| /* |
| 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.commons.cli; |
| |
| /** |
| * Validates an Option string. |
| * |
| * @since 1.1 |
| */ |
| final class OptionValidator { |
| /** |
| * Returns whether the specified character is a valid character. |
| * |
| * @param c the character to validate |
| * @return true if {@code c} is a letter. |
| */ |
| private static boolean isValidChar(final char c) { |
| return Character.isJavaIdentifierPart(c); |
| } |
| |
| /** |
| * Returns whether the specified character is a valid Option. |
| * |
| * @param c the option to validate |
| * @return true if {@code c} is a letter, '?' or '@', otherwise false. |
| */ |
| private static boolean isValidOpt(final char c) { |
| return isValidChar(c) || c == '?' || c == '@'; |
| } |
| |
| /** |
| * Validates whether {@code opt} is a permissible Option shortOpt. The rules that specify if the {@code opt} |
| * is valid are: |
| * |
| * <ul> |
| * <li>a single character {@code opt} that is either ' '(special case), '?', '@' or a letter</li> |
| * <li>a multi character {@code opt} that only contains letters.</li> |
| * </ul> |
| * <p> |
| * In case {@code opt} is {@code null} no further validation is performed. |
| * |
| * @param option The option string to validate, may be null |
| * @throws IllegalArgumentException if the Option is not valid. |
| */ |
| static String validate(final String option) throws IllegalArgumentException { |
| // if opt is NULL do not check further |
| if (option == null) { |
| return null; |
| } |
| |
| // handle the single character opt |
| if (option.length() == 1) { |
| final char ch = option.charAt(0); |
| |
| if (!isValidOpt(ch)) { |
| throw new IllegalArgumentException("Illegal option name '" + ch + "'"); |
| } |
| } else { |
| // handle the multi character opt |
| for (final char ch : option.toCharArray()) { |
| if (!isValidChar(ch)) { |
| throw new IllegalArgumentException("The option '" + option + "' contains an illegal " + "character : '" + ch + "'"); |
| } |
| } |
| } |
| return option; |
| } |
| } |