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      1 /**
      2  * Copyright (c) 2004-2011 QOS.ch
      3  * All rights reserved.
      4  *
      5  * Permission is hereby granted, free  of charge, to any person obtaining
      6  * a  copy  of this  software  and  associated  documentation files  (the
      7  * "Software"), to  deal in  the Software without  restriction, including
      8  * without limitation  the rights to  use, copy, modify,  merge, publish,
      9  * distribute,  sublicense, and/or sell  copies of  the Software,  and to
     10  * permit persons to whom the Software  is furnished to do so, subject to
     11  * the following conditions:
     12  *
     13  * The  above  copyright  notice  and  this permission  notice  shall  be
     14  * included in all copies or substantial portions of the Software.
     15  *
     16  * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
     17  * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
     18  * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
     19  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     20  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     21  * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
     22  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     23  *
     24  */
     25 package org.slf4j.migrator.helper;
     26 
     27 import java.util.Random;
     28 
     29 public class RandomHelper {
     30 
     31     private Random random = new Random(100);
     32     final char folderSeparator;
     33 
     34     RandomHelper(char folderSeparator) {
     35         this.folderSeparator = folderSeparator;
     36     }
     37 
     38     private String randomString(int len) {
     39         StringBuilder buf = new StringBuilder();
     40         for (int i = 0; i < len; i++) {
     41             int offset = random.nextInt(26);
     42             char c = (char) ('a' + offset);
     43             buf.append(c);
     44         }
     45         return buf.toString();
     46     }
     47 
     48     int nextInt(int n) {
     49         return random.nextInt(n);
     50     }
     51 
     52     String buildRandomFileName(int averageNodeLength, int totalLength) {
     53         StringBuilder buf = new StringBuilder();
     54         int MAX_NODE_LENGTH = averageNodeLength * 2;
     55         while (buf.length() < totalLength) {
     56             int remaining = totalLength - buf.length();
     57             int currentNodeLength;
     58             if (remaining > MAX_NODE_LENGTH) {
     59                 currentNodeLength = random.nextInt(MAX_NODE_LENGTH) + 1;
     60                 buf.append(randomString(currentNodeLength));
     61                 buf.append('/');
     62             } else {
     63                 currentNodeLength = remaining;
     64                 buf.append(randomString(currentNodeLength));
     65             }
     66         }
     67         return buf.toString();
     68     }
     69 
     70 }
     71