problem getting map input filename

[Rares Vernica]

Hello,

I have a problem getting the map input file name. Here is what I tried:

public class Map extends Mapper<Object, Text, LongWritable, Text> {

    public void map(Object key, Text value, Context context)
            throws IOException, InterruptedException {
        Configuration conf = context.getConfiguration();
        System.out.println(conf.get("map.input.file"));
        System.out.println(conf.get("map.input.filename"));
        System.out.println(conf.get("mapred.input.file"));
        System.out.println(conf.get("mapred.input.filename"));
    }

    protected void setup(Context context) throws IOException,
            InterruptedException {
        Configuration conf = context.getConfiguration();
        System.out.println(conf.get("map.input.file"));
        System.out.println(conf.get("map.input.filename"));
        System.out.println(conf.get("mapred.input.file"));
        System.out.println(conf.get("mapred.input.filename"));
    }
}

All the get is "null". What am I doing wrong?

Thanks,
Rares