Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/histogram/HistogramHelper.java @ 773:5fb1ea68e19c

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Avoid danger to get a NullPointerException if no time to live is served by CallContext. gnv-artifacts/trunk@832 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 26 Mar 2010 09:55:28 +0000
parents d70cac2bafc0
children b1f5f2a8840f
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
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16 /**
770
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17 * This class supports some helper methods for histogram charts.
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18 *
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19 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
617
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20 */
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21 public class HistogramHelper {
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22
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23 /**
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24 * Logger used for logging with log4j.
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25 */
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26 private static Logger logger = Logger.getLogger(HistogramHelper.class);
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27
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28
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29 /**
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30 * Disabled HistogramHelper constructor. This is a helper class and no
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31 * instance should be instantiated from this class.
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32 */
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33 private HistogramHelper() {
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34 }
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35
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36
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37 /**
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38 * This function prepare some input data and turns it into an array which is
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39 * taken by {@link de.intevation.gnv.chart.DefaultHistogram}.
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40 *
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41 * @param input A collection with the data used to be displayed in a
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42 * histogram
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43 * @param parameters A collection with a bunch of parameters
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44 * @param measurements A collection with a bunch of measurements
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45 * @param dates A collection with a bunch of dates
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46 *
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47 * @return Object[][] containing raw data which can be used to create
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48 * histograms
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49 */
617
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50 public static Object[][] prepareHistogramData(
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51 Collection input,
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52 Collection parameters,
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53 Collection measurements,
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54 Collection dates
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55 ) {
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56 List names = new ArrayList<String>();
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57 List data = new ArrayList<Double[]>();
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58
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59 if (logger.isDebugEnabled()) {
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60 logger.debug("############ prepare histogram data ##########");
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61 logger.debug("Input data size: " + input.size());
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62 }
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63
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64 if (input == null) {
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65 return new Object[0][0];
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66 }
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67
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68 String break1, break2, break3;
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69 int b1Idx = -1;
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70 int b2Idx = -1;
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71 int b3Idx = -1;
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72 int yIdx = -1;
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73 try {
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74 Iterator iter = input.iterator();
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75
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76 if (iter.hasNext()) {
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77 Result row = (Result) iter.next();
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78 Result previousRow = row;
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79
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80 if (b1Idx == -1) {
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81 ResultDescriptor rd = row.getResultDescriptor();
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82 b1Idx = rd.getColumnIndex("GROUP1");
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83 b2Idx = rd.getColumnIndex("GROUP2");
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84 b3Idx = rd.getColumnIndex("GROUP3");
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85 yIdx = rd.getColumnIndex("YORDINATE");
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86
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87 if (b1Idx == -1 || b2Idx == -1 || b3Idx == -1 || yIdx == -1) {
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88 return new Object[0][0];
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89 }
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90 }
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91 break1 = row.getString(b1Idx);
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92 break2 = row.getString(b2Idx);
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93 break3 = row.getString(b3Idx);
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94
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95 List values = new ArrayList<Double>();
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96 while (iter.hasNext()) {
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97
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98 // found new series
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99 if (!break1.equals(row.getString(b1Idx))
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100 || !break2.equals(row.getString(b2Idx))
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101 || !break3.equals(row.getString(b3Idx))
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102 ) {
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103
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104 // get parameter name
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105 String name = generateName(
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106 break1, break2, break3,
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107 parameters, measurements, dates
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108 );
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109
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110 // add values and parameter name
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111 data.add((Double[]) values.toArray(new Double[values.size()]));
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112 names.add(name);
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113
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114 if (logger.isDebugEnabled()) {
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115 logger.debug(" --- series name: " + name);
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116 logger.debug(" --- series items: " + values.size());
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117 }
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118
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119 values.clear();
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120
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121 Double yValue = row.getDouble(yIdx);
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122 if (yValue != null)
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123 values.add(yValue);
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124
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125 // set new conditions to find new series
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126 break1 = row.getString(b1Idx);
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127 break2 = row.getString(b2Idx);
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128 break3 = row.getString(b3Idx);
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129
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130 previousRow = row;
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131 row = (Result) iter.next();
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132 } else {
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133
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134 Double value = row.getDouble(yIdx);
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135 if (value != null)
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136 values.add(value);
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137
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138 row = (Result) iter.next();
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139 }
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140 }
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141
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142 Double yValue = row.getDouble(yIdx);
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143 if (yValue != null)
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144 values.add(yValue);
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145
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146 String name = generateName(
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147 break1, break2, break3, parameters, measurements, dates);
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148
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149 if (logger.isDebugEnabled()) {
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150 logger.debug(" --- series name: " + name);
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151 logger.debug(" --- series items: " + values.size());
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152 }
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153
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154 data.add((Double[]) values.toArray(new Double[values.size()]));
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155 names.add(name);
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156 }
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157 }
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158 catch (Exception e) {
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159 logger.error(e.getMessage(), e);
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160 }
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161
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162 int series = data.size();
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163 logger.debug(" === Found total: " + series);
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164 Object[][] obj = new Object[series][2];
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165 for (int i = 0; i < series; i++) {
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166 obj[i][0] = names.get(i);
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167 obj[i][1] = (Double[]) data.get(i);
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168 }
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169
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170 return obj;
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171 }
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172
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173
770
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174 /**
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175 * This method generates a string made up of parameter name and a
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176 * measurement.
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177 *
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178 * @param break1 Id of a parameter.
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179 * @param break2 Id of a measurement.
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180 * @param break3 Id of a date.
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181 * @param parameters A collection with a bunch of parameters.
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182 * @param measurements A collection with a bunch of measurements.
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183 * @param dates A collection with a bunch of dates.
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184 *
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185 * @return Concatenated string (${parametername} + ${measurement} + m).
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186 */
617
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187 protected static String generateName(
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188 String break1, String break2, String break3,
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189 Collection parameters, Collection measurements, Collection dates)
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190 {
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191 return findValueTitle(parameters,break1) + " " +
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192 findValueTitle(measurements,break2) + "m";
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193 }
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194
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195
770
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196 /**
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197 * Find a value with the given <code>id</code> and return its description.
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198 *
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199 * @param values A collection which contains the value we are searching for
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200 * @param id Id of the value
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201 *
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202 * @return String representation of the value. An empty string is returned
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203 * if no value have been found with the given id.
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204 */
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205 protected static String findValueTitle(Collection values, String id) {
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206 if (values != null) {
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207 Iterator it = values.iterator();
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208
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209 while (it.hasNext()) {
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210 KeyValueDescibeData data = (KeyValueDescibeData) it.next();
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211
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212 if (id.equals(data.getKey())) {
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213 return data.getValue();
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214 }
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215 }
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216 }
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217 return "";
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218 }
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219 }
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220 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org