Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/IJKey.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 d766fe2d917a
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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8
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9 package de.intevation.gnv.math;
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10
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11 import java.io.Serializable;
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12
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13 /**
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14 * Tuple (i, j) to model a pair of integers. Useful to store index pairs
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15 * in maps.
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16 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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17 */
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18 public class IJKey
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19 implements Serializable
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20 {
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21 /**
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22 * i component of the tuple.
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23 */
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24 public int i;
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25 /**
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26 * j component of the tuple.
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27 */
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28 public int j;
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29
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30 /**
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31 * Default constructor.
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32 */
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33 public IJKey() {
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34 }
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35
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36 /**
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37 * Constructor to set i and j.
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38 * @param i The i component.
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39 * @param j The j component.
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40 */
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41 public IJKey(int i, int j) {
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42 this.i = i;
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43 this.j = j;
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44 }
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45
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46 /**
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47 * Orders i and j by their values.
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48 */
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49 public void sort() {
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50 if (i > j) {
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51 int t = i;
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52 i = j;
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53 j = t;
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54 }
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55 }
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56
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57 /**
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58 * Hashes i and j into a common value.
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59 * @return the hash code.
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60 */
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61 @Override
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62 public int hashCode() {
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63 return (i << 16) | j;
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64 }
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65
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66 /**
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67 * IJKeys are considered equal if the i and j components
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68 * are equal.
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69 * @param obj The other IJKey
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70 * @return true if the IJKeys are equal else false.
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71 */
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72 @Override
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73 public boolean equals(Object obj) {
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74 if (!(obj instanceof IJKey)) {
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75 return false;
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76 }
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77 IJKey other = (IJKey)obj;
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78 return i == other.i && j == other.j;
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79 }
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80 }
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81 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org