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annotate src/luan/interp/UpValue.java @ 73:f86e4f77ef32

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add package module git-svn-id: https://luan-java.googlecode.com/svn/trunk@74 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 12 Feb 2013 09:46:45 +0000
parents 8ede219cd111
children 4bf3d0c0b6b9
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1 package luan.interp;
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4 final class UpValue {
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5 private Object[] stack;
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6 private int index;
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7 private boolean isClosed = false;
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8 private Object value;
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10 UpValue(Object[] stack,int index) {
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11 this.stack = stack;
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12 this.index = index;
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13 }
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15 UpValue(Object value) {
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16 this.value = value;
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17 this.isClosed = true;
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18 }
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20 Object get() {
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21 return isClosed ? value : stack[index];
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22 }
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24 void set(Object value) {
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25 if( isClosed ) {
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26 this.value = value;
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27 } else {
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28 stack[index] = value;
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29 }
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30 }
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32 void close() {
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33 value = stack[index];
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34 isClosed = true;
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35 stack = null;
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36 }
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38 static interface Getter {
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39 public UpValue get(LuanStateImpl luan);
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40 }
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42 static final class StackGetter implements Getter {
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43 private final int index;
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45 StackGetter(int index) {
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46 this.index = index;
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47 }
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49 public UpValue get(LuanStateImpl luan) {
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50 return luan.getUpValue(index);
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51 }
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52 }
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54 static final class NestedGetter implements Getter {
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55 private final int index;
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57 NestedGetter(int index) {
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58 this.index = index;
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59 }
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61 public UpValue get(LuanStateImpl luan) {
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62 return luan.closure().upValues[index];
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63 }
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64 }
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66 static final Getter globalGetter = new Getter() {
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67 public UpValue get(LuanStateImpl luan) {
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68 return new UpValue(luan.global);
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69 }
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70 };
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72 }