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annotate src/luan/interp/UpValue.java @ 78:7c08b611125d

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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>
date Fri, 15 Feb 2013 22:29:16 +0000
parents 4bf3d0c0b6b9
children 6db8f286fa6c
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1 package luan.interp;
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3 import luan.DeepCloner;
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4 import luan.DeepCloneable;
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7 final class UpValue implements DeepCloneable<UpValue> {
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8 private Object[] stack;
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9 private int index;
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10 private boolean isClosed = false;
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11 private Object value;
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13 UpValue(Object[] stack,int index) {
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14 this.stack = stack;
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15 this.index = index;
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16 }
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18 UpValue(Object value) {
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19 this.value = value;
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20 this.isClosed = true;
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21 }
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23 private UpValue() {}
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25 @Override public UpValue shallowClone() {
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26 return new UpValue();
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27 }
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29 @Override public void deepenClone(UpValue clone,DeepCloner cloner) {
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30 clone.isClosed = isClosed;
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31 if( isClosed ) {
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32 clone.value = cloner.get(value);
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33 } else {
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34 clone.stack = cloner.deepClone(stack);
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35 clone.index = index;
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36 }
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37 }
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39 Object get() {
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40 return isClosed ? value : stack[index];
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41 }
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43 void set(Object value) {
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44 if( isClosed ) {
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45 this.value = value;
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46 } else {
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47 stack[index] = value;
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48 }
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49 }
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51 void close() {
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52 value = stack[index];
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53 isClosed = true;
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54 stack = null;
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55 }
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57 static interface Getter {
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58 public UpValue get(LuanStateImpl luan);
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59 }
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61 static final class StackGetter implements Getter {
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62 private final int index;
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64 StackGetter(int index) {
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65 this.index = index;
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66 }
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68 public UpValue get(LuanStateImpl luan) {
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69 return luan.getUpValue(index);
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70 }
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71 }
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73 static final class NestedGetter implements Getter {
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74 private final int index;
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76 NestedGetter(int index) {
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77 this.index = index;
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78 }
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80 public UpValue get(LuanStateImpl luan) {
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81 return luan.closure().upValues()[index];
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82 }
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83 }
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85 static final Getter globalGetter = new Getter() {
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86 public UpValue get(LuanStateImpl luan) {
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87 return new UpValue(luan.global());
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88 }
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89 };
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91 }