public IQueryResult <TEntity> Write(IQuery <TEntity> query)
{
try
{
CreateIfNotExists(typeof(TEntity).Name);
lock (_lock)
{
if (query.ActionType == ActionType.Select)
{
throw new InvalidOperationException();
}
using (var transaction = new Transaction(FilePath, null))
{
Source = transaction.ReadStream();
transaction.BackUp();
}
var lines = Source.Split(Line).Where(x => x != "\r\n" && !string.IsNullOrEmpty(x)).ToArray();
if (query.ActionType == ActionType.Delete)
{
if (string.IsNullOrEmpty(Source))
{
throw new ArgumentNullException("Source");
}
if (query.Keys == null)
{
throw new ArgumentNullException("Keys");
}
Modified =
lines.Where(
x =>
query.Keys.Contains(Convert.ToInt32(x.Substring(0, x.IndexOf(Field)))) ==
false)
.ToArray();
Modified = Modified.Select(x => x + $"{Line}").ToArray();
return(new QueryResult <TEntity>()
{
IsSuccess = true,
ServiceInfo = new TransactionServiceInfo()
{
FilePath = FilePath,
Modified = Modified
}
});
}
if (query.ActionType == ActionType.Add)
{
if (query.Entities == null)
{
throw new ArgumentNullException("Entities");
}
int maxId = 0;
if (lines.Length > 0)
{
var lstLine = lines.Last();
maxId = Convert.ToInt32(lstLine.Substring(0, lstLine.IndexOf(Field)));
}
Modified = lines.Concat(_interpreter.InterpreteToString(query.Entities, maxId)).ToArray();
Modified = Modified.Select(x => x + $"{Line}").ToArray();
return(new QueryResult <TEntity>()
{
IsSuccess = true,
Result = query.Entities,
ServiceInfo = new TransactionServiceInfo()
{
FilePath = FilePath,
Modified = Modified
}
});
}
if (query.ActionType == ActionType.Update)
{
if (string.IsNullOrEmpty(Source))
{
throw new ArgumentNullException("Source");
}
if (query.Entities == null)
{
throw new ArgumentNullException("Entities");
}
var updates = _interpreter.InterpreteToString(query.Entities);
Modified = lines.ToArray();
for (int i = 0; i < Modified.Length; i++)
{
int id = Convert.ToInt32(Modified[i].Substring(0, Modified[i].IndexOf(Field)));
if (updates.ContainsKey(id))
{
Modified[i] = updates[id];
}
}
Modified = Modified.Select(x => x + $"{Line}").ToArray();
return(new QueryResult <TEntity>()
{
IsSuccess = true,
Result = query.Entities,
ServiceInfo = new TransactionServiceInfo()
{
FilePath = FilePath,
Modified = Modified
}
});
}
throw new NullReferenceException();
}
}
catch (Exception exception)
{
using (var transaction = new Transaction(FilePath, null))
{
transaction.RollBack();
}
return(new QueryResult <TEntity>()
{
IsSuccess = false,
Exception = exception,
ErrorMessage = exception.Message,
ServiceInfo = new TransactionServiceInfo()
{
FilePath = FilePath,
Modified = Modified
}
});
}
}