annotate gnv-artifacts/src/main/java/de/intevation/gnv/chart/DefaultHistogram.java @ 778:9a828e5a2390

Removed trailing whitespace gnv-artifacts/trunk@851 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 29 Mar 2010 07:58:51 +0000
parents 79401c871da4
children b1f5f2a8840f
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1 package de.intevation.gnv.chart;
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3 import java.text.NumberFormat;
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4 import java.text.ParseException;
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5 import java.util.Locale;
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6 import java.util.Map;
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8 import org.apache.log4j.Logger;
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9
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10 import org.jfree.chart.ChartTheme;
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12 import org.jfree.chart.plot.XYPlot;
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14 import org.jfree.data.statistics.HistogramDataset;
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15
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16 /**
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17 * Default implementation of {@link de.intevation.gnv.chart.AbstractHistogram}.
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18 *
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19 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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20 */
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21 public class DefaultHistogram
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22 extends AbstractHistogram
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23 {
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24 /**
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25 * Default bin count.
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26 * TODO find a better default value
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27 */
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28 public static final int DEFAULT_BINS = 15;
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30 /**
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31 * Constant field for limitating the number of bin in a single histogram.
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32 */
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33 public static final int MAXIMAL_BINS = 20;
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34
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35 /**
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36 * Default key to retrieve the number of bins from {@link
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37 * #requestParameter}.
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38 */
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39 public static final String REQUEST_KEY_BIN_COUNT = "bincount";
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41 /**
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42 * Default key to retrieve the width of a single bin from {@link
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43 * #requestParameter}.
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44 */
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45 public static final String REQUEST_KEY_BIN_WIDTH = "binwidth";
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47 /**
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48 * Default key to retrieve the chart width from {@link #requestParameter}.
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49 */
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50 public static final String REQUEST_KEY_CHART_WIDTH = "width";
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52 /**
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53 * Default key to retrieve the <code>Locale</code> object from {@link
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54 * #requestParameter} used for i18n support.
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55 */
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56 public static final String REQUEST_KEY_LOCALE = "locale";
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57
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58 /**
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59 * Default key to retrieve the object from {@link #requestParameter}. It
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60 * defines which value this chart has to be used for bin calculation. You
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61 * can either adjust the number of bins or the width of a single bin.
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62 */
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63 public static final String REQUEST_KEY_BIN_CHOICE = "bintype";
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64
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65 /**
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66 * Logger used for logging with log4j.
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67 */
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68 private static Logger logger = Logger.getLogger(DefaultHistogram.class);
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69
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70 /**
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71 * Object storing some further parameter used for chart settings.
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72 */
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73 protected Map requestParameter;
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74
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75
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76 /**
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77 * Constructor to create DefaultHistogram objects.
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78 *
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79 * @param labels Labels to decorate this chart.
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80 * @param data Raw data to be displayed in histogram.
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81 * @param theme Theme used to adjust the chart look.
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82 * @param requestParameter Object which serves some further settings.
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83 */
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84 public DefaultHistogram(
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85 ChartLabels labels, Object[] data, ChartTheme theme, Map requestParameter
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86 ) {
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87 super(labels, data, theme);
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88 this.requestParameter = requestParameter;
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89 }
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91
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92 /**
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93 * @see de.intevation.gnv.chart.AbstractHistogram#applyDatasets()
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94 */
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95 @Override
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96 protected void applyDatasets() {
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97 XYPlot plot = (XYPlot) chart.getPlot();
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98
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99 // prepare data and create add them to histogram dataset
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100 String name = (String) data[0];
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101 double[] values = toDouble((Double[]) data[1]);
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102 int bins = getBinCount(values);
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103
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104 HistogramDataset dataset = new HistogramDataset();
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105 dataset.addSeries(name, values, bins);
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106
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107 plot.setDataset(0, dataset);
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108 }
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110
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111 /**
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112 * Method which scans the hole bunch of values and returns an array with
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113 * contains min and max value. Min value is stored at position 0, max value
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114 * is stored at position 1 in that array.
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115 *
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116 * @param values Array which contains all values
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117 *
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118 * @return Array which contains min and max value
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119 */
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120 protected double[] getMinMax(double[] values) {
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121 double[] minmax = new double[2];
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122 minmax[0] = Double.MAX_VALUE;
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123 minmax[1] = Double.MIN_VALUE;
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124
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125 int length = values.length;
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126 for (int i = 0; i < length; i++) {
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127 minmax[0] = values[i] < minmax[0] ? values[i] : minmax[0];
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128 minmax[1] = values[i] > minmax[1] ? values[i] : minmax[1];
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129 }
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130
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131 return minmax;
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132 }
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133
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134
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135 /**
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136 * Turn a Double[] into a double[].
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137 *
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138 * @param array Doube[]
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139 *
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140 * @return double[]
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141 */
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142 protected double[] toDouble(Double[] array) {
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143 int length = array.length;
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144 double[] values = new double[length];
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145
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146 for(int i = 0; i < length; i++) {
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147 values[i] = array[i].doubleValue();
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148 }
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149
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150 return values;
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151 }
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152
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153
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154 /**
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155 * Method to calculate the number of bins this chart should be parted into.
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156 * The real calculation takes place in {@link #getBinCountByNumber} and
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157 * {@link #getBinCountByWidth}. This method switches between these methods
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158 * depending on the object stored in {@link #requestParameter}.
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159 *
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160 * @param values All values used in this histogram
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161 *
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162 * @return Number of bins
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163 */
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164 protected int getBinCount(double[] values) {
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165 String param = (String) requestParameter.get(REQUEST_KEY_BIN_CHOICE);
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166
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167 if (param != null && param.equalsIgnoreCase(REQUEST_KEY_BIN_WIDTH)) {
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168 return getBinCountByWidth(values);
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169 }
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170 else {
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171 return getBinCountByNumber();
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172 }
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173 }
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174
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175
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176 /**
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177 * Method to retrieve the number of bins. If {@link #requestParameter}
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178 * contains a valid <code>Integer</code> at
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179 * <code>REQUEST_KEY_BIN_COUNT</code> and this is smaller than or equal
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180 * {@link #MAXIMAL_BINS}, this value is used. If no valid
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181 * <code>Integer</code> is given or if the value in {@link #requestParameter}
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182 * is bigger than {@link #MAXIMAL_BINS}, {@link #DEFAULT_BINS} is used.
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183 *
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184 * @return Number of bins
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185 */
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186 protected int getBinCountByNumber() {
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187 int bins = -1;
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188 String param = (String) requestParameter.get(REQUEST_KEY_BIN_COUNT);
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189
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190 try {
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191 bins = Integer.parseInt(param);
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192 bins = bins <= 0 ? DEFAULT_BINS : bins;
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193 bins = bins > MAXIMAL_BINS ? MAXIMAL_BINS : bins;
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194
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195 return bins;
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196 }
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197 catch (NumberFormatException nfe) {
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198 logger.warn("Invalid number of bins for histogram chart: " + param);
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199 logger.warn("Return default bins: " + DEFAULT_BINS);
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200
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201 return DEFAULT_BINS;
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202 }
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203 }
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204
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205
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206 /**
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207 * Serves the number of bins depending on a given width for each bin, but
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208 * maximum bin count is limited by {@link MAXIMAL_BINS}.
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209 *
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210 * @param values All values in this histogram
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211 *
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212 * @return Number of bins
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213 */
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214 protected int getBinCountByWidth(double[] values) {
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215 int bins = -1;
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216 String param = (String) requestParameter.get(REQUEST_KEY_BIN_WIDTH);
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217 Locale locale = (Locale) requestParameter.get(REQUEST_KEY_LOCALE);
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218 NumberFormat format = NumberFormat.getInstance(locale);
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219
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220 try {
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221 double[] minmax = getMinMax(values);
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222 double totalWidth = minmax[1] - minmax[0];
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223 Number number = format.parse(param);
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224 double binWidth = -1d;
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225
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226 if (number instanceof Double) {
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227 binWidth = ((Double) number).doubleValue();
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228 }
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229 else if (number instanceof Long) {
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230 binWidth = ((Long) number).doubleValue();
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231 }
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232 else if (number instanceof Integer) {
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233 binWidth = ((Integer) number).doubleValue();
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234 }
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235 else {
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236 logger.warn("Invalid bin width for histogram chart: " + param);
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237 logger.warn("Return default bins: " + DEFAULT_BINS);
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238
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239 return DEFAULT_BINS;
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240 }
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241
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242 double tmpBins = totalWidth / binWidth;
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243
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244 bins = (int) Math.round(tmpBins);
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245 bins = bins <= 0 ? DEFAULT_BINS : bins;
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246 bins = bins > MAXIMAL_BINS ? MAXIMAL_BINS : bins;
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247
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248 return bins;
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parents: 623
diff changeset
249 }
d08b9ba148c5 Implemented logic to adjust number of bins corresponding to user input.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 623
diff changeset
250 catch (ParseException pe) {
d08b9ba148c5 Implemented logic to adjust number of bins corresponding to user input.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 623
diff changeset
251 logger.warn("Invalid bin width for histogram chart: " + param);
d08b9ba148c5 Implemented logic to adjust number of bins corresponding to user input.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 623
diff changeset
252 logger.warn("Return default bins: " + DEFAULT_BINS);
d08b9ba148c5 Implemented logic to adjust number of bins corresponding to user input.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 623
diff changeset
253
d08b9ba148c5 Implemented logic to adjust number of bins corresponding to user input.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 623
diff changeset
254 return DEFAULT_BINS;
d08b9ba148c5 Implemented logic to adjust number of bins corresponding to user input.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 623
diff changeset
255 }
d08b9ba148c5 Implemented logic to adjust number of bins corresponding to user input.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 623
diff changeset
256 catch (NumberFormatException nfe) {
d08b9ba148c5 Implemented logic to adjust number of bins corresponding to user input.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 623
diff changeset
257 logger.warn("Invalid bin width for histogram chart: " + param);
d08b9ba148c5 Implemented logic to adjust number of bins corresponding to user input.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 623
diff changeset
258 logger.warn("Return default bins: " + DEFAULT_BINS);
d08b9ba148c5 Implemented logic to adjust number of bins corresponding to user input.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 623
diff changeset
259
d08b9ba148c5 Implemented logic to adjust number of bins corresponding to user input.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 623
diff changeset
260 return DEFAULT_BINS;
d08b9ba148c5 Implemented logic to adjust number of bins corresponding to user input.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 623
diff changeset
261 }
d08b9ba148c5 Implemented logic to adjust number of bins corresponding to user input.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 623
diff changeset
262 }
617
3d13fa281a7e Added new ouput mode: histogram.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
263 }
3d13fa281a7e Added new ouput mode: histogram.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
264 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :

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