Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/AbstractExporter.java @ 391:5d6988836f01

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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>
date Tue, 03 May 2011 17:37:56 +0000
parents
children 046bd86ae41d
rev   line source
391
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 :
http://dive4elements.wald.intevation.org