/* The contents of this file are subject to the terms
* of the Common Development and Distribution License
* (the License). You may not use this file except in
* compliance with the License.
*
* You can obtain a copy of the License at
* http://www.sun.com/cddl/cddl.html or
* install_dir/legal/LICENSE
* See the License for the specific language governing
* permission and limitations under the License.
*
* When distributing Covered Code, include this CDDL
* Header Notice in each file and include the License file
* at install_dir/legal/LICENSE.
* If applicable, add the following below the CDDL Header,
* with the fields enclosed by brackets [] replaced by
* your own identifying information:
* "Portions Copyrighted [year] [name of copyright owner]"
*
* $Id$
*
* Copyright 2005-2009 Sun Microsystems Inc. All Rights Reserved
*/
package com.sun.faban.driver.util;
import java.util.HashSet;
/**
* Username generator. This is still experimental.
*
* @author Akara Sucharitakul
*/
public class User {
private static final char[] alpha =
{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R',
'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
'u', 'v', 'w', 'x', 'y', 'z'};
private static final char[] characs =
{'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
private static final char[][][] scramble = {{{'0'}}, {{'0'}},
{{'s', 'k', 'u', 'p', 'n', 't', 'j', 'z', 'b', 'g', 'q', 'l', 'w', 'd',
'v', 'y', 'm', 'f', 'x', 'i', 'c', 'h', 'r', 'o', 'e', 'a'},
{'w', '_', 'q', 'l', 'z', 'h', 'j', 'k', '1', '6', 'e', '5', '4', 't', 'b',
'2', 'p', 'r', 'g', 'm', '8', '3', 'c', 'u', '7', 'v', 'i', 'y', 'o', 'a',
'x', 'n', '0', '9', 's', 'd', 'f'},
{'8', '7', '2', 'm', 'l', 's', 'q', '6', '1', 'j', 'b', 'n', '3', 'i', '_',
'w', 'a', 'z', '4', 'x', 'e', 'f', '9', 'c', 'g', 't', 'h', '0', 'd', 'y',
'k', 'v', 'u', 'p', 'r', '5', 'o'}},
{{'q', 'c', 'r', 'p', 'm', 'o', 'n', 'y', 't', 'x', 'a', 'k', 'l', 's',
'e', 'g', 'z', 'h', 'w', 'j', 'v', 'u', 'b', 'f', 'i', 'd'},
{'0', 'g', 'l', '8', 'f', 'p', 'x', 'q', 'm', '6', 's', 'y', 'c', '2', '7',
'e', '4', '5', 'v', 'b', 'z', 'i', 'd', 'h', '1', 'n', '3', '9', 'w', 'o',
'_', 'r', 'j', 't', 'k', 'u', 'a'},
{'5', 'e', '0', '4', 'j', 'd', 'a', 'b', 'g', 'w', 'n', 'v', '3', 'u', '9',
'x', 'i', 'c', 'h', 'q', 'y', 'r', '_', 'm', 't', '6', '8', '2', 'l', 'k',
'p', '7', 's', 'o', 'z', 'f', '1'},
{'r', 'v', 'g', 'a', '0', 'w', 't', '7', '5', '_', 'o', '6', 'f', 'z', 'j',
'2', 'c', 'e', '4', '1', 's', 'y', 'p', '8', 'n', 'u', '3', 'l', 'k', 'h',
'd', 'b', 'q', 'x', 'i', '9', 'm'}},
{{'p', 's', 'c', 'o', 'r', 't', 'u', 'i', 'k', 'q', 'v', 'e', 'f', 'x',
'n', 'j', 'y', 'w', 'z', 'd', 'a', 'b', 'g', 'm', 'l', 'h'},
{'i', 'f', 'w', '0', '5', 'p', '7', 'o', '6', 'z', '8', 'h', 't', '2', '4',
'u', 'a', 'x', 'r', 's', '9', 'v', 'k', 'j', 'e', 'g', '3', 'q', 'm', '1',
'l', 'y', 'd', 'n', '_', 'c', 'b'},
{'n', 'z', 'q', 'd', '8', '1', '5', 'o', 'b', 'u', 'e', 'a', 'c', '2', 'y',
'w', 'k', '9', 'i', '7', 'h', '_', '3', '0', 'j', 'g', 'l', 'm', 'p', 's',
'v', 't', '4', 'x', '6', 'f', 'r'},
{'f', 'd', '5', 't', 'j', 'e', 'h', 'q', 'u', 'c', 'b', 'w', 'l', 'k', 'a',
'n', 'r', 'm', '1', 'o', '_', 'y', '6', 's', '7', 'g', 'i', '2', '0', 'p',
'x', 'v', '3', '4', 'z', '9', '8'},
{'4', 'm', 'q', 'o', '9', 'v', 'z', 'w', '7', '6', '5', '8', 'f', 'g', 'd',
'a', 'p', 'j', '1', '_', 'y', '3', 'h', 'r', 't', 'c', 'n', 'l', '0', 'e',
'k', 'b', 'x', 'i', '2', 's', 'u'}},
{{'r', 'b', 'd', 'm', 'f', 't', 'x', 'e', 'i', 'o', 's', 'p', 'a', 'l',
'g', 'h', 'n', 'w', 'z', 'q', 'u', 'v', 'k', 'j', 'c', 'y'},
{'h', 'i', 'b', 'f', '2', 'o', 'd', 'u', '7', '9', 'w', 'v', 'j', '3', '6',
'g', 'z', 'p', 'n', '8', 'y', 'k', 'x', 'q', '5', 's', 't', 'a', '1', '4',
'0', 'e', 'c', 'm', 'r', 'l', '_'},
{'y', '3', 'w', 'h', 'v', 'u', 'e', 'q', 'm', 'z', '9', 'x', 'k', '7', 'p',
'r', 't', 'n', '4', 'f', 'o', '2', '5', 'i', 'l', 'a', '6', '8', 'g', '1',
'_', 'b', 'd', '0', 's', 'j', 'c'},
{'6', 'c', 'f', '3', '2', 'v', 'm', 'l', 'x', 'k', 'e', '_', '7', 'a', 's',
'0', 'j', 'n', 'd', 'z', 'u', '4', 't', 'o', 'g', '5', 'w', 'h', 'p', 'b',
'i', '1', 'q', '8', 'r', 'y', '9'},
{'i', 'e', 'p', 'g', 'h', 'b', '1', 'a', 'x', 'm', 'o', '7', 'l', 'u', 'z',
'w', '0', '8', '9', 'd', 'f', '2', '_', '5', 'c', 'n', 'r', '6', 'j', 'v',
'q', 't', 's', '4', 'k', '3', 'y'},
{'t', 'n', 'v', 'g', 's', 'j', 'p', 'l', 'b', '8', 'd', '_', 'q', 'u', 'z',
'2', '5', '7', 'x', 'i', 'o', 'r', '9', '0', 'f', 'w', 'k', '6', '4', '3',
'e', 'c', 'a', 'h', 'm', '1', 'y'}},
{{'q', 'o', 'x', 'j', 'g', 'r', 'k', 'p', 'a', 'e', 'i', 'w', 'u', 'n',
's', 'f', 'c', 'b', 'z', 'y', 't', 'v', 'm', 'h', 'l', 'd'},
{'z', 'g', 'm', '7', 'r', 'l', 'o', 'q', 't', '0', '9', 'b', 'w', '3', '2',
'y', '1', 'e', 'p', 's', '6', 'x', '5', 'v', 'i', 'n', '_', '4', 'a', 'k',
'u', 'f', 'c', 'd', 'h', 'j', '8'},
{'1', '9', 'c', 't', 'p', 'm', 'e', '5', 'f', 'y', 'r', 'g', 'w', 'j', 'i',
'x', '3', 'u', '8', '6', 'd', 'k', 's', '4', 'b', 'l', 'h', 'q', 'n', '7',
'2', 'z', 'a', 'o', '0', 'v', '_'},
{'g', 'v', 'r', 'l', 'h', 'a', '4', '0', 'k', '_', '2', 'j', 'b', 't', 'p',
'i', 'z', '5', '7', 'm', '3', '1', 'w', 'e', '6', 'u', 'f', 'y', '9', 'n',
'x', 'o', 'c', 'd', 's', 'q', '8'},
{'q', 'u', '0', '4', 'f', 'j', 'r', 'w', '8', '9', 't', 'k', 'h', '2', 'i',
'b', 'n', 'g', 'z', 'x', '3', 'd', 'e', 'a', 's', '6', '1', '5', 'v', 'o',
'_', 'l', 'm', 'y', 'c', 'p', '7'},
{'b', '7', 'x', 'r', 'a', '8', 'z', 'm', 'q', 'i', 't', 'v', 'c', 'd', '6',
'j', 'k', 'y', '0', '9', 'f', '3', '2', 'h', 's', 'w', 'l', '1', 'u', '_',
'g', 'o', 'e', 'n', 'p', '5', '4'},
{'v', 'j', '1', 'n', '8', 's', '_', 'q', 'u', 'e', '3', 'c', 'o', '9', 'm',
'h', 't', '0', 'f', '4', 'd', 'r', '5', 'x', '2', '6', 'w', 'a', 'i', 'z',
'7', 'b', 'l', 'k', 'g', 'y', 'p'}},
{{'o', 'g', 'l', 'k', 'e', 'q', 'r', 'p', 't', 'w', 'u', 'h', 'j', 'a',
'i', 'v', 'd', 'y', 'z', 'b', 'c', 'm', 'x', 'n', 'f', 's'},
{'3', 'y', 'f', 't', '6', 'q', 'z', 'r', 'b', '1', 'j', '0', '7', '2', '_',
'a', 'g', '9', '4', 'l', 'v', 'd', 'c', 'm', 'o', 'i', 'k', '8', '5', 'x',
'w', 'n', 'h', 'u', 'p', 'e', 's'},
{'d', 'v', 'l', 'b', 'j', '5', 'y', '8', 'o', 'p', '0', 'q', 'x', 'u', 's',
'w', '7', '3', 'h', 't', '_', 'n', '2', 'c', 'm', 'r', '6', 'g', 'k', 'z',
'e', '1', 'f', '9', '4', 'i', 'a'},
{'a', 'f', 'y', 'o', 'w', 'z', 'b', 'i', 'd', '7', '_', 'm', 's', 'p', '1',
'4', 'x', 'l', 'r', '9', 'j', 'q', 'k', 'v', '6', 'g', '3', 't', 'h', 'e',
'2', '0', 'n', '5', '8', 'u', 'c'},
{'r', 'c', 'q', 'x', '1', 'a', 'u', '7', 'k', '8', 'p', '0', '9', 'f', 'j',
'n', 'b', '3', 'z', 'o', '_', 'd', 'v', '4', 'g', 'i', 's', 'e', 'w', 'y',
'2', 'm', 't', '5', 'h', '6', 'l'},
{'s', '_', '2', 'v', 'z', 'f', '1', '7', 'k', 'o', 'd', '6', '8', 'j', 'i',
'q', '0', 'x', 'a', 'm', 'r', 't', 'w', 'h', 'y', 'n', 'l', 'u', 'c', 'p',
'g', '4', '9', '3', '5', 'e', 'b'},
{'u', '5', 'h', 'x', 'y', 'a', '4', '8', 'z', 'i', 'g', 's', '2', 'n', 'p',
'b', 'q', 'o', '6', '1', '0', 'w', 'e', '3', '_', 'j', 'v', '9', 'k', 'm',
'd', 'r', 't', '7', 'f', 'l', 'c'},
{'t', 'z', 'n', 'y', '6', 'm', 'i', 'w', 'c', '2', 'f', 'q', 'e', 'h', '_',
'v', 'j', '9', '0', '8', 's', '5', 'g', 'd', 'p', 'l', '4', 'u', 'o', '1',
'k', '3', 'r', 'b', 'a', 'x', '7'}}};
// Note that these sum up to 100
private static final int[] length_percent = { 0, 0, 5, 8, 17, 25, 24, 21 };
private static int[] selector = new int[length_percent.length];
static {
selector[0] = length_percent[0];
for (int i = 1; i < selector.length; i++)
selector[i] = selector[i - 1] + length_percent[i];
}
/**
* Creates a unique user name from an id.
* @param id The id
* @return A unique user name
*/
public static String getUserName(long id) {
// Since id starts with 1, we have to shift it to start with 0 for
// our operations.
--id;
// We divide the ids into sets, each set has 100 employees.
int setId = (int) (id / 100);
// Then we obtain the per-set id 0..99
int psid = (int) (id % 100);
// For selection, we do not want to make the same name lengths
// contigous. So we switch the digits on psid.
psid = (psid % 10) * 10 + (psid / 10);
// Even then, the shorter names tend to clutter in the lower range
// close to 1 and the longer in the upper close to 100. Distributing
// odd and even numbers will correct this tendency.
if (psid % 2 == 0)
psid = 99 - psid;
// This outcoming psid is used for digit selection.
// Next, choose the length.
int lengthSequence = 0; // This is the sequence number for the psid
// having this length within these 100 names.
int len; // For now, pretend 0 is OK, but we'll shift is back to 1.
for (len = 0; len < selector.length; len++) {
if (psid < selector[len]) {
if (len == 0)
lengthSequence = psid;
else
lengthSequence = psid - selector[len - 1];
break;
}
}
// Here we shift it back so len is from 1 to whatever.
++len;
// Now as we know the id, psid, and the name length to use,
// we have to generate the name.
char[] name = new char[len];
int[] offset = new int[len];
// The lengthId is the unique identifier for this length and is the
// value we use to get the name.
int lengthId = length_percent[len - 1] * setId + lengthSequence;
for (int i = 0; i < len; i++) {
offset[i] = lengthId % scramble[len - 1][i].length;
lengthId /= scramble[len - 1][i].length;
}
name[0] = scramble[len - 1][0][offset[0]];
for (int i = 1; i < len; i++) {
offset[i] = (offset[i] + offset[i - 1]) %
scramble[len - 1][i].length;
name[i] = scramble[len - 1][i][offset[i]];
}
return new String(name);
}
/**
* Test code for the user name.
* @param args The test command line arguments
*/
public static void main(String[] args) {
long limit = Long.parseLong(args[0]);
int[] nameLength = new int[8];
HashSet<String> set = new HashSet<String>((int) (limit - 1));
for (long i = 1; i <= limit; i++) {
String name = getUserName(i);
System.out.println("User " + i + ": " + name);
++nameLength[name.length() - 1];
if (!set.add(name))
System.out.println("Alert! Duplicate name: " + name);
}
long count = 0;
for (int i = 0; i < nameLength.length; i++) {
count += nameLength[i];
}
for (int i = 0; i < nameLength.length; i++) {
System.out.println("Length " + (i + 1) + ", count " +
nameLength[i] + ", " + (100d * nameLength[i]/count) + "%");
}
}
}