Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/ChartInfoGenerator.java @ 1684:bdb05dc9b763

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Bugfix: #353 Enabled chart's to be drawn with proper axes set even if no data is contained. flys-artifacts/trunk@2902 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 07 Oct 2011 10:51:09 +0000
parents 45cd58a2a2bb
children b7b424ae32a8
rev   line source
647
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.artifactdatabase.state.Facet;
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18
647
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19 import de.intevation.artifacts.common.utils.XMLUtils;
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20
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21
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22 /**
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23 * An OutGenerator that generates meta information for charts. A concrete
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24 * ChartInfoGenerator need to instantiate a concrete ChartGenerator and dispatch
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25 * the methods to that instance. The only thing this ChartInfoGenerator needs
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26 * to, is to overrite the generate() method which doesn't write the chart image
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27 * to the OutputStream but a Document that contains some meta information of the
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28 * created chart.
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29 *
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30 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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31 */
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32 public abstract class ChartInfoGenerator implements OutGenerator {
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33
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34 /** The logger used in this generator.*/
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35 private static Logger logger =
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36 Logger.getLogger(ChartInfoGenerator.class);
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37
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38
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39 /** The OutGenerator that creates the charts.*/
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40 protected XYChartGenerator generator;
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41
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42 protected OutputStream out;
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43
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44
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45
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46 public ChartInfoGenerator(XYChartGenerator generator) {
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47 this.generator = generator;
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48 }
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49
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50
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51 /**
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52 * Dispatches the operation to the instantiated generator.
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53 *
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54 * @param request
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55 * @param out
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56 * @param context
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57 */
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58 public void init(Document request, OutputStream out, CallContext context) {
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59 this.out = out;
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60
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61 generator.init(request, out, context);
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62 }
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63
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64
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65 /**
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66 * Dispatches the operation to the instantiated generator.
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67 *
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68 * @param master
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69 */
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70 public void setMasterArtifact(Artifact master) {
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71 generator.setMasterArtifact(master);
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72 }
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73
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74
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75 /**
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76 * Dispatches the operation to the instantiated generator.
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77 *
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78 * @param artifacts
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79 * @param facet
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80 * @param attr
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81 */
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82 public void doOut(
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83 Artifact artifact,
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84 Facet facet,
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85 Document attr,
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86 boolean visible
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87 ) {
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88 generator.doOut(artifact, facet, attr, visible);
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89 }
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90
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91
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92 /**
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93 * This method generates the chart using a concrete ChartGenerator but
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94 * doesn't write the chart itself to the OutputStream but a Document that
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95 * contains meta information of the created chart.
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96 */
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97 @Override
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98 public void generate()
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99 throws IOException
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100 {
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101 logger.debug("ChartInfoGenerator.generate");
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102
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103 JFreeChart chart = generator.generateChart();
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104
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105 int[] size = generator.getSize();
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106
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107 ChartRenderingInfo info = new ChartRenderingInfo();
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108
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109 chart.createBufferedImage(size[0], size[1], Transparency.BITMASK, info);
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110
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111 InfoGeneratorHelper helper = new InfoGeneratorHelper(generator);
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112 Document doc = helper.createInfoDocument(chart, info);
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113
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114 XMLUtils.toStream(doc, out);
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115 }
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116 }
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117 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org