/**
* 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();
}
}