## Copyright (C) 2007 Michael Goffioul
## Copyright (C) 2010 Martin Hepperle
##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or (at
## your option) any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING.  If not, see
## <http://www.gnu.org/licenses/>.

## -*- texinfo -*-
## @deftypefn  {Function File} {} javaclasspath ()
## @deftypefnx {Function File} {@var{dpath} =} javaclasspath ()
## @deftypefnx {Function File} {[@var{dpath}, @var{spath}] =} javaclasspath ()
## @deftypefnx {Function File} {@var{clspath} =} javaclasspath (@var{what})
## Return the class path of the Java virtual machine in the form of a cell
## array of strings. 
##
## If called with no inputs:
##
## @itemize
## @item If no output is requested, the dynamic and static classpaths are printed 
## to the standard output.
##
## @item If one output value @var{dpath} is requested, the result is
## the dynamic classpath.
##
## @item If two output values@var{dpath} and @var{spath} are 
## requested, the first variable will contain the dynamic classpath and
## the second will be contain the static classpath.
## @end itemize
## 
## If called with a single input parameter @var{what}:
##
## @table @asis
## @item "-dynamic"
## Return the dynamic classpath.
##
## @item "-static"
## Return the static classpath.
##
## @item "-all"
## Return both the static and dynamic classpath in a single cellstr.
## @end table
## @seealso{javaaddpath, javarmpath}
## @end deftypefn

function varargout = javaclasspath (which)

  ## dynamic classpath
  dynamic_path = javaMethod ("getClassPath", "org.octave.ClassHelper");
  dynamic_path_list = strsplit (dynamic_path, pathsep ());

  ## static classpath
  static_path = javaMethod ("getProperty", "java.lang.System", "java.class.path");
  static_path_list = strsplit (static_path, pathsep ());
  if (numel (static_path_list) > 1)
    ## remove first element (which is .../octave.jar)
    static_path_list(1) = [];
  else
    static_path_list = {};
  endif

  switch (nargin)
    case 0
      switch (nargout)
        case 0
          disp_path_list ("STATIC", static_path_list)
          disp ("");
          disp_path_list ("DYNAMIC", dynamic_path_list)

        case 1
          varargout{1} = cellstr (dynamic_path_list);

        case 2
          varargout{1} = cellstr (dynamic_path_list);
          varargout{2} = cellstr (static_path_list);
      endswitch
        
    case 1
      switch (nargout)
        case 0
          if (strcmp (which, "-static"))
            disp_path_list ("STATIC", static_path_list)
          elseif (strcmp (which, "-dynamic"))
            disp_path_list ("DYNAMIC", dynamic_path_list)
          elseif (strcmp (which, "-all") == 1)
            disp_path_list ("STATIC", static_path_list)
            disp ("");
            disp_path_list ("DYNAMIC", dynamic_path_list)
          endif

        case 1
          if (strcmp (which, "-static") == 1)
            varargout{1} = cellstr (static_path_list);
          elseif (strcmp (which, "-dynamic") == 1)
            varargout{1} = cellstr (dynamic_path_list);
          elseif (strcmp (which, "-all") == 1)
            varargout{1} = cellstr ([static_path_list, dynamic_path_list]);
          endif
      endswitch
  endswitch
  
endfunction

## Display cell array of paths

function disp_path_list (which, path_list)
  printf ("   %s JAVA PATH\n\n", which);
  if (numel (path_list) > 0)
    printf ("      %s\n", path_list{:});
  else
    printf ("      - empty -\n");
  endif
endfunction