/// <summary>
/// Remove an entry from the current storage and compound file.
/// </summary>
/// <param name="entryName">The name of the entry in the current storage to delete</param>
/// <example>
/// <code>
/// cf = new CompoundFile("A_FILE_YOU_CAN_CHANGE.cfs", UpdateMode.Update, true, false);
/// cf.RootStorage.Delete("AStream"); // AStream item is assumed to exist.
/// cf.Commit(true);
/// cf.Close();
/// </code>
/// </example>
/// <exception cref="T:OpenMcdf.CFDisposedException">Raised if trying to delete item from a closed compound file</exception>
/// <exception cref="T:OpenMcdf.CFItemNotFound">Raised if item to delete is not found</exception>
/// <exception cref="T:OpenMcdf.CFException">Raised if trying to delete root storage</exception>
public void Delete(String entryName)
{
CheckDisposed();
// Find entry to delete
IDirectoryEntry tmp = DirectoryEntry.Mock(entryName, StgType.StgInvalid);
IRBNode foundObj = null;
this.Children.TryLookup(tmp, out foundObj);
if (foundObj == null)
{
throw new CFItemNotFound("Entry named [" + entryName + "] was not found");
}
//if (foundObj.GetType() != typeCheck)
// throw new CFException("Entry named [" + entryName + "] has not the correct type");
if (((IDirectoryEntry)foundObj).StgType == StgType.StgRoot)
{
throw new CFException("Root storage cannot be removed");
}
IRBNode altDel = null;
switch (((IDirectoryEntry)foundObj).StgType)
{
case StgType.StgStorage:
CFStorage temp = new CFStorage(this.CompoundFile, ((IDirectoryEntry)foundObj));
// This is a storage. we have to remove children items first
foreach (IRBNode de in temp.Children)
{
IDirectoryEntry ded = de as IDirectoryEntry;
temp.Delete(ded.Name);
}
// ...then we need to rethread the root of siblings tree...
if (this.Children.Root != null)
{
this.DirEntry.Child = (this.Children.Root as IDirectoryEntry).SID;
}
else
{
this.DirEntry.Child = DirectoryEntry.NOSTREAM;
}
// ...and finally Remove storage item from children tree...
this.Children.Delete(foundObj, out altDel);
// ...and remove directory (storage) entry
if (altDel != null)
{
foundObj = altDel;
}
this.CompoundFile.InvalidateDirectoryEntry(((IDirectoryEntry)foundObj).SID);
break;
case StgType.StgStream:
// Free directory associated data stream.
CompoundFile.FreeAssociatedData((foundObj as IDirectoryEntry).SID);
// Remove item from children tree
this.Children.Delete(foundObj, out altDel);
// Rethread the root of siblings tree...
if (this.Children.Root != null)
{
this.DirEntry.Child = (this.Children.Root as IDirectoryEntry).SID;
}
else
{
this.DirEntry.Child = DirectoryEntry.NOSTREAM;
}
// Delete operation could possibly have cloned a directory, changing its SID.
// Invalidate the ACTUALLY deleted directory.
if (altDel != null)
{
foundObj = altDel;
}
this.CompoundFile.InvalidateDirectoryEntry(((IDirectoryEntry)foundObj).SID);
break;
}
//// Refresh recursively all SIDs (invariant for tree sorting)
//VisitedEntryAction action = delegate(CFSItem target)
//{
// if( ((IDirectoryEntry)target).SID>foundObj.SID )
// {
// ((IDirectoryEntry)target).SID--;
// }
// ((IDirectoryEntry)target).LeftSibling--;
//};
}
/// <summary>
/// Remove an entry from the current storage and compound file.
/// </summary>
/// <param name="entryName">The name of the entry in the current storage to delete</param>
/// <example>
/// <code>
/// cf = new CompoundFile("A_FILE_YOU_CAN_CHANGE.cfs", UpdateMode.Update, true, false);
/// cf.RootStorage.Delete("AStream"); // AStream item is assumed to exist.
/// cf.Commit(true);
/// cf.Close();
/// </code>
/// </example>
/// <exception cref="T:OpenMcdf.CFDisposedException">Raised if trying to delete item from a closed compound file</exception>
/// <exception cref="T:OpenMcdf.CFItemNotFound">Raised if item to delete is not found</exception>
/// <exception cref="T:OpenMcdf.CFException">Raised if trying to delete root storage</exception>
public void Delete(string entryName)
{
CheckDisposed();
// Find entry to delete
var tmp = DirectoryEntry.Mock(entryName, StgType.StgInvalid);
Children.TryLookup(tmp, out var foundObj);
if (foundObj == null)
{
throw new CFItemNotFound("Entry named [" + entryName + "] was not found");
}
if (((IDirectoryEntry)foundObj).StgType == StgType.StgRoot)
{
throw new CFException("Root storage cannot be removed");
}
IRbNode altDel;
// ReSharper disable once SwitchStatementMissingSomeCases
switch (((IDirectoryEntry)foundObj).StgType)
{
case StgType.StgStorage:
var temp = new CFStorage(CompoundFile, ((IDirectoryEntry)foundObj));
// This is a storage. we have to remove children items first
foreach (var de in temp.Children)
{
if (de is IDirectoryEntry ded)
{
temp.Delete(ded.Name);
}
}
// ...then we need to re-thread the root of siblings tree...
DirEntry.Child = (Children.Root as IDirectoryEntry)?.SID ?? DirectoryEntry.nostream;
// ...and finally Remove storage item from children tree...
Children.Delete(foundObj, out altDel);
// ...and remove directory (storage) entry
if (altDel != null)
{
foundObj = altDel;
}
CompoundFile.InvalidateDirectoryEntry(((IDirectoryEntry)foundObj).SID);
break;
case StgType.StgStream:
// Free directory associated data stream.
CompoundFile.FreeAssociatedData((foundObj as IDirectoryEntry).SID);
// Remove item from children tree
Children.Delete(foundObj, out altDel);
// Re-thread the root of siblings tree...
DirEntry.Child = (Children.Root as IDirectoryEntry)?.SID ?? DirectoryEntry.nostream;
// Delete operation could possibly have cloned a directory, changing its SID.
// Invalidate the ACTUALLY deleted directory.
if (altDel != null)
{
foundObj = altDel;
}
CompoundFile.InvalidateDirectoryEntry(((IDirectoryEntry)foundObj).SID);
break;
}
}
