/// <summary>
/// Don't call any of the above when this one is called
/// </summary>
internal static void close(SqlFsLocker locker)
{
lock (typeof(SqlFsLocker))
{
if (lockerTable == null)
{
return;
}
string tableKey = locker.TableKey;
int? count = refCountTable[tableKey];
if (count == null)
{
return;
}
int newCount = (int)count - 1;
if (newCount == 0)
{
// remove all references
lockerTable.Remove(tableKey);
refCountTable.Remove(tableKey);
locker.close();
}
else
{
// decrease reference count by 1
refCountTable[tableKey] = newCount;
}
}
}
/// <summary>
/// Get/create a named lock based on 'dbFullPath'
/// Same 'dbFullPath' will get the same lock
///
/// </summary>
internal static SqlFsLocker getFsLocker(string dbFullPath)
{
lock (typeof(SqlFsLocker))
{
if (lockerTable == null)
{
lockerTable = new Dictionary <string, SqlFsLocker>();
}
if (refCountTable == null)
{
refCountTable = new Dictionary <string, int?>();
}
string tableKey = SqlFsFunc.genHash(dbFullPath);
SqlFsLocker locker = lockerTable[tableKey];
if (locker == null)
{
locker = new SqlFsLocker(tableKey);
lockerTable[tableKey] = locker;
refCountTable[tableKey] = 1; // reference count 1
}
else
{
// increase reference count by 1
int?count = refCountTable[tableKey];
refCountTable[tableKey] = (int)count + 1;
}
return(locker);
}
}
//////////////////////////FS operations ///////////////////////////////////
/// @param [in] id -- get entry using ID directly </param>
internal static SqlFsNode getFsNodeByID(SQLiteDatabase db, SqlFsLocker fsLocker, FsID id)
{
SqlFsNode fsNode = null;
string @where = SqlStr.genWhere(new SqlStr.SqlSimpCond(SqlFs.FSBLOCK.fsID.ToString(), "=", id));
Cursor c = null;
try
{
c = db.query(SqlFs.DBNAMES.FsBlock.ToString(), new string[] { SqlFs.FSBLOCK.fsID.ToString(), SqlFs.FSBLOCK.fsType.ToString() }, @where, null, null, null, null);
if (c.moveToFirst())
{
fsNode = SqlFsNode.getFsNode(db, fsLocker, c);
}
}
catch (Exception e)
{
SqlFsLog.debug(e);
SqlFsErrCode.CurrentError = FsErr.GetFieldError;
}
finally
{
SqlFsFunc.close(c);
}
return(fsNode);
}
private void open()
{
this.db = SQLiteDatabase.openOrCreateDatabase(this.dbPath, null);
if (this.fsLocker == null)
{
this.fsLocker = SqlFsLocker.getFsLocker(this.dbPath);
}
}
private SqlFs(Context ctxt, string dbPath)
{
if (dbPath.StartsWith(SqlFsConst.STRPATHSEP))
{
this.dbPath = dbPath; // use full path already
}
else
{
this.dbPath = ctxt.getDatabasePath(dbPath).AbsolutePath;
}
this.fsLocker = SqlFsLocker.getFsLocker(this.dbPath);
}
/// <summary>
/// Should close the DB after use.
/// </summary>
public virtual void close()
{
SqlFsErrCode.unset();
SqlFsLocker.close(fsLocker);
fsLocker = null;
if (this.db != null)
{
this.db.close();
this.db = null;
}
}
/// <summary>
/// Get a fsNode from the result
/// </summary>
internal static SqlFsNode getFsNode(SQLiteDatabase db, SqlFsLocker fsLocker, Cursor c)
{
SqlFsNode fsNode = null;
SqlFsConst.FSTYPE type = SqlFsConst.FSTYPE.toFSTYPE(c.getInt(SqlFs.FSBLOCK.fsType.ordinal()));
if (type == SqlFsConst.FSTYPE.DIR)
{
fsNode = SqlDir.getDir(db, fsLocker, c);
}
else if (type == SqlFsConst.FSTYPE.FILE)
{
fsNode = SqlFile.getFile(db, fsLocker, c);
}
return(fsNode);
}
private SqlDir(SQLiteDatabase db, SqlFsLocker fsLocker, FsID id) : base(db, fsLocker, id)
{
}
internal static SqlDir getDir(SQLiteDatabase db, SqlFsLocker fsLocker, Cursor c)
{
FsID id = SqlFsFunc.getID(c, SqlFs.FSBLOCK.fsID.ordinal());
return(SqlDir.getDir(db, fsLocker, id));
}
internal static SqlDir getDir(SQLiteDatabase db, SqlFsLocker fsLocker, FsID id)
{
SqlDir d = new SqlDir(db, fsLocker, id);
return(d);
}
internal static SqlFile getFile(SQLiteDatabase db, SqlFsLocker fsLocker, FsID id)
{
SqlFile f = new SqlFile(db, fsLocker, id);
return(f);
}
protected internal SqlFsNode(SQLiteDatabase db, SqlFsLocker fsLocker, FsID id)
{
this.db = db;
this.fsLocker = fsLocker;
this.id = id;
}
