public virtual bool saveFileData(IFileData fileData)
{
SqlFsErrCode.CurrentError = FsErr.OK;
bool isOK = false;
fsLocker.FsLock;
SqlFsTransaction fsTran = new SqlFsTransaction(db);
try
{
isOK = __saveFileData(fileData);
if (isOK)
{
fsTran.fsOpSuccess();
}
}
finally
{
fsTran.dispose();
fsLocker.dispose();
}
return(isOK);
}
/// <summary>
/// Save data to data block table
/// </summary>
private bool __saveFileData(IFileData fileData)
{
bool isOK = false;
do
{
FsID dataBlockID = this.getDataBlockID();
if (dataBlockID.compare(SqlFsConst.INVALIDID) == 0) // new file without data will be -1
{
SqlFsErrCode.CurrentError = FsErr.DataBlockIDNotValid;
break;
}
FsID newDataBlockID = fileData.saveData(db, dataBlockID);
if (newDataBlockID.compare(SqlFsConst.INVALIDID) <= 0)
{
SqlFsErrCode.CurrentError = FsErr.SaveFileDataErr;
break;
}
// update file size
this.setField(FSBLOCK.fsFileSize, fileData.DataSizeInByte);
// update itself (data block table) so that last mod time can be updated
this.setDataBlockID(newDataBlockID);
isOK = true;
} while (false);
return(isOK);
}
public static SqlFs create(string dbPath, IFileData dummyInst, Context ctxt, AtomicBoolean isNewTableCreated)
{
SqlFsErrCode.CurrentError = FsErr.OK;
SqlFs fs = null;
try
{
if (dbPath != null)
{
fs = new SqlFs(ctxt, dbPath);
if (fs != null)
{
fs.fsLocker.FsLock;
try
{
fs.open();
fs.prepare(dummyInst, isNewTableCreated);
}
finally
{
fs.fsLocker.dispose();
}
}
}
}
catch (Exception e)
{
SqlFsLog.debug("ERROR: Cannot open database, " + e.Message);
SqlFsErrCode.CurrentError = FsErr.CannotOpenDB;
}
return(fs);
}
/// <summary>
/// Retrieve data from data block table
/// </summary>
private bool __getFileData(IFileData fileData)
{
FsID dataBlockID = this.getDataBlockID();
if (dataBlockID.compare(SqlFsConst.INVALIDID) <= 0)
{
SqlFsErrCode.CurrentError = FsErr.DataBlockIDNotValid;
return(false);
}
return(fileData.getData(db, dataBlockID));
}
public virtual bool getFileData(IFileData fileData)
{
SqlFsErrCode.CurrentError = FsErr.OK;
fsLocker.FsLock;
try
{
return(__getFileData(fileData));
}
finally
{
fsLocker.dispose();
}
}
/// <summary>
/// Prepare database tables if not already exists
/// </summary>
private void prepare(IFileData dummyInst, AtomicBoolean isNewTableCreated)
{
if (!checkTables())
{
// create new tables
db.execSQL(SqlStr.genCreateTable(DBNAMES.FsBlock.ToString(), COLFSBLOCK));
db.execSQL(SqlStr.genCreateTable(DBNAMES.FsInfo.ToString(), COLFSINFO));
db.execSQL(SqlStr.genCreateTable(IFileData.DTABLENAME, dummyInst.ColSchema));
// create root dir, too
createRootDir();
// Write default info
writeInfo(FSINFOFIELDS.version.ToString(), SqlFsVersion.SqlFsVersion);
writeInfo(FSINFOFIELDS.createTimeUtc.ToString(), TimeConverter.calendarToReadableDateTime(DateTime.getInstance(TimeZone.getTimeZone("GMT+00:00"))));
writeInfo(FSINFOFIELDS.fsLabel.ToString(), SqlFsConst.DEFFSLABEL);
writeInfo(FSINFOFIELDS.IDSize.ToString(), Convert.ToString(FsID.IDSize));
isNewTableCreated.set(true);
}
}
///
/// @param [in] dbPath -- absolute or relative path (inside phone memory) to the db file </param>
/// @param [in] dummyInst -- a dummy instance of a class inherited from IFileData. </param>
public static SqlFs create(string dbPath, IFileData dummyInst, Context ctxt)
{
AtomicBoolean isNewTableCreated = new AtomicBoolean(false);
return(SqlFs.create(dbPath, dummyInst, ctxt, isNewTableCreated));
}