i'm in need of a tool that migrates repository schemas for multiple versions of my application.
in other words, i need to be able to run a tool against an existing repository that adds, removes and (most importantly) alters node type definitions. eg "migrate the repository from version 1 to version 2 of my application" or correspondingly "migrate from version 2 to version 1". i'm considering building something like rails' "migrations" feature. the app developer would provide the tool with a java class that can migrate "up" (from version x-1 to x) and "down" (from x to x-1). the tool would chain these classes together to migrate up or down an abritrary number of versions. ideally the tool would work in-place against a single repository, but copying data out of a "version x" repository to an empty "x+n" or "x-n" repository would also work. to do in-place migrations, jackrabbit would have to support alteration of existing node types (adding and removing property types and child node types). having looked through the javadoc for o.a.j.core.nodetype, i don't see any such api. am i looking in the wrong place, or does it truly not exist? seems like a pretty complicated feature to add, if it's not already there. assuming those apis exist or someday materialize, it would also be excellent if the tool could accept scripts written in a ddl-like command language, perhaps one that uses/extends the cnd format. for example "alter nodetype calendar:event add propertytype calendar:uid mandatory" or even "alter nodetype ticket:ticktable add childnodetype ticket:ticket (ticket:ticket) =ticket:ticket multiple version" it's a good bet that the jcr-commands contrib project could be leveraged here. anyway, has anybody build a repository migration tool that does any amount of these things? or am i starting from scratch?
