Re: [Libguestfs] Hivex java binding

On Wed, Apr 27, 2011 at 05:50:42PM +0000, Michael Huang wrote: In both libguestfs and hivex we take a very aggressive approach to boilerplate code, like bindings. The approach is that we generate it all in a large generator program (in both cases, in the generator/ directory of the source). Grab the latest libguestfs source tarball (not git) since it has the generator and the generated Java bindings. It's helpful to compare the two things. # generator generator/generator_java.ml # generated files $ grep ^java generator/files-generated.txt java/Bindtests.java java/Makefile.inc java/com/redhat/et/libguestfs/Application.java java/com/redhat/et/libguestfs/Dirent.java java/com/redhat/et/libguestfs/GuestFS.java java/com/redhat/et/libguestfs/INotifyEvent.java java/com/redhat/et/libguestfs/IntBool.java java/com/redhat/et/libguestfs/LV.java java/com/redhat/et/libguestfs/PV.java java/com/redhat/et/libguestfs/Partition.java java/com/redhat/et/libguestfs/Stat.java java/com/redhat/et/libguestfs/StatVFS.java java/com/redhat/et/libguestfs/VG.java java/com/redhat/et/libguestfs/Version.java java/com/redhat/et/libguestfs/XAttr.java java/com_redhat_et_libguestfs_GuestFS.c The idea is to take hivex/generator/generator.ml and write an equivalent generator for Java. Each function in the hivex API is defined here, for example: "value_key", (RString, [AHive; AValue "val"]), (hivex_value_key, returning a string, taking as parameters a hive handle and a value). Most of the code in the generator is pretty simplistic. It just iterates over the list of API functions, and generates the appropriate bits of boilerplate for each parameter and the return value. It'll help, but it's not really that hard, and mostly it's just using our custom 'pr' command to print things (like printf), and List.iter to iterate over things. There is a tutorial here: http://mirror.ocamlcore.org/ocaml-tutorial.org/index.html and this book is excellent if you need more detail: http://www.cs.caltech.edu/courses/cs134/cs134b/book.pdf Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-df lists disk usage of guests without needing to install any software inside the virtual machine. Supports Linux and Windows. http://et.redhat.com/~rjones/virt-df/