#*************************************************************************
#
#   $RCSfile: pythonloader.py,v $
#
#   $Revision: 1.2 $
#
#   last change: $Author: jbu $ $Date: 2003-04-06 17:16:47 $
#
#   The Contents of this file are made available subject to the terms of
#   either of the following licenses
#
#          - GNU Lesser General Public License Version 2.1
#          - Sun Industry Standards Source License Version 1.1
#
#   Sun Microsystems Inc., October, 2000
#
#   GNU Lesser General Public License Version 2.1
#   =============================================
#   Copyright 2000 by Sun Microsystems, Inc.
#   901 San Antonio Road, Palo Alto, CA 94303, USA
#
#   This library is free software; you can redistribute it and/or
#   modify it under the terms of the GNU Lesser General Public
#   License version 2.1, as published by the Free Software Foundation.
#
#   This library 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
#   Lesser General Public License for more details.
#
#   You should have received a copy of the GNU Lesser General Public
#   License along with this library; if not, write to the Free Software
#   Foundation, Inc., 59 Temple Place, Suite 330, Boston,
#   MA  02111-1307  USA
#
#
#   Sun Industry Standards Source License Version 1.1
#   =================================================
#   The contents of this file are subject to the Sun Industry Standards
#   Source License Version 1.1 (the "License"); You may not use this file
#   except in compliance with the License. You may obtain a copy of the
#   License at http://www.openoffice.org/license.html.
#
#   Software provided under this License is provided on an "AS IS" basis,
#   WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
#   WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
#   MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
#   See the License for the specific provisions governing your rights and
#   obligations concerning the Software.
#
#   The Initial Developer of the Original Code is: Ralph Thomas
#
#   Copyright: 2000 by Sun Microsystems, Inc.
#
#   All Rights Reserved.
#
#   Contributor(s): Ralph Thomas, Joerg Budischewski
#
#*************************************************************************
import uno
import unohelper
import imp
import os
from com.sun.star.uno import Exception,RuntimeException
from com.sun.star.loader import XImplementationLoader
from com.sun.star.lang import XServiceInfo

MODULE_PROTOCOL = "vnd.openoffice.pymodule:"
DEBUG = 0

g_supportedServices  = "com.sun.star.loader.Python",      # referenced by the native C++ loader !
g_implementationName = "org.openoffice.comp.pyuno.Loader" # referenced by the native C++ loader !

def splitUrl( url ):
      nColon = url.find( ":" )
      if -1 == nColon:
            raise RuntimeException( "PythonLoader: No protocol in url " + url )
      return url[0:nColon], url[nColon+1:len(url)]

g_loadedComponents = {}

class Loader( XImplementationLoader, XServiceInfo, unohelper.Base ):
      def __init__(self, ctx ):
	  if DEBUG:
	     print "pythonloader.Loader ctor" 
	  self.ctx = ctx

      def getModuleFromUrl( self, url ):
          if DEBUG:
                print "pythonloader: interpreting url " +url
          protocol, dependent = splitUrl( url )
          if "vnd.sun.star.expand" == protocol:
                exp = self.ctx.getValueByName( "/singletons/com.sun.star.util.theMacroExpander" )
                url = exp.expandMacros(dependent)
                protocol,dependent = splitUrl( url )

          if DEBUG:
                print "pythonloader: after expansion " +protocol +":" + dependent
                
          try:
                if "file" == protocol:
                      mod = g_loadedComponents.get( url )
                      if not mod:
                            mod = imp.new_module("uno_component")
                            # remove \..\ sequence, which may be useful e.g. in the build env
                            url = unohelper.absolutize( url, url )

                            # read the file
                            fileHandle = file( unohelper.fileUrlToSystemPath( url ) )
                            src = fileHandle.read()

                            # execute the module
                            exec src in mod.__dict__
                            g_loadedComponents[url] = mod
                      return mod
                elif "vnd.openoffice.pymodule" == protocol:
                      return  __import__( dependent )
                else:
                      raise RuntimeException( "PythonLoader: Unknown protocol " +
                                              protocol + " in url " +url, self )
          except ImportError, e:
                raise RuntimeException( "Couldn't load "+url+ " for reason "+str(e), None)
          return None
	   
      def activate( self, implementationName, dummy, locationUrl, regKey ):
	  if DEBUG:
	     print "pythonloader.Loader.activate"

	  mod = self.getModuleFromUrl( locationUrl )
          implHelper = mod.__dict__.get( "g_ImplementationHelper" , None )
          if implHelper == None:
		return mod.getComponentFactory( implementationName, self.ctx.ServiceManager, regKey )
          else:
		return implHelper.getComponentFactory( implementationName,regKey,self.ctx.ServiceManager)
	     
      def writeRegistryInfo( self, regKey, dummy, locationUrl ):
	  if DEBUG:
	     print "pythonloader.Loader.writeRegistryInfo"
             
	  mod = self.getModuleFromUrl( locationUrl )
          implHelper = mod.__dict__.get( "g_ImplementationHelper" , None )
          if implHelper == None:
	        return mod.writeRegistryInfo( self.ctx.ServiceManager, regKey )
          else:
	        return implHelper.writeRegistryInfo( regKey, self.ctx.ServiceManager )

      def getImplementationName( self ):
	  return g_implementationName

      def supportsService( self, ServiceName ):
	  return ServiceName in self.serviceNames

      def getSupportedServiceNames( self ):
	  return g_supportedServices