annotate software/eXist/mpdl-modules/src/de/mpg/mpiwg/berlin/mpdl/util/MpdlITextUserAgent.java @ 0:408254cf2f1d

Erstellung
author Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
date Wed, 24 Nov 2010 17:24:23 +0100
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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1 package de.mpg.mpiwg.berlin.mpdl.util;
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2
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3 import java.io.IOException;
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4 import java.io.InputStream;
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5 import java.net.URL;
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6
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7 import org.apache.log4j.Logger;
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8 import org.xhtmlrenderer.layout.SharedContext;
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9 import org.xhtmlrenderer.pdf.ITextFSImage;
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10 import org.xhtmlrenderer.pdf.ITextOutputDevice;
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11 import org.xhtmlrenderer.pdf.PDFAsImage;
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12 import org.xhtmlrenderer.resource.ImageResource;
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13 import org.xhtmlrenderer.swing.NaiveUserAgent;
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14
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15 import com.lowagie.text.Image;
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16 import com.lowagie.text.Rectangle;
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17 import com.lowagie.text.pdf.PdfReader;
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18
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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19 public class MpdlITextUserAgent extends NaiveUserAgent {
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20 private static final int IMAGE_CACHE_CAPACITY = 32;
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21 private static final float DEFAULT_DOTS_PER_POINT = 20f * 4f / 3f;
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22 private static Logger LOGGER = Logger.getLogger(MpdlITextUserAgent.class); // Logs to EXIST_HOME/webapp/WEB-INF/logs/exist.log
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23 private SharedContext sharedContext;
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24 private ITextOutputDevice outputDevice;
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25
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26 public MpdlITextUserAgent() {
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27 super(IMAGE_CACHE_CAPACITY);
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28 outputDevice = new ITextOutputDevice(DEFAULT_DOTS_PER_POINT);
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29 }
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30
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31 @SuppressWarnings("unchecked")
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32 public ImageResource getImageResource(String inputUri) {
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33 ImageResource resource = null;
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34 String uri = resolveURI(inputUri);
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35 resource = (ImageResource) _imageCache.get(uri);
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36 if (resource == null) {
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37 InputStream is = resolveAndOpenStream(uri);
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38 if (is != null) {
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39 try {
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40 URL url = new URL(uri);
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41 if (url.getPath() != null && url.getPath().toLowerCase().endsWith(".pdf")) {
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42 PdfReader reader = outputDevice.getReader(url);
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43 PDFAsImage image = new PDFAsImage(url);
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44 Rectangle rect = reader.getPageSizeWithRotation(1);
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45 image.setInitialWidth(rect.getWidth()*outputDevice.getDotsPerPoint());
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46 image.setInitialHeight(rect.getHeight()*outputDevice.getDotsPerPoint());
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47 resource = new ImageResource(image);
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48 } else {
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49 Image image = getImage(url);
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50 if (image == null)
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51 return null;
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52 scaleToOutputResolution(image);
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53 resource = new ImageResource(new ITextFSImage(image));
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54 }
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55 _imageCache.put(uri, resource);
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56 } catch (IOException e) {
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57 LOGGER.error("Can't get image file: unexpected problem for URI: '" + uri + "': " + e.getMessage(), e);
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58 } finally {
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59 try {
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60 if (is != null)
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61 is.close();
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62 } catch (IOException e) {
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63 // ignore
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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 if (resource == null) {
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69 resource = new ImageResource(null);
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70 }
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71 return resource;
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72 }
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73
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74 private void scaleToOutputResolution(Image image) {
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75 float factor = sharedContext.getDotsPerPixel();
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76 image.scaleAbsolute(image.getPlainWidth() * factor, image.getPlainHeight() * factor);
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77 }
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78
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79 public SharedContext getSharedContext() {
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80 return sharedContext;
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81 }
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82
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83 public void setSharedContext(SharedContext sharedContext) {
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84 this.sharedContext = sharedContext;
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85 }
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86
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87 private Image getImage(URL url) {
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88 Image image = null;
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89 try {
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90 image = Image.getInstance(url);
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91 } catch (Exception e) {
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92 try {
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93 Thread.sleep(1000);
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94 } catch (InterruptedException ee) {
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95 // nothing
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96 }
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97 LOGGER.error("first retry to get image for URL '" + url.toString() + "': " + e.getMessage(), e);
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98 try {
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99 image = Image.getInstance(url);
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100 } catch (Exception e2) {
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101 try {
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102 Thread.sleep(1000);
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103 } catch (InterruptedException ee) {
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104 // nothing
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105 }
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106 LOGGER.error("second retry to get image for URL '" + url.toString() + "': " + e.getMessage(), e);
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107 try {
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108 image = Image.getInstance(url);
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109 } catch (Exception e3) {
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110 LOGGER.error("third retry to get image for URL '" + url.toString() + "': " + e.getMessage(), e);
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111 return null;
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112 }
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113 }
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114 }
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115 return image;
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116 }
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117
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118 protected InputStream resolveAndOpenStream(String inputUri) {
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119 InputStream is = null;
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120 String uri = resolveURI(inputUri);
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121 try {
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122 is = new URL(uri).openStream();
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123 } catch (Exception e) {
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124 try {
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125 Thread.sleep(1000);
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126 } catch (InterruptedException ee) {
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127 // nothing
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128 }
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129 LOGGER.error("first retry to open stream for URL '" + uri + "': " + e.getMessage(), e);
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130 try {
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131 is = new URL(uri).openStream();
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132 } catch (Exception e2) {
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133 try {
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134 Thread.sleep(1000);
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135 } catch (InterruptedException ee) {
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136 // nothing
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137 }
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138 LOGGER.error("second retry to open stream for URL '" + uri + "': " + e.getMessage(), e);
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139 try {
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140 is = new URL(uri).openStream();
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141 } catch (Exception e3) {
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parents:
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142 LOGGER.error("third retry to open stream for URL '" + uri + "': " + e.getMessage(), e);
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parents:
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143 return null;
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parents:
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144 }
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parents:
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145 }
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
parents:
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146 }
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parents:
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147 return is;
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parents:
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148 }
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parents:
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149 }