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1 package com.thoughtworks.xstream.core.util;
2
3 import java.util.HashMap  ;
4 import java.util.List ;
5 import java.util.ArrayList ;
6 import java.util.Collection ;
7 import java.util.Collections ;
8 import java.util.Set ;
9 import java.util.TreeSet ;
10
11 public class OrderRetainingMap extends HashMap {
12
13 private Set keyOrder = new ArraySet();
14 private List valueOrder = new ArrayList ();
15
16 public Object put(Object key, Object value) {
17 keyOrder.add(key);
18 valueOrder.add(value);
19 return super.put(key, value);
20 }
21
22 public Collection values() {
23 return Collections.unmodifiableList(valueOrder);
24 }
25
26 public Set keySet() {
27 return Collections.unmodifiableSet(keyOrder);
28 }
29
30 public Set entrySet() {
31 throw new UnsupportedOperationException ();
32 }
33
34 private static class ArraySet extends ArrayList implements Set {
35 }
36
37 }
38 |
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