public static RandomAccessFile NewRandomAccessFile(String path, bool readOnly, bool lockFile)
{
RandomAccessFile raf = null;
bool ok = false;
try
{
raf = new RandomAccessFile(path, readOnly, lockFile);
if (lockFile)
{
Platform4.LockFile(path, raf);
}
ok = true;
return raf;
}
catch (IOException x)
{
if (new File(path).Exists())
{
throw new DatabaseFileLockedException(path, x);
}
throw new Db4oIOException(x);
}
finally
{
if(!ok && raf != null)
{
raf.Close();
}
}
}
/// <exception cref="System.IO.IOException"></exception>
private byte[] ReadAllBytes(string fileName)
{
int length = (int)new Sharpen.IO.File(fileName).Length();
RandomAccessFile raf = new RandomAccessFile(fileName, "rw");
byte[] buffer = new byte[length];
raf.Read(buffer);
raf.Close();
return buffer;
}
/// <exception cref="System.IO.IOException"></exception>
public static byte FileHeaderVersion(string testFile)
{
RandomAccessFile raf = new RandomAccessFile(testFile, "r");
byte[] bytes = new byte[1];
raf.Read(bytes);
// readByte() doesn't convert to .NET.
byte db4oHeaderVersion = bytes[0];
raf.Close();
return db4oHeaderVersion;
}
private void Write(string fileName, byte[] bytes, bool writeTrash)
{
if (bytes == null)
{
return;
}
try
{
RandomAccessFile raf = new RandomAccessFile(fileName, "rw");
raf.Write(BytesToWrite(bytes, writeTrash));
raf.Close();
}
catch (IOException e)
{
throw new Db4oException(e);
}
}
/// <exception cref="System.IO.IOException"></exception>
public virtual int WriteVersions(string file, bool writeTrash)
{
int count = 0;
int rcount = 0;
string lastFileName = file + "0";
string rightFileName = file + "R";
File4.Copy(lastFileName, rightFileName);
IEnumerator syncIter = _writes.GetEnumerator();
while (syncIter.MoveNext())
{
rcount++;
Collection4 writesBetweenSync = (Collection4)syncIter.Current;
RandomAccessFile rightRaf = new RandomAccessFile(rightFileName, "rw");
IEnumerator singleForwardIter = writesBetweenSync.GetEnumerator();
while (singleForwardIter.MoveNext())
{
CrashSimulatingWrite csw = (CrashSimulatingWrite)singleForwardIter.Current;
csw.Write(rightFileName, rightRaf, false);
}
rightRaf.Close();
IEnumerator singleBackwardIter = writesBetweenSync.GetEnumerator();
while (singleBackwardIter.MoveNext())
{
count++;
CrashSimulatingWrite csw = (CrashSimulatingWrite)singleBackwardIter.Current;
string currentFileName = file + "W" + count;
File4.Copy(lastFileName, currentFileName);
RandomAccessFile raf = new RandomAccessFile(currentFileName, "rw");
csw.Write(currentFileName, raf, writeTrash);
raf.Close();
lastFileName = currentFileName;
}
File4.Copy(rightFileName, rightFileName + rcount);
lastFileName = rightFileName;
}
return count;
}