topic Re: Howto Change Mimetype for Existing Content in Alfresco Archive

Howto Change Mimetype for Existing Content

stevewickii — Wed, 21 Jan 2009 18:07:12 GMT

How would I change the mime-type on a piece of existing content?I have tried several methods and none seem to work. The program executes with no problem, it just doesn't do anything to the content.Method 1: Using the ContentWriterTransactionService transactionService = serviceRegistry.getTransactio

Re: Howto Change Mimetype for Existing Content

tommorris — Tue, 27 Jan 2009 10:25:41 GMT

I'm not sure. That's how I would try it. It could be a defect.

Perhaps that only works if you're actually going to go ahead and write something using the channel you get from the ContentWriter…?
It would be a shame to stream the content out and then back in though.

Maybe try opening up random access channel and then force write-flush, with the 'metadata' param as true:

fileChannel = contentWriter.getFileChannel(false);
contentWriter.setMimetype("text/plain");
fileChannel.force(true);
fileChannel.close();

…?

Re: Howto Change Mimetype for Existing Content

lotharm — Tue, 27 Jan 2009 12:16:13 GMT

You can set the mimetype using the NodeService instead:


ContentData cd = (ContentData) nodeService.getProperty(nodeRef, ContentModel.PROP_CONTENT);
ContentData newCD = ContentData.setMimetype(cd, "other/mimetype");
nodeService.setProperty(nodeRef, ContentModel.PROP_CONTENT, newCD);
‍‍‍‍‍

It seems, that the ContentReader or ContentWriter .setMimetype method is only usable for creating new content. Might be a bug or a feature 😎

Regards,
lothar

Re: Howto Change Mimetype for Existing Content

tommorris — Tue, 27 Jan 2009 12:18:17 GMT

Of course! Thank you.