public static void main(String[] args)
throws FileNotFoundException, InvalidMidiDataException, IOException,
MidiUnavailableException {
displayWelcomeMessage();
createUserID();
displayUserManual();
library.displayAllLibrarySongs();
executeUserCommand();
}
/**
* Prompt the user for input and interpret the command recieved.
*
* @throws MidiUnavailableException, InvalidMidiDataException
*/
public static void executeUserCommand()
throws MidiUnavailableException, InvalidMidiDataException {
while (true) {
System.out.println();
System.out.print("Enter User Command. (Type 'quit' to quit) ");
System.out.println();
InputStreamReader isr = new java.io.InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
try {
String userInput = br.readLine();
// the userInput is evaluated to different functions encased in
// the following if blocks.
// some functions take in user input and evaluates what the user
// wants by separating it into different sections
if (userInput.equals("quit")) {
Execution.quit(player);
Execution.writePlaylistsToFile(library);
break;
} else if (userInput.startsWith("create playlist") && userInput.endsWith(")")) {
library = Execution.createPlaylist(userInput, library);
Execution.writePlaylistsToFile(library);
} else if (userInput.startsWith("play playlist")) {
String[] userInputSplited = userInput.split(" ");
String playlist = userInputSplited[2];
if (userInputSplited.length == 4 & userInput.matches(".*\\d.*")) {
// When input length is 4, then play specified song that
// user inputs
int songIndex;
try {
songIndex = Integer.parseInt(userInputSplited[3]) - 1;
} catch (NumberFormatException nfe) {
System.out.println(
"Please enter a valid index that is in this playlist. Please try again.");
continue;
}
try {
player = Execution.playPlaylistSong(library, player, playlist, songIndex);
} catch (IndexOutOfBoundsException iobe) {
System.out.println(
"Please enter a valid index that is in this playlist. Please try again.");
continue;
} catch (NullPointerException e) {
System.out.println("Playlist does not exist. Please try again.");
continue;
}
} else if (userInputSplited.length == 3 | (!userInput.matches(".*\\d.*"))) {
// if command does not contain integer, play entire
// playlist
Playlist pl;
pl = library.findPlaylist(playlist);
// checks if playlist exists
if (pl == null) {
System.out.println("Playlist does not exist. Please try again.");
continue;
}
for (int i = 0; i < pl.numberOfSongs(); i++) {
// plays the playlist songs one by one
try {
player = Execution.playPlaylistSong(library, player, pl, i);
} catch (IOException e) {
System.out.println("Midi file not available!");
}
player.checkIfRunning();
}
}
} else if (userInput.startsWith("delete playlist")) {
library = Execution.deletePlaylist(library, userInput);
} else if (userInput.startsWith("find songs by")) {
library = Execution.findSongByArtist(library, userInput);
} else if (userInput.startsWith("play song")) {
String[] userInputSplited = userInput.split(" ");
int songIndex;
try {
songIndex = Integer.parseInt(userInputSplited[2]) - 1;
} catch (NumberFormatException nfe) {
// the user input can only be an integer
System.out.println("Please enter a song index!");
continue;
}
try {
player = Execution.playSong(library, player, songIndex);
} catch (IndexOutOfBoundsException iobe) {
System.out.println("Song does not exist, please try again.");
continue;
}
} else if (userInput.startsWith("delete song")) {
String[] userInputSplited = userInput.split(" ");
int songIndex;
System.out.println(
"Are you sure you want to permanently remove this song?(yes to confirm, type anything to return to menu)");
String confirm = br.readLine().trim();
// additional layer of confirmation, in case of accidental
// deletion
if (confirm.equals("yes")) {
try {
songIndex = Integer.parseInt(userInputSplited[2]) - 1;
} catch (NumberFormatException nfe) {
System.out.println("Please enter a song index!");
continue;
}
try {
library.delSong(songIndex);
library = Execution.readPlaylistXml(library);
library.displayAllLibrarySongs();
library.displayAllLibraryPlaylists();
} catch (IndexOutOfBoundsException iobe) {
System.out.println("Song does not exist, please try again.");
continue;
}
}
} else if (userInput.startsWith("play random")) {
// User may enter any of the three commands that begin with
// play random
// each is encased in an if block
List<Integer> indexes;
if (userInput.equals("play random for all")) {
int numberOfSongs = library.numberOfSongs();
indexes = new ArrayList<Integer>();
for (int i = 0; i < numberOfSongs; i++) {
indexes.add(i);
}
player = Execution.playRandom(library, player, indexes);
} else if (userInput.startsWith("play random") & userInput.endsWith(")")) {
// When user wants to play specified songs randomly
String[] userInputSplited = userInput.split(" ");
userInputSplited =
userInputSplited[2].substring(1, userInputSplited[2].length() - 1).split(",");
ArrayList<String> tempList = new ArrayList<String>(Arrays.asList(userInputSplited));
indexes = new ArrayList<Integer>(tempList.size());
for (String i : tempList) {
if (Integer.valueOf(i) > library.numberOfSongs()) {
System.out.println(
"the song of index "
+ Integer.valueOf(i)
+ " does not exist in your music libaray.");
} else {
indexes.add(Integer.valueOf(i) - 1);
}
}
player = Execution.playRandom(library, player, indexes);
} else if (userInput.startsWith("play random playlist")) {
String[] userInputSplited = userInput.split(" ");
// The 4th element in list is the playlist that user
// wants to play randomly
String playlist = userInputSplited[3];
Playlist pl = library.findPlaylist(playlist);
try {
indexes = new ArrayList<Integer>(pl.numberOfSongs());
} catch (NullPointerException npe) {
System.out.println("Playlist " + playlist + " does not exist. Please try again.");
continue;
}
for (int n = 0; n < pl.numberOfSongs(); n++) {
indexes.add(n);
}
player = Execution.playRandom(library, player, pl, indexes);
}
} else if (userInput.startsWith("download")) {
String title = userInput.split("download ")[1];
library.downloadSong(title);
} else if (userInput.startsWith("display jcloud songs")) {
library.displayJcloudSongs();
} else if (userInput.startsWith("get downloaded songs")) {
library.downloadPreviousSongs();
library.displayAllLibrarySongs();
} else if (userInput.equals("display songs")) {
library.displayAllLibrarySongs();
} else if (userInput.equals("display library")) {
library.displayAllLibrarySongs();
library.displayAllLibraryPlaylists();
} else if (userInput.equals("display playlists")) {
library.displayAllLibraryPlaylists();
// Shows nothing when no playlist have been created
} else if (userInput.equals("help")) {
displayUserManual();
} else if (userInput.contains("pause")) {
try {
player.pause();
} catch (NullPointerException e) {
continue;
}
} else if (userInput.contains("resume")) {
try {
player.resume();
} catch (NullPointerException e) {
continue;
}
} else {
System.out.println(
"Invalid command. Please pay attention to input format and try again!");
}
} catch (IOException e) {
e.printStackTrace();
}
}
}