Should be simple.

**Time** · June 22nd, 2010, 01:12 AM

Im trying to make genuine use of the "seek" method in RandomFileAccess,

Would the getPosistion within this class be a valid marker for the current posistion? (As you may as already geuss Im here because It isnt)

package org.name.cache;
 
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
 
public class EXPOutStream extends DataOutputStream {
 
	private int posistion;
 
	public EXPOutStream(OutputStream out) {
		super(out);
	}
 
	public int getPosistion() {
		return posistion;
	}
 
	@Override
	public synchronized void write(byte[] b, int off, int len) throws IOException {
		super.write(b, off, len);
		setPosistion(getPosistion() + len);
	}
 
	public void setPosistion(int posistion) {
		this.posistion = posistion;
	}
 
}

Anyone know what the correct method would be?

**Json** · June 22nd, 2010, 01:15 AM

Wouldn't it be something more like this?

setPosistion(off + len);

As I understand the off variable is the offset of where to start your writing, or?

// Json

**Time** · June 22nd, 2010, 01:21 AM

Yes the off is offset from within the actual byte array you begin off, the len is the actual length you base off of that,

The method within the actual DatainputStream would look simular to this:

       for (int i = 0; i <  length; i++) {
            write(buffer[offset + i]);
        }

so the l is still the amount of actual bytes being written

So me saying

setPosistion(getPosistion() + len);

Is basically adding the current position plus the number of bytes being written (len)

Just not understanding whats wrong with it.

**Time** · June 22nd, 2010, 01:28 AM

Haha fixed didn't relize there was a field "written" within the datainputstream.

Thanks JSon for your attempt anyway.

**Json** · June 22nd, 2010, 02:23 AM

Yeah I had a hunch there'd already be data in there so you'd have to offset that. Good stuff

// Json

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