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1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  
28  package org.apache.http.cookie;
29  
30  import java.io.Serializable;
31  import java.util.Comparator;
32  
33  import org.apache.http.annotation.Immutable;
34  
35  /**
36   * This cookie comparator can be used to compare identity of cookies.
37   * <p>
38   *  Cookies are considered identical if their names are equal and
39   *  their domain attributes match ignoring case.
40   *
41   * @since 4.0
42   */
43  @Immutable
44  public class CookieIdentityComparator implements Serializable, Comparator<Cookie> {
45  
46      private static final long serialVersionUID = 4466565437490631532L;
47  
48      @Override
49      public int compare(final Cookie c1, final Cookie c2) {
50          int res = c1.getName().compareTo(c2.getName());
51          if (res == 0) {
52              // do not differentiate empty and null domains
53              String d1 = c1.getDomain();
54              if (d1 == null) {
55                  d1 = "";
56              } else if (d1.indexOf('.') == -1) {
57                  d1 = d1 + ".local";
58              }
59              String d2 = c2.getDomain();
60              if (d2 == null) {
61                  d2 = "";
62              } else if (d2.indexOf('.') == -1) {
63                  d2 = d2 + ".local";
64              }
65              res = d1.compareToIgnoreCase(d2);
66          }
67          if (res == 0) {
68              String p1 = c1.getPath();
69              if (p1 == null) {
70                  p1 = "/";
71              }
72              String p2 = c2.getPath();
73              if (p2 == null) {
74                  p2 = "/";
75              }
76              res = p1.compareTo(p2);
77          }
78          return res;
79      }
80  
81  }