/// <summary>Change the layer id of this directory</summary>
/// <param name="trans">Transaction to use for the operation</param>
/// <param name="newLayer">New layer id of this directory</param>
public async Task <FdbDirectorySubspace> ChangeLayerAsync(IFdbTransaction trans, string newLayer)
{
Contract.NotNull(trans, nameof(trans));
Contract.NotNull(newLayer, nameof(newLayer));
var descriptor = this.Descriptor;
if (descriptor.Path.Count == 0)
{ // cannot change the layer of the root of a directory layer
throw ThrowHelper.InvalidOperationException("Cannot change the layer id of the root of a directory layer or partition.");
}
if (descriptor.Layer == FdbDirectoryPartition.LayerId)
{ // cannot change a partition back to a regular directory
throw ThrowHelper.InvalidOperationException("Cannot change the layer id of a directory partition.");
}
if (newLayer == FdbDirectoryPartition.LayerId)
{ // cannot change a regular directory into a new partition
//REVIEW: or maybe we can? This would only be possible if this directory does not contain any sub-directory
throw ThrowHelper.InvalidOperationException("Cannot transform a regular directory into a partition.");
}
EnsureIsValid();
// set the layer to the new value
var metadata = await this.DirectoryLayer.Resolve(trans);
await metadata.ChangeLayerInternalAsync(trans, descriptor.Path, newLayer).ConfigureAwait(false);
// and return the new version of the subspace
var changed = new FdbDirectoryLayer.DirectoryDescriptor(descriptor.DirectoryLayer, descriptor.Path, descriptor.Prefix, newLayer, descriptor.Partition, descriptor.ValidationChain);
return(new FdbDirectorySubspace(changed, this.KeyEncoder, this.Context));
}
internal FdbDirectorySubspace(FdbDirectoryLayer.DirectoryDescriptor descriptor, IDynamicKeyEncoder encoder, ISubspaceContext?context, bool cached)
: base(descriptor.Prefix, encoder, context ?? SubspaceContext.Default)
{
Contract.Debug.Requires(descriptor?.Partition != null);
this.Descriptor = descriptor;
this.Cached = cached;
}
internal static FdbDirectoryLayer.DirectoryDescriptor MakePartition(FdbDirectoryLayer.DirectoryDescriptor descriptor)
{
var partition = new FdbDirectoryLayer.PartitionDescriptor(descriptor.Path, KeySubspace.CreateDynamic(descriptor.Prefix), descriptor.Partition);
return(new FdbDirectoryLayer.DirectoryDescriptor(descriptor.DirectoryLayer, descriptor.Path, descriptor.Prefix, descriptor.Layer, partition, descriptor.ValidationChain));
}
internal FdbDirectoryPartition(FdbDirectoryLayer.DirectoryDescriptor descriptor, FdbDirectoryLayer.PartitionDescriptor parent, IDynamicKeyEncoder keyEncoder, ISubspaceContext?context)
: base(descriptor, keyEncoder, context)
{
Contract.NotNull(parent, nameof(parent));
this.Parent = parent;
}
