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annotate flys-artifacts/src/main/java/de/intevation/flys/exports/WstWriter.java @ 446:c0bec245f608

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Implemented writer that creates WSTs and enabled the WaterlevelExporter to create those. flys-artifacts/trunk@1938 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 17 May 2011 16:31:07 +0000
parents
children 5606ba4139e0
rev   line source
446
c0bec245f608 Implemented writer that creates WSTs and enabled the WaterlevelExporter to create those.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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1 package de.intevation.flys.exports;
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2
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3 import java.io.BufferedWriter;
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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.io.PrintWriter;
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7
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8 import java.util.Collection;
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9 import java.util.HashMap;
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10 import java.util.Locale;
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11 import java.util.Map;
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12 import java.util.TreeMap;
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13
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14 import org.apache.log4j.Logger;
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15
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16 import de.intevation.flys.artifacts.model.WstLine;
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17
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18
c0bec245f608 Implemented writer that creates WSTs and enabled the WaterlevelExporter to create those.
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19 /**
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20 * A writer that creates WSTs.
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21 *
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22 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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23 */
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24 public class WstWriter {
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25
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26 /** The logger used in this class.*/
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27 private static Logger logger = Logger.getLogger(WstWriter.class);
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28
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29
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30 /** The default unit that is written into the header of the WST.*/
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31 public static final String DEFAULT_UNIT = "Wassserstand [NN + m]";
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32
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33
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34 /** The lines that need to be included for the export.*/
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35 protected Map<Double, WstLine> lines;
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36
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37 /** The locale used to format the values.*/
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38 protected Locale locale;
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39
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40 /** The number of discharge columns.*/
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41 protected int cols;
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42
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43 /** The last Q values.*/
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44 protected double[] qs;
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45
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47
c0bec245f608 Implemented writer that creates WSTs and enabled the WaterlevelExporter to create those.
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48 /**
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49 * This constructor creates a new WstWriter with an OutputStream and a
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50 * number of Q columns.
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51 *
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52 * @param out The output stream where the WST is written to.
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53 * @param cols The number of columns of the resulting WST.
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54 */
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55 public WstWriter(int cols) {
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56 this.cols = cols;
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57 this.qs = new double[cols];
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58 this.locale = Locale.US;
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59 this.lines = new HashMap<Double, WstLine>();
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60
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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 method is used to create the WST from the data that has been
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66 * inserted using add(double[]) before.
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67 */
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68 public void write(OutputStream out) {
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69 logger.info("WstWriter.write");
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70
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71 PrintWriter writer = new PrintWriter(
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72 new BufferedWriter(
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73 new OutputStreamWriter(out)));
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74
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75 writeHeader(writer);
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76
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77 Collection<WstLine> collection = new TreeMap(lines).values();
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78
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79 for (WstLine line: collection) {
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80 writeWLine(writer, line);
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81 }
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82
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83 writer.flush();
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84 writer.close();
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85 }
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86
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87
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88 /**
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89 * This method is used to add a new line to the WST.
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90 *
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91 * @param wqkms A 3dim double array with [W,Q, KM].
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92 */
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93 public void add(double[] wqkms) {
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94 Double km = wqkms[2];
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95
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96 WstLine line = lines.get(km);
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97
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98 if (line == null) {
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99 line = new WstLine(km.doubleValue());
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100 lines.put(km, line);
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101 }
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102
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103 line.add(wqkms[0], wqkms[1]);
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104 }
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105
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106
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107 /**
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108 * This method writes the header of the WST.
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109 *
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110 * @param writer The PrintWriter that creates the output.
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111 */
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112 protected void writeHeader(PrintWriter writer) {
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113 logger.debug("WstWriter.writeHeader");
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114
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115 writer.println(cols);
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116
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117 // TODO WRITE DISCHARGE COLUMNS
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118
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119 writer.write("* KM ");
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120 writer.write(DEFAULT_UNIT);
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121 writer.println();
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122 }
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123
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124
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125 /**
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126 * This method writes a line with W values and a certain kilometer.
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127 *
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128 * @param writer The PrintWriter that is used to create the output.
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129 * @param line The WstLine that should be written to the output.
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130 */
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131 protected void writeWLine(PrintWriter writer, WstLine line) {
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132 double km = line.getKm();
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133 double[] qs = line.getQs();
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134 int num = line.getSize();
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135
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136 if (dischargesChanged(qs)) {
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137 writeQLine(writer, qs);
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138 }
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139
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140 writer.printf(locale, "%8.3f", km);
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141
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142 for (int i = 0; i < num; i++) {
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143 writer.printf(locale, "%9.2f", line.getW(i));
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144 }
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145
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146 writer.println();
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147 }
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148
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149
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150 /**
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151 * Writes a discharge line (Q values) into a WST.
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152 *
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153 * @param qs the Q values for the next range.
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154 */
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155 protected void writeQLine(PrintWriter writer, double[] qs) {
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156 writer.write("*\u001f ");
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157
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158 for (int i = 0; i < cols; i++) {
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159 this.qs[i] = qs[i];
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160
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161 writer.printf(locale, "%9.2f", qs[i]);
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162 }
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163
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164 writer.println();
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165 }
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166
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167
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168 /**
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169 * This method determines if a Q has changed from the last line to the
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170 * current one.
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171 *
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172 * @param newQs The Q values of the next line.
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173 *
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174 * @return true, if a Q value have changed, otherwise false.
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175 */
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176 protected boolean dischargesChanged(double[] newQs) {
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177 // XXX maybe there is a way to do this faster
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178 for (int i = 0; i < cols; i++) {
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179 if (Math.abs(newQs[i] - qs[i]) >= 0.001) {
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180 return true;
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181 }
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182 }
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183
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184 return false;
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185 }
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186 }
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187 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org