| /* |
| * Copyright 2014 Open Networking Laboratory |
| * |
| * Licensed 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.onlab.util; |
| |
| import com.google.common.base.Strings; |
| import com.google.common.primitives.UnsignedLongs; |
| import com.google.common.util.concurrent.ThreadFactoryBuilder; |
| |
| import java.io.BufferedReader; |
| import java.io.File; |
| import java.io.FileReader; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.ThreadFactory; |
| |
| public abstract class Tools { |
| |
| private Tools() { |
| } |
| |
| /** |
| * Returns a thread factory that produces threads named according to the |
| * supplied name pattern. |
| * |
| * @param pattern name pattern |
| * @return thread factory |
| */ |
| public static ThreadFactory namedThreads(String pattern) { |
| return new ThreadFactoryBuilder().setNameFormat(pattern).build(); |
| } |
| |
| /** |
| * Converts a string from hex to long. |
| * |
| * @param string hex number in string form; sans 0x |
| * @return long value |
| */ |
| public static long fromHex(String string) { |
| return UnsignedLongs.parseUnsignedLong(string, 16); |
| } |
| |
| /** |
| * Converts a long value to hex string; 16 wide and sans 0x. |
| * |
| * @param value long value |
| * @return hex string |
| */ |
| public static String toHex(long value) { |
| return Strings.padStart(UnsignedLongs.toString(value, 16), 16, '0'); |
| } |
| |
| /** |
| * Converts a long value to hex string; 16 wide and sans 0x. |
| * |
| * @param value long value |
| * @param width string width; zero padded |
| * @return hex string |
| */ |
| public static String toHex(long value, int width) { |
| return Strings.padStart(UnsignedLongs.toString(value, 16), width, '0'); |
| } |
| |
| /** |
| * Suspends the current thread for a specified number of millis. |
| * |
| * @param ms number of millis |
| */ |
| public static void delay(int ms) { |
| try { |
| Thread.sleep(ms); |
| } catch (InterruptedException e) { |
| throw new RuntimeException("Interrupted", e); |
| } |
| } |
| |
| /** |
| * Slurps the contents of a file into a list of strings, one per line. |
| * |
| * @param path file path |
| * @return file contents |
| */ |
| public static List<String> slurp(File path) { |
| try (BufferedReader br = new BufferedReader(new FileReader(path))) { |
| List<String> lines = new ArrayList<>(); |
| String line; |
| while ((line = br.readLine()) != null) { |
| lines.add(line); |
| } |
| return lines; |
| |
| } catch (IOException e) { |
| return null; |
| } |
| } |
| |
| } |