## 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{static} =} javaclasspath ()
## @deftypefnx {Function file} {[@var{static}, @var{dynamic}] =} javaclasspath ()
## @deftypefnx {Function file} {@var{path} =} javaclasspath (@var{what})
## Return the class path of the Java virtual machine in
## the form of a cell array of strings. 
##
## If called without input parameter:@*
## @itemize
## @item If no output is requested, the result is simply printed 
## on the standard output.
## @item If one output value @var{STATIC} is requested, the result is
## the static classpath.
## @item If two output values@var{STATIC} and @var{DYNAMIC} are 
## requested, the first variable will contain the static classpath,
## the second will be filled with the dynamic classpath.
## @end itemize
## 
## If called with a single input parameter @var{what}:@*
## @itemize
## @item If @var{what} is @code{"-static"} return the static classpath
## @item If @var{what} is @code{"-dynamic"} return the dynamic classpath
## @item If @var{what} is @code{"-all"} return both the static and
## dynamic classpath
## @end itemize
## @seealso{javaaddpath, javarmpath}
## @end deftypefn

function varargout = javaclasspath (which)

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

  ## static classpath
  static_path = java_invoke ("java.lang.System", "getProperty", "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 = static_path_list(2:numel (static_path_list));
  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") == 1)
            disp_path_list ( "STATIC", static_path_list )
          elseif (strcmp (which, "-dynamic") == 1)
            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