Mercurial > dive4elements > river
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> |
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date | Thu, 12 May 2011 09:11:16 +0000 |
parents | 046bd86ae41d |
children | 8fa4c5c9cd1a |
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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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5 |
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6 import javax.xml.xpath.XPathConstants; |
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7 |
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8 import org.apache.log4j.Logger; |
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9 |
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10 import org.w3c.dom.Document; |
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11 import org.w3c.dom.Node; |
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12 |
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13 import de.intevation.artifacts.Artifact; |
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14 import de.intevation.artifacts.CallContext; |
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15 |
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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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23 |
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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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34 |
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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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46 |
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47 |
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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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56 |
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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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59 |
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60 |
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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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68 |
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69 |
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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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78 |
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79 |
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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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83 |
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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); |
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149 |
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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 : |