Automate the Calendar component in Selenium WebDriver using JAVA.

package TestOpt;

import java.util.Calendar;
import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;

interface Xpaths
{
/*
* This inteface contains all the xpath's that are used in the program
*/
String calendarPopUpButtonxPath = "//*[@id='j_id354:j_id355PopupButton']";
String monthIncrementerxPath = "//*[@id='j_id354:j_id355Header']/table/tbody/tr/td[4]/div";
String monthDecrementerxPath = "//*[@id='j_id354:j_id355Header']/table/tbody/tr/td[2]/div";
String dayxPathPart1 = "//*[@id='j_id354:j_id355DayCell";
String dayxPathPart2 = "']";
String dayZeroxPath = "//*[@id='j_id354:j_id355DayCell0']";
String applyButtonxPath = "//*[@id='j_id354:j_id355Footer']/table/tbody/tr/td[6]/div";
}

interface Months
{
int JANUARY   = 1,
FEBRUARY  = 2,
MARCH     = 3,
APRIL     = 4,
MAY       = 5,
JUNE      = 6,
JULY      = 7,
AUGUST    = 8,
SEPTEMBER = 9,
OCTOBER   = 10,
NOVEMBER  = 11,
DECEMBER  = 12;
int MAX_DAY_IN_A_MONTH = 31;
}

public class AutomateJsfCalendar implements Xpaths,Months
{
/**Months
* @param args
*/
static int targetDay     = 0,
          targetMonth   = 0,
          targetYear    = 0;
static int currentDay    = 0,
          currentMonth  = 0,
          currentYear   = 0;
static int jumpMonthsBy  = 0,
              index = 0;

static boolean increment = true;
public static void main(String[] args)
{
WebDriver driver = new FirefoxDriver();
driver.navigate().to("http://livedemo.exadel.com/richfaces-demo/richfaces/calendar.jsf");
driver.manage().timeouts().implicitlyWait(15L, TimeUnit.SECONDS);
driver.manage().window().maximize();
WebElement element = driver.findElement(By.xpath(calendarPopUpButtonxPath));
element.click();
//At this point, jsf calendar component is displayed.
//Today's date is 30/03/2013. Let us say we want to set the date as 15/07/2013
String dateToSet = "15/07/2013";

GetTargetDateMonthAndYear(dateToSet);
GetCurrentDateMonthAndYear();
CalculateHowManyMonthsToJump();
for(int i=0;i<jumpMonthsBy;i++)
{
if(increment)
element = driver.findElement(By.xpath(monthIncrementerxPath));
else
element = driver.findElement(By.xpath(monthDecrementerxPath));
element.click();
try
{
//sleep will let you see the automation happening.
Thread.sleep(1000);
} catch (InterruptedException e)
{
e.printStackTrace();
}
}
CalculateCorrectDayIndex(driver);
String completePath = dayxPathPart1 + index + dayxPathPart2;

element = driver.findElement(By.xpath(completePath));
element.click();
element = driver.findElement(By.xpath(applyButtonxPath));
element.click();

  //driver.quit();
}//end of main..
/*
*This method will bisect the target date and upadates  targetDay, targetMonth & targetYear variables.
*/
static void GetTargetDateMonthAndYear(String dateString)
{
int firstIndex = dateString.indexOf("/");
int lastIndex = dateString.lastIndexOf("/");
String month = dateString.substring(0, firstIndex);
targetDay = Integer.parseInt(month);
String day = dateString.substring(firstIndex+1, lastIndex);
targetMonth = Integer.parseInt(day);
String year = dateString.substring(lastIndex+1, dateString.length());
}
/*
* This method will fetch current date and updates currentDay, currentMonth & currentYear variables.
*/
static void GetCurrentDateMonthAndYear()
{
Calendar cal = Calendar.getInstance();
currentDay   = cal.get(Calendar.DAY_OF_MONTH);
currentMonth = cal.get(Calendar.MONTH)+1;//+1 because month values starts from 0. January = 0.
currentYear  = cal.get(Calendar.YEAR);
}
/*
* This method decides how many time this ">" element on the calendar component needs to be clicked to reach target month.
*/
static void CalculateHowManyMonthsToJump()
{
if((targetMonth - currentMonth) > 0 )
{
jumpMonthsBy = (targetMonth - currentMonth);
}
else
{
jumpMonthsBy = (currentMonth - targetMonth);
increment = false;
}
}

/*
* This calculates the current index that holds the targetDay value that we need to click in the calendar control.
*/
static void CalculateCorrectDayIndex(WebDriver driver)
{
int tempMonth = targetMonth - 1;
if(tempMonth == 0)
{
//if target month is January, control will come inside.
tempMonth = DECEMBER;
}
WebElement element = driver.findElement(By.xpath(dayZeroxPath));
String str = element.getText();
int dayValueAtZeroIndex = Integer.parseInt(str);

if(dayValueAtZeroIndex == 1)
{
index = targetDay - 1;
}
else
{
switch(tempMonth)
{
case JANUARY:
case MARCH:
case MAY:
case JULY:
case AUGUST:
case OCTOBER:
case DECEMBER:
{
index = ((MAX_DAY_IN_A_MONTH - dayValueAtZeroIndex) + targetDay);
break;
}
case FEBRUARY:
{
/*
* Separate case is needed for feb because Feb contains only 28(MAX_DAY_IN_A_MONTH - 3) days.
*/
index = (((MAX_DAY_IN_A_MONTH - 3) - dayValueAtZeroIndex) + targetDay);
break;
}
default:
{
//Control will come here for months that consists of 30(MAX_DAY_IN_A_MONTH - 1) days.
index = (((MAX_DAY_IN_A_MONTH - 1) - dayValueAtZeroIndex) + targetDay);
break;
}
}
}
}
}//end of class.

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