Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/WaterlevelExporter.java @ 389:69d05357c177

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Added an exporter (OutGenerator) for waterlevels which currently supports CSV exports. flys-artifacts/trunk@1810 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 03 May 2011 16:36:21 +0000
parents
children 5d6988836f01
rev   line source
389
69d05357c177 Added an exporter (OutGenerator) for waterlevels which currently supports CSV exports.
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1 package de.intevation.flys.exports;
69d05357c177 Added an exporter (OutGenerator) for waterlevels which currently supports CSV exports.
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2
69d05357c177 Added an exporter (OutGenerator) for waterlevels which currently supports CSV exports.
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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 import java.util.ArrayList;
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7 import java.util.List;
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8
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9 import org.w3c.dom.Document;
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10
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11 import org.apache.log4j.Logger;
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12
69d05357c177 Added an exporter (OutGenerator) for waterlevels which currently supports CSV exports.
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13 import au.com.bytecode.opencsv.CSVWriter;
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14
69d05357c177 Added an exporter (OutGenerator) for waterlevels which currently supports CSV exports.
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15 import de.intevation.artifacts.Artifact;
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16 import de.intevation.artifacts.CallContext;
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17
69d05357c177 Added an exporter (OutGenerator) for waterlevels which currently supports CSV exports.
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18 import de.intevation.flys.artifacts.WINFOArtifact;
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19 import de.intevation.flys.artifacts.model.WQKms;
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20
69d05357c177 Added an exporter (OutGenerator) for waterlevels which currently supports CSV exports.
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21
69d05357c177 Added an exporter (OutGenerator) for waterlevels which currently supports CSV exports.
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22 /**
69d05357c177 Added an exporter (OutGenerator) for waterlevels which currently supports CSV exports.
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23 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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24 */
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25 public class WaterlevelExporter implements OutGenerator {
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26
69d05357c177 Added an exporter (OutGenerator) for waterlevels which currently supports CSV exports.
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27 /** The logger used in this exporter.*/
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28 private static Logger logger = Logger.getLogger(WaterlevelExporter.class);
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29
69d05357c177 Added an exporter (OutGenerator) for waterlevels which currently supports CSV exports.
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30
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31 public static final String WATERLEVEL_FACET_CSV = "waterlevel_export.csv";
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32
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33 public static final String DEFAULT_CSV_CHARSET = "UTF-8";
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34
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35 public static final char DEFAULT_CSV_SEPARATOR = ',';
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36
69d05357c177 Added an exporter (OutGenerator) for waterlevels which currently supports CSV exports.
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37
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38 /** The document of the incoming out() request.*/
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39 protected Document request;
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40
69d05357c177 Added an exporter (OutGenerator) for waterlevels which currently supports CSV exports.
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41 /** The output stream where the data should be written to.*/
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42 protected OutputStream out;
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43
69d05357c177 Added an exporter (OutGenerator) for waterlevels which currently supports CSV exports.
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44 /** The CallContext object.*/
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45 protected CallContext context;
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46
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47 /** The selected facet.*/
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48 protected String facet;
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49
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50 /** The storage that contains all WQKms objects for the different facets.*/
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51 protected List<WQKms[]> data;
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52
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53
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54 public void init(Document request, OutputStream out, CallContext context) {
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55 logger.debug("WaterlevelExporter.init");
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56
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57 this.request = request;
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58 this.out = out;
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59 this.context = context;
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60 this.data = new ArrayList<WQKms[]>();
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61 }
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62
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63
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64 /**
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65 * This doOut() just collects the data of multiple artifacts. The real data
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66 * generation takes place in the concrete generate() methods.
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67 *
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68 * @param artifact The artifact.
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69 * @param facet The facet to add - NOTE: the facet needs to fit to the first
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70 * facet inserted into this exporter. Otherwise this artifact/facet is
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71 * skipped.
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72 * @param attr The attr document.
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73 */
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74 public void doOut(Artifact artifact, String facet, Document attr) {
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75 logger.debug("WaterlevelExporter.doOut: " + facet);
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76
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77 if (!isFacetValid(facet)) {
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78 logger.warn("Facet '" + facet + "' not valid. No output created!");
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79 return;
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80 }
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81
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82 data.add(getWaterlevelData(artifact));
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83 }
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84
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85
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86 public void generate()
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87 throws IOException
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88 {
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89 if (facet != null && facet.equals(WATERLEVEL_FACET_CSV)) {
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90 generateCSV();
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91 }
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92 else {
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93 throw new IOException("invalid facet for exporter.");
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94 }
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95 }
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96
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97
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98 /**
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99 * Determines if the desired facet is valid for this exporter. If no facet
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100 * is currently set, <i>facet</i> is set.
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101 *
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102 * @param facet The desired facet.
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103 *
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104 * @return true, if <i>facet</i> is valid, otherwise false.
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105 */
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106 protected boolean isFacetValid(String facet) {
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107 logger.debug("WaterlevelExporter.isFacetValid");
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108
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109 if (facet == null || facet.length() == 0) {
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110 return false;
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111 }
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112 else if (this.facet == null || this.facet.length() == 0) {
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113 logger.debug("Set the facet of this export: " + facet);
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114 this.facet = facet;
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115
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116 return true;
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117 }
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118 else {
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119 return this.facet.equals(facet);
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120 }
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121 }
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122
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123
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124 /**
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125 * Returns the waterlevel data computed by the WINFOArtifact.
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126 *
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127 * @param artifact The WINFOArtifact.
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128 *
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129 * @return the computed waterlevel data.
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130 */
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131 protected WQKms[] getWaterlevelData(Artifact artifact) {
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132 WINFOArtifact winfoArtifact = (WINFOArtifact) artifact;
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133 WQKms[] wqkms = winfoArtifact.getWaterlevelData();
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134
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135 logger.debug("Got " + wqkms.length + " WQKms objects.");
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136
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137 return wqkms;
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138 }
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139
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140
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141 protected void generateCSV()
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142 throws IOException
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143 {
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144 logger.info("WaterlevelExporter.generateCSV");
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145
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146 CSVWriter writer = new CSVWriter(
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147 new OutputStreamWriter(
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148 out,
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149 DEFAULT_CSV_CHARSET),
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150 DEFAULT_CSV_SEPARATOR);
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151
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152 for (WQKms[] tmp: data) {
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153 for (WQKms wqkms: tmp) {
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154 wQKms2CSV(writer, wqkms);
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155 }
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156 }
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157
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158 writer.close();
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159 }
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160
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161
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162 protected void wQKms2CSV(CSVWriter writer, WQKms wqkms) {
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163 logger.debug("WaterlevelExporter.wQKms2CSV");
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164
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165 int size = wqkms.size();
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166 double[] result = new double[3];
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167
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168 for (int i = 0; i < size; i ++) {
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169 result = wqkms.get(i, result);
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170
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171 writer.writeNext(new String[] {
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172 Double.toString(result[2]),
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173 Double.toString(result[0]),
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174 Double.toString(result[1])
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175 });
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176 }
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177 }
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178 }
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179 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
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