Mercurial Hosting > luan
annotate src/luan/lib/JavaLib.java @ 73:f86e4f77ef32
add package module
git-svn-id: https://luan-java.googlecode.com/svn/trunk@74 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Tue, 12 Feb 2013 09:46:45 +0000 |
parents | 5a93129995e1 |
children | f003338d503b |
rev | line source |
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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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24 import luan.LuanJavaFunction; |
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25 import luan.LuanElement; |
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26 |
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27 |
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28 public final class JavaLib { |
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29 |
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30 public static final String NAME = "java"; |
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31 |
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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 global.put(NAME,module); |
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38 try { |
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39 global.put( "import", new LuanJavaFunction(JavaLib.class.getMethod("importClass",LuanState.class,String.class),null) ); |
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40 module.put( "class", new LuanJavaFunction(JavaLib.class.getMethod("getClass",LuanState.class,String.class),null) ); |
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41 add( module, "proxy", LuanState.class, Static.class, LuanTable.class, Object.class ); |
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42 } catch(NoSuchMethodException e) { |
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43 throw new RuntimeException(e); |
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44 } |
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45 return LuanFunction.EMPTY_RTN; |
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46 } |
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47 }; |
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48 |
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49 private static final LuanTable mt = new LuanTable(); |
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50 static { |
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51 add( mt, "__index", LuanState.class, Object.class, Object.class ); |
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52 add( mt, "__newindex", LuanState.class, Object.class, Object.class, Object.class ); |
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53 } |
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54 |
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55 private static void add(LuanTable t,String method,Class<?>... parameterTypes) { |
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56 try { |
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57 t.put( method, new LuanJavaFunction(JavaLib.class.getMethod(method,parameterTypes),null) ); |
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58 } catch(NoSuchMethodException e) { |
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59 throw new RuntimeException(e); |
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60 } |
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61 } |
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62 |
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63 private static final MetatableGetter mg = new MetatableGetter() { |
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64 public LuanTable getMetatable(Object obj) { |
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65 if( obj==null ) |
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66 return null; |
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67 return mt; |
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68 } |
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69 }; |
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70 |
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71 public static Object __index(LuanState luan,Object obj,Object key) throws LuanException { |
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72 if( obj instanceof Static ) { |
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73 if( key instanceof String ) { |
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74 String name = (String)key; |
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75 Static st = (Static)obj; |
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76 Class cls = st.cls; |
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77 if( "class".equals(name) ) { |
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78 return cls; |
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79 } else if( "new".equals(name) ) { |
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80 Constructor<?>[] constructors = cls.getConstructors(); |
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81 if( constructors.length > 0 ) { |
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82 if( constructors.length==1 ) { |
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83 return new LuanJavaFunction(constructors[0],null); |
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84 } else { |
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85 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>(); |
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86 for( Constructor constructor : constructors ) { |
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87 fns.add(new LuanJavaFunction(constructor,null)); |
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88 } |
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89 return new AmbiguousJavaFunction(fns); |
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90 } |
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91 } |
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92 } else if( "assert".equals(name) ) { |
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93 return new LuanJavaFunction(assertClass,new AssertClass(cls)); |
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94 } else { |
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95 List<Member> members = getStaticMembers(cls,name); |
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96 if( !members.isEmpty() ) { |
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97 return member(null,members); |
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98 } |
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99 } |
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100 } |
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101 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for: "+obj); |
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102 } |
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103 Class cls = obj.getClass(); |
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104 if( cls.isArray() ) { |
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105 if( "length".equals(key) ) { |
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106 return Array.getLength(obj); |
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107 } |
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108 Integer i = Luan.asInteger(key); |
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109 if( i != null ) { |
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110 return Array.get(obj,i); |
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111 } |
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112 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java array: "+obj); |
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113 } |
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114 if( key instanceof String ) { |
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115 String name = (String)key; |
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116 if( "instanceof".equals(name) ) { |
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117 return new LuanJavaFunction(instanceOf,new InstanceOf(obj)); |
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118 } else { |
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119 List<Member> members = getMembers(cls,name); |
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120 if( !members.isEmpty() ) { |
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121 return member(obj,members); |
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122 } |
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123 } |
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124 } |
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125 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java object: "+obj); |
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126 } |
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127 |
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128 private static Object member(Object obj,List<Member> members) throws LuanException { |
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129 try { |
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130 if( members.size()==1 ) { |
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131 Member member = members.get(0); |
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132 if( member instanceof Static ) { |
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133 return member; |
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134 } else if( member instanceof Field ) { |
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135 Field field = (Field)member; |
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136 return field.get(obj); |
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137 } else { |
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138 Method method = (Method)member; |
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139 return new LuanJavaFunction(method,obj); |
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140 } |
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141 } else { |
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142 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>(); |
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143 for( Member member : members ) { |
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144 Method method = (Method)member; |
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145 fns.add(new LuanJavaFunction(method,obj)); |
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146 } |
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147 return new AmbiguousJavaFunction(fns); |
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148 } |
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149 } catch(IllegalAccessException e) { |
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150 throw new RuntimeException(e); |
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151 } |
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152 } |
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153 |
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154 public static void __newindex(LuanState luan,Object obj,Object key,Object value) throws LuanException { |
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155 if( obj instanceof Static ) { |
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156 if( key instanceof String ) { |
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157 String name = (String)key; |
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158 Static st = (Static)obj; |
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159 Class cls = st.cls; |
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160 List<Member> members = getStaticMembers(cls,name); |
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161 if( !members.isEmpty() ) { |
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162 if( members.size() != 1 ) |
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163 throw new RuntimeException("not field '"+name+"' of "+obj); |
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164 setMember(obj,members,value); |
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165 return; |
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166 } |
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167 } |
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168 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for: "+obj); |
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169 } |
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170 Class cls = obj.getClass(); |
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171 if( cls.isArray() ) { |
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172 Integer i = Luan.asInteger(key); |
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173 if( i != null ) { |
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174 Array.set(obj,i,value); |
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175 return; |
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176 } |
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177 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java array: "+obj); |
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178 } |
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179 if( key instanceof String ) { |
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180 String name = (String)key; |
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181 List<Member> members = getMembers(cls,name); |
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182 if( !members.isEmpty() ) { |
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183 if( members.size() != 1 ) |
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184 throw new RuntimeException("not field '"+name+"' of "+obj); |
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185 setMember(obj,members,value); |
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186 return; |
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187 } |
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188 } |
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189 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java object: "+obj); |
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190 } |
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191 |
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192 private static void setMember(Object obj,List<Member> members,Object value) { |
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193 Field field = (Field)members.get(0); |
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194 try { |
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195 field.set(obj,value); |
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196 } catch(IllegalAccessException e) { |
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197 throw new RuntimeException(e); |
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198 } |
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199 } |
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200 |
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201 private static Map<Class,Map<String,List<Member>>> memberMap = new HashMap<Class,Map<String,List<Member>>>(); |
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202 |
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203 private static synchronized List<Member> getMembers(Class cls,String name) { |
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204 Map<String,List<Member>> clsMap = memberMap.get(cls); |
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205 if( clsMap == null ) { |
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206 clsMap = new HashMap<String,List<Member>>(); |
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207 for( Class c : cls.getClasses() ) { |
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208 String s = c.getSimpleName(); |
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209 List<Member> list = new ArrayList<Member>(); |
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210 clsMap.put(s,list); |
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211 list.add(new Static(c)); |
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212 } |
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213 for( Field field : cls.getFields() ) { |
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214 String s = field.getName(); |
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215 try { |
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216 if( !cls.getField(s).equals(field) ) |
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217 continue; // not accessible |
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218 } catch(NoSuchFieldException e) { |
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219 throw new RuntimeException(e); |
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220 } |
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221 List<Member> list = new ArrayList<Member>(); |
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222 clsMap.put(s,list); |
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223 list = new ArrayList<Member>(); |
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224 clsMap.put(s,list); |
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225 list.add(field); |
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226 } |
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227 for( Method method : cls.getMethods() ) { |
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228 String s = method.getName(); |
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229 List<Member> list = clsMap.get(s); |
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230 if( list == null || !(list.get(0) instanceof Method) ) { |
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231 list = new ArrayList<Member>(); |
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232 clsMap.put(s,list); |
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233 } |
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234 list.add(method); |
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235 } |
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236 for( List<Member> members : clsMap.values() ) { |
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237 for( Member m : members ) { |
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238 if( m instanceof AccessibleObject ) |
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239 ((AccessibleObject)m).setAccessible(true); |
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240 } |
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241 } |
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242 memberMap.put(cls,clsMap); |
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243 } |
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244 List<Member> rtn = clsMap.get(name); |
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245 if( rtn==null ) |
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246 rtn = Collections.emptyList(); |
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247 return rtn; |
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248 } |
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249 |
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250 private static synchronized List<Member> getStaticMembers(Class cls,String name) { |
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251 List<Member> staticMembers = new ArrayList<Member>(); |
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252 for( Member m : getMembers(cls,name) ) { |
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253 if( Modifier.isStatic(m.getModifiers()) ) |
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254 staticMembers.add(m); |
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255 } |
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256 return staticMembers; |
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257 } |
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258 |
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259 static final class Static implements Member { |
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260 final Class cls; |
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261 |
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262 Static(Class cls) { |
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263 this.cls = cls; |
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264 } |
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265 |
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266 @Override public String toString() { |
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267 return cls.toString(); |
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268 } |
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269 |
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270 @Override public Class<?> getDeclaringClass() { |
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271 return cls.getDeclaringClass(); |
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272 } |
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273 |
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274 @Override public String getName() { |
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275 return cls.getName(); |
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276 } |
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277 |
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278 @Override public int getModifiers() { |
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279 return cls.getModifiers(); |
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280 } |
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281 |
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282 @Override public boolean isSynthetic() { |
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283 return cls.isSynthetic(); |
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284 } |
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285 } |
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286 |
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287 public static Static getClass(LuanState luan,String name) throws LuanException { |
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288 Class cls; |
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289 try { |
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290 cls = Class.forName(name); |
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291 } catch(ClassNotFoundException e) { |
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292 try { |
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293 cls = Thread.currentThread().getContextClassLoader().loadClass(name); |
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294 } catch(ClassNotFoundException e2) { |
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295 throw new LuanException(luan,LuanElement.JAVA,e); |
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296 } |
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297 } |
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298 return new Static(cls); |
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299 } |
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300 |
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301 public static void importClass(LuanState luan,String name) throws LuanException { |
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302 luan.global.put( name.substring(name.lastIndexOf('.')+1), getClass(luan,name) ); |
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303 } |
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304 |
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305 static class AmbiguousJavaFunction extends LuanFunction { |
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306 private final Map<Integer,List<LuanJavaFunction>> fnMap = new HashMap<Integer,List<LuanJavaFunction>>(); |
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307 |
48
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308 AmbiguousJavaFunction(List<LuanJavaFunction> fns) { |
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309 for( LuanJavaFunction fn : fns ) { |
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310 Integer n = fn.getParameterTypes().length; |
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311 List<LuanJavaFunction> list = fnMap.get(n); |
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312 if( list==null ) { |
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313 list = new ArrayList<LuanJavaFunction>(); |
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314 fnMap.put(n,list); |
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315 } |
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316 list.add(fn); |
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317 } |
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318 } |
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319 |
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320 @Override public Object[] call(LuanState luan,Object[] args) throws LuanException { |
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321 for( LuanJavaFunction fn : fnMap.get(args.length) ) { |
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322 try { |
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323 return fn.rawCall(luan,args); |
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324 } catch(IllegalArgumentException e) {} |
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325 } |
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326 throw new LuanException(luan,LuanElement.JAVA,"no method matched args"); |
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327 } |
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328 } |
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329 |
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330 private static class InstanceOf { |
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331 private final Object obj; |
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332 |
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333 InstanceOf(Object obj) { |
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334 this.obj = obj; |
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335 } |
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336 |
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337 public boolean instanceOf(Static st) { |
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338 return st.cls.isInstance(obj); |
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339 } |
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340 } |
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341 private static final Method instanceOf; |
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342 static { |
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343 try { |
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344 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class); |
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345 instanceOf.setAccessible(true); |
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346 } catch(NoSuchMethodException e) { |
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347 throw new RuntimeException(e); |
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348 } |
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349 } |
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350 |
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351 |
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352 private static class AssertClass { |
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353 private final Class cls; |
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354 |
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355 AssertClass(Class cls) { |
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356 this.cls = cls; |
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357 } |
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358 |
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359 public Object assertClass(LuanState luan,Object v) throws LuanException { |
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360 if( !cls.isInstance(v) ) { |
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361 String got = v.getClass().getSimpleName(); |
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362 String expected = cls.getSimpleName(); |
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363 throw new LuanException(luan,LuanElement.JAVA,"bad argument #1 ("+expected+" expected, got "+got+")"); |
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364 } |
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365 return v; |
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366 } |
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367 } |
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368 private static final Method assertClass; |
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369 static { |
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370 try { |
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371 assertClass = AssertClass.class.getMethod("assertClass",LuanState.class,Object.class); |
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372 assertClass.setAccessible(true); |
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373 } catch(NoSuchMethodException e) { |
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374 throw new RuntimeException(e); |
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375 } |
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376 } |
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377 |
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378 |
62
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379 public static Object proxy(final LuanState luan,Static st,final LuanTable t,final Object base) throws LuanException { |
61
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380 return Proxy.newProxyInstance( |
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381 st.cls.getClassLoader(), |
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382 new Class[]{st.cls}, |
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383 new InvocationHandler() { |
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384 public Object invoke(Object proxy,Method method, Object[] args) |
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385 throws Throwable |
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386 { |
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387 if( args==null ) |
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388 args = new Object[0]; |
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389 String name = method.getName(); |
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390 Object fnObj = t.get(name); |
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391 if( fnObj==null && base!=null ) |
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392 return method.invoke(base,args); |
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393 LuanFunction fn = luan.checkFunction(LuanElement.JAVA,fnObj); |
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394 return Luan.first(luan.call(fn,LuanElement.JAVA,name,args)); |
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395 } |
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396 } |
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397 ); |
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398 } |
37
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399 } |