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1   package org.apache.maven.model.path;
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 javax.inject.Named;
23  import javax.inject.Singleton;
24  
25  /**
26   * Normalizes a URL.
27   *
28   * @author Benjamin Bentmann
29   */
30  @Named
31  @Singleton
32  public class DefaultUrlNormalizer
33      implements UrlNormalizer
34  {
35  
36      @Override
37      public String normalize( String url )
38      {
39          String result = url;
40  
41          if ( result != null )
42          {
43              while ( true )
44              {
45                  int idx = result.indexOf( "/../" );
46                  if ( idx < 0 )
47                  {
48                      break;
49                  }
50                  else if ( idx == 0 )
51                  {
52                      result = result.substring( 3 );
53                      continue;
54                  }
55                  int parent = idx - 1;
56                  while ( parent >= 0 && result.charAt( parent ) == '/' )
57                  {
58                      parent--;
59                  }
60                  parent = result.lastIndexOf( '/', parent );
61                  if ( parent < 0 )
62                  {
63                      result = result.substring( idx + 4 );
64                  }
65                  else
66                  {
67                      result = result.substring( 0, parent ) + result.substring( idx + 3 );
68                  }
69              }
70          }
71  
72          return result;
73      }
74  
75  }