public bool DeleteUserPreference(UserPreference preference)
{
if (preference == null)
{
throw new ArgumentNullException("preference cannot be null.");
}
int nRows = _db.Delete <UserPreference>(preference._id);
return(nRows == 1);
}
public bool InsertUserPreference(UserPreference preference)
{
if (preference == null)
{
throw new ArgumentNullException("preference cannot be null.");
}
int nRows = _db.Insert(preference);
return(nRows == 1);
}
/***
* Creates a UserPreference object for a category and then inserts into the database.
* Returns true if the UserPreference was successfully added into the storage and false otherwise.
*/
public bool AddCategory(string category)
{
if (string.IsNullOrEmpty(category))
{
throw new ArgumentNullException("category cannot be null.");
}
UserPreference preference = new UserPreference(category);
CachedPreferences.Add(category, preference);
return(Storage.InsertUserPreference(preference));
}
public override bool Equals(object obj)
{
UserPreference pref = obj as UserPreference;
if (pref == null)
{
return(false);
}
return((_category == pref._category) &&
(_maxPrice == pref._maxPrice) &&
(_minPrice == pref._minPrice));
}
public bool UpdateUserPreference(UserPreference preference)
{
if (preference == null)
{
throw new ArgumentNullException("preference cannot be null.");
}
Console.WriteLine("[UpdateUserPreference] preference.id = " + preference._id);
int nRows = _db.Update(preference);
return(nRows == 1);
}
/***
* Retrieves a UserPreference object from the cache that corresponds to the filter.
* i.e filter == preference._category
*
* Parameters:
* [out] preference : UserPreference
* Returns true if a user preference object was found and false otherwise.
*/
public bool FindUserPreferenceFromCache(string filter, out UserPreference preference)
{
return(CachedPreferences.TryGetValue(filter, out preference));
}