'''
Created on Dec 10, 2011

@author: michel
'''
from lxml import etree
from lxml import objectify
from FeatureServer.WebFeatureService.FilterEncoding.FilterEncoding import FilterEncoding
from FeatureServer.WebFeatureService.Transaction.Transaction import Transaction
from FeatureServer.WebFeatureService.FilterEncoding.Select import Select
from copy import deepcopy

class WFSRequest(object):
    dom     = None
    data    = ""
    parser  = None
    
    transaction = None
    filter = None
    
    def __init__(self):
        self.parser = objectify.makeparser(remove_blank_text=True, ns_clean=True)

    def parse(self, data):
        self.data = data
        #self.data = self.data.replace('wildCard="*"', 'wildCard="\*"')
        #self.data = self.data.replace('wildCard="?"', 'wildCard="\?"')
        #self.data = self.data.replace('singleChar="*"', 'singleChar="\*"')
        #self.data = self.data.replace('singleChar="?"', 'singleChar="\?"')
        
        self.dom = etree.XML(self.data, parser=self.parser)
        
        
    def render(self, datasource):
        '''
        Renders a FilterEncoding to its SQL
        '''
        query = self.dom.xpath("//*[local-name() = 'Query']")
        if len(query) > 0:
            #query - return a dummy select object
            self.filter = FilterEncoding(deepcopy(query[0]).getchildren()[0])
        else:
            self.filter = FilterEncoding(self.data)

        self.filter.parse()
        return self.filter.render(datasource)
        
    def getActions(self):
        '''
        Returns all WFS-T transactions
        '''
        query = self.dom.xpath("//*[local-name() = 'Query']")
        if len(query) > 0:
            #query - return a dummy select object
            return [Select(etree.tostring(deepcopy(query[0]).getchildren()[0]))]
        else:
            # returning all transaction objects in a array 
            self.transaction = Transaction()
            self.transaction.parse(self.data)
            return self.transaction.getActions()
        
        return None