1   /**
2    * Copyright (c) 2000-2007 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.util;
24  
25  import com.liferay.portal.kernel.util.CharPool;
26  
27  import com.sun.syndication.feed.synd.SyndContent;
28  import com.sun.syndication.feed.synd.SyndEntry;
29  import com.sun.syndication.feed.synd.SyndFeed;
30  import com.sun.syndication.io.FeedException;
31  import com.sun.syndication.io.SyndFeedOutput;
32  
33  import java.io.IOException;
34  import java.io.StringWriter;
35  
36  import java.util.List;
37  
38  import org.jdom.IllegalDataException;
39  
40  /**
41   * <a href="RSSUtil.java.html"><b><i>View Source</i></b></a>
42   *
43   * @author Brian Wing Shun Chan
44   *
45   */
46  public class RSSUtil {
47  
48      public static final String RSS = "rss";
49  
50      public static final double[] RSS_VERSIONS = new double[] {
51          0.9, 0.91, 0.93, 0.94, 1.0, 2.0
52      };
53  
54      public static final String ATOM = "atom";
55  
56      public static final double[] ATOM_VERSIONS = new double[] {0.3, 1.0};
57  
58      public static final String DEFAULT_TYPE = ATOM;
59  
60      public static final double DEFAULT_VERSION = 1.0;
61  
62      public static String export(SyndFeed feed)
63          throws FeedException, IOException {
64  
65          feed.setEncoding("UTF-8");
66  
67          StringWriter writer = new StringWriter();
68  
69          SyndFeedOutput output = new SyndFeedOutput();
70  
71          try {
72              return output.outputString(feed);
73          }
74          catch (IllegalDataException ide) {
75  
76              // LEP-4450
77  
78              _regexpStrip(feed);
79  
80              return output.outputString(feed);
81          }
82      }
83  
84      private static void _regexpStrip(SyndFeed feed) {
85          feed.setTitle(_regexpStrip(feed.getTitle()));
86          feed.setDescription(_regexpStrip(feed.getDescription()));
87  
88          List entries = feed.getEntries();
89  
90          for (int i = 0; i < entries.size(); i++) {
91              SyndEntry entry = (SyndEntry)entries.get(i);
92  
93              entry.setTitle(_regexpStrip(entry.getTitle()));
94  
95              SyndContent content = entry.getDescription();
96  
97              content.setValue(_regexpStrip(content.getValue()));
98          }
99      }
100 
101     private static String _regexpStrip(String text) {
102         text = Normalizer.normalizeToAscii(text);
103 
104         char[] array = text.toCharArray();
105 
106         for (int i = 0; i < array.length; i++) {
107             String s = String.valueOf(array[i]);
108 
109             if (!s.matches(_REGEXP_STRIP)) {
110                 array[i] = CharPool.SPACE;
111             }
112         }
113 
114         return new String(array);
115     }
116 
117     private static final String _REGEXP_STRIP = "[\\d\\w]";
118 
119 }