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annotate core/src/luan/impl/UpValue.java @ 576:4723d22062ce

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remove LuanBit
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 13 Jul 2015 20:38:26 -0600
parents c6bcb8859b93
children 71f8f5075df8
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1 package luan.impl;
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3 import luan.DeepCloner;
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4 import luan.DeepCloneable;
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5 import luan.LuanException;
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8 final class UpValue implements DeepCloneable {
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9 private Object[] stack;
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10 private int index;
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11 private boolean isClosed = false;
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12 private Object value;
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14 UpValue(Object[] stack,int index) {
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15 this.stack = stack;
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16 this.index = index;
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17 }
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19 UpValue(Object value) {
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20 this.value = value;
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21 this.isClosed = true;
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22 }
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24 private UpValue() {}
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26 @Override public UpValue shallowClone() {
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27 return new UpValue();
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28 }
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30 @Override public void deepenClone(DeepCloneable dc,DeepCloner cloner) {
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31 UpValue clone = (UpValue)dc;
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32 clone.isClosed = isClosed;
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33 if( isClosed ) {
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34 clone.value = cloner.get(value);
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35 } else {
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36 clone.stack = cloner.deepClone(stack);
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37 clone.index = index;
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38 }
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39 }
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41 Object get() {
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42 return isClosed ? value : stack[index];
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43 }
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45 void set(Object value) {
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46 if( isClosed ) {
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47 this.value = value;
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48 } else {
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49 stack[index] = value;
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50 }
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51 }
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53 void close() {
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54 value = stack[index];
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55 isClosed = true;
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56 stack = null;
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57 }
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59 static interface Getter {
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60 public UpValue get(LuanStateImpl luan) throws LuanException;
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61 }
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63 static final class StackGetter implements Getter {
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64 private final int index;
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66 StackGetter(int index) {
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67 this.index = index;
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68 }
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70 public UpValue get(LuanStateImpl luan) {
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71 return luan.getUpValue(index);
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72 }
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73 }
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75 static final class NestedGetter implements Getter {
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76 private final int index;
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78 NestedGetter(int index) {
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79 this.index = index;
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80 }
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82 public UpValue get(LuanStateImpl luan) {
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83 return luan.closure().upValues()[index];
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84 }
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85 }
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87 static final class ValueGetter implements Getter {
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88 private final UpValue upValue;
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90 ValueGetter(Object value) {
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91 this.upValue = new UpValue(value);
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92 }
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94 public UpValue get(LuanStateImpl luan) {
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95 return upValue;
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96 }
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97 }
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99 }