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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.Iterator;
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27 import java.util.Map;
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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(File confFile) throws FileOpException {
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42 // create standard DocuDirCache
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43 super();
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44 Map pathMap = null;
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45 // read alias config file
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46 try {
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47 // load into pathMap
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48 XMLListLoader mapLoader = new XMLListLoader("digilib-aliases",
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49 "mapping", "link", "dir");
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50 pathMap = mapLoader.loadURL(confFile.toURL().toString());
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51 } catch (Exception e) {
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52 throw new FileOpException("ERROR loading mapping file: " + e);
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53 }
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54 if (pathMap == null) {
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55 throw new FileOpException("ERROR: unable to load mapping file!");
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56 }
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57
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58 /*
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59 * load map entries into cache
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60 */
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61
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62 for (Iterator i = pathMap.keySet().iterator(); i.hasNext();) {
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63 String link = FileOps.normalName((String) i.next());
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64 String dn = (String) pathMap.get(link);
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65 File dir = FileOps.getRealFile(dn);
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66 if (dir.isDirectory()) {
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67 logger.debug("Aliasing dir: " + link);
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68 DigiDirectory destDir = new DigiDirectory(dir, dn, null);
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69 // add the alias name
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70 putName(link, destDir);
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71 // add the real dir
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72 putDir(destDir);
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73 }
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74 }
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75 }
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76
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77 /**
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78 * Adds a DocuDirectory under another name to the cache.
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79 *
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80 * @param name
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81 * @param newdir
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82 */
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83 public void putName(String name, DigiDirectory newdir) {
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84 Object oldkey = map.put(name, newdir);
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85 if (oldkey != null) {
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86 logger
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87 .warn("Duplicate key in AliasingDocuDirCache.put -- replaced!");
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88 }
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89 }
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90
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91 }
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