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1   /**
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.commons.cli;
19  
20  /**
21   * Contains useful helper methods for classes within this package.
22   *
23   * @version $Id: Util.java 1443102 2013-02-06 18:12:16Z tn $
24   */
25  final class Util
26  {
27      /**
28       * Remove the hyphens from the beginning of <code>str</code> and
29       * return the new String.
30       *
31       * @param str The string from which the hyphens should be removed.
32       *
33       * @return the new String.
34       */
35      static String stripLeadingHyphens(String str)
36      {
37          if (str == null)
38          {
39              return null;
40          }
41          if (str.startsWith("--"))
42          {
43              return str.substring(2, str.length());
44          }
45          else if (str.startsWith("-"))
46          {
47              return str.substring(1, str.length());
48          }
49  
50          return str;
51      }
52  
53      /**
54       * Remove the leading and trailing quotes from <code>str</code>.
55       * E.g. if str is '"one two"', then 'one two' is returned.
56       *
57       * @param str The string from which the leading and trailing quotes
58       * should be removed.
59       *
60       * @return The string without the leading and trailing quotes.
61       */
62      static String stripLeadingAndTrailingQuotes(String str)
63      {
64          int length = str.length();
65          if (length > 1 && str.startsWith("\"") && str.endsWith("\"") && str.substring(1, length - 1).indexOf('"') == -1)
66          {
67              str = str.substring(1, length - 1);
68          }
69          
70          return str;
71      }
72  }