A Log singleton in java
I needed a simple logger in java. I wrote a quick singleton. I sort of want to keep this around if I ever need to use it again, so I thought I would post it here.
Note: Feel free to complain about this singleton using my own code style and not the java code style. 🙂
package ClinicSoft.Singletons;
import java.io.File;
import java.io.FileWriter;
public class Log
{
public static Log Instance = new Log();
private String _FileName;
private String _Extension = ".log";
private int _LogId = -1;
private Log()
{
SetFileName("ClinicSoft");
}
public String GetFileName()
{
if (_LogId > -1)
return _FileName + "." + _LogId + _Extension;
else
return _FileName + _Extension;
}
// The root file name, without the extension
public void SetFileName(String inFileName)
{
_FileName = inFileName;
while (FileExists(GetFileName()))
_LogId++;
}
private boolean FileExists(String inFile)
{
return new File(inFile).exists();
}
public static void WriteLine(String inLogMessage)
{
Log.Instance.WriteLog(inLogMessage
+ System.getProperty("line.separator"));
}
public void WriteLog(String inLogMessage)
{
try
{
// Create file
FileWriter file = new FileWriter(GetFileName(), true);
file.write(inLogMessage);
// Close the output stream
file.close();
}
catch (Exception e)
{
// Catch exception if any
System.err.println("Error: " + e.getMessage());
}
}
}
