[xwiki-devs] Filesystem Attachment Store / Active Directory Default Group

Hi everybody! I changed somethings in our XWiki source and now I want to make a component or something like it to share with all of you, possibly including it in the official source code. This is the modifications I made: * Store every attachment (including its revisions) in the filesystem, not in the database (able to customize the storage folder in xwiki.cfg). * Set a "default group" to XWikiLDAPAuthServiceImpl, where all users logged through Active Directory is automatically added to this group. This is a workaround for the "Default Group" problem on Windows, where the users belongs to the group in Active Directory but the "memberOf" property comes empty. My problem is I could not find an up-to-date tutorial about writing components. I also could not find a simple explanation about how to tell XWiki not to use XWikiHibernateAttachmentStore and HibernateAttachmentVersioningStore, using my classes instead. By the way, I'm not an advanced Java programmer, so I need the things well explained! ;) Anybody can help? Best regards! Felipe Giotto