StringUtil.java
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上传日期:2021-06-03
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- /*
- This file is part of the OdinMS Maple Story Server
- Copyright (C) 2008 Patrick Huy <patrick.huy@frz.cc>
- Matthias Butz <matze@odinms.de>
- Jan Christian Meyer <vimes@odinms.de>
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU Affero General Public License version 3
- as published by the Free Software Foundation. You may not use, modify
- or distribute this program under any other version of the
- GNU Affero General Public License.
- This program 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 Affero General Public License for more details.
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
- package net.sf.odinms.tools;
- /**
- * Provides a suite of utilities for manipulating strings.
- *
- * @author Frz
- * @since Revision 336
- * @version 1.0
- *
- */
- public class StringUtil {
- /**
- * Gets a string padded from the left to <code>length</code> by
- * <code>padchar</code>.
- *
- * @param in The input string to be padded.
- * @param padchar The character to pad with.
- * @param length The length to pad to.
- * @return The padded string.
- */
- public static String getLeftPaddedStr(String in, char padchar, int length) {
- StringBuilder builder = new StringBuilder(length);
- for (int x = in.getBytes().length; x < length; x++) {
- builder.append(padchar);
- }
- builder.append(in);
- return builder.toString();
- }
- /**
- * Gets a string padded from the right to <code>length</code> by
- * <code>padchar</code>.
- *
- * @param in The input string to be padded.
- * @param padchar The character to pad with.
- * @param length The length to pad to.
- * @return The padded string.
- */
- public static String getRightPaddedStr(String in, char padchar, int length) {
- StringBuilder builder = new StringBuilder(in);
- for (int x = in.getBytes().length; x < length; x++) {
- builder.append(padchar);
- }
- return builder.toString();
- }
- /**
- * Joins an array of strings starting from string <code>start</code> with
- * a space.
- *
- * @param arr The array of strings to join.
- * @param start Starting from which string.
- * @return The joined strings.
- */
- public static String joinStringFrom(String arr[], int start) {
- return joinStringFrom(arr, start, " ");
- }
- /**
- * Joins an array of strings starting from string <code>start</code> with
- * <code>sep</code> as a seperator.
- *
- * @param arr The array of strings to join.
- * @param start Starting from which string.
- * @return The joined strings.
- */
- public static String joinStringFrom(String arr[], int start, String sep) {
- StringBuilder builder = new StringBuilder();
- for (int i = start; i < arr.length; i++) {
- builder.append(arr[i]);
- if (i != arr.length - 1) {
- builder.append(sep);
- }
- }
- return builder.toString();
- }
- /**
- * Makes an enum name human readable (fixes spaces, capitalization, etc)
- *
- * @param enumName The name of the enum to neaten up.
- * @return The human-readable enum name.
- */
- public static String makeEnumHumanReadable(String enumName) {
- StringBuilder builder = new StringBuilder(enumName.length() + 1);
- String[] words = enumName.split("_");
- for (String word : words) {
- if (word.length() <= 2) {
- builder.append(word); // assume that it's an abbrevation
- } else {
- builder.append(word.charAt(0));
- builder.append(word.substring(1).toLowerCase());
- }
- builder.append(' ');
- }
- return builder.substring(0, enumName.length());
- }
- /**
- * Counts the number of <code>chr</code>'s in <code>str</code>.
- *
- * @param str The string to check for instances of <code>chr</code>.
- * @param chr The character to check for.
- * @return The number of times <code>chr</code> occurs in <code>str</code>.
- */
- public static int countCharacters(String str, char chr) {
- int ret = 0;
- for (int i = 0; i < str.length(); i++) {
- if (str.charAt(i) == chr) {
- ret++;
- }
- }
- return ret;
- }
- }