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1 /*
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2 * DigilibConfiguration -- Holding all parameters for digilib servlet.
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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) 2001, 2002 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 */
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21
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22 package digilib.servlet;
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23
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24 import java.io.IOException;
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25
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26 import org.apache.log4j.BasicConfigurator;
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27 import org.apache.log4j.Logger;
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28
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29 import digilib.image.DocuImage;
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30 import digilib.image.DocuImageImpl;
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31 import digilib.io.ImageInput;
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32 import digilib.util.ParameterMap;
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33
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34 /**
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35 * Class to hold the digilib servlet configuration parameters. The parameters
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36 * can be read from the digilib-config file and be passed to other servlets or
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37 * beans. <br>errorImgFileName: image file to send in case of error. <br>
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38 * denyImgFileName: image file to send if access is denied. <br>baseDirs:
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39 * array of base directories in order of preference (prescaled versions first).
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40 * <br>useAuth: use authentication information. <br>authConfPath:
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41 * authentication configuration file. <br>... <br>
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42 *
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43 * @author casties
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44 *
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45 */
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46 public abstract class DigilibConfiguration extends ParameterMap {
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47
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48 /** DocuImage class instance */
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49 protected static Class<DocuImageImpl> docuImageClass = null;
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50
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51 /** Log4J logger */
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52 protected Logger logger = Logger.getLogger("digilib.config");
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53
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54 /**
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55 * Default constructor defines all parameters and their default values.
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56 *
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57 */
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58 public DigilibConfiguration() {
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59 super(20);
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60 // we start with a default logger config
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61 BasicConfigurator.configure();
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62 initParams();
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63 }
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64
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65 /**
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66 *
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67 */
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68 protected void initParams() {
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69 /*
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70 * Definition of parameters and default values. System parameters that
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71 * are not read from config file have a type 's'.
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72 */
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73 }
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74
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75 /**
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76 * Creates a new DocuImage instance.
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77 *
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78 * The type of DocuImage is specified by docuimage-class.
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79 *
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80 * @return DocuImage
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81 */
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82 public static DocuImage getDocuImageInstance() {
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83 DocuImageImpl di = null;
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84 try {
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85 di = docuImageClass.newInstance();
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86 } catch (Exception e) {
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87 }
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88 return di;
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89 }
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90
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91 /**
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92 * Check image size and type and store in ImageFile imgf
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93 *
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94 * @param imgf
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95 * @return
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96 * @throws IOException
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97 */
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98 public static ImageInput identifyDocuImage(ImageInput imgf) throws IOException {
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99 // use fresh DocuImage instance
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100 DocuImage di = getDocuImageInstance();
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101 return di.identify(imgf);
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102 }
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103
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104 /**
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105 * @return Returns the docuImageClass.
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106 */
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107 public static Class<DocuImageImpl> getDocuImageClass() {
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108 return docuImageClass;
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109 }
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110
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111 /**
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112 * @param docuImageClass The docuImageClass to set.
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113 */
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114 public static void setDocuImageClass(Class<DocuImageImpl> dic) {
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115 docuImageClass = dic;
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116 }
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117 }
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