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RandomHelper.java
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RandomHelper.java
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/**
* Copyright (c) 2004-2011 QOS.ch
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
package org.slf4j.migrator.helper;
import java.util.Random;
public class RandomHelper {
private final Random random = new Random(100);
final char folderSeparator;
RandomHelper(char folderSeparator) {
this.folderSeparator = folderSeparator;
}
private String randomString(int len) {
StringBuilder buf = new StringBuilder();
for (int i = 0; i < len; i++) {
int offset = random.nextInt(26);
char c = (char) ('a' + offset);
buf.append(c);
}
return buf.toString();
}
int nextInt(int n) {
return random.nextInt(n);
}
String buildRandomFileName(int averageNodeLength, int totalLength) {
StringBuilder buf = new StringBuilder();
int MAX_NODE_LENGTH = averageNodeLength * 2;
while (buf.length() < totalLength) {
int remaining = totalLength - buf.length();
int currentNodeLength;
if (remaining > MAX_NODE_LENGTH) {
currentNodeLength = random.nextInt(MAX_NODE_LENGTH) + 1;
buf.append(randomString(currentNodeLength));
buf.append('/');
} else {
currentNodeLength = remaining;
buf.append(randomString(currentNodeLength));
}
}
return buf.toString();
}
}