/// <summary>
/// Initializes a new instance of the <see cref="FileDataContext" /> class.
/// </summary>
/// <param name="dataFileUserUrl">The data file user URL.</param>
/// <param name="dataFileTweetsUrl">The data file tweets URL.</param>
public FileDataContext(string dataFileUserUrl, string dataFileTweetsUrl)
{
try
{
// default collections
Users = new Collection<User>();
UserFollowers = new Collection<Followers>();
using (StreamReader sr = new StreamReader(dataFileUserUrl))
{
string line = string.Empty;
while ((line = sr.ReadLine()) != null)
{
// Check if user is following anyone
var indexOfFollows = line.IndexOf(" follows ");
// If nothing, take entire name or get first part of name
var userName = (indexOfFollows == -1 ? line : line.Substring(0, indexOfFollows)).Trim();
// Check if user already exists
var user = Users.Where(x => x.Name == userName).FirstOrDefault();
// Checking if user already exists
if (user == null)
{
user = new User()
{
Name = userName.Trim(),
Tweets = new Collection<Tweet>()
};
this.AddUser(userName);
}
if (indexOfFollows != -1)
{
var followers = line.Substring(indexOfFollows + 9);
var list = followers.Split(',');
foreach (var item in list)
{
var follower = Users.Where(x => x.Name == item.Trim()).FirstOrDefault();
if (follower == null)
{
follower = new User()
{
Name = item.Trim(),
Tweets = new Collection<Tweet>()
};
this.AddUser(item);
}
this.AddFollower(user, follower);
}
}
}
};
using (StreamReader sr = new StreamReader(dataFileTweetsUrl))
{
int id = 0;
string line = string.Empty;
while ((line = sr.ReadLine()) != null)
{
id++;
var userName = line.Substring(0, line.IndexOf(">"));
var message = line.Substring(line.IndexOf(">") + 1);
var user = Users.Where(x => x.Name == userName).FirstOrDefault();
// Id was used to keep track of order but an alternative is using a date field, unfortunately this was not supplied in text file
Tweet tweet = new Tweet()
{
ID = id,
Message = message,
User = user
};
user.Tweets.Add(tweet);
}
};
}
catch (Exception)
{
throw;
}
}
/// <summary>
/// Adds the user.
/// </summary>
/// <param name="name">The name.</param>
public void AddUser(string userName)
{
var user = new User()
{
Name = userName,
Tweets = new Collection<Tweet>()
};
this.Users.Add(user);
}
/// <summary>
/// Adds the user.
/// </summary>
/// <param name="user">The user.</param>
public void AddUser(User user)
{
this.Users.Add(user);
}
/// <summary>
/// Adds the follower.
/// </summary>
/// <param name="user">The user.</param>
/// <param name="follower">The follower.</param>
public void AddFollower(User user, User follower)
{
Followers fl = new Followers()
{
User = user,
FollowsUser = follower
};
UserFollowers.Add(fl);
}
