annotate flys-artifacts/src/main/java/de/intevation/flys/exports/ChartGenerator.java @ 652:8fa4c5c9cd1a

Charts are zoomed to a specified view if the attribute document for the chart creation contains an x and/or y range. flys-artifacts/trunk@2047 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 03 Jun 2011 06:47:51 +0000
parents bab867fb37e8
children 45cd58a2a2bb
rev   line source
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1 package de.intevation.flys.exports;
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2
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3 import java.io.IOException;
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4 import java.io.OutputStream;
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6 import javax.xml.xpath.XPathConstants;
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8 import org.apache.log4j.Logger;
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9
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10 import org.w3c.dom.Document;
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11 import org.w3c.dom.Node;
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13 import org.jfree.data.Range;
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15 import de.intevation.artifacts.Artifact;
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16 import de.intevation.artifacts.CallContext;
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18 import de.intevation.artifacts.ArtifactNamespaceContext;
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19 import de.intevation.artifacts.common.utils.XMLUtils;
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21 import de.intevation.flys.model.River;
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22
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23 import de.intevation.flys.artifacts.FLYSArtifact;
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24 import de.intevation.flys.artifacts.resources.Resources;
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26
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27 /**
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28 * The base class for chart creation. It should provide some basic things that
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29 * equal in all chart types.
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30 *
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31 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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32 */
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33 public abstract class ChartGenerator implements OutGenerator {
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34
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35 private static Logger logger = Logger.getLogger(ChartGenerator.class);
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38 /** The default chart width, if no other width is set.*/
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39 public static final int DEFAULT_CHART_WIDTH = 600;
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40
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41 /** The default chart height, if no other height is set.*/
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42 public static final int DEFAULT_CHART_HEIGHT = 400;
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43
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44 /** The XPath that points to the chart size of the incoming request
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45 * document.*/
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46 public static final String XPATH_CHART_SIZE =
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47 "/art:action/art:attributes/art:size";
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49 public static final String XPATH_CHART_X_RANGE =
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50 "/art:action/art:attributes/art:xrange";
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51
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52 public static final String XPATH_CHART_Y_RANGE =
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53 "/art:action/art:attributes/art:yrange";
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56 /** The document of the incoming out() request.*/
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57 protected Document request;
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58
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59 /** The output stream where the data should be written to.*/
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60 protected OutputStream out;
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61
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62 /** The CallContext object.*/
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63 protected CallContext context;
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65 /** The artifact that is used to decorate the chart with meta information.*/
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66 protected Artifact master;
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68
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69 public void init(Document request, OutputStream out, CallContext context) {
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70 logger.debug("ChartGenerator.init");
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71
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72 this.request = request;
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73 this.out = out;
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74 this.context = context;
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75 }
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78 public void setMasterArtifact(Artifact master) {
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79 this.master = master;
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80 }
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81
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82
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83 protected String msg(String key, String def) {
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84 return Resources.getMsg(context.getMeta(), key, def);
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85 }
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88 protected String msg(String key, String def, Object[] args) {
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89 return Resources.getMsg(context.getMeta(), key, def, args);
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90 }
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91
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92
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93 protected String getRiverName() {
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94 FLYSArtifact flys = (FLYSArtifact) master;
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95
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96 River river = flys.getRiver();
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97 return river != null ? river.getName() : "";
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98 }
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99
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100
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101 protected double[] getRange() {
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102 FLYSArtifact flys = (FLYSArtifact) master;
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103
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104 return flys.getDistance();
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105 }
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106
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107
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108 /**
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109 * Returns the size of a chart export as array which has been specified by
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110 * the incoming request document.
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111 *
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112 * @return the size of a chart as [width, height] or the result of
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113 * getDefaultSize() if no width or height are given in the request document.
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114 */
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115 protected int[] getSize() {
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116 int[] size = new int[2];
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117
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118 Node sizeEl = (Node) XMLUtils.xpath(
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119 request,
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120 XPATH_CHART_SIZE,
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121 XPathConstants.NODE,
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diff changeset
122 ArtifactNamespaceContext.INSTANCE);
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123
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124 if (sizeEl != null) {
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125 String w = XMLUtils.xpathString(
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126 sizeEl, "@art:width", ArtifactNamespaceContext.INSTANCE);
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127
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128 String h = XMLUtils.xpathString(
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129 sizeEl, "@art:height", ArtifactNamespaceContext.INSTANCE);
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130
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131 if (w != null && w.length() > 0 && h != null && h.length() > 0) {
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132 try {
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133 size[0] = Integer.parseInt(w);
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134 size[1] = Integer.parseInt(h);
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135 }
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136 catch (NumberFormatException nfe) {
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137 logger.warn("Wrong values for chart width/height.");
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138 }
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139 }
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140 }
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141
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142 return size[0] > 0 && size[1] > 0 ? size : getDefaultSize();
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143 }
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144
bab867fb37e8 Charts are generated using the size defined in the incoming request document.
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145
652
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146 protected Range getDomainAxisRange() {
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147 Node xrange = (Node) XMLUtils.xpath(
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148 request,
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149 XPATH_CHART_X_RANGE,
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150 XPathConstants.NODE,
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151 ArtifactNamespaceContext.INSTANCE);
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152
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153 if (xrange == null) {
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154 return null;
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155 }
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156
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157 String lower = XMLUtils.xpathString(
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158 xrange, "@art:from", ArtifactNamespaceContext.INSTANCE);
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159
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160 String upper = XMLUtils.xpathString(
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161 xrange, "@art:to", ArtifactNamespaceContext.INSTANCE);
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162
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163 logger.debug("FOUND X RANGE: " + lower + " -> " + upper);
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164
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165 if (lower != null && upper != null) {
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166 try {
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167 double from = Double.parseDouble(lower);
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168 double to = Double.parseDouble(upper);
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169
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170 if (from == 0 && to == 0) {
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171 logger.debug("No range specified. Lower and upper X == 0");
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172 return null;
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173 }
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174
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175 if (from > to) {
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diff changeset
176 double tmp = to;
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177 to = from;
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178 from = tmp;
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179 }
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180
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181 return new Range(from, to);
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182 }
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diff changeset
183 catch (NumberFormatException nfe) {
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184 logger.warn("Wrong values for domain axis range.");
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185 }
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186 }
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diff changeset
187
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diff changeset
188 return null;
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diff changeset
189 }
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190
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191
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diff changeset
192 protected Range getValueAxisRange() {
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diff changeset
193 Node yrange = (Node) XMLUtils.xpath(
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diff changeset
194 request,
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diff changeset
195 XPATH_CHART_Y_RANGE,
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diff changeset
196 XPathConstants.NODE,
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diff changeset
197 ArtifactNamespaceContext.INSTANCE);
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diff changeset
198
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diff changeset
199 if (yrange == null) {
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diff changeset
200 return null;
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diff changeset
201 }
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diff changeset
202
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diff changeset
203 String lower = XMLUtils.xpathString(
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diff changeset
204 yrange, "@art:from", ArtifactNamespaceContext.INSTANCE);
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diff changeset
205
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diff changeset
206 String upper = XMLUtils.xpathString(
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diff changeset
207 yrange, "@art:to", ArtifactNamespaceContext.INSTANCE);
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diff changeset
208
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diff changeset
209 if (lower != null && upper != null) {
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diff changeset
210 try {
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diff changeset
211 double from = Double.parseDouble(lower);
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diff changeset
212 double to = Double.parseDouble(upper);
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diff changeset
213
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diff changeset
214 if (from == 0 && to == 0) {
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diff changeset
215 logger.debug("No range specified. Lower and upper Y == 0");
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diff changeset
216 return null;
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diff changeset
217 }
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diff changeset
218
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diff changeset
219 if (from > to) {
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diff changeset
220 double tmp = to;
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diff changeset
221 to = from;
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diff changeset
222 from = tmp;
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diff changeset
223 }
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diff changeset
224
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diff changeset
225 return new Range(from, to);
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diff changeset
226 }
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diff changeset
227 catch (NumberFormatException nfe) {
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diff changeset
228 logger.warn("Wrong values for value axis range.");
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diff changeset
229 }
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diff changeset
230 }
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231
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232 return null;
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233 }
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234
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235
423
bab867fb37e8 Charts are generated using the size defined in the incoming request document.
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236 /**
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237 * Returns the default size of a chart export as array.
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238 *
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239 * @return the default size of a chart as [width, height].
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240 */
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241 protected int[] getDefaultSize() {
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242 return new int[] { DEFAULT_CHART_WIDTH, DEFAULT_CHART_HEIGHT };
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243 }
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244
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245
364
8830eecad69e Added the name of the facet to the parameterlist of OutGenerator.doOut().
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246 public abstract void doOut(Artifact artifact, String facet, Document attr);
348
635af5381a4d Added an abstract OutGenerator that should be the base class for all generators which create charts.
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247
635af5381a4d Added an abstract OutGenerator that should be the base class for all generators which create charts.
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248 public abstract void generate() throws IOException;
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249 }
635af5381a4d Added an abstract OutGenerator that should be the base class for all generators which create charts.
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250 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

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