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