package org.springblade.common.utils.sms;
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/**
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* 字符串工具类。
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*
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* @author carver.gu
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* @since 1.0, Sep 12, 2009
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*/
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public abstract class StringUtils {
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private StringUtils() {}
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/**
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* 检查指定的字符串是否为空。
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* <ul>
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* <li>SysUtils.isEmpty(null) = true</li>
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* <li>SysUtils.isEmpty("") = true</li>
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* <li>SysUtils.isEmpty(" ") = true</li>
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* <li>SysUtils.isEmpty("abc") = false</li>
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* </ul>
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*
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* @param value 待检查的字符串
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* @return true/false
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*/
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public static boolean isEmpty(String value) {
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int strLen;
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if (value == null || (strLen = value.length()) == 0) {
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return true;
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}
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for (int i = 0; i < strLen; i++) {
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if ((Character.isWhitespace(value.charAt(i)) == false)) {
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return false;
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}
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}
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return true;
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}
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/**
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* 检查对象是否为数字型字符串,包含负数开头的。
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*/
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public static boolean isNumeric(Object obj) {
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if (obj == null) {
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return false;
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}
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char[] chars = obj.toString().toCharArray();
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int length = chars.length;
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if(length < 1) {
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return false;
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}
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int i = 0;
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if(length > 1 && chars[0] == '-') {
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i = 1;
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}
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for (; i < length; i++) {
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if (!Character.isDigit(chars[i])) {
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return false;
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}
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}
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return true;
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}
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/**
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* 检查指定的字符串列表是否不为空。
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*/
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public static boolean areNotEmpty(String... values) {
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boolean result = true;
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if (values == null || values.length == 0) {
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result = false;
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} else {
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for (String value : values) {
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result &= !isEmpty(value);
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}
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}
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return result;
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}
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/**
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* 把通用字符编码的字符串转化为汉字编码。
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*/
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public static String unicodeToChinese(String unicode) {
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StringBuilder out = new StringBuilder();
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if (!isEmpty(unicode)) {
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for (int i = 0; i < unicode.length(); i++) {
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out.append(unicode.charAt(i));
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}
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}
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return out.toString();
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}
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/**
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* 过滤不可见字符
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*/
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public static String stripNonValidXMLCharacters(String input) {
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if (input == null || ("".equals(input))) {
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return "";
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}
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StringBuilder out = new StringBuilder();
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char current;
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for (int i = 0; i < input.length(); i++) {
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current = input.charAt(i);
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if ((current == 0x9) || (current == 0xA) || (current == 0xD)
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|| ((current >= 0x20) && (current <= 0xD7FF))
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|| ((current >= 0xE000) && (current <= 0xFFFD))
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|| ((current >= 0x10000) && (current <= 0x10FFFF))) {
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out.append(current);
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}
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}
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return out.toString();
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}
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public static String leftPad(String str, int size, char padChar) {
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if (str == null) {
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return null;
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} else {
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int pads = size - str.length();
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if (pads <= 0) {
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return str;
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} else {
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return pads > 8192 ? leftPad(str, size, String.valueOf(padChar)) : padding(pads, padChar).concat(str);
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}
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}
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}
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public static String leftPad(String str, int size, String padStr) {
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if (str == null) {
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return null;
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} else {
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if (isEmpty(padStr)) {
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padStr = " ";
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}
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int padLen = padStr.length();
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int strLen = str.length();
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int pads = size - strLen;
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if (pads <= 0) {
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return str;
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} else if (padLen == 1 && pads <= 8192) {
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return leftPad(str, size, padStr.charAt(0));
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} else if (pads == padLen) {
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return padStr.concat(str);
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} else if (pads < padLen) {
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return padStr.substring(0, pads).concat(str);
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} else {
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char[] padding = new char[pads];
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char[] padChars = padStr.toCharArray();
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for(int i = 0; i < pads; ++i) {
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padding[i] = padChars[i % padLen];
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}
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return (new String(padding)).concat(str);
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}
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}
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}
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private static String padding(int repeat, char padChar) throws IndexOutOfBoundsException {
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if (repeat < 0) {
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throw new IndexOutOfBoundsException("Cannot pad a negative amount: " + repeat);
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} else {
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char[] buf = new char[repeat];
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for(int i = 0; i < buf.length; ++i) {
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buf[i] = padChar;
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}
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return new String(buf);
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}
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}
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}
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