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#!/usr/bin/env python
#
# Transformation of an etree doc with XSLT.
#
# Author:Just van den Broecke
from stetl.component import Config
from stetl.util import Util, etree
from stetl.filter import Filter
from stetl.packet import FORMAT
log = Util.get_log("xsltfilter")
class XsltFilter(Filter):
"""
Invokes XSLT processor (via lxml) for given XSLT script on an etree doc.
consumes=FORMAT.etree_doc, produces=FORMAT.etree_doc
"""
@Config(ptype=str, required=True)
def script(self):
"""
Path to XSLT script file.
"""
pass
# Constructor
def __init__(self, configdict, section):
Filter.__init__(self, configdict, section, consumes=FORMAT.etree_doc, produces=FORMAT.etree_doc)
self.xslt_file = open(self.script, 'r')
# Parse XSLT file only once
self.xslt_doc = etree.parse(self.xslt_file)
self.xslt_obj = etree.XSLT(self.xslt_doc)
self.xslt_file.close()
def invoke(self, packet):
if packet.data is None:
return packet
return self.transform(packet)
def transform(self, packet):
packet.data = self.xslt_obj(packet.data)
log.info("XSLT Transform OK")
return packet
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