Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/histogram/HistogramHelper.java @ 1055:bb2679624c6a

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Implemented a new histogram dataset that takes the width of a single bin as well as the number of bins for the histogram (issue288). gnv-artifacts/trunk@1130 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 27 May 2010 07:41:14 +0000
parents b1f5f2a8840f
children 01e26528bb39
rev   line source
617
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1 package de.intevation.gnv.histogram;
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2
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3 import de.intevation.gnv.geobackend.base.Result;
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4 import de.intevation.gnv.geobackend.base.ResultDescriptor;
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5
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6 import de.intevation.gnv.state.describedata.KeyValueDescibeData;
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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.Iterator;
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11 import java.util.List;
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12
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13 import org.apache.log4j.Logger;
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14
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15 /**
770
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16 * This class supports some helper methods for histogram charts.
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17 *
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18 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
617
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19 */
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20 public class HistogramHelper {
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21
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22 /**
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23 * Logger used for logging with log4j.
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24 */
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25 private static Logger logger = Logger.getLogger(HistogramHelper.class);
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26
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27
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28 /**
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29 * Disabled HistogramHelper constructor. This is a helper class and no
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30 * instance should be instantiated from this class.
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31 */
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32 private HistogramHelper() {
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33 }
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34
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35
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36 /**
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37 * This function prepare some input data and turns it into an array which is
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38 * taken by {@link de.intevation.gnv.chart.DefaultHistogram}.
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39 *
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40 * @param input A collection with the data used to be displayed in a
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41 * histogram
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42 * @param parameters A collection with a bunch of parameters
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43 * @param measurements A collection with a bunch of measurements
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44 * @param dates A collection with a bunch of dates
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45 *
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46 * @return Object[][] containing raw data which can be used to create
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47 * histograms
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48 */
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49 public static Object[][] prepareHistogramData(
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50 Collection input,
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51 Collection parameters,
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52 Collection measurements,
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53 Collection dates
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54 ) {
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55 List names = new ArrayList<String>();
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56 List data = new ArrayList<Double[]>();
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57
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58 if (logger.isDebugEnabled()) {
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59 logger.debug("############ prepare histogram data ##########");
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60 logger.debug("Input data size: " + input.size());
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61 }
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62
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63 if (input == null) {
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64 return new Object[0][0];
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65 }
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66
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67 String break1, break2, break3;
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68 int b1Idx = -1;
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69 int b2Idx = -1;
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70 int b3Idx = -1;
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71 int yIdx = -1;
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72 try {
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73 Iterator iter = input.iterator();
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74
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75 if (iter.hasNext()) {
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76 Result row = (Result) iter.next();
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77 Result previousRow = row;
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78
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79 if (b1Idx == -1) {
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80 ResultDescriptor rd = row.getResultDescriptor();
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81 b1Idx = rd.getColumnIndex("GROUP1");
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82 b2Idx = rd.getColumnIndex("GROUP2");
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83 b3Idx = rd.getColumnIndex("GROUP3");
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84 yIdx = rd.getColumnIndex("YORDINATE");
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85
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86 if (b1Idx == -1 || b2Idx == -1 || b3Idx == -1 || yIdx == -1) {
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87 return new Object[0][0];
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88 }
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89 }
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90 break1 = row.getString(b1Idx);
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91 break2 = row.getString(b2Idx);
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92 break3 = row.getString(b3Idx);
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93
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94 List values = new ArrayList<Double>();
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95 while (iter.hasNext()) {
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96
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97 // found new series
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98 if (!break1.equals(row.getString(b1Idx))
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99 || !break2.equals(row.getString(b2Idx))
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100 || !break3.equals(row.getString(b3Idx))
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101 ) {
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102
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103 // get parameter name
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104 String name = generateName(
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105 break1, break2, break3,
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106 parameters, measurements, dates
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107 );
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108
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109 // add values and parameter name
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110 data.add((Double[]) values.toArray(new Double[values.size()]));
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111 names.add(name);
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112
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113 if (logger.isDebugEnabled()) {
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114 logger.debug(" --- series name: " + name);
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115 logger.debug(" --- series items: " + values.size());
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116 }
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117
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118 values.clear();
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119
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120 Double yValue = row.getDouble(yIdx);
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121 if (yValue != null)
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122 values.add(yValue);
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123
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124 // set new conditions to find new series
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125 break1 = row.getString(b1Idx);
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126 break2 = row.getString(b2Idx);
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127 break3 = row.getString(b3Idx);
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128
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129 previousRow = row;
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130 row = (Result) iter.next();
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131 } else {
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132
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133 Double value = row.getDouble(yIdx);
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134 if (value != null)
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135 values.add(value);
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136
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137 row = (Result) iter.next();
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138 }
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139 }
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140
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141 Double yValue = row.getDouble(yIdx);
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142 if (yValue != null)
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143 values.add(yValue);
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144
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145 String name = generateName(
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146 break1, break2, break3, parameters, measurements, dates);
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147
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148 if (logger.isDebugEnabled()) {
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149 logger.debug(" --- series name: " + name);
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150 logger.debug(" --- series items: " + values.size());
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151 }
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152
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153 data.add((Double[]) values.toArray(new Double[values.size()]));
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154 names.add(name);
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155 }
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156 }
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157 catch (Exception e) {
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158 logger.error(e.getMessage(), e);
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159 }
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160
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161 int series = data.size();
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162 logger.debug(" === Found total: " + series);
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163 Object[][] obj = new Object[series][2];
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164 for (int i = 0; i < series; i++) {
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165 obj[i][0] = names.get(i);
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166 obj[i][1] = (Double[]) data.get(i);
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167 }
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168
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169 return obj;
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170 }
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171
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172
770
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173 /**
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174 * This method generates a string made up of parameter name and a
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175 * measurement.
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176 *
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177 * @param break1 Id of a parameter.
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178 * @param break2 Id of a measurement.
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179 * @param break3 Id of a date.
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180 * @param parameters A collection with a bunch of parameters.
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181 * @param measurements A collection with a bunch of measurements.
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182 * @param dates A collection with a bunch of dates.
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183 *
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184 * @return Concatenated string (${parametername} + ${measurement} + m).
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185 */
617
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186 protected static String generateName(
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187 String break1, String break2, String break3,
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188 Collection parameters, Collection measurements, Collection dates)
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189 {
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190 return findValueTitle(parameters,break1) + " " +
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191 findValueTitle(measurements,break2) + "m";
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192 }
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193
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194
770
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195 /**
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196 * Find a value with the given <code>id</code> and return its description.
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197 *
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198 * @param values A collection which contains the value we are searching for
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199 * @param id Id of the value
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200 *
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201 * @return String representation of the value. An empty string is returned
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202 * if no value have been found with the given id.
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203 */
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204 protected static String findValueTitle(Collection values, String id) {
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205 if (values != null) {
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206 Iterator it = values.iterator();
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207
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208 while (it.hasNext()) {
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209 KeyValueDescibeData data = (KeyValueDescibeData) it.next();
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210
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211 if (id.equals(data.getKey())) {
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212 return data.getValue();
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213 }
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214 }
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215 }
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216 return "";
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217 }
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218 }
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219 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org