71 lines
2.2 KiB
Java
71 lines
2.2 KiB
Java
package fr.pandacube.lib.util;
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import java.nio.charset.StandardCharsets;
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import java.util.Objects;
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import java.util.Scanner;
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import java.util.UUID;
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/**
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* Utility class and program that generate offline UUIDs for provided player names.
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* <p>
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* You can generate the UUID programmatically using {@link #getFromNickName(String)} and
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* {@link #getFromNickNames(String[])}.
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*
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* To use this class as a program, type
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* <pre>
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* java -cp<anyClassPathContainingThisClass> fr.pandacube.lib.util.OfflineUUID [playernames...]
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* </pre>
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* Each argument will be interpreted as a player name. If there is no argument, the program will wait for them in the
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* input stream.
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* For each player name, the program will print the player name, a {@code tab} character, the UUID and a line separator.
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*/
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public class OfflineUUID {
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/**
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* Generate the offline {@link UUID} of the provided player name.
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* @param nickname the player name to obtain the offline UUID from.
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* @return the offline {@link UUID} of the provided player name.
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*/
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public static UUID getFromNickName(String nickname) {
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byte[] from_str = ("OfflinePlayer:" + nickname).getBytes(StandardCharsets.UTF_8);
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return UUID.nameUUIDFromBytes(from_str);
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}
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/**
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* Generate the offline {@link UUID}s of the provided player names.
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* @param nicknames an array of player name to obtain the offline UUIDs from.
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* @return the offline {@link UUID}s of the provided player name in an array, at the same order as the input.
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*/
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public static UUID[] getFromNickNames(String[] nicknames) {
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Objects.requireNonNull(nicknames);
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UUID[] uuids = new UUID[nicknames.length];
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for (int i = 0; i < nicknames.length; i++)
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uuids[i] = getFromNickName(nicknames[i]);
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return uuids;
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}
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/**
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* Main method for this class.
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* @param args the arguments. One argument is one player name.
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*/
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public static void main(String[] args) {
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if (args.length == 0) {
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try (Scanner s = new Scanner(System.in)) {
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for(;;) {
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System.err.print("Please input a player name: ");
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if (!s.hasNextLine())
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break;
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String line = s.nextLine();
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System.out.println(line + "\t" + getFromNickName(line));
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}
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}
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}
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else {
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for (String arg : args)
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System.out.println(arg + "\t" + getFromNickName(arg));
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}
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}
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}
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