Javablogs audience chart

JavaBlogsStats.groovy

import java.util.*;


/**
 * @author Luc
 * Change startDate and endDate (must span at least 2 full months)
 * 
 */
 def sdf = new java.text.SimpleDateFormat("dd-MM-yyyy")

 def baseUrl = "http://www.javablogs.com"
 def startDate = sdf.parse("01-01-2007")
 def endDate = sdf.parse("01-02-2009")
 def resultMap = [:] as TreeMap
 
def addStatsForDate = { Calendar c ->
		def dayOfMonth = c.get(Calendar.DAY_OF_MONTH)
		def month = c.get(Calendar.MONTH)
		def year = c.get(Calendar.YEAR)
		def xmlSurpler = new XmlSlurper()
		def url = "${baseUrl}/ViewDaysBlogs.action?date=${dayOfMonth}&month=${month}&year=${year}&view=rss"
		def rss = xmlSurpler.parse(url)
		def items = rss.channel.item
		resultMap[c.getTimeInMillis()]=items.size()
		println "Processed date ${dayOfMonth} ${month+1} ${year}"
}

def encodeMap = {
  List list = []
  for (i in (('A'..'Z') + ('a'..'z') + (0..9)))  {
    list << i
  }
  String s = "&chd=t:"
  def resultByYears = [:]
  int curYear = -1
  
  resultMap.each { long t,int v ->
      Calendar c = Calendar.getInstance()
      c.setTimeInMillis(t)
	  if (c.get(Calendar.YEAR)!=curYear) {
		  curYear = c.get(Calendar.YEAR)
		  resultByYears[curYear]=[:]
	  }
	  int count = resultByYears[curYear][c.get(Calendar.MONTH)]?:0
	  count+=v
	  resultByYears[curYear][c.get(Calendar.MONTH)]=count
  }
  resultByYears.values().eachWithIndex { val,index ->
  	  if (index > 0) {
  		  s+=","
  	  }
	  s+=val.values().join(",")
  }

  s += "&chxl=0:|"
  resultByYears.eachWithIndex { k,v,index ->
      println k
  	  if (index > 0) {
  		  s+="|"
  	  }
  	
	  s+=v.keySet().collect{
		  (it+1)+"-"+"${k}"[-2..-1]
	  }.join("|")
  }
  	  
  return s
}

	
def createGChart = {
   def chartTitle = URLEncoder.encode("Javablogs monthly frequentation | since ${sdf.format(startDate)} to ${sdf.format(endDate)}")
   def url="http://chart.apis.google.com/chart?cht=lc&chs=500x500&chtt=${chartTitle}&chxt=x,y&chxr=1,0,10000&chds=0,10000"+encodeMap()
   return url
}
	
def currentDate = Calendar.getInstance()
currentDate.setTime(startDate)
while(currentDate.getTimeInMillis() < endDate.getTime()) {
	addStatsForDate(currentDate)
	currentDate.add(Calendar.DAY_OF_MONTH,1)
}

def url = createGChart()
print url