| /* |
| * 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.logging.log4j.util; |
| |
| /** |
| * <em>Consider this class private.</em> |
| */ |
| public final class Chars { |
| |
| /** Carriage Return. */ |
| public static final char CR = '\r'; |
| |
| /** Double Quote. */ |
| public static final char DQUOTE = '\"'; |
| |
| /** Equals '='. */ |
| public static final char EQ = '='; |
| |
| /** Line Feed. */ |
| public static final char LF = '\n'; |
| |
| /** NUL. */ |
| public static final char NUL = 0; |
| |
| /** Single Quote [']. */ |
| public static final char QUOTE = '\''; |
| |
| /** Space. */ |
| public static final char SPACE = ' '; |
| |
| /** Tab. */ |
| public static final char TAB = '\t'; |
| |
| /** |
| * Converts a digit into an upper-case hexadecimal character or the null character if invalid. |
| * |
| * @param digit a number 0 - 15 |
| * @return the hex character for that digit or '\0' if invalid |
| */ |
| public static char getUpperCaseHex(final int digit) { |
| if (digit < 0 || digit >= 16) { |
| return '\0'; |
| } |
| return digit < 10 ? getNumericalDigit(digit) : getUpperCaseAlphaDigit(digit); |
| } |
| |
| /** |
| * Converts a digit into an lower-case hexadecimal character or the null character if invalid. |
| * |
| * @param digit a number 0 - 15 |
| * @return the hex character for that digit or '\0' if invalid |
| */ |
| public static char getLowerCaseHex(final int digit) { |
| if (digit < 0 || digit >= 16) { |
| return '\0'; |
| } |
| return digit < 10 ? getNumericalDigit(digit) : getLowerCaseAlphaDigit(digit); |
| } |
| |
| private static char getNumericalDigit(final int digit) { |
| return (char) ('0' + digit); |
| } |
| |
| private static char getUpperCaseAlphaDigit(final int digit) { |
| return (char) ('A' + digit - 10); |
| } |
| |
| private static char getLowerCaseAlphaDigit(final int digit) { |
| return (char) ('a' + digit - 10); |
| } |
| |
| private Chars() { |
| } |
| } |