72 lines
1.9 KiB
Java
72 lines
1.9 KiB
Java
/**
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*
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*/
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package org.gcube.portlets.widgets.workspaceuploader.client.uploader;
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/**
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*
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* @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it Aug 6, 2015
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*/
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public class GenerateUUID {
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private static final char[] CHARS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".toCharArray();
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/**
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* Generate a random uuid of the specified length. Example: uuid(15) returns
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* "VcydxgltxrVZSTV"
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*
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* @param len
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* the desired number of characters
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*/
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public static String get(int len) {
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return get(len, CHARS.length);
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}
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/**
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* Generate a random uuid of the specified length, and radix. Examples:
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* <ul>
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* <li>uuid(8, 2) returns "01001010" (8 character ID, base=2)
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* <li>uuid(8, 10) returns "47473046" (8 character ID, base=10)
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* <li>uuid(8, 16) returns "098F4D35" (8 character ID, base=16)
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* </ul>
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*
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* @param len
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* the desired number of characters
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* @param radix
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* the number of allowable values for each character (must be <=
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* 62)
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*/
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public static String get(int len, int radix) {
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if (radix > CHARS.length) {
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throw new IllegalArgumentException();
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}
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char[] uuid = new char[len];
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// Compact form
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for (int i = 0; i < len; i++) {
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uuid[i] = CHARS[(int) (Math.random() * radix)];
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}
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return new String(uuid);
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}
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/**
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* Generate a RFC4122, version 4 ID. Example:
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* "92329D39-6F5C-4520-ABFC-AAB64544E172"
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*/
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public static String get() {
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char[] uuid = new char[36];
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int r;
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// rfc4122 requires these characters
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uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
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uuid[14] = '4';
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// Fill in random data. At i==19 set the high bits of clock sequence as
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// per rfc4122, sec. 4.1.5
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for (int i = 0; i < 36; i++) {
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if (uuid[i] == 0) {
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r = (int) (Math.random() * 16);
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uuid[i] = CHARS[(i == 19) ? (r & 0x3) | 0x8 : r & 0xf];
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}
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}
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return new String(uuid);
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}
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} |