Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/ChartInfoGenerator.java @ 655:913b52064449

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Refactored version of "Berechnung 4" flys-artifacts/trunk@2053 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sun, 05 Jun 2011 18:24:46 +0000
parents 67c7020f4ed3
children b22f21b173a7
rev   line source
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bb484489d3df Introduced a new output generators for creating chart info documents.
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1 package de.intevation.flys.exports;
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2
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3 import java.awt.Transparency;
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4 import java.io.IOException;
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5 import java.io.OutputStream;
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6
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7 import org.w3c.dom.Document;
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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 org.jfree.chart.ChartRenderingInfo;
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12 import org.jfree.chart.JFreeChart;
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13
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14 import de.intevation.artifacts.Artifact;
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15 import de.intevation.artifacts.CallContext;
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16
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17 import de.intevation.artifacts.common.utils.XMLUtils;
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18
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19
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20 /**
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21 * An OutGenerator that generates meta information for charts. A concrete
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22 * ChartInfoGenerator need to instantiate a concrete ChartGenerator and dispatch
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23 * the methods to that instance. The only thing this ChartInfoGenerator needs
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24 * to, is to overrite the generate() method which doesn't write the chart image
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25 * to the OutputStream but a Document that contains some meta information of the
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26 * created chart.
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27 *
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28 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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29 */
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30 public abstract class ChartInfoGenerator implements OutGenerator {
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31
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32 /** The logger used in this generator.*/
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33 private static Logger logger =
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34 Logger.getLogger(ChartInfoGenerator.class);
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35
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36
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37 /** The OutGenerator that creates the charts.*/
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38 protected XYChartGenerator generator;
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39
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40 protected OutputStream out;
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41
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42
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43
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44 public ChartInfoGenerator(XYChartGenerator generator) {
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45 this.generator = generator;
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46 }
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47
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48
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49 /**
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50 * Dispatches the operation to the instantiated generator.
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51 *
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52 * @param request
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53 * @param out
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54 * @param context
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55 */
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56 public void init(Document request, OutputStream out, CallContext context) {
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57 this.out = out;
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58
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59 generator.init(request, out, context);
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60 }
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61
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62
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63 /**
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64 * Dispatches the operation to the instantiated generator.
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65 *
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66 * @param master
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67 */
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68 public void setMasterArtifact(Artifact master) {
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69 generator.setMasterArtifact(master);
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70 }
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71
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72
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73 /**
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74 * Dispatches the operation to the instantiated generator.
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75 *
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76 * @param artifacts
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77 * @param facet
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78 * @param attr
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79 */
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80 public void doOut(Artifact artifact, String facet, Document attr) {
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81 generator.doOut(artifact, facet, attr);
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82 }
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83
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84
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85 /**
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86 * This method generates the chart using a concrete ChartGenerator but
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87 * doesn't write the chart itself to the OutputStream but a Document that
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88 * contains meta information of the created chart.
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89 */
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90 @Override
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91 public void generate()
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92 throws IOException
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93 {
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94 logger.debug("ChartInfoGenerator.generate");
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95
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96 JFreeChart chart = generator.generateChart();
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97
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98 int[] size = generator.getSize();
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99
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100 ChartRenderingInfo info = new ChartRenderingInfo();
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101
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102 chart.createBufferedImage(size[0], size[1], Transparency.BITMASK, info);
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103
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104 Document doc = InfoGeneratorHelper.createInfoDocument(chart, info);
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105
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106 XMLUtils.toStream(doc, out);
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107 }
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108 }
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109 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org