Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/exports/AbstractExporter.java @ 391:5d6988836f01
Added an exporter to export the computed data of a duration curve.
flys-artifacts/trunk@1814 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Tue, 03 May 2011 17:37:56 +0000 |
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children | 046bd86ae41d |
rev | line source |
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5d6988836f01
Added an exporter to export the computed data of a duration curve.
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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 import java.io.OutputStreamWriter; |
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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 au.com.bytecode.opencsv.CSVWriter; |
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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 |
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17 /** |
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18 * An abstract exporter that implements some basic methods for exporting data of |
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19 * artifacts. |
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20 * |
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21 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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22 */ |
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23 public abstract class AbstractExporter implements OutGenerator { |
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24 |
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25 /** The logger used in this exporter.*/ |
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26 private static Logger logger = Logger.getLogger(AbstractExporter.class); |
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27 |
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28 |
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29 /** The name of the CSV facet which triggers the CSV creation.*/ |
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30 public static final String FACET_CSV = "csv"; |
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31 |
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32 /** The default charset for the CSV export.*/ |
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33 public static final String DEFAULT_CSV_CHARSET = "UTF-8"; |
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34 |
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35 /** The default separator for the CSV export.*/ |
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36 public static final char DEFAULT_CSV_SEPARATOR = ','; |
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37 |
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38 |
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39 /** The document of the incoming out() request.*/ |
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40 protected Document request; |
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41 |
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42 /** The output stream where the data should be written to.*/ |
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43 protected OutputStream out; |
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44 |
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45 /** The CallContext object.*/ |
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46 protected CallContext context; |
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47 |
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48 /** The selected facet.*/ |
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49 protected String facet; |
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50 |
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51 |
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52 /** |
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53 * Concrete subclasses need to use this method to write their special data |
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54 * objects into the CSV document. |
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55 * |
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56 * @param writer The CSVWriter. |
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57 */ |
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58 protected abstract void writeCSVData(CSVWriter writer); |
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59 |
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60 |
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61 /** |
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62 * This method enables concrete subclasses to collected its own special |
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63 * data. |
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64 * |
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65 * @param artifacts The artifact that stores the data that has to be |
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66 * exported. |
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67 */ |
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68 protected abstract void addData(Artifact artifact); |
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69 |
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70 |
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71 public void init(Document request, OutputStream out, CallContext context) { |
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72 logger.debug("AbstractExporter.init"); |
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73 |
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74 this.request = request; |
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75 this.out = out; |
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76 this.context = context; |
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77 } |
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78 |
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79 |
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80 /** |
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81 * This doOut() just collects the data of multiple artifacts. Therefore, it |
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82 * makes use of the addData() method which enables concrete subclasses to |
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83 * store its data on its own. The real output creation takes place in the |
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84 * concrete generate() methods. |
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85 * |
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86 * @param artifact The artifact. |
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87 * @param facet The facet to add - NOTE: the facet needs to fit to the first |
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88 * facet inserted into this exporter. Otherwise this artifact/facet is |
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89 * skipped. |
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90 * @param attr The attr document. |
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91 */ |
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92 public void doOut(Artifact artifact, String facet, Document attr) { |
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93 logger.debug("AbstractExporter.doOut: " + facet); |
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94 |
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95 if (!isFacetValid(facet)) { |
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96 logger.warn("Facet '" + facet + "' not valid. No output created!"); |
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97 return; |
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98 } |
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99 |
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100 addData(artifact); |
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101 } |
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102 |
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103 |
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104 /** |
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105 * Generates an export based on a specified facet. |
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106 */ |
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107 public void generate() |
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108 throws IOException |
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109 { |
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110 logger.debug("AbstractExporter.generate"); |
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111 |
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112 if (facet != null && facet.equals(FACET_CSV)) { |
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113 generateCSV(); |
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114 } |
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115 else { |
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116 throw new IOException("invalid facet for exporter."); |
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117 } |
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118 } |
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119 |
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120 |
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121 /** |
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122 * Determines if the desired facet is valid for this exporter. If no facet |
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123 * is currently set, <i>facet</i> is set. |
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124 * |
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125 * @param facet The desired facet. |
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126 * |
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127 * @return true, if <i>facet</i> is valid, otherwise false. |
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128 */ |
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129 protected boolean isFacetValid(String facet) { |
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130 logger.debug("AbstractExporter.isFacetValid"); |
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131 |
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132 if (facet == null || facet.length() == 0) { |
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133 return false; |
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134 } |
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135 else if (this.facet == null || this.facet.length() == 0) { |
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136 logger.debug("Set the facet of this export: " + facet); |
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137 this.facet = facet; |
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138 |
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139 return true; |
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140 } |
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141 else { |
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142 return this.facet.equals(facet); |
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143 } |
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144 } |
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145 |
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146 |
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147 /** |
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148 * This method starts CSV creation. It makes use of writeCSVData() which has |
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149 * to be implemented by concrete subclasses. |
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150 */ |
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151 protected void generateCSV() |
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152 throws IOException |
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153 { |
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154 logger.info("AbstractExporter.generateCSV"); |
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155 |
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156 CSVWriter writer = new CSVWriter( |
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157 new OutputStreamWriter( |
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158 out, |
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159 DEFAULT_CSV_CHARSET), |
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160 DEFAULT_CSV_SEPARATOR); |
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161 |
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162 writeCSVData(writer); |
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163 |
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164 writer.close(); |
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165 } |
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166 } |
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167 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |