| 1 | package com.hammurapi.eventbus; |
| 2 | |
| 3 | import java.io.Serializable; |
| 4 | import java.util.Arrays; |
| 5 | |
| 6 | /** |
| 7 | * Mapper maps events from one array to another. |
| 8 | * @author Pavel Vlasov |
| 9 | * |
| 10 | */ |
| 11 | public class Mapper<E> implements Serializable { |
| 12 | |
| 13 | private int[] indexMap; |
| 14 | |
| 15 | /** |
| 16 | * @param indexMap Array elements contain target indices. |
| 17 | */ |
| 18 | public Mapper(int[] indexMap) { |
| 19 | this.indexMap = indexMap; |
| 20 | } |
| 21 | |
| 22 | boolean mapsTo(int idx) { |
| 23 | for (int i=0; i<indexMap.length; ++i) { |
| 24 | if (idx==indexMap[i]) { |
| 25 | return true; |
| 26 | } |
| 27 | } |
| 28 | return false; |
| 29 | } |
| 30 | |
| 31 | public int[] getIndexMap() { |
| 32 | return indexMap; |
| 33 | } |
| 34 | |
| 35 | /** |
| 36 | * Maps events from input to output. |
| 37 | * @param input |
| 38 | * @param output |
| 39 | */ |
| 40 | void map(E[] input, E[] output) { |
| 41 | if (input!=null) { |
| 42 | for (int i=0; i<input.length; ++i) { |
| 43 | if (output.length>indexMap[i]) { |
| 44 | output[indexMap[i]] = input[i]; |
| 45 | } |
| 46 | } |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | @Override |
| 51 | public int hashCode() { |
| 52 | final int prime = 31; |
| 53 | int result = 1; |
| 54 | result = prime * result + Arrays.hashCode(indexMap); |
| 55 | return result; |
| 56 | } |
| 57 | |
| 58 | @Override |
| 59 | public boolean equals(Object obj) { |
| 60 | if (this == obj) |
| 61 | return true; |
| 62 | if (obj == null) |
| 63 | return false; |
| 64 | if (getClass() != obj.getClass()) |
| 65 | return false; |
| 66 | Mapper other = (Mapper) obj; |
| 67 | if (!Arrays.equals(indexMap, other.indexMap)) |
| 68 | return false; |
| 69 | return true; |
| 70 | } |
| 71 | |
| 72 | @Override |
| 73 | public String toString() { |
| 74 | return "Mapper [indexMap=" + Arrays.toString(indexMap) + "]"; |
| 75 | } |
| 76 | |
| 77 | } |