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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 org.codehaus.plexus.component.annotations.Component;
23  
24  /**
25   * Normalizes a URL.
26   * 
27   * @author Benjamin Bentmann
28   */
29  @Component( role = UrlNormalizer.class )
30  public class DefaultUrlNormalizer
31      implements UrlNormalizer
32  {
33  
34      public String normalize( String url )
35      {
36          String result = url;
37  
38          if ( result != null )
39          {
40              result = result.replaceAll( "(?<![:/])/+", "/" );
41  
42              while ( true )
43              {
44                  int idx = result.indexOf( "/../" );
45                  if ( idx <= 0 )
46                  {
47                      break;
48                  }
49                  int parent = result.lastIndexOf( '/', idx - 1 );
50                  if ( parent < 0 )
51                  {
52                      break;
53                  }
54                  result = result.substring( 0, parent ) + result.substring( idx + 3 );
55              }
56          }
57  
58          return result;
59      }
60  
61  }