Android Open Source - WhatsUp Session Handler

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License

The source code is released under:
GNU General Public License
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Java Source Code

package nu.placebo.whatsup.ctrl;
/*w ww . j  a  v  a2 s  . c o m*/
import java.util.Observable;

import nu.placebo.whatsup.constants.Constants;
import nu.placebo.whatsup.model.SessionInfo;
import nu.placebo.whatsup.network.Action;
import nu.placebo.whatsup.network.Login;
import nu.placebo.whatsup.network.NetworkOperationListener;
import nu.placebo.whatsup.network.NetworkTask;
import nu.placebo.whatsup.network.OperationResult;
import nu.placebo.whatsup.network.SessionTest;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.util.Log;
import android.widget.Toast;

/**
 * 
 * Stores session data and handles automatic log in and log off.
 * 
 */

public class SessionHandler extends Observable implements NetworkOperationListener<SessionInfo> {

  private static SessionHandler instance;
  private static Context context;
  private String userName;
  private String password;
  private String sessionName;
  private String sessionId;
  private boolean loggedIn = false;

  private SessionHandler() {
    this.read();
  }

  public void testSession() {
    if (this.hasSession()) {
      SessionTest ts = new SessionTest(new SessionInfo(this.sessionName,
          this.sessionId));
      ts.addOperationListener(this);
      new NetworkTask<SessionInfo>().execute(ts);
    } else {
      Log.w("WhatsUp", "No session to test.");
    }
  }

  public boolean hasSession() {
    return this.sessionId != null && this.sessionName != null;
  }

  public static SessionHandler getInstance(Context c) {
    if (instance == null) {
      context = c;
      instance = new SessionHandler();
    }
    return instance;
  }

  public void saveCredentials(String userName, String password) {
    this.userName = userName;
    this.password = password;
    this.write();
    this.setChanged();
    this.notifyObservers();
  }

  public void saveSession(SessionInfo sessionInfo) {
    this.sessionName = sessionInfo.getSessionName();
    this.sessionId = sessionInfo.getSessionId();
    this.write();
    this.setChanged();
    this.notifyObservers();
  }

  public SessionInfo getSession() {
    return new SessionInfo(this.sessionName, this.sessionId);
  }

  public String getUserName() {
    return this.userName;
  }

  private void write() {
    Editor editor = context.getSharedPreferences(
        Constants.PREFERENCES_FILE, Context.MODE_PRIVATE).edit();
    editor.putString("userName", this.userName);
    editor.putString("password", this.password);
    editor.putString("sessionName", this.sessionName);
    editor.putString("sessionId", this.sessionId);
    editor.commit();
  }

  private void read() {
    SharedPreferences prefs = context.getSharedPreferences(
        Constants.PREFERENCES_FILE, Context.MODE_PRIVATE);
    this.userName = prefs.getString("userName", null);
    this.password = prefs.getString("password", null);
    this.sessionName = prefs.getString("sessionName", null);
    this.sessionId = prefs.getString("sessionId", null);
  }

  public void operationExcecuted(OperationResult<SessionInfo> result) {
    if (result.getAction() == Action.LOG_IN && !result.hasErrors()) {
      this.saveSession(result.getResult());
      Toast.makeText(context, "Logged in", Toast.LENGTH_SHORT).show();
      this.loggedIn = true;
      this.setChanged();
    } else if (result.getAction() == Action.TEST_SESSION) {
      if (!result.hasErrors()){
        Toast.makeText(context, "Logged in", Toast.LENGTH_SHORT).show();
        this.loggedIn = true;
        this.setChanged();
      } else if (result.hasErrors() && this.hasCredentials()) {
        this.login();
        Log.w("WhatsUp", "Trying to log in");
      }
    }
    Log.w("WhatsUp", "Stuff");
  }

  public void login() {
    Login logIn = new Login(this.userName, this.password);
    logIn.addOperationListener(this);
    new NetworkTask<SessionInfo>().execute(logIn);
    Log.w("WhatsUp", "Trying to log in");
  }

  public boolean hasCredentials() {
    return this.userName != null && this.password != null;
  }

  public void logOut() {
    this.saveSession(new SessionInfo(null, null));
    this.loggedIn = false;
    // TODO Actually log out from the server.
    Toast.makeText(context, "Logged out", Toast.LENGTH_SHORT);
  }
  
  public boolean isLoggedIn() {
    return this.loggedIn;
  }

  public void reset() {
    this.saveCredentials(null, null);
    this.saveSession(new SessionInfo(null, null));
    this.deleteObservers();
  }
}
Java Source Code List
