annotate gnv-artifacts/src/main/java/de/intevation/gnv/jfreechart/LevelOrderIndices.java @ 1059:174f6eacd595

Added queries for TimeSeriesPoints using vectorvalues for verticalprofiles gnv-artifacts/trunk@1138 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Mon, 31 May 2010 08:20:17 +0000
parents 22c18083225e
children f953c9a559d8
rev   line source
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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1 package de.intevation.gnv.jfreechart;
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2
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3 import java.util.LinkedList;
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4
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5 /**
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c4156275c1e1 Bring @author javadoc tags in form '@author <a href="john.doe@example.com">John Doe</a>'
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6 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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7 */
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8 public class LevelOrderIndices
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9 {
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10 public interface Visitor {
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11
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12 Object visit(int index);
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13 }
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14
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16 protected int from;
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17
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18 protected int to;
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19
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20
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21 public LevelOrderIndices() {
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22 }
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23
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24
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25 public LevelOrderIndices(int to) {
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26 this(0, to);
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27 }
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28
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29
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30 public LevelOrderIndices(int from, int to) {
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31 this.from = Math.min(from, to);
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32 this.to = Math.max(from, to);
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33 }
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34
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35
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36 public Object visit(Visitor visitor) {
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37 LinkedList<int[]> queue = new LinkedList<int[]>();
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38
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39 queue.add(new int [] { from, to });
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40
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41 while (!queue.isEmpty()) {
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42 int [] pair = queue.remove();
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43
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44 int mid = (pair[0] + pair[1]) >> 1;
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45
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46 Object result = visitor.visit(mid);
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47
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48 if (result != null) {
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49 return result;
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50 }
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51
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52 if (mid-1 >= pair[0]) {
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53 queue.add(new int [] { pair[0], mid-1 });
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54 }
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55
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56 if (mid+1 <= pair[1]) {
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57 pair[0] = mid+1;
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58 queue.add(pair);
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59 }
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60 }
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61
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62 return null;
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63 }
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64 }
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65 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :

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