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comparison src/luan/DeepCloner.java @ 77:4bf3d0c0b6b9

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make LuanState cloneable git-svn-id: https://luan-java.googlecode.com/svn/trunk@78 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 15 Feb 2013 09:55:17 +0000
parents
children 7c08b611125d
comparison
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76:97b03fc807ad 77:4bf3d0c0b6b9
1 package luan;
2
3 import java.util.Map;
4 import java.util.IdentityHashMap;
5
6
7 public final class DeepCloner {
8 private final Map<Object,Object> cloned = new IdentityHashMap<Object,Object>();
9
10 public <T extends DeepCloneable<T>> T deepClone(T obj) {
11 @SuppressWarnings("unchecked")
12 T rtn = (T)cloned.get(obj);
13 if( rtn == null ) {
14 rtn = obj.shallowClone();
15 cloned.put(obj,rtn);
16 obj.deepenClone(rtn,this);
17 }
18 return rtn;
19 }
20
21 public void deepenClone(Object[] a) {
22 for( int i=0; i<a.length; i++ ) {
23 a[i] = get(a[i]);
24 }
25 }
26
27 public Object get(Object obj) {
28 if( !(obj instanceof DeepCloneable) )
29 return obj;
30 @SuppressWarnings("unchecked")
31 DeepCloneable dc = deepClone((DeepCloneable)obj);
32 return dc;
33 }
34 }