com.tedneward.scitter.Scitter
Compiled from "scitter.scala"
public class com.tedneward.scitter.Scitter extends java.lang.Object implements s
cala.ScalaObject{
    public com.tedneward.scitter.Scitter(java.lang.String, java.lang.String);
    public scala.List friendsTimeline(scala.Seq);
    public boolean verifyCredentials();
    public int $tag()       throws java.rmi.RemoteException;
}

				
package com.tedneward.scitter.test;

import org.junit.*;
import com.tedneward.scitter.*;

public class JavaScitterTests
{
  public static final String testUser = "TESTUSER";
  public static final String testPassword = "TESTPASSWORD";
  
  @Test public void getFriendsStatuses()
  {
    Scitter scitter = new Scitter(testUser, testPassword);
    if (scitter.verifyCredentials())
    {
      scala.List statuses =
        scitter.friendsTimeline(new scala.collection.mutable.ListBuffer());
      Assert.assertTrue(statuses.length() > 0);
    }
    else
      Assert.assertTrue(false);
  }
}

				
package com.tedneward.scitter.test;

import org.junit.*;
import com.tedneward.scitter.*;

public class JavaScitterTests
{
  public static final String testUser = "TESTUSER";
  public static final String testPassword = "TESTPASSWORD";

  @Test public void getFriendsStatuses()
  {
    Scitter scitter = new Scitter(testUser, testPassword);
    if (scitter.verifyCredentials())
    {
      scala.List statuses =
        scitter.friendsTimeline(new scala.collection.mutable.ListBuffer());
      Assert.assertTrue(statuses.length() > 0);
      
      for (int i=0; i
     

				
package com.tedneward.scitter.test;

import org.junit.*;
import com.tedneward.scitter.*;

public class JavaScitterTests
{
  public static final String testUser = "TESTUSER";
  public static final String testPassword = "TESTPASSWORD";
  
  // ...

  @Test public void getFriendsStatusesWithCount()
  {
    Scitter scitter = new Scitter(testUser, testPassword);
    if (scitter.verifyCredentials())
    {
      scala.collection.mutable.ListBuffer params =
        new scala.collection.mutable.ListBuffer();
      params.$plus$eq(new Count(5));
      
      scala.List statuses = scitter.friendsTimeline(params);

      Assert.assertTrue(statuses.length() > 0);
      Assert.assertTrue(statuses.length() == 5);
      
      for (int i=0; i