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annotate src/luan/LuanCloner.java @ 1304:5b947f29ea87 0.23

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minor
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 13 Jan 2019 18:22:14 -0700
parents d69d3c51c44e
children e0cf0d108a77
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1 package luan;
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3 import java.util.Map;
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4 import java.util.HashMap;
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5 import java.util.IdentityHashMap;
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7
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8 public final class LuanCloner {
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9 public enum Type { COMPLETE, INCREMENTAL }
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10
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11 public final Type type;
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12 private final Map cloned = new IdentityHashMap();
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13
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14 public LuanCloner(Type type) {
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15 this.type = type;
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16 }
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17
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18 public LuanCloneable clone(LuanCloneable obj) {
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19 if( obj==null )
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20 return null;
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21 LuanCloneable rtn = (LuanCloneable)cloned.get(obj);
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22 if( rtn == null ) {
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23 rtn = obj.shallowClone();
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24 cloned.put(obj,rtn);
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25 obj.deepenClone(rtn,this);
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26 }
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27 return rtn;
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28 }
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29
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30 public Object[] clone(Object[] obj) {
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31 if( obj.length == 0 )
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32 return obj;
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33 Object[] rtn = (Object[])cloned.get(obj);
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34 if( rtn == null ) {
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35 rtn = obj.clone();
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36 cloned.put(obj,rtn);
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37 for( int i=0; i<rtn.length; i++ ) {
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38 rtn[i] = get(rtn[i]);
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39 }
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40 }
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41 return rtn;
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42 }
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43
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44 public Map clone(Map obj) {
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45 if( !obj.getClass().equals(HashMap.class) )
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46 throw new RuntimeException("can only clone HashMap");
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47 Map rtn = (Map)cloned.get(obj);
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48 if( rtn == null ) {
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49 rtn = new HashMap();
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50 for( Object stupid : obj.entrySet() ) {
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51 Map.Entry entry = (Map.Entry)stupid;
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52 rtn.put( get(entry.getKey()), get(entry.getValue()) );
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53 }
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54 }
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55 return rtn;
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56 }
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57
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58 public Object get(Object obj) {
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59 if( obj instanceof LuanCloneable )
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60 return clone((LuanCloneable)obj);
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61 if( obj instanceof Object[] )
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62 return clone((Object[])obj);
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63 if( obj instanceof Map )
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64 return clone((Map)obj);
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65 return obj;
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66 }
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67 }