Question about FileManagers in Jigsaw.

[Jonathan Gibbons]

On 03/10/2012 10:32 AM, Fredrik Öhrström wrote:
> If I create my own Forwarding file manager in Jigsaw,
> how do I detect which module a getFileForOutput is meant for?
>
> //Fredrik

You'll need to start getting your head around jigsaw compilation modes.  
There are essentially three possibilities:

1. no modules -- think of this as a legacy mode, similar to jdk 7 and 
earlier

2. a single module -- you can refer to other modules, but you're only 
compiling one -- in that case, all files written will be for the one module

3. multiple modules -- in that case, javac will use methods on the new 
ModuleFileManager interface, such that it dynamically creates a Location 
for each module. These locations are derived from the standard output 
location and an identifier for the module. Note this identifier is /not/ 
necessarily the same as the module ID.  The identifier will be the same 
subdirectory named in which the sources for the module were found. It is 
expected that it will typically be very similar to the module name, but 
that is not a requirement.  The rationale here is to /not/ have version 
numbers in the source directory naming hierarchy (because version 
numbers change over time), and to have 1-1 correspondence between the 
hierarchy under the input source and output class directories -- for the 
benefit of "simple" dependency analysis, such as found in Ant.

-- Jon