annotate flys-artifacts/src/main/java/de/intevation/flys/exports/WstWriter.java @ 629:65e4e42b4b03

Removed needless imports. flys-artifacts/trunk@1994 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 24 May 2011 12:40:06 +0000
parents 5606ba4139e0
children 72bcbc308501
rev   line source
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c0bec245f608 Implemented writer that creates WSTs and enabled the WaterlevelExporter to create those.
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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.ArrayList;
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9 import java.util.Collection;
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10 import java.util.HashMap;
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11 import java.util.List;
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12 import java.util.Locale;
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13 import java.util.Map;
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14 import java.util.TreeMap;
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15
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16 import org.apache.log4j.Logger;
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17
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18 import de.intevation.flys.artifacts.model.WstLine;
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19
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20
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21 /**
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22 * A writer that creates WSTs.
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23 *
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24 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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25 */
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26 public class WstWriter {
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27
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28 /** The logger used in this class.*/
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29 private static Logger logger = Logger.getLogger(WstWriter.class);
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30
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31
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32 /** The default unit that is written into the header of the WST.*/
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33 public static final String DEFAULT_UNIT = "Wassserstand [NN + m]";
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34
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35
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36 /** The lines that need to be included for the export.*/
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37 protected Map<Double, WstLine> lines;
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38
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39 /** The column names.*/
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40 protected List<String> columnNames;
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41
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42 /** The locale used to format the values.*/
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43 protected Locale locale;
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44
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45 /** The number of discharge columns.*/
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46 protected int cols;
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47
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48 /** The last Q values.*/
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49 protected double[] qs;
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50
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51
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52
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53 /**
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54 * This constructor creates a new WstWriter with an OutputStream and a
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55 * number of Q columns.
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56 *
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57 * @param out The output stream where the WST is written to.
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58 * @param cols The number of columns of the resulting WST.
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59 */
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60 public WstWriter(int cols) {
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61 this.columnNames = new ArrayList<String>(cols);
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62 this.lines = new HashMap<Double, WstLine>();
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63 this.qs = new double[cols];
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64 this.locale = Locale.US;
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65 this.cols = cols;
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66
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67 }
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68
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69
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70 /**
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71 * This method is used to create the WST from the data that has been
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72 * inserted using add(double[]) before.
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73 */
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74 public void write(OutputStream out) {
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75 logger.info("WstWriter.write");
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76
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77 PrintWriter writer = new PrintWriter(
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78 new BufferedWriter(
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79 new OutputStreamWriter(out)));
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80
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81 writeHeader(writer);
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82
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83 Collection<WstLine> collection = new TreeMap(lines).values();
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84
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85 for (WstLine line: collection) {
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86 writeWLine(writer, line);
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87 }
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88
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89 writer.flush();
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90 writer.close();
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91 }
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93
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94 /**
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95 * This method is used to add a new line to the WST.
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96 *
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97 * @param wqkms A 3dim double array with [W,Q, KM].
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98 */
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99 public void add(double[] wqkms) {
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100 Double km = wqkms[2];
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101
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102 WstLine line = lines.get(km);
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103
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104 if (line == null) {
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105 line = new WstLine(km.doubleValue());
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106 lines.put(km, line);
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107 }
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108
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109 line.add(wqkms[0], wqkms[1]);
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110 }
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111
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112
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113 /**
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114 * Adds a further column name.
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115 *
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116 * @param name The name of the new column.
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117 */
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118 public void addColumn(String name) {
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119 if (name != null) {
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120 columnNames.add(name);
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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 /**
446
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126 * This method writes the header of the WST.
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127 *
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128 * @param writer The PrintWriter that creates the output.
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129 */
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130 protected void writeHeader(PrintWriter writer) {
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131 logger.debug("WstWriter.writeHeader");
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132
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133 writer.println(cols);
447
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134 writer.print(" ");
446
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135
447
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136 for (String columnName: columnNames) {
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137 writer.printf(locale, "%9s", columnName);
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138 }
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139
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140 writer.println();
446
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141
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142 writer.write("* KM ");
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143 writer.write(DEFAULT_UNIT);
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144 writer.println();
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145 }
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146
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147
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148 /**
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149 * This method writes a line with W values and a certain kilometer.
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150 *
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151 * @param writer The PrintWriter that is used to create the output.
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152 * @param line The WstLine that should be written to the output.
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153 */
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154 protected void writeWLine(PrintWriter writer, WstLine line) {
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155 double km = line.getKm();
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156 double[] qs = line.getQs();
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157 int num = line.getSize();
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158
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159 if (dischargesChanged(qs)) {
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160 writeQLine(writer, qs);
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161 }
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162
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163 writer.printf(locale, "%8.3f", km);
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164
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165 for (int i = 0; i < num; i++) {
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166 writer.printf(locale, "%9.2f", line.getW(i));
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167 }
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168
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169 writer.println();
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170 }
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171
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172
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173 /**
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174 * Writes a discharge line (Q values) into a WST.
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175 *
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176 * @param qs the Q values for the next range.
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177 */
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178 protected void writeQLine(PrintWriter writer, double[] qs) {
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179 writer.write("*\u001f ");
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180
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181 for (int i = 0; i < cols; i++) {
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182 this.qs[i] = qs[i];
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183
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184 writer.printf(locale, "%9.2f", qs[i]);
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185 }
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186
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187 writer.println();
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188 }
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189
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190
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191 /**
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192 * This method determines if a Q has changed from the last line to the
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193 * current one.
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194 *
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195 * @param newQs The Q values of the next line.
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196 *
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197 * @return true, if a Q value have changed, otherwise false.
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198 */
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199 protected boolean dischargesChanged(double[] newQs) {
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200 // XXX maybe there is a way to do this faster
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201 for (int i = 0; i < cols; i++) {
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202 if (Math.abs(newQs[i] - qs[i]) >= 0.001) {
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203 return true;
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204 }
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205 }
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206
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207 return false;
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208 }
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209 }
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210 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

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