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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  package org.apache.commons.cli;
18  
19  /***
20   * Contains useful helper methods for classes within this package.
21   *
22   * @author John Keyes (john at integralsource.com)
23   */
24  class Util {
25  
26      /***
27       * <p>Remove the hyphens from the begining of <code>str</code> and
28       * return the new String.</p>
29       *
30       * @param str The string from which the hyphens should be removed.
31       *
32       * @return the new String.
33       */
34      static String stripLeadingHyphens(String str)
35      {
36          if (str == null) {
37              return null;
38          }
39          if (str.startsWith("--"))
40          {
41              return str.substring(2, str.length());
42          }
43          else if (str.startsWith("-"))
44          {
45              return str.substring(1, str.length());
46          }
47  
48          return str;
49      }
50  
51      /***
52       * Remove the leading and trailing quotes from <code>str</code>.
53       * E.g. if str is '"one two"', then 'one two' is returned.
54       *
55       * @param str The string from which the leading and trailing quotes
56       * should be removed.
57       *
58       * @return The string without the leading and trailing quotes.
59       */
60      static String stripLeadingAndTrailingQuotes(String str)
61      {
62          if (str.startsWith("\"")) {
63              str = str.substring(1, str.length());
64          }
65          if (str.endsWith("\"")) {
66              str = str.substring(0, str.length()-1);
67          }
68          return str;
69      }
70  }