[daisy] Daisy detachment

[tim_cranfield at goldenboat.net]

In the detachment project we need to be able to persist a 
Document offline. It was suggested that we use an XML file 
written with document.getXml(), and a separate file for 
anything else useful like branch and language names.
http://lists.cocoondev.org/pipermail/daisy/2006-July/004380.html

Looking at the methods for DocumentDocument, I'm wondering if 
and how its possible to set fields, links and parts.

Another issue I'm having is with unzipping detachment files. I 
think the problem is with my zip method :

public static File zipDetachment(String dir2zip, 
ZipOutputStream zos){
		//create a new File object based on the directory we have to 
zip
	    File zipDir = new File(dir2zip);
		zipDir.mkdir();
		try {
	
	        //get a listing of the directory content
	        String[] dirList = zipDir.list();
	        byte[] readBuffer = new byte[2156];
	        int bytesIn = 0;
	        //loop through dirList, and zip the files
	        for(int i=0; i<dirList.length; i++) {
	            File f = new File(zipDir, dirList[i]);
		        if(f.isDirectory()) {
		                //if the File object is a directory, call 
this
		                //function again to add its content 
recursively
		            String filePath = f.getPath();
		            zipDetachment(filePath, zos);
		                //loop again
		            continue;
		        }
	            //if we reached here, the File object f was not 
 a directory
	            //create a FileInputStream on top of f
	            FileInputStream fis = new FileInputStream(f);
	            //create a new zip entry
		        ZipEntry anEntry = new ZipEntry(f.getPath());
		            //place the zip entry in the ZipOutputStream 
object
		        zos.putNextEntry(anEntry);
	            //now write the content of the file to the 
ZipOutputStream
	            while((bytesIn = fis.read(readBuffer)) != -1){
	                zos.write(readBuffer, 0, bytesIn);
				fis.close();
	            }
	          zos.close();
	        }
			
		} catch(Exception e) {
	    //handle exception
		}
		return zipDir;
	}

When I list the contents of the zipped file:

  entries = zipFile.entries();
			
		      while(entries.hasMoreElements()) {
		        ZipEntry entry = (ZipEntry)entries.nextElement();
				System.out.println(entry.getName());
}

The directories are not listed and the paths are printed 
instead of the name. This does not happen when I use the above 
code on other zip files. It may be an issue with the file 
separator character, I have tried various things without 
success.