org.apache.flink.runtime.util.FileUtils Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.runtime.util;
/**
* This is a utility class to deal with temporary files.
*/
public final class FileUtils {
/**
* The alphabet to construct the random part of the filename from.
*/
private static final char[] ALPHABET = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', 'a', 'b', 'c', 'd',
'e', 'f' };
/**
* The length of the random part of the filename.
*/
private static final int LENGTH = 12;
/**
* Empty private constructor to avoid instantiation.
*/
private FileUtils() {
}
/**
* Constructs a random filename with the given prefix and
* a random part generated from hex characters.
*
* @param prefix
* the prefix to the filename to be constructed
* @return the generated random filename with the given prefix
*/
public static String getRandomFilename(final String prefix) {
final StringBuilder stringBuilder = new StringBuilder(prefix);
for (int i = 0; i < LENGTH; i++) {
stringBuilder.append(ALPHABET[(int) Math.floor(Math.random() * (double) ALPHABET.length)]);
}
return stringBuilder.toString();
}
}