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Jython is an implementation of the high-level, dynamic, object-oriented language Python written in 100% Pure Java, and seamlessly integrated with the Java platform. It thus allows you to run Python on any Java platform.
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###
#
# Copyright Alan Kennedy. 
# 
# You may contact the copyright holder at this uri:
# 
# http://www.xhaus.com/contact/modjy
# 
# The licence under which this code is released is the Apache License v2.0.
# 
# The terms and conditions of this license are listed in a file contained
# in the distribution that also contained this file, under the name
# LICENSE.txt.
# 
# You may also read a copy of the license at the following web address.
# 
# http://modjy.xhaus.com/LICENSE.txt
#
###

import jarray
import synchronize
import sys
import types

sys.add_package("javax.servlet")
sys.add_package("javax.servlet.http")
sys.add_package("org.python.core")

from modjy_exceptions import *
from modjy_log import *
from modjy_params import modjy_param_mgr, modjy_servlet_params 
from modjy_wsgi import modjy_wsgi
from modjy_response import start_response_object
from modjy_impl import modjy_impl
from modjy_publish import modjy_publisher

from javax.servlet.http import HttpServlet

class modjy_servlet(HttpServlet, modjy_publisher, modjy_wsgi, modjy_impl):

    def __init__(self):
        HttpServlet.__init__(self)

    def do_param(self, name, value):
        if name[:3] == 'log':
            getattr(self.log, "set_%s" % name)(value)
        else:
            self.params[name] = value
        
    def process_param_container(self, param_container):
        param_enum = param_container.getInitParameterNames()
        while param_enum.hasMoreElements():
            param_name = param_enum.nextElement()
            self.do_param(param_name, param_container.getInitParameter(param_name))

    def get_params(self):
        self.process_param_container(self.servlet_context)
        self.process_param_container(self.servlet)

    def init(self, delegator):
        self.servlet = delegator
        self.servlet_context = self.servlet.getServletContext()
        self.servlet_config = self.servlet.getServletConfig()
        self.log = modjy_logger(self.servlet_context)
        self.params = modjy_param_mgr(modjy_servlet_params)
        self.get_params()
        self.init_impl()
        self.init_publisher()
        import modjy_exceptions
        self.exc_handler = getattr(modjy_exceptions, '%s_handler' % self.params['exc_handler'])()

    def service (self, req, resp):
        wsgi_environ = {}
        try:
            self.dispatch_to_application(req, resp, wsgi_environ)
        except ModjyException, mx:
            self.log.error("Exception servicing request: %s" % str(mx))
            typ, value, tb = sys.exc_info()[:]
            self.exc_handler.handle(req, resp, wsgi_environ, mx, (typ, value, tb) )

    def get_j2ee_ns(self, req, resp):
        return {
            'servlet':         self.servlet,
            'servlet_context': self.servlet_context,
            'servlet_config':  self.servlet_config,
            'request':         req,
            'response':        resp,
        }

    def dispatch_to_application(self, req, resp, environ):
        app_callable = self.get_app_object(req, environ)
        self.set_wsgi_environment(req, resp, environ, self.params, self.get_j2ee_ns(req, resp))
        response_callable = start_response_object(req, resp)
        try:
            app_return = self.call_application(app_callable, environ, response_callable)
            if app_return is None:
                raise ReturnNotIterable("Application returned None: must return an iterable")
            self.deal_with_app_return(environ, response_callable, app_return)
        except ModjyException, mx:
            self.raise_exc(mx.__class__, str(mx))
        except Exception, x:
            self.raise_exc(ApplicationException, str(x))

    def call_application(self, app_callable, environ, response_callable):
        if self.params['multithread']:
            return app_callable.__call__(environ, response_callable)
        else:
            return synchronize.apply_synchronized( \
                app_callable, \
                app_callable, \
                (environ, response_callable))

    def expand_relative_path(self, path):
        if path.startswith("$"):
            return self.servlet.getServletContext().getRealPath(path[1:])
        return path

    def raise_exc(self, exc_class, message):
        self.log.error(message)
        raise exc_class(message)