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1   package org.apache.maven.wagon;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *   http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  /**
23   * Utility class for common operations for file/directory permissions.
24   *
25   * @author <a href="mailto:juam at users.sourceforge.net">Juan F. Codagnone</a>
26   * @see PermissionModeUtils
27   * @since Sep 3, 2005
28   */
29  public final class PermissionModeUtils
30  {
31      private PermissionModeUtils()
32      {
33      }
34      
35      /**
36       * See the System Interfaces volume of IEEE Std 1003.1-2001, umask(1)
37       *
38       * @param modeStr permission mode (numeric or symbolic)
39       * @return the mode that can be used with umask to accomplish modeStr.
40       */
41      public static String getUserMaskFor( String modeStr )
42      {
43          String ret = null;
44  
45          try
46          {
47              int mode = Integer.valueOf( modeStr, 8 ).intValue();
48  
49              mode = mode % 8 + ( ( mode / 8 ) % 8 ) * 8 + ( ( mode / 64 ) % 8 ) * 64;
50  
51              // CHECKSTYLE_OFF: MagicNumber
52              ret = Integer.toOctalString( 0777 - mode );
53              // CHECKSTYLE_ON: MagicNumber
54          }
55          catch ( final NumberFormatException e )
56          {
57              try
58              {
59                  Integer.parseInt( modeStr );
60              }
61              catch ( final NumberFormatException e1 )
62              {
63                  ret = modeStr;
64              }
65          }
66  
67          if ( ret == null )
68          {
69              throw new IllegalArgumentException( "The mode is a number but is not octal" );
70          }
71  
72          return ret;
73      }
74  }