Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/jfreechart/LevelOrderIndices.java @ 798:6cff63d0c434

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Fixed vim modeline. Added some Javadoc. gnv-artifacts/trunk@880 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 06 Apr 2010 11:05:00 +0000
parents cdade5005cba
children 22c18083225e
rev   line source
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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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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 /**
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11 *
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12 */
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13 public interface Visitor {
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14 /**
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15 *
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16 * @param index
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17 * @return
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18 */
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19 Object visit(int index);
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20 }
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21
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22 /**
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23 *
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24 */
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25 protected int from;
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26 /**
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27 *
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28 */
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29 protected int to;
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30
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31 /**
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32 *
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33 */
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34 public LevelOrderIndices() {
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35 }
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36
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37 /**
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38 *
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39 * @param to
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40 */
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41 public LevelOrderIndices(int to) {
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42 this(0, to);
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43 }
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44
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45 /**
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46 *
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47 * @param from
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48 * @param to
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49 */
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50 public LevelOrderIndices(int from, int to) {
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51 this.from = Math.min(from, to);
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52 this.to = Math.max(from, to);
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53 }
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54
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55 /**
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56 *
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57 * @param visitor
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58 * @return
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59 */
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60 public Object visit(Visitor visitor) {
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61 LinkedList<int[]> queue = new LinkedList<int[]>();
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62
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63 queue.add(new int [] { from, to });
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64
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65 while (!queue.isEmpty()) {
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66 int [] pair = queue.remove();
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67
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68 int mid = (pair[0] + pair[1]) >> 1;
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69
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70 Object result = visitor.visit(mid);
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71
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72 if (result != null) {
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73 return result;
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74 }
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75
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76 if (mid-1 >= pair[0]) {
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77 queue.add(new int [] { pair[0], mid-1 });
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78 }
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79
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80 if (mid+1 <= pair[1]) {
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81 pair[0] = mid+1;
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82 queue.add(pair);
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83 }
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84 }
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85
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86 return null;
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87 }
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88 }
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89 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org