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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.maven.internal.impl;
20  
21  import org.apache.maven.api.di.Named;
22  import org.apache.maven.api.di.Singleton;
23  import org.apache.maven.api.services.model.UrlNormalizer;
24  
25  /**
26   * Normalizes a URL.
27   *
28   */
29  @Named
30  @Singleton
31  public class DefaultUrlNormalizer implements UrlNormalizer {
32  
33      @Override
34      public String normalize(String url) {
35          String result = url;
36  
37          if (result != null) {
38              while (true) {
39                  int idx = result.indexOf("/../");
40                  if (idx < 0) {
41                      break;
42                  } else if (idx == 0) {
43                      result = result.substring(3);
44                      continue;
45                  }
46                  int parent = idx - 1;
47                  while (parent >= 0 && result.charAt(parent) == '/') {
48                      parent--;
49                  }
50                  parent = result.lastIndexOf('/', parent);
51                  if (parent < 0) {
52                      result = result.substring(idx + 4);
53                  } else {
54                      result = result.substring(0, parent) + result.substring(idx + 3);
55                  }
56              }
57          }
58  
59          return result;
60      }
61  }