Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/jfreechart/LevelOrderIndices.java @ 1115:f953c9a559d8

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Added license file and license headers. gnv-artifacts/trunk@1260 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 02 Nov 2010 17:46:55 +0000
parents 22c18083225e
children
rev   line source
1115
f953c9a559d8 Added license file and license headers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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9 package de.intevation.gnv.jfreechart;
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10
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11 import java.util.LinkedList;
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12
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13 /**
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14 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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15 */
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16 public class LevelOrderIndices
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17 {
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18 public interface Visitor {
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19
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20 Object visit(int index);
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21 }
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22
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23
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24 protected int from;
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25
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26 protected int to;
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27
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28
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29 public LevelOrderIndices() {
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30 }
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31
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32
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33 public LevelOrderIndices(int to) {
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34 this(0, to);
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35 }
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36
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37
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38 public LevelOrderIndices(int from, int to) {
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39 this.from = Math.min(from, to);
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40 this.to = Math.max(from, to);
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41 }
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42
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43
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44 public Object visit(Visitor visitor) {
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45 LinkedList<int[]> queue = new LinkedList<int[]>();
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46
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47 queue.add(new int [] { from, to });
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48
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49 while (!queue.isEmpty()) {
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50 int [] pair = queue.remove();
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51
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52 int mid = (pair[0] + pair[1]) >> 1;
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53
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54 Object result = visitor.visit(mid);
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55
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56 if (result != null) {
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57 return result;
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58 }
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59
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60 if (mid-1 >= pair[0]) {
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61 queue.add(new int [] { pair[0], mid-1 });
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62 }
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63
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64 if (mid+1 <= pair[1]) {
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65 pair[0] = mid+1;
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66 queue.add(pair);
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67 }
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68 }
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69
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70 return null;
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71 }
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72 }
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73 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org