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annotate src/luan/lib/JavaLib.java @ 74:f003338d503b

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improve package lib git-svn-id: https://luan-java.googlecode.com/svn/trunk@75 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 13 Feb 2013 06:27:56 +0000
parents f86e4f77ef32
children 4bf3d0c0b6b9
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1 package luan.lib;
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2
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3 import java.lang.reflect.Array;
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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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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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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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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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30 public static final String NAME = "java";
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32 public static final LuanFunction LOADER = new LuanFunction() {
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33 public Object[] call(LuanState luan,Object[] args) throws LuanException {
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34 luan.addMetatableGetter(mg);
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35 LuanTable module = new LuanTable();
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36 LuanTable global = luan.global;
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37 try {
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38 global.put( "import", new LuanJavaFunction(JavaLib.class.getMethod("importClass",LuanState.class,String.class),null) );
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39 module.put( "class", new LuanJavaFunction(JavaLib.class.getMethod("getClass",LuanState.class,String.class),null) );
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40 add( module, "proxy", LuanState.class, Static.class, LuanTable.class, Object.class );
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41 } catch(NoSuchMethodException e) {
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42 throw new RuntimeException(e);
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43 }
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44 return new Object[]{module};
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45 }
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46 };
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48 private static final LuanTable mt = new LuanTable();
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49 static {
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50 add( mt, "__index", LuanState.class, Object.class, Object.class );
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51 add( mt, "__newindex", LuanState.class, Object.class, Object.class, Object.class );
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52 }
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53
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54 private static void add(LuanTable t,String method,Class<?>... parameterTypes) {
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55 try {
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56 t.put( method, new LuanJavaFunction(JavaLib.class.getMethod(method,parameterTypes),null) );
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57 } catch(NoSuchMethodException e) {
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58 throw new RuntimeException(e);
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59 }
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60 }
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62 private static final MetatableGetter mg = new MetatableGetter() {
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63 public LuanTable getMetatable(Object obj) {
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64 if( obj==null )
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65 return null;
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66 return mt;
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67 }
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68 };
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69
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70 public static Object __index(LuanState luan,Object obj,Object key) throws LuanException {
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71 if( obj instanceof Static ) {
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72 if( key instanceof String ) {
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73 String name = (String)key;
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74 Static st = (Static)obj;
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75 Class cls = st.cls;
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76 if( "class".equals(name) ) {
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77 return cls;
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78 } else if( "new".equals(name) ) {
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79 Constructor<?>[] constructors = cls.getConstructors();
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80 if( constructors.length > 0 ) {
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81 if( constructors.length==1 ) {
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82 return new LuanJavaFunction(constructors[0],null);
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83 } else {
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84 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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85 for( Constructor constructor : constructors ) {
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86 fns.add(new LuanJavaFunction(constructor,null));
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87 }
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88 return new AmbiguousJavaFunction(fns);
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89 }
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90 }
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91 } else if( "assert".equals(name) ) {
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92 return new LuanJavaFunction(assertClass,new AssertClass(cls));
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93 } else {
56
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94 List<Member> members = getStaticMembers(cls,name);
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95 if( !members.isEmpty() ) {
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96 return member(null,members);
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97 }
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98 }
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99 }
56
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100 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for: "+obj);
37
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101 }
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102 Class cls = obj.getClass();
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103 if( cls.isArray() ) {
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104 if( "length".equals(key) ) {
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105 return Array.getLength(obj);
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106 }
48
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107 Integer i = Luan.asInteger(key);
46
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108 if( i != null ) {
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109 return Array.get(obj,i);
37
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110 }
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111 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java array: "+obj);
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112 }
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113 if( key instanceof String ) {
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114 String name = (String)key;
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115 if( "instanceof".equals(name) ) {
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116 return new LuanJavaFunction(instanceOf,new InstanceOf(obj));
37
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117 } else {
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118 List<Member> members = getMembers(cls,name);
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119 if( !members.isEmpty() ) {
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120 return member(obj,members);
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121 }
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122 }
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123 }
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124 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java object: "+obj);
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125 }
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126
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127 private static Object member(Object obj,List<Member> members) throws LuanException {
37
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128 try {
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129 if( members.size()==1 ) {
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130 Member member = members.get(0);
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131 if( member instanceof Static ) {
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132 return member;
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133 } else if( member instanceof Field ) {
37
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134 Field field = (Field)member;
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135 return field.get(obj);
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136 } else {
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137 Method method = (Method)member;
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diff changeset
138 return new LuanJavaFunction(method,obj);
37
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139 }
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140 } else {
48
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diff changeset
141 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
56
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diff changeset
142 for( Member member : members ) {
37
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diff changeset
143 Method method = (Method)member;
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144 fns.add(new LuanJavaFunction(method,obj));
37
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145 }
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146 return new AmbiguousJavaFunction(fns);
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147 }
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148 } catch(IllegalAccessException e) {
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149 throw new RuntimeException(e);
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150 }
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151 }
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152
60
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153 public static void __newindex(LuanState luan,Object obj,Object key,Object value) throws LuanException {
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diff changeset
154 if( obj instanceof Static ) {
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diff changeset
155 if( key instanceof String ) {
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156 String name = (String)key;
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diff changeset
157 Static st = (Static)obj;
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diff changeset
158 Class cls = st.cls;
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159 List<Member> members = getStaticMembers(cls,name);
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diff changeset
160 if( !members.isEmpty() ) {
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diff changeset
161 if( members.size() != 1 )
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162 throw new RuntimeException("not field '"+name+"' of "+obj);
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diff changeset
163 setMember(obj,members,value);
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164 return;
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165 }
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166 }
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diff changeset
167 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for: "+obj);
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diff changeset
168 }
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diff changeset
169 Class cls = obj.getClass();
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diff changeset
170 if( cls.isArray() ) {
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diff changeset
171 Integer i = Luan.asInteger(key);
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diff changeset
172 if( i != null ) {
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diff changeset
173 Array.set(obj,i,value);
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diff changeset
174 return;
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diff changeset
175 }
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diff changeset
176 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java array: "+obj);
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177 }
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diff changeset
178 if( key instanceof String ) {
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diff changeset
179 String name = (String)key;
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180 List<Member> members = getMembers(cls,name);
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diff changeset
181 if( !members.isEmpty() ) {
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diff changeset
182 if( members.size() != 1 )
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diff changeset
183 throw new RuntimeException("not field '"+name+"' of "+obj);
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diff changeset
184 setMember(obj,members,value);
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diff changeset
185 return;
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diff changeset
186 }
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diff changeset
187 }
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diff changeset
188 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java object: "+obj);
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diff changeset
189 }
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diff changeset
190
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diff changeset
191 private static void setMember(Object obj,List<Member> members,Object value) {
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diff changeset
192 Field field = (Field)members.get(0);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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diff changeset
193 try {
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diff changeset
194 field.set(obj,value);
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diff changeset
195 } catch(IllegalAccessException e) {
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diff changeset
196 throw new RuntimeException(e);
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diff changeset
197 }
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diff changeset
198 }
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diff changeset
199
56
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diff changeset
200 private static Map<Class,Map<String,List<Member>>> memberMap = new HashMap<Class,Map<String,List<Member>>>();
37
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201
56
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diff changeset
202 private static synchronized List<Member> getMembers(Class cls,String name) {
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203 Map<String,List<Member>> clsMap = memberMap.get(cls);
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204 if( clsMap == null ) {
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205 clsMap = new HashMap<String,List<Member>>();
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206 for( Class c : cls.getClasses() ) {
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207 String s = c.getSimpleName();
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208 List<Member> list = new ArrayList<Member>();
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209 clsMap.put(s,list);
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210 list.add(new Static(c));
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211 }
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212 for( Field field : cls.getFields() ) {
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213 String s = field.getName();
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214 try {
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215 if( !cls.getField(s).equals(field) )
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216 continue; // not accessible
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217 } catch(NoSuchFieldException e) {
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218 throw new RuntimeException(e);
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219 }
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220 List<Member> list = new ArrayList<Member>();
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221 clsMap.put(s,list);
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222 list = new ArrayList<Member>();
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223 clsMap.put(s,list);
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224 list.add(field);
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225 }
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226 for( Method method : cls.getMethods() ) {
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227 String s = method.getName();
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228 List<Member> list = clsMap.get(s);
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229 if( list == null || !(list.get(0) instanceof Method) ) {
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230 list = new ArrayList<Member>();
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231 clsMap.put(s,list);
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232 }
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233 list.add(method);
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234 }
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235 for( List<Member> members : clsMap.values() ) {
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236 for( Member m : members ) {
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237 if( m instanceof AccessibleObject )
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238 ((AccessibleObject)m).setAccessible(true);
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239 }
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240 }
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241 memberMap.put(cls,clsMap);
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242 }
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243 List<Member> rtn = clsMap.get(name);
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244 if( rtn==null )
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245 rtn = Collections.emptyList();
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246 return rtn;
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247 }
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248
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249 private static synchronized List<Member> getStaticMembers(Class cls,String name) {
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250 List<Member> staticMembers = new ArrayList<Member>();
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251 for( Member m : getMembers(cls,name) ) {
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252 if( Modifier.isStatic(m.getModifiers()) )
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253 staticMembers.add(m);
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254 }
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255 return staticMembers;
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256 }
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257
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258 static final class Static implements Member {
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259 final Class cls;
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260
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261 Static(Class cls) {
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262 this.cls = cls;
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263 }
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264
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265 @Override public String toString() {
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266 return cls.toString();
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267 }
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268
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269 @Override public Class<?> getDeclaringClass() {
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270 return cls.getDeclaringClass();
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271 }
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272
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273 @Override public String getName() {
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274 return cls.getName();
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275 }
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276
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277 @Override public int getModifiers() {
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278 return cls.getModifiers();
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279 }
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280
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281 @Override public boolean isSynthetic() {
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282 return cls.isSynthetic();
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283 }
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284 }
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285
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286 public static Static getClass(LuanState luan,String name) throws LuanException {
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287 Class cls;
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288 try {
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289 cls = Class.forName(name);
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290 } catch(ClassNotFoundException e) {
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291 try {
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292 cls = Thread.currentThread().getContextClassLoader().loadClass(name);
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293 } catch(ClassNotFoundException e2) {
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294 throw new LuanException(luan,LuanElement.JAVA,e);
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295 }
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296 }
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297 return new Static(cls);
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298 }
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299
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300 public static void importClass(LuanState luan,String name) throws LuanException {
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301 luan.global.put( name.substring(name.lastIndexOf('.')+1), getClass(luan,name) );
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302 }
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303
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304 static class AmbiguousJavaFunction extends LuanFunction {
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305 private final Map<Integer,List<LuanJavaFunction>> fnMap = new HashMap<Integer,List<LuanJavaFunction>>();
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306
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307 AmbiguousJavaFunction(List<LuanJavaFunction> fns) {
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308 for( LuanJavaFunction fn : fns ) {
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309 Integer n = fn.getParameterTypes().length;
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310 List<LuanJavaFunction> list = fnMap.get(n);
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311 if( list==null ) {
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312 list = new ArrayList<LuanJavaFunction>();
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313 fnMap.put(n,list);
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314 }
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315 list.add(fn);
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316 }
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317 }
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318
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319 @Override public Object[] call(LuanState luan,Object[] args) throws LuanException {
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320 for( LuanJavaFunction fn : fnMap.get(args.length) ) {
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321 try {
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322 return fn.rawCall(luan,args);
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323 } catch(IllegalArgumentException e) {}
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324 }
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325 throw new LuanException(luan,LuanElement.JAVA,"no method matched args");
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326 }
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327 }
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328
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329 private static class InstanceOf {
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330 private final Object obj;
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331
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332 InstanceOf(Object obj) {
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333 this.obj = obj;
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334 }
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335
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336 public boolean instanceOf(Static st) {
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337 return st.cls.isInstance(obj);
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338 }
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339 }
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340 private static final Method instanceOf;
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341 static {
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342 try {
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343 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class);
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344 instanceOf.setAccessible(true);
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345 } catch(NoSuchMethodException e) {
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346 throw new RuntimeException(e);
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347 }
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348 }
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349
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350
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351 private static class AssertClass {
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352 private final Class cls;
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353
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354 AssertClass(Class cls) {
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355 this.cls = cls;
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356 }
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357
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358 public Object assertClass(LuanState luan,Object v) throws LuanException {
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359 if( !cls.isInstance(v) ) {
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360 String got = v.getClass().getSimpleName();
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361 String expected = cls.getSimpleName();
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362 throw new LuanException(luan,LuanElement.JAVA,"bad argument #1 ("+expected+" expected, got "+got+")");
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363 }
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364 return v;
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365 }
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366 }
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367 private static final Method assertClass;
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368 static {
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369 try {
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370 assertClass = AssertClass.class.getMethod("assertClass",LuanState.class,Object.class);
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371 assertClass.setAccessible(true);
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372 } catch(NoSuchMethodException e) {
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373 throw new RuntimeException(e);
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374 }
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375 }
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376
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377
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378 public static Object proxy(final LuanState luan,Static st,final LuanTable t,final Object base) throws LuanException {
61
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379 return Proxy.newProxyInstance(
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380 st.cls.getClassLoader(),
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381 new Class[]{st.cls},
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382 new InvocationHandler() {
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383 public Object invoke(Object proxy,Method method, Object[] args)
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384 throws Throwable
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385 {
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386 if( args==null )
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387 args = new Object[0];
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388 String name = method.getName();
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389 Object fnObj = t.get(name);
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390 if( fnObj==null && base!=null )
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391 return method.invoke(base,args);
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392 LuanFunction fn = luan.checkFunction(LuanElement.JAVA,fnObj);
61
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393 return Luan.first(luan.call(fn,LuanElement.JAVA,name,args));
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394 }
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395 }
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396 );
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397 }
37
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398 }