annotate flys-artifacts/src/main/java/de/intevation/flys/exports/ChartGenerator.java @ 423:bab867fb37e8

Charts are generated using the size defined in the incoming request document. flys-artifacts/trunk@1908 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 12 May 2011 09:11:16 +0000
parents 046bd86ae41d
children 8fa4c5c9cd1a
rev   line source
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1 package de.intevation.flys.exports;
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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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6 import javax.xml.xpath.XPathConstants;
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8 import org.apache.log4j.Logger;
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10 import org.w3c.dom.Document;
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11 import org.w3c.dom.Node;
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13 import de.intevation.artifacts.Artifact;
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14 import de.intevation.artifacts.CallContext;
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16 import de.intevation.artifacts.ArtifactNamespaceContext;
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17 import de.intevation.artifacts.common.utils.XMLUtils;
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18
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19 import de.intevation.flys.model.River;
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20
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21 import de.intevation.flys.artifacts.FLYSArtifact;
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22 import de.intevation.flys.artifacts.resources.Resources;
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24
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25 /**
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26 * The base class for chart creation. It should provide some basic things that
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27 * equal in all chart types.
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28 *
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29 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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30 */
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31 public abstract class ChartGenerator implements OutGenerator {
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32
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33 private static Logger logger = Logger.getLogger(ChartGenerator.class);
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35
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36 /** The default chart width, if no other width is set.*/
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37 public static final int DEFAULT_CHART_WIDTH = 600;
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38
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39 /** The default chart height, if no other height is set.*/
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40 public static final int DEFAULT_CHART_HEIGHT = 400;
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41
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42 /** The XPath that points to the chart size of the incoming request
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43 * document.*/
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44 public static final String XPATH_CHART_SIZE =
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45 "/art:action/art:attributes/art:size";
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48 /** The document of the incoming out() request.*/
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49 protected Document request;
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50
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51 /** The output stream where the data should be written to.*/
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52 protected OutputStream out;
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53
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54 /** The CallContext object.*/
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55 protected CallContext context;
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57 /** The artifact that is used to decorate the chart with meta information.*/
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58 protected Artifact master;
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61 public void init(Document request, OutputStream out, CallContext context) {
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62 logger.debug("ChartGenerator.init");
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63
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64 this.request = request;
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65 this.out = out;
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66 this.context = context;
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67 }
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70 public void setMasterArtifact(Artifact master) {
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71 this.master = master;
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72 }
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73
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74
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75 protected String msg(String key, String def) {
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76 return Resources.getMsg(context.getMeta(), key, def);
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77 }
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80 protected String msg(String key, String def, Object[] args) {
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81 return Resources.getMsg(context.getMeta(), key, def, args);
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82 }
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84
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85 protected String getRiverName() {
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86 FLYSArtifact flys = (FLYSArtifact) master;
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87
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88 River river = flys.getRiver();
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89 return river != null ? river.getName() : "";
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90 }
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91
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92
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93 protected double[] getRange() {
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94 FLYSArtifact flys = (FLYSArtifact) master;
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95
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96 return flys.getDistance();
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97 }
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98
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99
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100 /**
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101 * Returns the size of a chart export as array which has been specified by
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102 * the incoming request document.
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103 *
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104 * @return the size of a chart as [width, height] or the result of
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105 * getDefaultSize() if no width or height are given in the request document.
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106 */
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107 protected int[] getSize() {
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108 int[] size = new int[2];
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109
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110 Node sizeEl = (Node) XMLUtils.xpath(
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111 request,
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112 XPATH_CHART_SIZE,
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113 XPathConstants.NODE,
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114 ArtifactNamespaceContext.INSTANCE);
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115
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116 if (sizeEl != null) {
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117 String w = XMLUtils.xpathString(
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118 sizeEl, "@art:width", ArtifactNamespaceContext.INSTANCE);
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119
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120 String h = XMLUtils.xpathString(
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121 sizeEl, "@art:height", ArtifactNamespaceContext.INSTANCE);
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122
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123 if (w != null && w.length() > 0 && h != null && h.length() > 0) {
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124 try {
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125 size[0] = Integer.parseInt(w);
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126 size[1] = Integer.parseInt(h);
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127 }
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128 catch (NumberFormatException nfe) {
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129 logger.warn("Wrong values for chart width/height.");
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130 }
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131 }
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132 }
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133
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134 return size[0] > 0 && size[1] > 0 ? size : getDefaultSize();
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135 }
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136
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137
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138 /**
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139 * Returns the default size of a chart export as array.
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140 *
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141 * @return the default size of a chart as [width, height].
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142 */
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143 protected int[] getDefaultSize() {
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144 return new int[] { DEFAULT_CHART_WIDTH, DEFAULT_CHART_HEIGHT };
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145 }
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146
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147
364
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148 public abstract void doOut(Artifact artifact, String facet, Document attr);
348
635af5381a4d Added an abstract OutGenerator that should be the base class for all generators which create charts.
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149
635af5381a4d Added an abstract OutGenerator that should be the base class for all generators which create charts.
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150 public abstract void generate() throws IOException;
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151 }
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152 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

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