| /** |
| * 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. |
| * |
| * @author John Keyes ( john at integralsource.com ) |
| */ |
| public class OptionValidator { |
| |
| /** |
| * <p>Validates whether <code>opt</code> is a permissable Option |
| * shortOpt. The rules that specify if the <code>opt</code> |
| * is valid are:</p> |
| * <ul> |
| * <li><code>opt</code> is not NULL</li> |
| * <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> |
| * |
| * @param opt The option string to validate |
| * @throws IllegalArgumentException if the Option is not valid. |
| */ |
| static void validateOption(String opt) |
| throws IllegalArgumentException |
| { |
| // check that opt is not NULL |
| if (opt == null) |
| { |
| return; |
| } |
| |
| // handle the single character opt |
| else if (opt.length() == 1) |
| { |
| char ch = opt.charAt(0); |
| |
| if (!isValidOpt(ch)) |
| { |
| throw new IllegalArgumentException("illegal option value '" + ch |
| + "'"); |
| } |
| } |
| |
| // handle the multi character opt |
| else |
| { |
| char[] chars = opt.toCharArray(); |
| |
| for (int i = 0; i < chars.length; i++) |
| { |
| if (!isValidChar(chars[i])) |
| { |
| throw new IllegalArgumentException( |
| "opt contains illegal character value '" + chars[i] |
| + "'"); |
| } |
| } |
| } |
| } |
| |
| /** |
| * <p>Returns whether the specified character is a valid Option.</p> |
| * |
| * @param c the option to validate |
| * @return true if <code>c</code> is a letter, ' ', '?' or '@', |
| * otherwise false. |
| */ |
| private static boolean isValidOpt(char c) |
| { |
| return (isValidChar(c) || (c == ' ') || (c == '?') || c == '@'); |
| } |
| |
| /** |
| * <p>Returns whether the specified character is a valid character.</p> |
| * |
| * @param c the character to validate |
| * @return true if <code>c</code> is a letter. |
| */ |
| private static boolean isValidChar(char c) |
| { |
| return Character.isJavaIdentifierPart(c); |
| } |
| } |