[jdom-interest] How many bytes is my JDOM Document

[Rolf Lear]

This is an un-necessarily memory-demanding mechanism for doing it. The
complete document is required to be stored in the bytearray, and will need
garbage collection, etc.
 
A faster, and more memory friendly way to do it would be to create a class
like what's at the end, and use it instead of the ByteArrayOutputStream.
 
Rolf
import java.io.IOException;

import java.io.OutputStream;

public final class CountingDevNullOutputStream extends OutputStream {

private int count = 0;

public void reset() {

count = 0;

}

public int size() {

return count;

}

public void write(int b) throws IOException {

count++;

}

public void close() throws IOException {

}

public void flush() throws IOException {

}

public void write(byte[] b, int off, int len) throws IOException {

count += len;

}

public void write(byte[] b) throws IOException {

count += b.length;

}

}

 

-----Original Message-----
From: jdom-interest-bounces at jdom.org
[mailto:jdom-interest-bounces at jdom.org]On Behalf Of Søren Faltz
Sent: Tuesday, August 08, 2006 6:09 AM
To: jdom-interest at jdom.org
Subject: Re: [jdom-interest] How many bytes is my JDOM Document


I am determing the size this way
 

String s;
    int contentLength=0;

    try {
      s = convertDocumentToString(doc);
      
      ByteArrayOutputStream bout = new ByteArrayOutputStream();
      ObjectOutputStream objOut = new ObjectOutputStream(bout);
      
      objOut.writeObject (s);
      contentLength = bout.size();

      objOut.flush();
      bout.flush(); 



 
2006/8/4, Paul Libbrecht < paul at activemath.org <mailto:paul at activemath.org>
>: 

Print it to a stream that only counts but otherwise discards ? It's easy
to write such a stream... just subclass outputstream.write(byte) and
maybe .write(byte[],start,len) and count...

I don't think there's a way without outputting.

paul

Søren Faltz wrote:
> I want to find out how many bytes my document is. 
> An easy way would be to stream the document to disk, and then call
> File.size()
> but is there any way to find out without saving the document to disk
> first??







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