/// <summary>
/// Rename a collection (do not support transactions)
/// </summary>
public bool RenameCollection(string collection, string newName)
{
if (collection.IsNullOrWhiteSpace())
{
throw new ArgumentNullException(nameof(collection));
}
if (newName.IsNullOrWhiteSpace())
{
throw new ArgumentNullException(nameof(newName));
}
// rename collection is possible only in exclusive transaction for this
if (_locker.IsInTransaction)
{
throw LiteException.AlreadyExistsTransaction();
}
// check for collection name
if (collection.Equals(newName, StringComparison.OrdinalIgnoreCase))
{
throw LiteException.InvalidCollectionName(newName, "New name must be different from current name");
}
// checks if newName are compatible
CollectionService.CheckName(newName, _header);
// rename collection is possible only in exclusive transaction for this
if (_locker.IsInTransaction)
{
throw LiteException.AlreadyExistsTransaction();
}
return(this.AutoTransaction(transaction =>
{
var currentSnapshot = transaction.CreateSnapshot(LockMode.Write, collection, false);
var newSnapshot = transaction.CreateSnapshot(LockMode.Write, newName, false);
if (currentSnapshot.CollectionPage == null)
{
return false;
}
// checks if do not already exists this collection name
if (_header.GetCollectionPageID(newName) != uint.MaxValue)
{
throw LiteException.AlreadyExistsCollectionName(newName);
}
// rename collection and set page as dirty (there is no need to set IsDirty in HeaderPage)
transaction.Pages.Commit += (h) =>
{
h.RenameCollection(collection, newName);
};
return true;
}));
}
/// <summary>
/// Rename a collection (do not support transactions)
/// </summary>
public bool RenameCollection(string collection, string newName)
{
if (collection.IsNullOrWhiteSpace())
{
throw new ArgumentNullException(nameof(collection));
}
if (newName.IsNullOrWhiteSpace())
{
throw new ArgumentNullException(nameof(newName));
}
if (collection.Equals(newName, StringComparison.OrdinalIgnoreCase))
{
throw new ArgumentException("To rename a collection the new name must be different from current collection name");
}
// rename collection is possible only in exclusive transaction for this
if (_locker.IsInTransaction)
{
throw LiteException.AlreadyExistsTransaction();
}
return(this.AutoTransaction(transaction =>
{
var currentSnapshot = transaction.CreateSnapshot(LockMode.Write, collection, false);
var newSnapshot = transaction.CreateSnapshot(LockMode.Write, newName, false);
if (currentSnapshot.CollectionPage == null)
{
return false;
}
var diff = Encoding.UTF8.GetByteCount(newName) - Encoding.UTF8.GetByteCount(collection);
// check if new size fit on header page
if (diff > 0 && diff > _header.GetAvaiableCollectionSpace())
{
throw new LiteException(0, "This is no space to rename this collection");
}
// checks if do not already exists this collection name
if (_header.GetCollectionPageID(newName) != uint.MaxValue)
{
throw LiteException.AlreadyExistsCollectionName(newName);
}
// rename collection and set page as dirty (there is no need to set IsDirty in HeaderPage)
transaction.Pages.Commit += (h) =>
{
h.RenameCollection(collection, newName);
};
return true;
}));
}