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1
46 package groovy.util;
47
48 import groovy.lang.Closure;
49
50 import java.util.ArrayList  ;
51 import java.util.Comparator ;
52 import java.util.Iterator ;
53 import java.util.List ;
54
55
62 public class OrderBy implements Comparator {
63
64 List closures;
65
66 public OrderBy() {
67 this.closures = new ArrayList ();
68 }
69
70 public OrderBy(Closure closure) {
71 this();
72 closures.add(closure);
73 }
74
75 public OrderBy(List closures) {
76 this.closures = closures;
77 }
78
79 public void add(Closure closure) {
80 closures.add(closure);
81 }
82
83 public int compare(Object object1, Object object2) {
84 for (Iterator iter = closures.iterator(); iter.hasNext();) {
85 Closure closure = (Closure) iter.next();
86 Object value1 = closure.call(object1);
87 Object value2 = closure.call(object2);
88
89 if (value1 == value2) {
90 continue;
91 }
92 if (value1 == null) {
93 return -1;
94 }
95 if (value1 instanceof Comparable ) {
96 Comparable c1 = (Comparable ) value1;
97 return c1.compareTo(value2);
98 }
99 if (value1.equals(value2)) {
100 continue;
101 }
102 return value1.hashCode() - value2.hashCode();
103 }
104 return 0;
105 }
106 }
107 |
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