/// <summary>
/// Add a new entry for file. File must be saved so as to be
/// appeared under its parent directory.
/// </summary>
private SqlFile __addFile(string fileName)
{
if ((fileName = checkInvalidChars(fileName)) == null)
{
SqlFsErrCode.CurrentError = FsErr.InvalidChars;
return(null);
}
if (__isAlreadyExist(fileName))
{
SqlFsErrCode.CurrentError = FsErr.NameAlreadyExists;
return(null);
}
FsID newID = SqlFile.addFile(db, fileName, this.ID);
if (newID.compare(SqlFsConst.INVALIDID) <= 0)
{
SqlFsErrCode.CurrentError = FsErr.NoNewIDForNewFsNode;
return(null);
}
if (!updateChildList(SqlFsConst.FSOP.ADD, newID, FsID.toFsID(0)))
{
// delete entry just created
SqlFs.deleteEntryByID(db, SqlFs.DBNAMES.FsBlock.ToString(), SqlFs.FSBLOCK.fsID.ToString(), newID);
return(null);
}
SqlFile f = SqlFile.getFile(db, fsLocker, newID);
f.setDataBlockID(SqlFsConst.NOFILEDATAID);
return(f);
}
/// <summary>
/// Add an empty dir
/// </summary>
/// <returns> the newly created dir </returns>
private SqlDir __addDir(string dirName)
{
if ((dirName = checkInvalidChars(dirName)) == null)
{
SqlFsErrCode.CurrentError = FsErr.InvalidChars;
return(null);
}
if (__isAlreadyExist(dirName))
{
SqlFsErrCode.CurrentError = FsErr.NameAlreadyExists;
return(null);
}
FsID newID = SqlDir.addDir(db, dirName, this.ID);
if (newID.compare(SqlFsConst.INVALIDID) <= 0)
{
SqlFsErrCode.CurrentError = FsErr.NoNewIDForNewFsNode;
return(null);
}
if (!updateChildList(SqlFsConst.FSOP.ADD, newID, FsID.toFsID(0)))
{
// delete entry just created
SqlFs.deleteEntryByID(db, SqlFs.DBNAMES.FsBlock.ToString(), SqlFs.FSBLOCK.fsID.ToString(), newID);
return(null);
}
return(SqlDir.getDir(db, fsLocker, newID));
}
/// <summary>
/// Use a function to get ID since length of ID may be changed in future
/// </summary>
internal static FsID getID(Cursor cur, int index)
{
if (FsID.LongID)
{
return(FsID.toFsID(cur.getLong(index)));
}
return(FsID.toFsID(cur.getInt(index)));
}
/// <summary>
/// Move itself to a destination dir
/// </summary>
private bool __move(SqlDir destDir)
{
do
{
if (this.ID.Equals(SqlFsConst.ROOTDIRID)) // can't move root
{
SqlFsErrCode.CurrentError = FsErr.CannotMoveRoot;
break;
}
if (this.ID.Equals(destDir.ID)) // can't move to itself
{
SqlFsErrCode.CurrentError = FsErr.CannotMoveToSelf;
break;
}
if (this.Dir && destDir.isAncestor((SqlDir)this)) // if it is a DIR, can't move to its subdir
{
SqlFsErrCode.CurrentError = FsErr.CannotMoveToSubdir;
break;
}
if (destDir.isAlreadyExist(this.Name)) // can't move if there is one with the same name
{
SqlFsErrCode.CurrentError = FsErr.NameAlreadyExists;
break;
}
// unlink itself from parent
SqlDir parent = this.Parent;
if (parent == null)
{
SqlFsErrCode.CurrentError = FsErr.NoParent;
break;
}
if (!parent.updateChildList(SqlFsConst.FSOP.DEL, this.ID, FsID.toFsID(0)))
{
break;
}
// update parent ID
if (!setField(SqlFs.FSBLOCK.fsParent, destDir.ID))
{
break;
}
// add itself to dest dir
if (!destDir.updateChildList(SqlFsConst.FSOP.ADD, this.ID, FsID.toFsID(0)))
{
break;
}
return(true);
} while (false);
return(false);
}
/// <summary>
/// delete all dirs and files recursively
/// </summary>
private bool __delete()
{
bool isOK = false;
do
{
// delete itself from parent
if (!this.ID.Equals(SqlFsConst.ROOTDIRID)) // root has no parent
{
SqlDir parent = this.Parent;
if (parent == null)
{
SqlFsErrCode.CurrentError = FsErr.NoParent;
break;
}
if (!parent.updateChildList(SqlFsConst.FSOP.DEL, this.ID, FsID.toFsID(0)))
{
break;
}
}
// delete underlying subdirs and files
List <SqlFsNode> childList = this.ChildList;
if (childList != null)
{
// delete children one by one
foreach (SqlFsNode fsNode in childList)
{
fsNode.delete();
}
}
// delete itself
if (this.ID.Equals(SqlFsConst.ROOTDIRID))
{
// for root, just clear all children
this.setField(SqlFs.FSBLOCK.fsChild, null);
}
else
{
if (!SqlFs.deleteEntryByID(db, SqlFs.DBNAMES.FsBlock.ToString(), SqlFs.FSBLOCK.fsID.ToString(), this.ID))
{
SqlFsErrCode.CurrentError = FsErr.CannotDeleteFsEntry;
break;
}
}
isOK = true;
} while (false);
return(isOK);
}
private bool __delete()
{
bool isOK = false;
do
{
// delete itself from parent
SqlDir parent = this.Parent;
if (parent == null)
{
SqlFsErrCode.CurrentError = FsErr.NoParent;
break;
}
if (!parent.updateChildList(SqlFsConst.FSOP.DEL, this.ID, FsID.toFsID(0)))
{
break;
}
// delete entry in data block table
FsID dataBlockID = this.getDataBlockID();
if (dataBlockID.compare(SqlFsConst.INVALIDID) <= 0)
{
//SqlFsLog.debug("+++ dataBlockID = " + dataBlockID.getVal());
SqlFsErrCode.CurrentError = FsErr.DataBlockIDNotValid;
break;
}
if (!SqlFs.deleteEntryByID(db, IFileData.DTABLENAME, IFileData.IDCOL, dataBlockID))
{
SqlFsErrCode.CurrentError = FsErr.CannotDeleteDataBlockEntry;
break;
}
// delete its own entry
if (!SqlFs.deleteEntryByID(db, SqlFs.DBNAMES.FsBlock.ToString(), SqlFs.FSBLOCK.fsID.ToString(), this.ID))
{
SqlFsErrCode.CurrentError = FsErr.CannotDeleteFsEntry;
break;
}
isOK = true;
} while (false);
return(isOK);
}