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903
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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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906
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37 * beans. <br>
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38 * errorImgFileName: image file to send in case of error. <br>
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39 * denyImgFileName: image file to send if access is denied. <br>
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40 * baseDirs: array of base directories in order of preference (prescaled
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41 * versions first). <br>
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42 * useAuth: use authentication information. <br>
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43 * authConfPath: authentication configuration file. <br>
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44 * ... <br>
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903
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45 *
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46 * @author casties
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906
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47 *
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903
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48 */
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906
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49 public class DigilibConfiguration extends ParameterMap {
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903
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50
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906
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51 /** DocuImage class instance */
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52 protected static Class<DocuImageImpl> docuImageClass = null;
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903
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53
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906
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54 /** Log4J logger */
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55 protected Logger logger = Logger.getLogger("digilib.config");
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903
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56
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906
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57 /**
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58 * Default constructor defines all parameters and their default values.
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59 *
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60 */
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61 public DigilibConfiguration() {
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62 super(20);
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63 // we start with a default logger config
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64 BasicConfigurator.configure();
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65 initParams();
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66 }
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903
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67
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906
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68 /** Definition of parameters and default values.
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903
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69 *
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70 */
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906
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71 protected void initParams() {
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72 /*
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73 * Definition of parameters and default values. System parameters that
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74 * are not read from config file have a type 's'.
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75 */
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76 // digilib servlet version
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77 newParameter("digilib.version", "2.0b1", null, 's');
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78 // DocuImage class instance
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79 newParameter("servlet.docuimage.class",
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80 digilib.image.ImageLoaderDocuImage.class, null, 's');
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81 // sending image files as-is allowed
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82 newParameter("sendfile-allowed", Boolean.TRUE, null, 'f');
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83 // Type of DocuImage instance
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84 newParameter("docuimage-class", "digilib.image.ImageLoaderDocuImage", null, 'f');
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85 // degree of subsampling on image load
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86 newParameter("subsample-minimum", new Float(2f), null, 'f');
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87 // default scaling quality
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88 newParameter("default-quality", new Integer(1), null, 'f');
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89 // maximum destination image size (0 means no limit)
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90 newParameter("max-image-size", new Integer(0), null, 'f');
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91 // allow image toolkit to use disk cache
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92 newParameter("img-diskcache-allowed", Boolean.TRUE, null, 'f');
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93 // default type of error message (image, text, code)
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94 newParameter("default-errmsg-type", "image", null, 'f');
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903
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95
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906
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96 // initialise static DocuImage class instance
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97 try {
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98 DigilibConfiguration.docuImageClass = (Class<DocuImageImpl>) Class.forName(getAsString("docuimage-class"));
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99 } catch (ClassNotFoundException e) {
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100 logger.error("Unable to set docuImageClass!");
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101 }
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102 }
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103
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104 /**
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105 * Creates a new DocuImage instance.
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106 *
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107 * The type of DocuImage is specified by docuimage-class.
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108 *
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109 * @return DocuImage
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110 */
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903
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111 public static DocuImage getDocuImageInstance() {
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906
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112 DocuImageImpl di = null;
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113 try {
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114 di = docuImageClass.newInstance();
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115 } catch (Exception e) {
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116 }
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117 return di;
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118 }
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903
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119
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906
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120 /**
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903
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121 * Check image size and type and store in ImageFile imgf
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122 *
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906
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123 * @param imgf
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124 * @return
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125 * @throws IOException
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126 */
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127 public static ImageInput identifyDocuImage(ImageInput imgf)
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128 throws IOException {
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129 // use fresh DocuImage instance
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130 DocuImage di = getDocuImageInstance();
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131 return di.identify(imgf);
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132 }
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903
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133
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906
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134 /**
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135 * @return Returns the docuImageClass.
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136 */
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137 public static Class<DocuImageImpl> getDocuImageClass() {
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138 return docuImageClass;
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139 }
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140
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141 /**
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142 * @param docuImageClass
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143 * The docuImageClass to set.
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144 */
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145 public static void setDocuImageClass(Class<DocuImageImpl> dic) {
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146 docuImageClass = dic;
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147 }
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903
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148 }
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