//neo4j
public void DeleteUser(UserDTO user)
{
UserDTONeo4j neo4J = new UserDTONeo4j(user.Username, user.Followers, user.Following);
_user.deleteUser(user);
_userNeo4j.DeleteUser(neo4J);
}
//neo4j
public void AddUser(UserDTO user)
{
UserDTONeo4j neo4J = new UserDTONeo4j(user.Username, user.Followers, user.Following);
_user.CreateUser(user);
_userNeo4j.CreateUser(neo4J);
}
//neo4j
public void UnfollowUser(UserDTO user, UserDTO userToFollow)
{
UserDTONeo4j neo4J = new UserDTONeo4j(user.Username, user.Followers, user.Following);
UserDTONeo4j neo4JToFollow = new UserDTONeo4j(userToFollow.Username, userToFollow.Followers, userToFollow.Following);
if (_userNeo4j.IsFollowing(neo4J, neo4JToFollow))
{
_user.unfollowUser(user, userToFollow);
_userNeo4j.DeleteRelationship(neo4J, neo4JToFollow);
}
}
//neo4j
public void FollowUser(UserDTO user, UserDTO userToFollow)
{
UserDTONeo4j neo4J = new UserDTONeo4j(user.Username, user.Followers, user.Following);
UserDTONeo4j neo4JToFollow = new UserDTONeo4j(userToFollow.Username, userToFollow.Followers, userToFollow.Following);
if (_userNeo4j.IsFollowing(neo4J, neo4JToFollow) == false)
{
_user.FollowUser(user, userToFollow);
_userNeo4j.CreateRelationship(neo4J, neo4JToFollow);
}
}
public void CreateUser(UserDTONeo4j user)
{
using (var client = new GraphClient(new Uri(_connectionString), _login, _password))
{
client.Connect();
client.Cypher.Create("(user:User { Username: {username}, Following: {following}, Followers: {followers}, })")
.WithParam("username", user.Username)
.WithParam("following", user.Following)
.WithParam("followers", user.Followers)
.ExecuteWithoutResults();
}
}
public void DeleteUser(UserDTONeo4j user)
{
using (var client = new GraphClient(new Uri(_connectionString), _login, _password))
{
client.Connect();
client.Cypher
.Match("(user1:User)-[r:Follower]-()")
.Where("user1.Username = {username}")
.WithParam("username", user.Username)
.Delete("r,user1")
.ExecuteWithoutResults();
}
}
public void DeleteRelationship(UserDTONeo4j user1, UserDTONeo4j user2)
{
using (var client = new GraphClient(new Uri(_connectionString), _login, _password))
{
client.Connect();
client.Cypher
.Match("(user1:User)-[r:Follower]-(user2:User)")
.Where("user1.Username = {username1}")
.AndWhere("user2.User_Id = {username2}")
.WithParam("username1", user1.Username)
.WithParam("username2", user2.Username)
.Delete("r")
.ExecuteWithoutResults();
}
}
//checks whether user1 follows user2 or not
public bool IsFollowing(UserDTONeo4j user1, UserDTONeo4j user2)
{
using (var client = new GraphClient(new Uri(_connectionString), _login, _password))
{
client.Connect();
var follower = client.Cypher
.Match("(user1:User)-[r:Follower]-(user2:User)")
.Where((UserDTONeo4j User1) => User1.Username == user1.Username)
.AndWhere((UserDTONeo4j User2) => User2.Username == user2.Username)
.Return(r => r.As <Follower>()).Results;
if (follower.Count() == 1)
{
return(true);
}
return(false);
}
}
//neo4j
public string RelationshipStatus(UserDTO user1, UserDTO user2)
{
UserDTONeo4j neo4J = new UserDTONeo4j(user1.Username, user1.Followers, user1.Following);
UserDTONeo4j neo4JToFollow = new UserDTONeo4j(user2.Username, user2.Followers, user2.Following);
int length = _userNeo4j.ShortestPath(neo4J.Username, neo4JToFollow.Username);
if (length == 0)
{
return("You have no mutual friends with " + neo4JToFollow.Username);
}
if (length == 1)
{
return("You are following " + neo4JToFollow.Username);
}
if (length == 2)
{
return("You have mutual friends with " + neo4JToFollow.Username);
}
else
{
return("You may have some mutual friends with " + neo4JToFollow.Username);
}
}
