Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/IJKey.java @ 801:d766fe2d917a

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More javadoc. gnv-artifacts/trunk@883 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 06 Apr 2010 16:53:43 +0000
parents 6cff63d0c434
children f953c9a559d8
rev   line source
431
422275fc9927 Refactored the XYColumn and Point2d code a bit to be more reusable in 3D.
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1 package de.intevation.gnv.math;
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2
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3 import java.io.Serializable;
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4
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5 /**
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6 * Tuple (i, j) to model a pair of integers. Useful to store index pairs
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7 * in maps.
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8 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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9 */
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10 public class IJKey
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11 implements Serializable
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12 {
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13 /**
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14 * i component of the tuple.
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15 */
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16 public int i;
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17 /**
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18 * j component of the tuple.
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19 */
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20 public int j;
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21
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22 /**
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23 * Default constructor.
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24 */
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25 public IJKey() {
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26 }
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27
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28 /**
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29 * Constructor to set i and j.
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30 * @param i The i component.
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31 * @param j The j component.
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32 */
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33 public IJKey(int i, int j) {
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34 this.i = i;
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35 this.j = j;
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36 }
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37
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38 /**
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39 * Orders i and j by their values.
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40 */
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41 public void sort() {
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42 if (i > j) {
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43 int t = i;
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44 i = j;
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45 j = t;
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46 }
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47 }
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48
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49 /**
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50 * Hashes i and j into a common value.
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51 * @return the hash code.
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52 */
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53 @Override
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54 public int hashCode() {
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55 return (i << 16) | j;
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56 }
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57
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58 /**
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59 * IJKeys are considered equal if the i and j components
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60 * are equal.
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61 * @param obj The other IJKey
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62 * @return true if the IJKeys are equal else false.
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63 */
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64 @Override
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65 public boolean equals(Object obj) {
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66 if (!(obj instanceof IJKey)) {
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67 return false;
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68 }
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69 IJKey other = (IJKey)obj;
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70 return i == other.i && j == other.j;
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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=utf8 :
http://dive4elements.wald.intevation.org