Mercurial > dive4elements > gnv-client
comparison gnv-artifacts/src/main/java/de/intevation/gnv/math/IJKey.java @ 875:5e9efdda6894
merged gnv-artifacts/1.0
| author | Thomas Arendsen Hein <thomas@intevation.de> |
|---|---|
| date | Fri, 28 Sep 2012 12:13:56 +0200 |
| parents | d766fe2d917a |
| children | f953c9a559d8 |
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| 722:bb3ffe7d719e | 875:5e9efdda6894 |
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| 1 package de.intevation.gnv.math; | |
| 2 | |
| 3 import java.io.Serializable; | |
| 4 | |
| 5 /** | |
| 6 * Tuple (i, j) to model a pair of integers. Useful to store index pairs | |
| 7 * in maps. | |
| 8 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> | |
| 9 */ | |
| 10 public class IJKey | |
| 11 implements Serializable | |
| 12 { | |
| 13 /** | |
| 14 * i component of the tuple. | |
| 15 */ | |
| 16 public int i; | |
| 17 /** | |
| 18 * j component of the tuple. | |
| 19 */ | |
| 20 public int j; | |
| 21 | |
| 22 /** | |
| 23 * Default constructor. | |
| 24 */ | |
| 25 public IJKey() { | |
| 26 } | |
| 27 | |
| 28 /** | |
| 29 * Constructor to set i and j. | |
| 30 * @param i The i component. | |
| 31 * @param j The j component. | |
| 32 */ | |
| 33 public IJKey(int i, int j) { | |
| 34 this.i = i; | |
| 35 this.j = j; | |
| 36 } | |
| 37 | |
| 38 /** | |
| 39 * Orders i and j by their values. | |
| 40 */ | |
| 41 public void sort() { | |
| 42 if (i > j) { | |
| 43 int t = i; | |
| 44 i = j; | |
| 45 j = t; | |
| 46 } | |
| 47 } | |
| 48 | |
| 49 /** | |
| 50 * Hashes i and j into a common value. | |
| 51 * @return the hash code. | |
| 52 */ | |
| 53 @Override | |
| 54 public int hashCode() { | |
| 55 return (i << 16) | j; | |
| 56 } | |
| 57 | |
| 58 /** | |
| 59 * IJKeys are considered equal if the i and j components | |
| 60 * are equal. | |
| 61 * @param obj The other IJKey | |
| 62 * @return true if the IJKeys are equal else false. | |
| 63 */ | |
| 64 @Override | |
| 65 public boolean equals(Object obj) { | |
| 66 if (!(obj instanceof IJKey)) { | |
| 67 return false; | |
| 68 } | |
| 69 IJKey other = (IJKey)obj; | |
| 70 return i == other.i && j == other.j; | |
| 71 } | |
| 72 } | |
| 73 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |