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1 package digilib.pdf;
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2
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3 import java.io.IOException;
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4 import java.io.OutputStream;
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5 import java.util.concurrent.Callable;
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6 import java.util.concurrent.ExecutionException;
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7 import java.util.concurrent.Future;
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8
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9 import org.apache.log4j.Logger;
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10
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11 import com.itextpdf.text.Document;
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12 import com.itextpdf.text.DocumentException;
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13 import com.itextpdf.text.Image;
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14 import com.itextpdf.text.PageSize;
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15 import com.itextpdf.text.pdf.PdfWriter;
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16
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17 import digilib.image.DocuImage;
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18 import digilib.image.ImageJobDescription;
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19 import digilib.image.ImageWorker;
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20 import digilib.servlet.DigilibConfiguration;
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21 import digilib.servlet.PDFRequest;
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22 import digilib.util.DigilibJobCenter;
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23 import digilib.util.NumRange;
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24
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25 public class PDFStreamWorker implements Callable<OutputStream> {
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26
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27 protected static Logger logger = Logger.getLogger(PDFStreamWorker.class);
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28
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29 protected DigilibConfiguration dlConfig = null;
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30
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31 protected Document doc = null;
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32
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33 protected OutputStream outstream = null;
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34
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35 protected PDFRequest job_info = null;
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36
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37 protected DigilibJobCenter<DocuImage> imageJobCenter = null;
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38
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39 /**
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40 * @param dlConfig
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41 * @param outputfile
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42 * @param job_info
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43 */
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44 public PDFStreamWorker(DigilibConfiguration dlConfig, OutputStream outputfile,
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45 PDFRequest job_info,
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46 DigilibJobCenter<DocuImage> imageJobCenter) {
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47 super();
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48 this.dlConfig = dlConfig;
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49 this.outstream = outputfile;
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50 this.job_info = job_info;
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51 this.imageJobCenter = imageJobCenter;
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52 }
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53
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54 public OutputStream call() throws Exception {
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55 outstream = renderPDF();
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56 return outstream;
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57 }
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58
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59 /**
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60 * @throws DocumentException
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61 * @throws InterruptedException
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62 * @throws ExecutionException
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63 * @throws IOException
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64 */
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65 protected OutputStream renderPDF() throws DocumentException, InterruptedException,
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66 ExecutionException, IOException {
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67 // create document object
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68 doc = new Document(PageSize.A4, 0, 0, 0, 0);
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69 PdfWriter docwriter = null;
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70
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71 long start_time = System.currentTimeMillis();
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72
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73 docwriter = PdfWriter.getInstance(doc, outstream);
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74
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75 setPDFProperties(doc);
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76
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77 doc.open();
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78
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79 addTitlePage(doc);
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80
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81 logger.debug("- " + outstream + " doc.open()ed ("
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82 + (System.currentTimeMillis() - start_time) + "ms)");
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83 start_time = System.currentTimeMillis();
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84
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85 NumRange pgs = job_info.getPages();
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86
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87 for (int p : pgs) {
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88 logger.debug(" - adding Image " + p + " to " + outstream);
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89 // create ImageJobInformation
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90 ImageJobDescription iji = ImageJobDescription.getInstance(job_info, job_info.getDlConfig());
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91 iji.setValue("pn", p);
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92 addImage(doc, iji);
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93 logger.debug(" - done adding Image " + p + " to " + outstream);
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94 }
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95
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96 logger.debug(" - done adding all Images to " + outstream);
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97
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98 doc.close();
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99 logger.debug("- " + outstream + " doc.close() ("
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100 + (System.currentTimeMillis() - start_time) + "ms)");
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101 docwriter.close();
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102 return outstream;
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103 }
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104
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105 /**
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106 * Set PDF-Meta-Attributes.
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107 */
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108 public Document setPDFProperties(Document doc) {
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109 // TODO get proper Information from dlConfig
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110 doc.addAuthor(this.getClass().getName());
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111 doc.addCreationDate();
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112 doc.addKeywords("digilib");
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113 doc.addTitle("digilib PDF");
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114 doc.addCreator(this.getClass().getName());
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115 return doc;
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116 }
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117
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118 /**
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119 * Create a title page and append it to the document (should, of course, be
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120 * called first)
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121 *
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122 * @throws DocumentException
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123 */
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124 public Document addTitlePage(Document doc) throws DocumentException {
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125 PDFTitlePage titlepage = new PDFTitlePage(job_info);
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126 doc.add(titlepage.getPageContents());
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127 doc.newPage();
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128 return doc;
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129 }
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130
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131 /**
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132 * adds an image to the document.
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133 *
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134 * @param doc
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135 * @param iji
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136 * @return
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137 * @throws InterruptedException
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138 * @throws ExecutionException
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139 * @throws IOException
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140 * @throws DocumentException
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141 */
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142 public Document addImage(Document doc, ImageJobDescription iji)
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143 throws InterruptedException, ExecutionException, IOException,
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144 DocumentException {
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145 // create image worker
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548
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146 ImageWorker job = new ImageWorker(dlConfig, iji);
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546
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147 // submit
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548
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148 Future<DocuImage> jobTicket = imageJobCenter.submit(job);
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546
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149 // wait for result
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150 DocuImage img = jobTicket.get();
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151 // scale the image
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152 Image pdfimg = Image.getInstance(img.getAwtImage(), null);
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153 float docW = PageSize.A4.getWidth() - 2 * PageSize.A4.getBorder();
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154 float docH = PageSize.A4.getHeight() - 2 * PageSize.A4.getBorder();
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548
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155 // TODO: do we really scale this again?
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546
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156 pdfimg.scaleToFit(docW, docH);
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157 // add to PDF
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158 doc.add(pdfimg);
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159 return doc;
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160 }
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161
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162 }
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