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1 /*
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2 * AliasingDocuDirCache -- DocuDirCache using alias entries from config file
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3 *
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4 * Digital Image Library servlet components
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5 *
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6 * Copyright (C) 2003 Robert Casties (robcast@mail.berlios.de)
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7 *
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8 * This program is free software; you can redistribute it and/or modify it
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9 * under the terms of the GNU General Public License as published by the Free
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10 * Software Foundation; either version 2 of the License, or (at your option)
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11 * any later version.
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12 *
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13 * Please read license.txt for the full details. A copy of the GPL may be found
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14 * at http://www.gnu.org/copyleft/lgpl.html
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15 *
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16 * You should have received a copy of the GNU General Public License along with
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17 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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18 * Place, Suite 330, Boston, MA 02111-1307 USA
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19 *
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20 * Created on 04.11.2003
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21 */
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22
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23 package digilib.io;
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24
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25 import java.io.File;
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26 import java.util.HashMap;
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27 import java.util.Iterator;
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28
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29 /**
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30 * @author casties
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31 *
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32 */
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33 public class AliasingDocuDirCache extends DocuDirCache {
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34
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35 /**
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36 * @param baseDirs
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37 * @param fileClasses
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38 * @param confFileName
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39 * @throws FileOpException
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40 */
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41 public AliasingDocuDirCache(
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42 String[] baseDirs,
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43 int[] fileClasses,
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44 String confFileName)
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45 throws FileOpException {
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46 // create standard DocuDirCache
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47 super(baseDirs, fileClasses);
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48 HashMap pathMap = null;
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49 // read alias config file
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50 try {
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51 // create data loader for mapping-file
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52 File confFile = new File(confFileName);
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53 // load into pathMap
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54 XMLListLoader mapLoader =
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55 new XMLListLoader("digilib-aliases", "mapping", "link", "dir");
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56 pathMap = mapLoader.loadURL(confFile.toURL().toString());
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57 } catch (Exception e) {
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58 throw new FileOpException("ERROR loading mapping file: " + e);
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59 }
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60 if (pathMap == null) {
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61 throw new FileOpException("ERROR unable to load mapping file!");
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62 }
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63
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64 /*
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65 * load map entries into cache
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66 */
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67
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68 for (Iterator i = pathMap.keySet().iterator(); i.hasNext();) {
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69 String link = (String)i.next();
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70 String dir = (String) pathMap.get(link);
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71 DocuDirectory destDir = new DocuDirectory(dir, this);
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72 if (destDir.isValid()) {
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73 // add the alias name
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74 putName(link, destDir);
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75 // add the real dir
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76 putDir(destDir);
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77 }
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78 }
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79 }
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80
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81 /** Adds a DocuDirectory under another name to the cache.
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82 *
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83 * @param name
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84 * @param newdir
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85 */
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86 public void putName(String name, DocuDirectory newdir) {
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87 if (map.containsKey(name)) {
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181
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88 logger.warn("Baah, duplicate key in AliasingDocuDirCache.put!");
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176
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89 } else {
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90 map.put(name, newdir);
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91 }
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92 }
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93
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94 }
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