'''
dpCache.py

Copyright 2006 Andres Riancho

This file is part of w3af, w3af.sourceforge.net .

w3af 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 version 2 of the License.

w3af 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 w3af; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

'''

import core.controllers.outputManager as om
from core.controllers.w3afException import w3afException
import core.data.parsers.documentParser as documentParser
from core.controllers.misc.lru import LRU
import md5

class dpCache:
	'''
	This class is a document parser cache.
	
	@author: Andres Riancho ( andres.riancho@gmail.com )
	'''
	def __init__(self):
		self._cache = LRU(100)
		
	def getDocumentParserFor( self, document, baseUrl, useTidy=True ):
		res = None
		hash = md5.new(document).hexdigest()
		
		if hash in self._cache:
			res = self._cache[ hash ]
		else:
			# Create a new instance of dp, add it to the cache
			res = documentParser.documentParser( document, baseUrl, useTidy )
			self._cache[ hash ] = res
		
		return res
	
dpc = dpCache()