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1   package org.apache.maven.wagon.providers.ssh;
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  import org.apache.maven.wagon.TransferFailedException;
23  
24  import java.io.BufferedReader;
25  import java.io.IOException;
26  import java.io.StringReader;
27  import java.util.ArrayList;
28  import java.util.List;
29  import java.util.regex.Matcher;
30  import java.util.regex.Pattern;
31  
32  /**
33   * Parser for the output of <code>ls</code> command from any ssh server on any OS.
34   *
35   * @author <a href="mailto:joakim@erdfelt.com">Joakim Erdfelt</a>
36   *
37   */
38  public class LSParser
39  {
40      /**
41       * output samples see LSParserTest:
42       * <ul></ul>
43       * <li>osx      "-rw-r--r--   1 joakim  joakim  1194 Dec 11     09:25 pom.xml"</li>
44       * <li>osx fr : "-rw-r--r--   1 olamy   staff   19   21  sep    00:34 more-resources.dat"</li>
45       * <li>cygwin : "drwxr-xr-x+  5 joakim  None    0    Dec 11     10:30 pom.xml"</li>
46       * <li>linux :  "-rw-r--r--   1 joakim  joakim  1194 2006-12-11 09:25 pom.xml"</li>
47       * </ul>
48       */
49      private static final Pattern PATTERN = Pattern.compile( ".+\\s+[0-9]+\\s+.+\\s+.+\\s+[0-9]+\\s+"
50                                                                  //2006-12-11
51                                                                  + "([0-9]{4}-[0-9]{2}-[0-9]{2}"
52                                                                  // Dec 11
53                                                                  + "|.+\\s+[0-9]+"
54                                                                  // 21 sep
55                                                                  + "|.+\\s+.+)"
56                                                                  // 09:25 pom.xml
57                                                                  + "\\s+[0-9:]+\\s+(.+?)" );
58  
59      /**
60       * Parse a raw "ls -FlA", and obtain the list of files.
61       *
62       * @param rawLS the raw LS to parse.
63       * @return the list of files found.
64       * @throws TransferFailedException
65       * @todo use ls -1a and do away with the method all together
66       */
67      public List<String> parseFiles( String rawLS )
68          throws TransferFailedException
69      {
70          List<String> ret = new ArrayList<String>();
71          try
72          {
73              BufferedReader br = new BufferedReader( new StringReader( rawLS ) );
74  
75              String line = br.readLine();
76  
77              while ( line != null )
78              {
79                  line = line.trim();
80  
81                  Matcher m = PATTERN.matcher( line );
82                  if ( m.matches() )
83                  {
84                      ret.add( m.group( 2 ) );
85                  }
86                  line = br.readLine();
87              }
88          }
89          catch ( IOException e )
90          {
91              throw new TransferFailedException( "Error parsing file listing.", e );
92          }
93  
94          return ret;
95      }
96  }