| /** |
| * 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.hadoop.fs.slive; |
| |
| /** |
| * Simple slive helper methods (may not exist in 0.20) |
| */ |
| class Helper { |
| |
| private Helper() { |
| |
| } |
| |
| private static final String[] emptyStringArray = {}; |
| |
| /** |
| * Splits strings on comma and trims accordingly |
| * |
| * @param str |
| * @return array of split |
| */ |
| static String[] getTrimmedStrings(String str) { |
| if (null == str || "".equals(str.trim())) { |
| return emptyStringArray; |
| } |
| return str.trim().split("\\s*,\\s*"); |
| } |
| |
| /** |
| * Converts a byte value into a useful string for output |
| * |
| * @param bytes |
| * |
| * @return String |
| */ |
| static String toByteInfo(long bytes) { |
| StringBuilder str = new StringBuilder(); |
| if (bytes < 0) { |
| bytes = 0; |
| } |
| str.append(bytes); |
| str.append(" bytes or "); |
| str.append(bytes / 1024); |
| str.append(" kilobytes or "); |
| str.append(bytes / (1024 * 1024)); |
| str.append(" megabytes or "); |
| str.append(bytes / (1024 * 1024 * 1024)); |
| str.append(" gigabytes"); |
| return str.toString(); |
| } |
| |
| /** |
| * Stringifys an array using the given separator. |
| * |
| * @param args |
| * the array to format |
| * @param sep |
| * the separator string to use (ie comma or space) |
| * |
| * @return String representing that array |
| */ |
| static String stringifyArray(Object[] args, String sep) { |
| StringBuilder optStr = new StringBuilder(); |
| for (int i = 0; i < args.length; ++i) { |
| optStr.append(args[i]); |
| if ((i + 1) != args.length) { |
| optStr.append(sep); |
| } |
| } |
| return optStr.toString(); |
| } |
| |
| } |