|
1 package com.jofti.util;
2
3 import java.util.ArrayList  ;
4 import java.util.Comparator ;
5 import java.util.List ;
6
7 public class CompositeComparator implements Comparator {
8
9 List comparators = new ArrayList ();
10
11 public void addComparator(Comparator comp){
12 doAdd(comp,false);
13 }
14
15 public void addComparator(Comparator comp,boolean reverse){
16 doAdd(comp,reverse);
17 }
18
19 private void doAdd(Comparator comp, boolean reverse){
20 comparators.add(new ComparatorWrapper(comp,reverse));
21
22 }
23
24 public int getSize(){
25 return comparators.size();
26 }
27
28 public boolean isReversed(int index){
29 if (index < comparators.size()){
30 return ((ComparatorWrapper)comparators.get(index)).isReversed();
31 }
32 return false;
33 }
34
35 public Comparator getComparator(int index){
36 return (Comparator )comparators.get(index);
37 }
38 public int compare(Object arg0, Object arg1) {
39
40 for (int i=0;i<comparators.size();i++){
41 ComparatorWrapper comp = (ComparatorWrapper)comparators.get(i);
42
43
44 int val = comp.compare(arg0,arg1);
45
46 if (val !=0){
47 if (comp.isReversed()){
48 if(Integer.MIN_VALUE == val) {
49 val = Integer.MAX_VALUE;
50 } else {
51 val *= -1;
52 }
53 }
54 return val;
55 }
56
57 }
58 return 0;
59
60 }
61
62 class ComparatorWrapper implements Comparator {
63
64 public Comparator comp =null;
65 boolean reverse =false;
66
67 public ComparatorWrapper(Comparator comp, boolean reverse){
68 this.comp=comp;
69 this.reverse=reverse;
70 }
71 public int compare(Object o1, Object o2) {
72 return comp.compare(o1,o2);
74 }
75
76 boolean isReversed(){
77 return reverse;
78 }
79
80 }
81
82 }
83 |
Popular Tags |
Java API By Example, From Geeks To Geeks.