annotate gnv-artifacts/src/main/java/de/intevation/gnv/chart/DefaultHistogram.java @ 803:feae2f9d6c6f

Removed trailing whitespace. gnv-artifacts/trunk@885 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 07 Apr 2010 07:52:27 +0000
parents b1f5f2a8840f
children 22c18083225e
rev   line source
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1 package de.intevation.gnv.chart;
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2
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3 import java.text.NumberFormat;
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4 import java.text.ParseException;
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6 import java.util.Locale;
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7 import java.util.Map;
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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 org.jfree.chart.ChartTheme;
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13 import org.jfree.chart.plot.XYPlot;
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14
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15 import org.jfree.data.statistics.HistogramDataset;
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16
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17 /**
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18 * Default implementation of {@link de.intevation.gnv.chart.AbstractHistogram}.
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19 *
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20 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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21 */
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22 public class DefaultHistogram
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23 extends AbstractHistogram
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24 {
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25 /**
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26 * Default bin count.
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27 * TODO find a better default value
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28 */
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29 public static final int DEFAULT_BINS = 15;
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30
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31 /**
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32 * Constant field for limitating the number of bin in a single histogram.
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33 */
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34 public static final int MAXIMAL_BINS = 20;
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35
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36 /**
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37 * Default key to retrieve the number of bins from {@link
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38 * #requestParameter}.
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39 */
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40 public static final String REQUEST_KEY_BIN_COUNT = "bincount";
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41
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42 /**
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43 * Default key to retrieve the width of a single bin from {@link
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44 * #requestParameter}.
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45 */
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46 public static final String REQUEST_KEY_BIN_WIDTH = "binwidth";
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48 /**
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49 * Default key to retrieve the chart width from {@link #requestParameter}.
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50 */
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51 public static final String REQUEST_KEY_CHART_WIDTH = "width";
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52
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53 /**
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54 * Default key to retrieve the <code>Locale</code> object from {@link
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55 * #requestParameter} used for i18n support.
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56 */
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57 public static final String REQUEST_KEY_LOCALE = "locale";
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58
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59 /**
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60 * Default key to retrieve the object from {@link #requestParameter}. It
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61 * defines which value this chart has to be used for bin calculation. You
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62 * can either adjust the number of bins or the width of a single bin.
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63 */
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64 public static final String REQUEST_KEY_BIN_CHOICE = "bintype";
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65
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66 /**
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67 * Logger used for logging with log4j.
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68 */
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69 private static Logger logger = Logger.getLogger(DefaultHistogram.class);
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70
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71 /**
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72 * Object storing some further parameter used for chart settings.
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73 */
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74 protected Map requestParameter;
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75
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76
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77 /**
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78 * Constructor to create DefaultHistogram objects.
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79 *
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80 * @param labels Labels to decorate this chart.
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81 * @param data Raw data to be displayed in histogram.
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82 * @param theme Theme used to adjust the chart look.
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83 * @param requestParameter Object which serves some further settings.
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84 */
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85 public DefaultHistogram(
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86 ChartLabels labels, Object[] data, ChartTheme theme, Map requestParameter
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87 ) {
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88 super(labels, data, theme);
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89 this.requestParameter = requestParameter;
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90 }
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92
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93 /**
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94 * @see de.intevation.gnv.chart.AbstractHistogram#applyDatasets()
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95 */
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96 @Override
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97 protected void applyDatasets() {
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98 XYPlot plot = (XYPlot) chart.getPlot();
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99
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100 // prepare data and create add them to histogram dataset
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101 String name = (String) data[0];
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102 double[] values = toDouble((Double[]) data[1]);
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103 int bins = getBinCount(values);
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104
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105 HistogramDataset dataset = new HistogramDataset();
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106 dataset.addSeries(name, values, bins);
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107
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108 plot.setDataset(0, dataset);
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109 }
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111
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112 /**
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113 * Method which scans the hole bunch of values and returns an array with
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114 * contains min and max value. Min value is stored at position 0, max value
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115 * is stored at position 1 in that array.
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116 *
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117 * @param values Array which contains all values
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118 *
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119 * @return Array which contains min and max value
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120 */
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121 protected double[] getMinMax(double[] values) {
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122 double[] minmax = new double[2];
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123 minmax[0] = Double.MAX_VALUE;
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124 minmax[1] = Double.MIN_VALUE;
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125
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126 int length = values.length;
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127 for (int i = 0; i < length; i++) {
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128 minmax[0] = values[i] < minmax[0] ? values[i] : minmax[0];
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129 minmax[1] = values[i] > minmax[1] ? values[i] : minmax[1];
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130 }
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131
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132 return minmax;
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133 }
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134
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135
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136 /**
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137 * Turn a Double[] into a double[].
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138 *
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139 * @param array Doube[]
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140 *
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141 * @return double[]
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142 */
617
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143 protected double[] toDouble(Double[] array) {
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144 int length = array.length;
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145 double[] values = new double[length];
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146
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147 for(int i = 0; i < length; i++) {
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148 values[i] = array[i].doubleValue();
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149 }
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150
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151 return values;
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152 }
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153
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154
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155 /**
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156 * Method to calculate the number of bins this chart should be parted into.
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157 * The real calculation takes place in {@link #getBinCountByNumber} and
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158 * {@link #getBinCountByWidth}. This method switches between these methods
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159 * depending on the object stored in {@link #requestParameter}.
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160 *
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161 * @param values All values used in this histogram
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162 *
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163 * @return Number of bins
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164 */
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165 protected int getBinCount(double[] values) {
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166 String param = (String) requestParameter.get(REQUEST_KEY_BIN_CHOICE);
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167
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168 if (param != null && param.equalsIgnoreCase(REQUEST_KEY_BIN_WIDTH)) {
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169 return getBinCountByWidth(values);
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170 }
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171 else {
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172 return getBinCountByNumber();
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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 /**
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178 * Method to retrieve the number of bins. If {@link #requestParameter}
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179 * contains a valid <code>Integer</code> at
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180 * <code>REQUEST_KEY_BIN_COUNT</code> and this is smaller than or equal
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181 * {@link #MAXIMAL_BINS}, this value is used. If no valid
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182 * <code>Integer</code> is given or if the value in {@link #requestParameter}
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183 * is bigger than {@link #MAXIMAL_BINS}, {@link #DEFAULT_BINS} is used.
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184 *
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185 * @return Number of bins
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186 */
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187 protected int getBinCountByNumber() {
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188 int bins = -1;
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189 String param = (String) requestParameter.get(REQUEST_KEY_BIN_COUNT);
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190
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191 try {
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192 bins = Integer.parseInt(param);
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193 bins = bins <= 0 ? DEFAULT_BINS : bins;
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194 bins = bins > MAXIMAL_BINS ? MAXIMAL_BINS : bins;
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195
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196 return bins;
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197 }
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198 catch (NumberFormatException nfe) {
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199 logger.warn("Invalid number of bins for histogram chart: " + param);
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200 logger.warn("Return default bins: " + DEFAULT_BINS);
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201
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202 return DEFAULT_BINS;
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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 /**
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208 * Serves the number of bins depending on a given width for each bin, but
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209 * maximum bin count is limited by {@link MAXIMAL_BINS}.
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210 *
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211 * @param values All values in this histogram
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212 *
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213 * @return Number of bins
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214 */
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215 protected int getBinCountByWidth(double[] values) {
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216 int bins = -1;
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217 String param = (String) requestParameter.get(REQUEST_KEY_BIN_WIDTH);
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218 Locale locale = (Locale) requestParameter.get(REQUEST_KEY_LOCALE);
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219 NumberFormat format = NumberFormat.getInstance(locale);
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220
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221 try {
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222 double[] minmax = getMinMax(values);
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223 double totalWidth = minmax[1] - minmax[0];
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224 Number number = format.parse(param);
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225 double binWidth = -1d;
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226
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227 if (number instanceof Double) {
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228 binWidth = ((Double) number).doubleValue();
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229 }
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230 else if (number instanceof Long) {
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231 binWidth = ((Long) number).doubleValue();
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232 }
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233 else if (number instanceof Integer) {
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234 binWidth = ((Integer) number).doubleValue();
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235 }
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236 else {
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237 logger.warn("Invalid bin width for histogram chart: " + param);
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238 logger.warn("Return default bins: " + DEFAULT_BINS);
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239
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240 return DEFAULT_BINS;
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241 }
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242
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243 double tmpBins = totalWidth / binWidth;
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244
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245 bins = (int) Math.round(tmpBins);
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246 bins = bins <= 0 ? DEFAULT_BINS : bins;
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247 bins = bins > MAXIMAL_BINS ? MAXIMAL_BINS : bins;
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248
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249 return bins;
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250 }
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251 catch (ParseException pe) {
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252 logger.warn("Invalid bin width for histogram chart: " + param);
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253 logger.warn("Return default bins: " + DEFAULT_BINS);
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parents: 623
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254
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parents: 623
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255 return DEFAULT_BINS;
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parents: 623
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256 }
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parents: 623
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257 catch (NumberFormatException nfe) {
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parents: 623
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258 logger.warn("Invalid bin width for histogram chart: " + param);
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parents: 623
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259 logger.warn("Return default bins: " + DEFAULT_BINS);
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parents: 623
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260
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parents: 623
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261 return DEFAULT_BINS;
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parents: 623
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262 }
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 623
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263 }
617
3d13fa281a7e Added new ouput mode: histogram.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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264 }
3d13fa281a7e Added new ouput mode: histogram.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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265 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :

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