Lib.modjy.modjy_write.py Maven / Gradle / Ivy

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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 types

from modjy_exceptions import *

class write_object:

    def __init__(self, ostream):
        self.ostream = ostream
        self.num_writes = 0

    def __call__(self, *args, **keywords):
        if len(args) != 1 or not isinstance(args[0], types.StringTypes):
            raise NonStringOutput("Invocation of write callable requires exactly one string argument")
        try:
            self.ostream.write(args[0]) # Jython implicitly converts the (binary) string to a byte array
            # WSGI requires that all output be flushed before returning to the application
            # According to the java docs: " The flush method of OutputStream does nothing."
            # Still, leave it in place for now: it's in the right place should this
            # code ever be ported to another platform.
            self.ostream.flush()
            self.num_writes += 1
        except Exception, x:
            raise ModjyIOException(x)