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view src/luan/DeepCloner.java @ 78:7c08b611125d
better deep cloning
git-svn-id: https://luan-java.googlecode.com/svn/trunk@79 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Fri, 15 Feb 2013 22:29:16 +0000 |
parents | 4bf3d0c0b6b9 |
children | 0149bdf98fd8 |
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package luan; import java.util.Map; import java.util.IdentityHashMap; public final class DeepCloner { private final Map<Object,Object> cloned = new IdentityHashMap<Object,Object>(); public <T extends DeepCloneable<T>> T deepClone(T obj) { @SuppressWarnings("unchecked") T rtn = (T)cloned.get(obj); if( rtn == null ) { rtn = obj.shallowClone(); cloned.put(obj,rtn); obj.deepenClone(rtn,this); } return rtn; } public <T> T[] deepClone(T[] obj) { if( obj.length == 0 ) return obj; @SuppressWarnings("unchecked") T[] rtn = (T[])cloned.get(obj); if( rtn == null ) { rtn = obj.clone(); cloned.put(obj,rtn); for( int i=0; i<rtn.length; i++ ) { @SuppressWarnings("unchecked") T t = (T)get(rtn[i]); rtn[i] = t; } } return rtn; } public Object get(Object obj) { if( !(obj instanceof DeepCloneable) ) return obj; @SuppressWarnings("unchecked") DeepCloneable dc = deepClone((DeepCloneable)obj); return dc; } }