Package pmdamora.natgeobackground

Class Main

java.lang.Object

pmdamora.natgeobackground.Main

public class Main
extends java.lang.Object

The NatGeoBackground program downloads the current National Geographic photo of the day and sets it as the desktop background.

Since:

2017-09-21

Version:

1.0

Author:

Paul D'Amora

Constructor Summary

Constructors

Constructor	Description
Main()

Method Summary

Modifier and Type	Method	Description
private static java.lang.String	buildJSONUrl(java.lang.String baseUrl)	This method builds the full JSON url by adding the formatted date to the base url
private static void	changeDesktopBackground(java.lang.String path)	This method changes the user's desktop background to the image located at the specified path
private static int	chooseImageSize(int[] sizeOptions)	This method chooses an appropriate image size from a list of options based on which is closest to the user's display resolution.
private static java.lang.String	createFilePath()	This method determines the exact file path of the downloaded image primarily based on the current date.
private static java.lang.String	downloadImage(java.lang.String strImageUrl)	This method takes the url of the image and downloads it to the user's filesystem in a specified location.
private static java.lang.String	getUrl(java.lang.String jsonUrl, int displayWidth)	This methods downloads and parses the provided JSON file, and locates the url of the appropriate image.
static void	main(java.lang.String[] args)	The constructor method calls all other methods in the program

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Main

public Main()

Method Detail

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception

The constructor method calls all other methods in the program

Parameters:

args - Unused

Throws:

java.lang.Exception - on connection error

buildJSONUrl

private static java.lang.String buildJSONUrl(java.lang.String baseUrl)

This method builds the full JSON url by adding the formatted date to the base url

Parameters:

baseUrl - The base of the url without the date

Returns:

The full url of the JSON file

chooseImageSize

private static int chooseImageSize(int[] sizeOptions)

This method chooses an appropriate image size from a list of options based on which is closest to the user's display resolution.

Parameters:

sizeOptions - The available options for image size

Returns:

int This returns the chosen image width

getUrl

private static java.lang.String getUrl(java.lang.String jsonUrl,
                                       int displayWidth)
                                throws java.lang.Exception

This methods downloads and parses the provided JSON file, and locates the url of the appropriate image.

Parameters:

jsonUrl - The base url string

displayWidth - The width of user's display

Returns:

String This returns the url as a string.

Throws:

java.lang.Exception - on connection error

downloadImage

private static java.lang.String downloadImage(java.lang.String strImageUrl)

This method takes the url of the image and downloads it to the user's filesystem in a specified location.

Parameters:

strImageUrl - The url location of the image

Returns:

String This returns the file path of the downloaded image

changeDesktopBackground

private static void changeDesktopBackground(java.lang.String path)

This method changes the user's desktop background to the image located at the specified path

Parameters:

path - The path of the image to be used

createFilePath

private static java.lang.String createFilePath()

This method determines the exact file path of the downloaded image primarily based on the current date.

Returns:

String This returns the full filepath of the new image