Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/LegendProcessor.java @ 4046:ca208b2f35a0

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
LegendProcessor: avoid redundant hashing. removed dead code.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sat, 06 Oct 2012 10:38:41 +0200
parents 7cc05da7e35c
children 3dc26ec2558d
rev   line source
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05c84d65988a Extracted legenditemaggregation from xychartgenerator.
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1 package de.intevation.flys.exports;
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2
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3 import java.awt.geom.Line2D;
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4 import java.util.ArrayList;
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5 import java.util.HashMap;
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6 import java.util.Iterator;
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7 import java.util.LinkedHashMap;
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8 import java.util.List;
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9 import java.util.Map;
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10
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11 import org.jfree.chart.LegendItem;
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12 import org.jfree.chart.LegendItemCollection;
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13 import org.jfree.chart.plot.XYPlot;
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14
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15
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16 /** Class to process Plots legends. */
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17 public abstract class LegendProcessor {
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18
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19 /** (Empty) shape for aggregated Legend Items. */
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20 private static final Line2D.Double SPACE = new Line2D.Double(0,0,0,0);
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21
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22
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23 /** Prevent instantiations. */
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24 private LegendProcessor() {
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25 }
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26
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27
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28 /**
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29 * Create a hash from a legenditem.
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30 * This hash can then be used to merge legend items labels.
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31 * @return hash for given legenditem to identify mergeables.
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32 */
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33 protected static String legendItemHash(LegendItem li) {
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34 // TODO Do proper implementation. Ensure that only mergable sets are created.
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35 // getFillPaint()
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36 // getFillPaintTransformer()
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37 // getLabel()
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38 // getLine()
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39 // getLinePaint()
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40 // getLineStroke()
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41 // getOutminePaint()
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42 // getOutlineStroke()
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43 // Shape getShape()
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44 // String getToolTipText()
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45 // String getURLText()
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46 // boolean isLineVisible()
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47 // boolean isShapeFilled()
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48 // boolean isShapeOutlineVisible()
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49 // boolean isShapeVisible()
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50 String hash = li.getLinePaint().toString();
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51 // XXX: DEAD CODE // String label = li.getLabel();
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52 /*if (label.startsWith("W (") || label.startsWith("W(")) {
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53 hash += "-W-";
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54 }
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55 else if (label.startsWith("Q(") || label.startsWith("Q (")) {
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56 hash += "-Q-";
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57 }*/
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58
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59 // WQ.java holds example of using regex Matcher/Pattern.
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60
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61 return hash;
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62 }
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63
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64
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65 /**
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66 * Create new legend entries, dependent on settings.
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67 * @param plot The plot for which to modify the legend.
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68 * @param threshold How many items are needed for aggregation to
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69 * be triggered?
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70 */
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71 public static void aggregateLegendEntries(XYPlot plot, int threshold) {
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72 LegendItemCollection old = plot.getLegendItems();
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73 // Find "similar" entries if aggregation is enabled.
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74
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75 int maxListSize = 0;
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76 int AGGR_THRESHOLD = threshold;
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77
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78 if (AGGR_THRESHOLD > old.getItemCount() || AGGR_THRESHOLD <= 0){
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79 return;
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80 }
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81
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82 HashMap<String, List<LegendItem>> entries = new LinkedHashMap<String, List<LegendItem>>();
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83 for (Iterator<LegendItem> i = old.iterator(); i.hasNext();) {
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84 LegendItem item = i.next();
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85 String hash = legendItemHash(item);
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86 List<LegendItem> itemList = entries.get(hash);
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87 if (itemList == null) {
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88 itemList = new ArrayList<LegendItem>();
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89 entries.put(hash, itemList);
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90 }
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91 itemList.add(item);
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92
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93 if (itemList.size() > maxListSize) {
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94 maxListSize = itemList.size();
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95 }
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96 }
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97
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98 if (maxListSize < AGGR_THRESHOLD) {
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99 // No need to do anything.
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100 return;
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101 }
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102
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103 // Run over collected entries, merge their names and create new
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104 // entry if needed.
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105 LegendItemCollection newLegend = new LegendItemCollection();
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106 for (List<LegendItem> itemList: entries.values()) {
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107 if (itemList.size() >= AGGR_THRESHOLD) {
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108 // Now do merging.
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109 // XXX: DEAD CODE // LegendItem item = itemList.get(0);
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110 // Unfortunately we cannot clone and just setDescription, as this
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111 // method was added in JFreeChart 1.0.14 (we are at .13).
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112
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113 // Remove the shapes of all but the first items,
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114 // to prevent "overfill" of legenditemblock.
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115 for (int i = 0; i < itemList.size(); i++) {
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116 if (i != 0) {
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117 LegendItem litem = itemList.get(i);
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118
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119 // Make shape and line really small.
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120 LegendItem merged = new LegendItem(
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121 "," + litem.getLabel(), litem.getDescription(), litem.getToolTipText(),
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122 litem.getURLText(), false, SPACE,
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123 false, litem.getFillPaint(), false,
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124 litem.getOutlinePaint(), litem.getOutlineStroke(), false,
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125 SPACE, litem.getLineStroke(), litem.getLinePaint());
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126 newLegend.add(merged);
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127 }
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128 else {
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129 newLegend.add(itemList.get(i));
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130 }
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131 }
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
diff changeset
132 }
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
diff changeset
133 else {
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
diff changeset
134 // Do not merge entries.
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
diff changeset
135 for (LegendItem li: itemList) {
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
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136 newLegend.add(li);
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
diff changeset
137 }
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
diff changeset
138 }
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
diff changeset
139 }
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
diff changeset
140
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
diff changeset
141 plot.setFixedLegendItems (newLegend);
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
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142 }
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
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143 }
05c84d65988a Extracted legenditemaggregation from xychartgenerator.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
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144 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org