/* * Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software;Designed and Developed mainly by many Chinese * opensource volunteers. you can redistribute it and/or modify it under the * terms of the GNU General Public License version 2 only, as published by the * Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Any questions about this component can be directed to it's project Web address * https://code.google.com/p/opencloudb/. * */ package com.talent.nio.utils; import java.util.ArrayList; import java.util.Formatter; import java.util.List; /** * * * @filename: com.talent.nio.utils.StringUtil * @copyright: Copyright (c)2010 * @company: talent * @author: 谭耀武 * @version: 1.0 * @create time: 2013-9-20 下午6:53:35 * @record <table cellPadding="3" cellSpacing="0" style="width:600px"> * <thead style="font-weight:bold;background-color:#e3e197"> * <tr> * <td>date</td> * <td>author</td> * <td>version</td> * <td>description</td> * </tr> * </thead> <tbody style="background-color:#ffffeb"> * <tr> * <td>2013-9-20</td> * <td>谭耀武</td> * <td>1.0</td> * <td>create</td> * </tr> * </tbody> * </table> */ public final class StringUtil { private StringUtil() { // Unused. } public static final String NEWLINE; static { String newLine; try { newLine = new Formatter().format("%n").toString(); } catch (Exception e) { newLine = "\n"; } NEWLINE = newLine; } /** * Strip an Object of it's ISO control characters. * * @param value * The Object that should be stripped. This objects toString * method will called and the result passed to * {@link #stripControlCharacters(String)}. * @return {@code String} A new String instance with its hexadecimal control * characters replaced by a space. Or the unmodified String if it * does not contain any ISO control characters. */ public static String stripControlCharacters(Object value) { if (value == null) { return null; } return stripControlCharacters(value.toString()); } /** * Strip a String of it's ISO control characters. * * @param value * The String that should be stripped. * @return {@code String} A new String instance with its hexadecimal control * characters replaced by a space. Or the unmodified String if it * does not contain any ISO control characters. */ public static String stripControlCharacters(String value) { if (value == null) { return null; } boolean hasControlChars = false; for (int i = value.length() - 1; i >= 0; i--) { if (Character.isISOControl(value.charAt(i))) { hasControlChars = true; break; } } if (!hasControlChars) { return value; } StringBuilder buf = new StringBuilder(value.length()); int i = 0; // Skip initial control characters (i.e. left trim) for (; i < value.length(); i++) { if (!Character.isISOControl(value.charAt(i))) { break; } } // Copy non control characters and substitute control characters with // a space. The last control characters are trimmed. boolean suppressingControlChars = false; for (; i < value.length(); i++) { if (Character.isISOControl(value.charAt(i))) { suppressingControlChars = true; continue; } else { if (suppressingControlChars) { suppressingControlChars = false; buf.append(' '); } buf.append(value.charAt(i)); } } return buf.toString(); } private static final String EMPTY_STRING = ""; /** * Splits the specified {@link String} with the specified delimiter. This * operation is a simplified and optimized version of * {@link String#split(String)}. */ public static String[] split(String value, char delim) { final int end = value.length(); final List<String> res = new ArrayList<String>(); int start = 0; for (int i = 0; i < end; i++) { if (value.charAt(i) == delim) { if (start == i) { res.add(EMPTY_STRING); } else { res.add(value.substring(start, i)); } start = i + 1; } } if (start == 0) { // If no delimiter was found in the value res.add(value); } else { if (start != end) { // Add the last element if it's not empty. res.add(value.substring(start, end)); } else { // Truncate trailing empty elements. for (int i = res.size() - 1; i >= 0; i--) { if (res.get(i).length() == 0) { res.remove(i); } else { break; } } } } return res.toArray(new String[res.size()]); } public static void main(String[] args) { Formatter formatter = new Formatter(); String xx = formatter.format("%n").toString(); formatter.close(); } }