/// <summary>
/// Get successor or predecessor of this folder at the same level of the folders hierarchy
/// </summary>
/// <param name="backwards">
/// <see langword="true"/> for predecessor
/// <see langword="false"/> for successor
/// </param>
/// <returns>
/// <see langword="null"/> if none exist
/// </returns>
public IDataFolder GetNextSiblingInTree(bool backwards)
{
Check.RequireLambda(!IsVirtualRoot, () => new InvalidOperationException(StorageResources.VirtualRootInvalidOperation));
IDataFolder retval = ParentDataFolder.GetNextChild(this, backwards);
if (null == retval)
{
if (!ParentDataFolder.IsVirtualRoot)
{
for (
IDataFolder nst = ParentDataFolder.GetNextSiblingInTree(backwards);
nst != null && retval == null;
nst = nst.GetNextSiblingInTree(backwards))
{
retval = nst.GetFirstChildFolder(backwards);
}
}
}
return(retval);
}
/// <summary>
/// Get next data file in the same repo folder.
/// </summary>
/// <param name="backwards">
/// The direction in which to look for data file relative to this file: to the past or to the future
/// </param>
/// <returns>
/// Next data file or <see langword="null"/> if none exists.
/// </returns>
public IRepositoryFile GetNext(bool backwards)
{
IRepositoryFile retval = null;
IRepositoryFileName fileInSameFolder = ContainingFolder.GetNextDataFile(this.Name, backwards);
if (null != fileInSameFolder)
{
retval = new RepositoryFile(containingFolder: ContainingFolder, fileName: fileInSameFolder);
}
else
{
// scanning sibling leaf folders until first data file is found
for (
IDataFolder nextFolder = ContainingFolder.GetNextSiblingInTree(backwards);
nextFolder != null && retval == null;
nextFolder = nextFolder.GetNextSiblingInTree(backwards))
{
retval = nextFolder.FindFirstDataFile(backwards);
}
}
return(retval);
}
