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annotate flys-artifacts/src/main/java/de/intevation/flys/exports/ChartInfoGenerator.java @ 653:67c7020f4ed3

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Refactored the chart creation in the ChartInfoGenerators. Now, every chart is created by the XYChartGenerator again. flys-artifacts/trunk@2048 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 03 Jun 2011 07:20:39 +0000
parents bb484489d3df
children 913b52064449
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.Color;
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4 import java.awt.Transparency;
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5 import java.io.IOException;
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6 import java.io.OutputStream;
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7
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8 import org.w3c.dom.Document;
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9
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10 import org.apache.log4j.Logger;
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12 import org.jfree.chart.ChartFactory;
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13 import org.jfree.chart.ChartRenderingInfo;
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14 import org.jfree.chart.JFreeChart;
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15 import org.jfree.chart.plot.PlotOrientation;
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16 import org.jfree.chart.plot.XYPlot;
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17
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18 import de.intevation.artifacts.Artifact;
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19 import de.intevation.artifacts.CallContext;
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20
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21 import de.intevation.artifacts.common.utils.XMLUtils;
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22
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23
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24 /**
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25 * An OutGenerator that generates meta information for charts. A concrete
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26 * ChartInfoGenerator need to instantiate a concrete ChartGenerator and dispatch
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27 * the methods to that instance. The only thing this ChartInfoGenerator needs
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28 * to, is to overrite the generate() method which doesn't write the chart image
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29 * to the OutputStream but a Document that contains some meta information of the
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30 * created chart.
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31 *
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32 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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33 */
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34 public abstract class ChartInfoGenerator implements OutGenerator {
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35
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36 /** The logger used in this generator.*/
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37 private static Logger logger =
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38 Logger.getLogger(ChartInfoGenerator.class);
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39
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40
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41 /** The OutGenerator that creates the charts.*/
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42 protected XYChartGenerator generator;
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43
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44 protected OutputStream out;
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45
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46
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47
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48 public ChartInfoGenerator(XYChartGenerator generator) {
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49 this.generator = generator;
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50 }
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51
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52
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53 /**
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54 * Dispatches the operation to the instantiated generator.
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55 *
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56 * @param request
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57 * @param out
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58 * @param context
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59 */
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60 public void init(Document request, OutputStream out, CallContext context) {
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61 this.out = out;
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62
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63 generator.init(request, out, context);
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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 * Dispatches the operation to the instantiated generator.
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69 *
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70 * @param master
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71 */
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72 public void setMasterArtifact(Artifact master) {
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73 generator.setMasterArtifact(master);
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74 }
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75
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76
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77 /**
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78 * Dispatches the operation to the instantiated generator.
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79 *
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80 * @param artifacts
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81 * @param facet
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82 * @param attr
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83 */
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84 public void doOut(Artifact artifact, String facet, Document attr) {
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85 generator.doOut(artifact, facet, attr);
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86 }
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87
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88
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89 /**
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90 * This method generates the chart using a concrete ChartGenerator but
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91 * doesn't write the chart itself to the OutputStream but a Document that
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92 * contains meta information of the created chart.
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93 */
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94 @Override
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95 public void generate()
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96 throws IOException
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97 {
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98 logger.debug("ChartInfoGenerator.generate");
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99
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100 JFreeChart chart = generator.generateChart();
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101
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102 int[] size = generator.getSize();
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103
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104 ChartRenderingInfo info = new ChartRenderingInfo();
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105
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106 chart.createBufferedImage(size[0], size[1], Transparency.BITMASK, info);
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107
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108 Document doc = InfoGeneratorHelper.createInfoDocument(chart, info);
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109
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110 XMLUtils.toStream(doc, out);
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111 }
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112 }
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113 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org