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annotate src/luan/lib/JavaLib.java @ 60:a68ccb7aaa9c

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implement setting java field values git-svn-id: https://luan-java.googlecode.com/svn/trunk@61 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Mon, 07 Jan 2013 05:41:59 +0000
parents d6c454b7f58c
children 183d470be7e8
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37
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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diff changeset
1 package luan.lib;
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2
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3 import java.lang.reflect.Array;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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4 import java.lang.reflect.AccessibleObject;
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5 import java.lang.reflect.Member;
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6 import java.lang.reflect.Field;
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7 import java.lang.reflect.Method;
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8 import java.lang.reflect.Constructor;
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9 import java.lang.reflect.Modifier;
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10 import java.util.Map;
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11 import java.util.HashMap;
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12 import java.util.List;
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13 import java.util.ArrayList;
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14 import java.util.Iterator;
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9381b23ea9e1 various fixes
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15 import java.util.Collections;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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16 import luan.Luan;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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17 import luan.LuanState;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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18 import luan.LuanTable;
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19 import luan.MetatableGetter;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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20 import luan.LuanException;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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21 import luan.LuanFunction;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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22 import luan.LuanJavaFunction;
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23 import luan.LuanElement;
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26 public final class JavaLib {
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27
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28 public static void register(LuanState luan) {
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29 luan.addMetatableGetter(mg);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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30 LuanTable module = new LuanTable();
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31 LuanTable global = luan.global();
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32 global.put("java",module);
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33 try {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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34 global.put( "import", new LuanJavaFunction(JavaLib.class.getMethod("importClass",LuanState.class,String.class),null) );
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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35 module.put( "class", new LuanJavaFunction(JavaLib.class.getMethod("getClass",LuanState.class,String.class),null) );
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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36 } catch(NoSuchMethodException e) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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37 throw new RuntimeException(e);
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38 }
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39 }
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40
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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41 private static final LuanTable mt = new LuanTable();
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42 static {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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43 add( mt, "__index", LuanState.class, Object.class, Object.class );
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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44 add( mt, "__newindex", LuanState.class, Object.class, Object.class, Object.class );
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45 }
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46
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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47 private static void add(LuanTable t,String method,Class<?>... parameterTypes) {
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48 try {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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49 t.put( method, new LuanJavaFunction(JavaLib.class.getMethod(method,parameterTypes),null) );
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50 } catch(NoSuchMethodException e) {
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51 throw new RuntimeException(e);
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52 }
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53 }
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54
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55 private static final MetatableGetter mg = new MetatableGetter() {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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56 public LuanTable getMetatable(Object obj) {
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57 if( obj==null )
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58 return null;
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59 return mt;
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60 }
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61 };
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62
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63 public static Object __index(LuanState luan,Object obj,Object key) throws LuanException {
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64 if( obj instanceof Static ) {
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65 if( key instanceof String ) {
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66 String name = (String)key;
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67 Static st = (Static)obj;
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68 Class cls = st.cls;
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69 if( "class".equals(name) ) {
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70 return cls;
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71 } else if( "new".equals(name) ) {
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72 Constructor<?>[] constructors = cls.getConstructors();
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73 if( constructors.length > 0 ) {
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74 if( constructors.length==1 ) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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75 return new LuanJavaFunction(constructors[0],null);
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76 } else {
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77 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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78 for( Constructor constructor : constructors ) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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79 fns.add(new LuanJavaFunction(constructor,null));
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80 }
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81 return new AmbiguousJavaFunction(fns);
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82 }
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83 }
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84 } else {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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85 List<Member> members = getStaticMembers(cls,name);
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86 if( !members.isEmpty() ) {
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87 return member(null,members);
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88 }
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89 }
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90 }
56
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91 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for: "+obj);
37
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92 }
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93 Class cls = obj.getClass();
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94 if( cls.isArray() ) {
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95 if( "length".equals(key) ) {
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96 return Array.getLength(obj);
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97 }
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98 Integer i = Luan.asInteger(key);
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parents: 44
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99 if( i != null ) {
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100 return Array.get(obj,i);
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101 }
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102 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java array: "+obj);
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103 }
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104 if( key instanceof String ) {
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105 String name = (String)key;
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106 if( "instanceof".equals(name) ) {
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107 return new LuanJavaFunction(instanceOf,new InstanceOf(obj));
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108 } else {
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109 List<Member> members = getMembers(cls,name);
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110 if( !members.isEmpty() ) {
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111 return member(obj,members);
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112 }
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113 }
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114 }
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115 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java object: "+obj);
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116 }
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117
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118 private static Object member(Object obj,List<Member> members) throws LuanException {
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119 try {
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120 for( Member m : members ) {
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121 if( m instanceof AccessibleObject )
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122 ((AccessibleObject)m).setAccessible(true);
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123 }
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124 if( members.size()==1 ) {
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125 Member member = members.get(0);
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126 if( member instanceof Static ) {
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127 return member;
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128 } else if( member instanceof Field ) {
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129 Field field = (Field)member;
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130 return field.get(obj);
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131 } else {
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132 Method method = (Method)member;
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133 return new LuanJavaFunction(method,obj);
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134 }
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135 } else {
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136 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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137 for( Member member : members ) {
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138 Method method = (Method)member;
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139 fns.add(new LuanJavaFunction(method,obj));
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140 }
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141 return new AmbiguousJavaFunction(fns);
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142 }
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143 } catch(IllegalAccessException e) {
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144 throw new RuntimeException(e);
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145 }
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146 }
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147
60
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148 public static void __newindex(LuanState luan,Object obj,Object key,Object value) throws LuanException {
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149 if( obj instanceof Static ) {
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150 if( key instanceof String ) {
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151 String name = (String)key;
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152 Static st = (Static)obj;
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153 Class cls = st.cls;
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154 List<Member> members = getStaticMembers(cls,name);
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155 if( !members.isEmpty() ) {
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156 if( members.size() != 1 )
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157 throw new RuntimeException("not field '"+name+"' of "+obj);
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158 setMember(obj,members,value);
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159 return;
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160 }
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161 }
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162 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for: "+obj);
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163 }
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164 Class cls = obj.getClass();
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165 if( cls.isArray() ) {
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166 Integer i = Luan.asInteger(key);
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167 if( i != null ) {
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168 Array.set(obj,i,value);
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169 return;
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170 }
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171 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java array: "+obj);
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172 }
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173 if( key instanceof String ) {
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174 String name = (String)key;
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175 List<Member> members = getMembers(cls,name);
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176 if( !members.isEmpty() ) {
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177 if( members.size() != 1 )
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178 throw new RuntimeException("not field '"+name+"' of "+obj);
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179 setMember(obj,members,value);
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180 return;
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181 }
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182 }
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diff changeset
183 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java object: "+obj);
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184 }
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185
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diff changeset
186 private static void setMember(Object obj,List<Member> members,Object value) {
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187 Field field = (Field)members.get(0);
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188 try {
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189 field.set(obj,value);
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diff changeset
190 } catch(IllegalAccessException e) {
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diff changeset
191 throw new RuntimeException(e);
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192 }
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193 }
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194
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195 private static Map<Class,Map<String,List<Member>>> memberMap = new HashMap<Class,Map<String,List<Member>>>();
37
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196
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197 private static synchronized List<Member> getMembers(Class cls,String name) {
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198 Map<String,List<Member>> clsMap = memberMap.get(cls);
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199 if( clsMap == null ) {
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200 clsMap = new HashMap<String,List<Member>>();
58
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diff changeset
201 for( Method method : cls.getMethods() ) {
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202 String s = method.getName();
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203 List<Member> list = clsMap.get(s);
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204 if( list == null ) {
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205 list = new ArrayList<Member>();
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206 clsMap.put(s,list);
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207 }
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208 list.add(method);
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209 }
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210 for( Class c : cls.getClasses() ) {
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211 String s = c.getSimpleName();
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212 List<Member> list = clsMap.get(s);
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213 if( list == null ) {
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214 list = new ArrayList<Member>();
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215 clsMap.put(s,list);
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216 }
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217 list.add(new Static(c));
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218 }
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219 for( Field field : cls.getFields() ) {
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220 String s = field.getName();
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221 try {
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222 if( !cls.getField(s).equals(field) )
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223 continue; // not accessible
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224 } catch(NoSuchFieldException e) {
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225 throw new RuntimeException(e);
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226 }
56
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227 List<Member> list = clsMap.get(s);
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228 if( list != null )
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229 throw new RuntimeException("can't add field '"+s+"' to "+cls+" because these are already defined: "+list);
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230 list = new ArrayList<Member>();
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231 clsMap.put(s,list);
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232 list.add(field);
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233 }
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234 memberMap.put(cls,clsMap);
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235 }
56
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236 List<Member> rtn = clsMap.get(name);
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237 if( rtn==null )
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238 rtn = Collections.emptyList();
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239 return rtn;
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240 }
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241
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242 private static synchronized List<Member> getStaticMembers(Class cls,String name) {
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243 List<Member> staticMembers = new ArrayList<Member>();
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244 for( Member m : getMembers(cls,name) ) {
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245 if( Modifier.isStatic(m.getModifiers()) )
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246 staticMembers.add(m);
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247 }
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248 return staticMembers;
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249 }
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250
56
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251 static final class Static implements Member {
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252 final Class cls;
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253
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254 Static(Class cls) {
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255 this.cls = cls;
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256 }
56
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257
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258 @Override public String toString() {
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259 return cls.toString();
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260 }
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261
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262 @Override public Class<?> getDeclaringClass() {
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263 return cls.getDeclaringClass();
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264 }
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265
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266 @Override public String getName() {
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267 return cls.getName();
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268 }
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269
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270 @Override public int getModifiers() {
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271 return cls.getModifiers();
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272 }
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273
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274 @Override public boolean isSynthetic() {
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275 return cls.isSynthetic();
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276 }
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277 }
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278
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279 public static Static getClass(LuanState luan,String name) throws LuanException {
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280 Class cls;
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281 try {
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282 cls = Class.forName(name);
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283 } catch(ClassNotFoundException e) {
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284 try {
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285 cls = Thread.currentThread().getContextClassLoader().loadClass(name);
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286 } catch(ClassNotFoundException e2) {
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287 throw new LuanException(luan,LuanElement.JAVA,e);
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288 }
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289 }
51
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290 return new Static(cls);
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291 }
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292
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293 public static void importClass(LuanState luan,String name) throws LuanException {
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294 luan.global().put( name.substring(name.lastIndexOf('.')+1), getClass(luan,name) );
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295 }
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296
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297 static class AmbiguousJavaFunction extends LuanFunction {
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298 private final Map<Integer,List<LuanJavaFunction>> fnMap = new HashMap<Integer,List<LuanJavaFunction>>();
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299
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300 AmbiguousJavaFunction(List<LuanJavaFunction> fns) {
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301 for( LuanJavaFunction fn : fns ) {
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302 Integer n = fn.getParameterTypes().length;
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303 List<LuanJavaFunction> list = fnMap.get(n);
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304 if( list==null ) {
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305 list = new ArrayList<LuanJavaFunction>();
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306 fnMap.put(n,list);
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307 }
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308 list.add(fn);
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309 }
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310 }
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311
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312 @Override public Object[] call(LuanState luan,Object[] args) throws LuanException {
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313 for( LuanJavaFunction fn : fnMap.get(args.length) ) {
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314 try {
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315 return fn.rawCall(luan,args);
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316 } catch(IllegalArgumentException e) {}
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317 }
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318 throw new LuanException(luan,LuanElement.JAVA,"no method matched args");
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319 }
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320 }
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321
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322 private static class InstanceOf {
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323 private final Object obj;
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324
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325 InstanceOf(Object obj) {
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326 this.obj = obj;
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327 }
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328
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329 public boolean instanceOf(Static st) {
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330 return st.cls.isInstance(obj);
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331 }
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332 }
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333 private static final Method instanceOf;
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334 static {
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335 try {
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336 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class);
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337 instanceOf.setAccessible(true);
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338 } catch(NoSuchMethodException e) {
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339 throw new RuntimeException(e);
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340 }
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341 }
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342
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343 }