1   /**
2    * Copyright (c) 2000-2008 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  
35  import java.util.List;
36  
37  import org.jdom.IllegalDataException;
38  
39  /**
40   * <a href="RSSUtil.java.html"><b><i>View Source</i></b></a>
41   *
42   * @author Brian Wing Shun Chan
43   *
44   */
45  public class RSSUtil {
46  
47      public static final String RSS = "rss";
48  
49      public static final double[] RSS_VERSIONS = new double[] {
50          0.9, 0.91, 0.93, 0.94, 1.0, 2.0
51      };
52  
53      public static final String ATOM = "atom";
54  
55      public static final double[] ATOM_VERSIONS = new double[] {0.3, 1.0};
56  
57      public static final String DEFAULT_TYPE = ATOM;
58  
59      public static final double DEFAULT_VERSION = 1.0;
60  
61      public static final String DISPLAY_STYLE_ABSTRACT = "abstract";
62  
63      public static final String DISPLAY_STYLE_FULL_CONTENT = "full-content";
64  
65      public static final String DISPLAY_STYLE_TITLE = "title";
66  
67      public static String export(SyndFeed feed)
68          throws FeedException, IOException {
69  
70          feed.setEncoding("UTF-8");
71  
72          SyndFeedOutput output = new SyndFeedOutput();
73  
74          try {
75              return output.outputString(feed);
76          }
77          catch (IllegalDataException ide) {
78  
79              // LEP-4450
80  
81              _regexpStrip(feed);
82  
83              return output.outputString(feed);
84          }
85      }
86  
87      private static void _regexpStrip(SyndFeed feed) {
88          feed.setTitle(_regexpStrip(feed.getTitle()));
89          feed.setDescription(_regexpStrip(feed.getDescription()));
90  
91          List entries = feed.getEntries();
92  
93          for (int i = 0; i < entries.size(); i++) {
94              SyndEntry entry = (SyndEntry)entries.get(i);
95  
96              entry.setTitle(_regexpStrip(entry.getTitle()));
97  
98              SyndContent content = entry.getDescription();
99  
100             content.setValue(_regexpStrip(content.getValue()));
101         }
102     }
103 
104     private static String _regexpStrip(String text) {
105         text = Normalizer.normalizeToAscii(text);
106 
107         char[] array = text.toCharArray();
108 
109         for (int i = 0; i < array.length; i++) {
110             String s = String.valueOf(array[i]);
111 
112             if (!s.matches(_REGEXP_STRIP)) {
113                 array[i] = CharPool.SPACE;
114             }
115         }
116 
117         return new String(array);
118     }
119 
120     private static final String _REGEXP_STRIP = "[\\d\\w]";
121 
122 }