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annotate src/luan/lib/JavaLib.java @ 63:ebe578282363

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minor fix git-svn-id: https://luan-java.googlecode.com/svn/trunk@64 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 09 Jan 2013 22:54:50 +0000
parents 7c05f53ef6cb
children 177cfdc2bdb3
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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.lang.reflect.InvocationHandler;
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11 import java.lang.reflect.Proxy;
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12 import java.util.Map;
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13 import java.util.HashMap;
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14 import java.util.List;
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15 import java.util.ArrayList;
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16 import java.util.Iterator;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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17 import java.util.Collections;
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18 import luan.Luan;
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19 import luan.LuanState;
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20 import luan.LuanTable;
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21 import luan.MetatableGetter;
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22 import luan.LuanException;
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23 import luan.LuanFunction;
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24 import luan.LuanJavaFunction;
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25 import luan.LuanElement;
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28 public final class JavaLib {
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29
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30 public static void register(LuanState luan) {
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31 luan.addMetatableGetter(mg);
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32 LuanTable module = new LuanTable();
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33 LuanTable global = luan.global();
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34 global.put("java",module);
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35 try {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 46
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36 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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37 module.put( "class", new LuanJavaFunction(JavaLib.class.getMethod("getClass",LuanState.class,String.class),null) );
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7c05f53ef6cb improve java.proxy
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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38 add( module, "proxy", LuanState.class, Static.class, LuanTable.class, Object.class );
37
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39 } catch(NoSuchMethodException e) {
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40 throw new RuntimeException(e);
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41 }
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42 }
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43
48
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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44 private static final LuanTable mt = new LuanTable();
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45 static {
48
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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46 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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47 add( mt, "__newindex", LuanState.class, Object.class, Object.class, Object.class );
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48 }
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49
48
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50 private static void add(LuanTable t,String method,Class<?>... parameterTypes) {
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51 try {
48
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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52 t.put( method, new LuanJavaFunction(JavaLib.class.getMethod(method,parameterTypes),null) );
37
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53 } catch(NoSuchMethodException e) {
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54 throw new RuntimeException(e);
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55 }
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56 }
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57
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58 private static final MetatableGetter mg = new MetatableGetter() {
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59 public LuanTable getMetatable(Object obj) {
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60 if( obj==null )
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61 return null;
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62 return mt;
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63 }
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64 };
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65
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66 public static Object __index(LuanState luan,Object obj,Object key) throws LuanException {
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67 if( obj instanceof Static ) {
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68 if( key instanceof String ) {
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69 String name = (String)key;
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70 Static st = (Static)obj;
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71 Class cls = st.cls;
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72 if( "class".equals(name) ) {
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73 return cls;
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74 } else if( "new".equals(name) ) {
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75 Constructor<?>[] constructors = cls.getConstructors();
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76 if( constructors.length > 0 ) {
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77 if( constructors.length==1 ) {
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78 return new LuanJavaFunction(constructors[0],null);
37
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79 } else {
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80 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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81 for( Constructor constructor : constructors ) {
48
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82 fns.add(new LuanJavaFunction(constructor,null));
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83 }
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84 return new AmbiguousJavaFunction(fns);
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85 }
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86 }
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87 } else {
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88 List<Member> members = getStaticMembers(cls,name);
37
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89 if( !members.isEmpty() ) {
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90 return member(null,members);
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91 }
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92 }
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93 }
56
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94 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for: "+obj);
37
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95 }
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96 Class cls = obj.getClass();
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97 if( cls.isArray() ) {
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98 if( "length".equals(key) ) {
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99 return Array.getLength(obj);
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100 }
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101 Integer i = Luan.asInteger(key);
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102 if( i != null ) {
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103 return Array.get(obj,i);
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104 }
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105 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java array: "+obj);
37
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106 }
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107 if( key instanceof String ) {
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108 String name = (String)key;
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109 if( "instanceof".equals(name) ) {
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110 return new LuanJavaFunction(instanceOf,new InstanceOf(obj));
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111 } else {
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112 List<Member> members = getMembers(cls,name);
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113 if( !members.isEmpty() ) {
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114 return member(obj,members);
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115 }
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116 }
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117 }
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118 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java object: "+obj);
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119 }
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120
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121 private static Object member(Object obj,List<Member> members) throws LuanException {
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122 try {
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123 for( Member m : members ) {
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124 if( m instanceof AccessibleObject )
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125 ((AccessibleObject)m).setAccessible(true);
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126 }
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127 if( members.size()==1 ) {
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128 Member member = members.get(0);
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129 if( member instanceof Static ) {
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130 return member;
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131 } else if( member instanceof Field ) {
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132 Field field = (Field)member;
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133 return field.get(obj);
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134 } else {
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135 Method method = (Method)member;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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136 return new LuanJavaFunction(method,obj);
37
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137 }
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138 } else {
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diff changeset
139 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
56
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diff changeset
140 for( Member member : members ) {
37
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141 Method method = (Method)member;
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142 fns.add(new LuanJavaFunction(method,obj));
37
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143 }
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144 return new AmbiguousJavaFunction(fns);
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145 }
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146 } catch(IllegalAccessException e) {
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147 throw new RuntimeException(e);
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148 }
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149 }
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150
60
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151 public static void __newindex(LuanState luan,Object obj,Object key,Object value) throws LuanException {
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152 if( obj instanceof Static ) {
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153 if( key instanceof String ) {
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154 String name = (String)key;
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diff changeset
155 Static st = (Static)obj;
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156 Class cls = st.cls;
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157 List<Member> members = getStaticMembers(cls,name);
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158 if( !members.isEmpty() ) {
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159 if( members.size() != 1 )
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diff changeset
160 throw new RuntimeException("not field '"+name+"' of "+obj);
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diff changeset
161 setMember(obj,members,value);
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162 return;
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163 }
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164 }
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diff changeset
165 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for: "+obj);
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166 }
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diff changeset
167 Class cls = obj.getClass();
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diff changeset
168 if( cls.isArray() ) {
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diff changeset
169 Integer i = Luan.asInteger(key);
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diff changeset
170 if( i != null ) {
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diff changeset
171 Array.set(obj,i,value);
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172 return;
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173 }
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diff changeset
174 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java array: "+obj);
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diff changeset
175 }
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diff changeset
176 if( key instanceof String ) {
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diff changeset
177 String name = (String)key;
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178 List<Member> members = getMembers(cls,name);
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diff changeset
179 if( !members.isEmpty() ) {
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180 if( members.size() != 1 )
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181 throw new RuntimeException("not field '"+name+"' of "+obj);
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diff changeset
182 setMember(obj,members,value);
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diff changeset
183 return;
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184 }
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185 }
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diff changeset
186 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java object: "+obj);
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187 }
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diff changeset
188
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diff changeset
189 private static void setMember(Object obj,List<Member> members,Object value) {
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diff changeset
190 Field field = (Field)members.get(0);
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diff changeset
191 try {
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diff changeset
192 field.set(obj,value);
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diff changeset
193 } catch(IllegalAccessException e) {
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diff changeset
194 throw new RuntimeException(e);
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diff changeset
195 }
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diff changeset
196 }
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diff changeset
197
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diff changeset
198 private static Map<Class,Map<String,List<Member>>> memberMap = new HashMap<Class,Map<String,List<Member>>>();
37
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199
56
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diff changeset
200 private static synchronized List<Member> getMembers(Class cls,String name) {
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diff changeset
201 Map<String,List<Member>> clsMap = memberMap.get(cls);
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diff changeset
202 if( clsMap == null ) {
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203 clsMap = new HashMap<String,List<Member>>();
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204 for( Method method : cls.getMethods() ) {
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205 String s = method.getName();
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206 List<Member> list = clsMap.get(s);
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207 if( list == null ) {
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208 list = new ArrayList<Member>();
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209 clsMap.put(s,list);
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210 }
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211 list.add(method);
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212 }
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213 for( Class c : cls.getClasses() ) {
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214 String s = c.getSimpleName();
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215 List<Member> list = clsMap.get(s);
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216 if( list == null ) {
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217 list = new ArrayList<Member>();
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218 clsMap.put(s,list);
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219 }
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220 list.add(new Static(c));
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221 }
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222 for( Field field : cls.getFields() ) {
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223 String s = field.getName();
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224 try {
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225 if( !cls.getField(s).equals(field) )
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226 continue; // not accessible
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227 } catch(NoSuchFieldException e) {
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228 throw new RuntimeException(e);
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229 }
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230 List<Member> list = clsMap.get(s);
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231 if( list != null )
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232 throw new RuntimeException("can't add field '"+s+"' to "+cls+" because these are already defined: "+list);
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233 list = new ArrayList<Member>();
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234 clsMap.put(s,list);
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235 list.add(field);
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236 }
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237 memberMap.put(cls,clsMap);
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238 }
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239 List<Member> rtn = clsMap.get(name);
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240 if( rtn==null )
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241 rtn = Collections.emptyList();
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242 return rtn;
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243 }
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244
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245 private static synchronized List<Member> getStaticMembers(Class cls,String name) {
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246 List<Member> staticMembers = new ArrayList<Member>();
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247 for( Member m : getMembers(cls,name) ) {
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248 if( Modifier.isStatic(m.getModifiers()) )
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249 staticMembers.add(m);
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250 }
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251 return staticMembers;
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252 }
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253
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254 static final class Static implements Member {
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255 final Class cls;
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256
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257 Static(Class cls) {
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258 this.cls = cls;
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259 }
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260
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261 @Override public String toString() {
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262 return cls.toString();
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263 }
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264
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265 @Override public Class<?> getDeclaringClass() {
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266 return cls.getDeclaringClass();
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267 }
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268
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269 @Override public String getName() {
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270 return cls.getName();
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271 }
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272
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273 @Override public int getModifiers() {
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274 return cls.getModifiers();
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275 }
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276
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277 @Override public boolean isSynthetic() {
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278 return cls.isSynthetic();
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279 }
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280 }
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281
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282 public static Static getClass(LuanState luan,String name) throws LuanException {
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283 Class cls;
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284 try {
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285 cls = Class.forName(name);
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286 } catch(ClassNotFoundException e) {
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287 try {
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288 cls = Thread.currentThread().getContextClassLoader().loadClass(name);
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289 } catch(ClassNotFoundException e2) {
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290 throw new LuanException(luan,LuanElement.JAVA,e);
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291 }
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292 }
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293 return new Static(cls);
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294 }
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295
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296 public static void importClass(LuanState luan,String name) throws LuanException {
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297 luan.global().put( name.substring(name.lastIndexOf('.')+1), getClass(luan,name) );
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298 }
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299
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300 static class AmbiguousJavaFunction extends LuanFunction {
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301 private final Map<Integer,List<LuanJavaFunction>> fnMap = new HashMap<Integer,List<LuanJavaFunction>>();
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302
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303 AmbiguousJavaFunction(List<LuanJavaFunction> fns) {
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304 for( LuanJavaFunction fn : fns ) {
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305 Integer n = fn.getParameterTypes().length;
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306 List<LuanJavaFunction> list = fnMap.get(n);
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307 if( list==null ) {
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308 list = new ArrayList<LuanJavaFunction>();
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309 fnMap.put(n,list);
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310 }
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311 list.add(fn);
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312 }
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313 }
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314
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315 @Override public Object[] call(LuanState luan,Object[] args) throws LuanException {
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316 for( LuanJavaFunction fn : fnMap.get(args.length) ) {
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317 try {
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318 return fn.rawCall(luan,args);
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319 } catch(IllegalArgumentException e) {}
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320 }
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321 throw new LuanException(luan,LuanElement.JAVA,"no method matched args");
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322 }
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323 }
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324
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325 private static class InstanceOf {
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326 private final Object obj;
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327
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328 InstanceOf(Object obj) {
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329 this.obj = obj;
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330 }
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331
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332 public boolean instanceOf(Static st) {
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333 return st.cls.isInstance(obj);
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334 }
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335 }
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336 private static final Method instanceOf;
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337 static {
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338 try {
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339 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class);
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340 instanceOf.setAccessible(true);
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341 } catch(NoSuchMethodException e) {
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342 throw new RuntimeException(e);
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343 }
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344 }
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345
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346
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347 public static Object proxy(final LuanState luan,Static st,final LuanTable t,final Object base) throws LuanException {
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348 return Proxy.newProxyInstance(
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349 st.cls.getClassLoader(),
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350 new Class[]{st.cls},
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351 new InvocationHandler() {
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352 public Object invoke(Object proxy,Method method, Object[] args)
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353 throws Throwable
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354 {
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355 if( args==null )
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356 args = new Object[0];
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357 String name = method.getName();
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358 Object fnObj = t.get(name);
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359 if( fnObj==null && base!=null )
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360 return method.invoke(base,args);
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361 LuanFunction fn = luan.checkFunction(LuanElement.JAVA,fnObj);
61
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362 return Luan.first(luan.call(fn,LuanElement.JAVA,name,args));
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363 }
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364 }
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365 );
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366 }
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367 }