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From "Seidel. Robert" <Robert.Sei...@aeb.de>
Subject AW: Retrieve coded filename from datastore
Date Tue, 04 Jan 2011 07:53:26 GMT
Hi,

There are two possibilities:

First:

Create your own helper class within the jackrabbit-core-...jar to access the non public BLOBFileValue
class and its non public method getDataIdentifier.

Second: 

Reimplement the jackrabbit mechanism:

FileDataStore

	addRecord(InputStream input) {
		...
            // Copy the stream to the temporary file and calculate the
            // stream length and the message digest of the stream
            long length = 0;
            MessageDigest digest = MessageDigest.getInstance(DIGEST);
            OutputStream output = new DigestOutputStream(
                    new FileOutputStream(temporary), digest);
            try {
                length = IOUtils.copyLarge(input, output);
            } finally {
                output.close();
            }
            DataIdentifier identifier = new DataIdentifier(digest.digest());
		...

Kindly Regards, Robert ;)

-----Urspr√ľngliche Nachricht-----
Von: yun [mailto:zhiyun@ecquaria.com] 
Gesendet: Dienstag, 4. Januar 2011 04:32
An: users@jackrabbit.apache.org
Betreff: Retrieve coded filename from datastore


Hi,

I know that we are not suppose to get the coded file from
"jackrabbit\repository\datastore" folder where the raw files are stored by
the jack rabbit repository. Example of a filename would be:
52cd141937e037b89c8989d1411f63e98bcb7981

The file name is named by using the "52\cd\14" in
"repository\datastore\52\cd\14" which is the folder where the file is
stored. 

Question:

Is there a way to obtain this name through some java codes when writing the
file to the repository? 

I need this file name as a backup option if ever the repository is
corrupted, I would still have an option to retrieve the file from the
folders according to the filename. Thanks.
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