1   /**
2    * Distribution License:
3    * JSword is free software; you can redistribute it and/or modify it under
4    * the terms of the GNU Lesser General Public License, version 2.1 as published by
5    * the Free Software Foundation. This program is distributed in the hope
6    * that it will be useful, but WITHOUT ANY WARRANTY; without even the
7    * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
8    * See the GNU Lesser General Public License for more details.
9    *
10   * The License is available on the internet at:
11   *       http://www.gnu.org/copyleft/lgpl.html
12   * or by writing to:
13   *      Free Software Foundation, Inc.
14   *      59 Temple Place - Suite 330
15   *      Boston, MA 02111-1307, USA
16   *
17   * Copyright: 2005
18   *     The copyright to this program is held by it's authors.
19   *
20   * ID: $Id: IndexDownloader.java 2021 2010-11-25 03:31:42Z dmsmith $
21   */
22  package org.crosswire.jsword.util;
23  
24  import java.io.IOException;
25  import java.net.URI;
26  
27  import org.crosswire.common.util.NetUtil;
28  import org.crosswire.jsword.book.Book;
29  import org.crosswire.jsword.book.BookException;
30  import org.crosswire.jsword.book.install.InstallException;
31  import org.crosswire.jsword.book.install.Installer;
32  import org.crosswire.jsword.index.IndexManager;
33  import org.crosswire.jsword.index.IndexManagerFactory;
34  import org.crosswire.jsword.index.IndexStatus;
35  
36  /**
37   * .
38   * 
39   * @see gnu.lgpl.License for license details.<br>
40   *      The copyright to this program is held by it's authors.
41   * @author Joe Walker [joe at eireneh dot com]
42   */
43  public final class IndexDownloader {
44      /**
45       * Prevent instantiation
46       */
47      private IndexDownloader() {
48      }
49  
50      /**
51       * Download and install a search index
52       * 
53       * @param book
54       *            The book to get an index for
55       */
56      public static void downloadIndex(Book book, Installer installer) throws IOException, InstallException, BookException {
57          // Get a temp home
58          URI tempDownload = NetUtil.getTemporaryURI(TEMP_PREFIX, TEMP_SUFFIX);
59  
60          IndexStatus finalStatus = IndexStatus.UNDONE;
61          try {
62              // Now we know what installer to use, download to the temp file
63              installer.downloadSearchIndex(book, tempDownload);
64  
65              // And install from that file.
66              IndexManager idxman = IndexManagerFactory.getIndexManager();
67              book.setIndexStatus(IndexStatus.CREATING);
68              idxman.installDownloadedIndex(book, tempDownload);
69              finalStatus = IndexStatus.DONE;
70          } finally {
71              book.setIndexStatus(finalStatus);
72              // tidy up after ourselves
73              if (tempDownload != null) {
74                  NetUtil.delete(tempDownload);
75              }
76          }
77      }
78  
79      /**
80       * Temp file prefix
81       */
82      private static final String TEMP_PREFIX = "jsword-index";
83  
84      /**
85       * Temp file suffix
86       */
87      private static final String TEMP_SUFFIX = "dat";
88  }
89