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annotate core/src/luan/modules/JavaLuan.java @ 300:9fb523472035

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add java() to control java access git-svn-id: https://luan-java.googlecode.com/svn/trunk@301 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 16 Dec 2014 13:13:33 +0000
parents a74559240b4f
children a6bf8ff720f8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
167
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diff changeset
1 package luan.modules;
37
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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;
37
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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 java.util.Arrays;
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19 import luan.Luan;
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20 import luan.LuanState;
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21 import luan.LuanTable;
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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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ebe9db183eb7 rename *Lib.java to *Luan.java
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28 public final class JavaLuan {
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29
300
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30 public static void java(LuanState luan) {
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31 luan.currentEnvironment().setJava();
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32 }
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33
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34 public static final LuanFunction javaFn;
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35 static {
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36 try {
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37 javaFn = new LuanJavaFunction(JavaLuan.class.getMethod("java",LuanState.class),null);
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38 } catch(NoSuchMethodException e) {
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39 throw new RuntimeException(e);
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40 }
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41 }
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42
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43 private static void checkJava(LuanState luan) throws LuanException {
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44 if( !luan.currentEnvironment().hasJava() )
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45 throw luan.exception("Java isn't allowed");
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46 }
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47
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48 private static boolean isLoaded(LuanState luan) {
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49 // return PackageLuan.loaded(luan).get("luan:Java") != null;
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50 return true;
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51 }
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52
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53 public static Object __index(LuanState luan,Object obj,Object key) throws LuanException {
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54 if( !luan.currentEnvironment().hasJava() )
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55 return null;
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56 if( obj instanceof Static ) {
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57 if( key instanceof String ) {
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58 String name = (String)key;
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59 Static st = (Static)obj;
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60 Class cls = st.cls;
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61 if( "class".equals(name) ) {
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62 return cls;
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63 } else if( "new".equals(name) ) {
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64 Constructor<?>[] constructors = cls.getConstructors();
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65 if( constructors.length > 0 ) {
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66 if( constructors.length==1 ) {
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67 return new LuanJavaFunction(constructors[0],null);
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68 } else {
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69 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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70 for( Constructor constructor : constructors ) {
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71 fns.add(new LuanJavaFunction(constructor,null));
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72 }
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73 return new AmbiguousJavaFunction(fns);
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74 }
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75 }
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76 } else if( "assert".equals(name) ) {
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77 return new LuanJavaFunction(assertClass,new AssertClass(cls));
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78 } else {
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79 List<Member> members = getStaticMembers(cls,name);
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80 if( !members.isEmpty() ) {
208
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81 return member(null,members);
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82 }
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83 }
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84 }
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85 throw luan.exception("invalid member '"+key+"' for: "+obj);
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86 }
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87 Class cls = obj.getClass();
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88 if( cls.isArray() ) {
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89 if( "length".equals(key) ) {
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90 return Array.getLength(obj);
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91 }
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92 Integer i = Luan.asInteger(key);
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93 if( i != null ) {
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94 return Array.get(obj,i);
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95 }
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96 throw luan.exception("invalid member '"+key+"' for java array: "+obj);
37
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97 }
208
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98 if( key instanceof String ) {
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99 String name = (String)key;
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100 if( "instanceof".equals(name) ) {
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101 return new LuanJavaFunction(instanceOf,new InstanceOf(obj));
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102 } else {
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103 List<Member> members = getMembers(cls,name);
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104 if( !members.isEmpty() ) {
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105 return member(obj,members);
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106 }
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107 }
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108 }
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109 // throw luan.exception("invalid member '"+key+"' for java object: "+obj);
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110 //System.out.println("invalid member '"+key+"' for java object: "+obj);
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111 return null;
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112 }
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113
56
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114 private static Object member(Object obj,List<Member> members) throws LuanException {
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115 try {
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116 if( members.size()==1 ) {
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117 Member member = members.get(0);
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118 if( member instanceof Static ) {
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119 return member;
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120 } else if( member instanceof Field ) {
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121 Field field = (Field)member;
157
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122 Object rtn = field.get(obj);
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123 return rtn instanceof Object[] ? Arrays.asList((Object[])rtn) : rtn;
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124 } else {
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125 Method method = (Method)member;
297
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126 return new LuanJavaFunction(method,obj);
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127 }
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128 } else {
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129 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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130 for( Member member : members ) {
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131 Method method = (Method)member;
297
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132 fns.add(new LuanJavaFunction(method,obj));
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133 }
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134 return new AmbiguousJavaFunction(fns);
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135 }
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136 } catch(IllegalAccessException e) {
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137 throw new RuntimeException(e);
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138 }
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139 }
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140
60
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141 public static void __newindex(LuanState luan,Object obj,Object key,Object value) throws LuanException {
300
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142 checkJava(luan);
60
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143 if( obj instanceof Static ) {
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144 if( key instanceof String ) {
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145 String name = (String)key;
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146 Static st = (Static)obj;
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147 Class cls = st.cls;
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148 List<Member> members = getStaticMembers(cls,name);
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149 if( !members.isEmpty() ) {
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150 if( members.size() != 1 )
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151 throw new RuntimeException("not field '"+name+"' of "+obj);
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152 setMember(obj,members,value);
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153 return;
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154 }
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155 }
130
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156 throw luan.exception("invalid member '"+key+"' for: "+obj);
60
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157 }
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158 Class cls = obj.getClass();
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159 if( cls.isArray() ) {
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160 Integer i = Luan.asInteger(key);
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161 if( i != null ) {
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162 Array.set(obj,i,value);
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163 return;
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164 }
130
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165 throw luan.exception("invalid member '"+key+"' for java array: "+obj);
60
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166 }
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167 if( key instanceof String ) {
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168 String name = (String)key;
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169 List<Member> members = getMembers(cls,name);
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170 if( !members.isEmpty() ) {
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171 if( members.size() != 1 )
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172 throw new RuntimeException("not field '"+name+"' of "+obj);
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173 setMember(obj,members,value);
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174 return;
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175 }
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176 }
130
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177 throw luan.exception("invalid member '"+key+"' for java object: "+obj);
60
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178 }
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179
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180 private static void setMember(Object obj,List<Member> members,Object value) {
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181 Field field = (Field)members.get(0);
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182 try {
100
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183 try {
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184 field.set(obj,value);
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185 } catch(IllegalArgumentException e) {
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186 Class cls = field.getType();
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187 if( value instanceof Number ) {
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188 Number n = (Number)value;
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189 if( cls.equals(Integer.TYPE) || cls.equals(Integer.class) ) {
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190 int r = n.intValue();
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191 if( r==n.doubleValue() ) {
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192 field.setInt(obj,r);
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193 return;
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194 }
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195 }
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196 }
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diff changeset
197 throw e;
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198 }
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199 } catch(IllegalAccessException e) {
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200 throw new RuntimeException(e);
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201 }
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202 }
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203
102
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204 public static boolean privateAccess = false;
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205 private static Map<Class,Map<String,List<Member>>> memberMap = new HashMap<Class,Map<String,List<Member>>>();
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206
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207 private static synchronized List<Member> getMembers(Class cls,String name) {
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208 Map<String,List<Member>> clsMap = memberMap.get(cls);
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209 if( clsMap == null ) {
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210 clsMap = new HashMap<String,List<Member>>();
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211 for( Class c : cls.getClasses() ) {
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212 String s = c.getSimpleName();
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213 List<Member> list = new ArrayList<Member>();
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214 clsMap.put(s,list);
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215 list.add(new Static(c));
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216 }
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217 for( Field field : cls.getFields() ) {
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218 String s = field.getName();
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219 try {
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220 if( !cls.getField(s).equals(field) )
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221 continue; // not accessible
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222 } catch(NoSuchFieldException e) {
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223 throw new RuntimeException(e);
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224 }
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225 List<Member> list = new ArrayList<Member>();
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226 clsMap.put(s,list);
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227 list.add(field);
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228 }
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229 for( Method method : cls.getMethods() ) {
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230 String s = method.getName();
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231 List<Member> list = clsMap.get(s);
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232 if( list == null || !(list.get(0) instanceof Method) ) {
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233 list = new ArrayList<Member>();
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234 clsMap.put(s,list);
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235 }
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236 list.add(method);
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237 }
102
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238 if( privateAccess ) {
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239 for( Method method : cls.getDeclaredMethods() ) {
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240 String s = method.getName();
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241 List<Member> list = clsMap.get(s);
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242 if( list == null ) {
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243 list = new ArrayList<Member>();
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244 clsMap.put(s,list);
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245 } else if( !(list.get(0) instanceof Method) )
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246 continue;
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247 if( !list.contains(method) ) {
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248 list.add(method);
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249 }
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250 }
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251 for( Field field : cls.getDeclaredFields() ) {
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252 String s = field.getName();
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253 List<Member> list = clsMap.get(s);
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254 if( list == null ) {
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255 list = new ArrayList<Member>();
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256 clsMap.put(s,list);
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257 list.add(field);
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258 }
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259 }
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260 }
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261 for( List<Member> members : clsMap.values() ) {
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262 for( Member m : members ) {
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263 if( m instanceof AccessibleObject )
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264 ((AccessibleObject)m).setAccessible(true);
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265 }
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266 }
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267 memberMap.put(cls,clsMap);
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268 }
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269 List<Member> rtn = clsMap.get(name);
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270 if( rtn==null )
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271 rtn = Collections.emptyList();
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272 return rtn;
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273 }
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274
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275 private static synchronized List<Member> getStaticMembers(Class cls,String name) {
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276 List<Member> staticMembers = new ArrayList<Member>();
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277 for( Member m : getMembers(cls,name) ) {
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278 if( Modifier.isStatic(m.getModifiers()) )
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279 staticMembers.add(m);
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280 }
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281 return staticMembers;
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282 }
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283
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284 static final class Static implements Member {
37
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285 final Class cls;
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286
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287 Static(Class cls) {
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288 this.cls = cls;
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289 }
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290
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291 @Override public String toString() {
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292 return cls.toString();
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293 }
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294
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295 @Override public Class<?> getDeclaringClass() {
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296 return cls.getDeclaringClass();
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297 }
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298
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299 @Override public String getName() {
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300 return cls.getName();
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301 }
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302
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303 @Override public int getModifiers() {
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304 return cls.getModifiers();
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305 }
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306
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307 @Override public boolean isSynthetic() {
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308 return cls.isSynthetic();
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309 }
37
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310 }
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311
299
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312 public static Static load(LuanState luan,String name) throws LuanException {
300
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313 checkJava(luan);
299
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314 @SuppressWarnings("unchecked")
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315 Map<String,Static> loaded = (Map<String,Static>)luan.registry().get("Java.loaded");
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316 if( loaded == null ) {
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317 loaded = new HashMap<String,Static>();
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318 luan.registry().put("Java.loaded",loaded);
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319 }
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320 Static s = loaded.get(name);
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321 if( s == null ) {
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322 s = getClassStatic(luan,name);
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323 loaded.put(name,s);
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324 }
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325 return s;
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326 }
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327
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328 private static Static getClassStatic(LuanState luan,String name) throws LuanException {
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329 Class cls;
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330 try {
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331 cls = Class.forName(name);
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332 } catch(ClassNotFoundException e) {
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333 try {
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334 cls = Thread.currentThread().getContextClassLoader().loadClass(name);
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335 } catch(ClassNotFoundException e2) {
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336 return null;
51
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337 }
37
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338 }
51
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339 return new Static(cls);
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340 }
300
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341
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342 private static class AmbiguousJavaFunction extends LuanFunction {
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343 private final Map<Integer,List<LuanJavaFunction>> fnMap = new HashMap<Integer,List<LuanJavaFunction>>();
37
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344
48
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345 AmbiguousJavaFunction(List<LuanJavaFunction> fns) {
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346 for( LuanJavaFunction fn : fns ) {
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347 Integer n = fn.getParameterTypes().length;
48
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348 List<LuanJavaFunction> list = fnMap.get(n);
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349 if( list==null ) {
48
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350 list = new ArrayList<LuanJavaFunction>();
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351 fnMap.put(n,list);
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352 }
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353 list.add(fn);
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354 }
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355 }
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356
112
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357 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
48
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358 for( LuanJavaFunction fn : fnMap.get(args.length) ) {
37
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359 try {
55
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360 return fn.rawCall(luan,args);
37
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361 } catch(IllegalArgumentException e) {}
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362 }
130
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363 throw luan.exception("no method matched args");
37
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364 }
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365 }
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366
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367 private static class InstanceOf {
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368 private final Object obj;
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369
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370 InstanceOf(Object obj) {
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371 this.obj = obj;
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372 }
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373
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374 public boolean instanceOf(Static st) {
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375 return st.cls.isInstance(obj);
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376 }
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377 }
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378 private static final Method instanceOf;
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379 static {
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380 try {
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381 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class);
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382 instanceOf.setAccessible(true);
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383 } catch(NoSuchMethodException e) {
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384 throw new RuntimeException(e);
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385 }
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386 }
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387
61
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388
64
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389 private static class AssertClass {
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390 private final Class cls;
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391
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392 AssertClass(Class cls) {
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393 this.cls = cls;
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394 }
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395
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diff changeset
396 public Object assertClass(LuanState luan,Object v) throws LuanException {
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397 if( !cls.isInstance(v) ) {
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398 String got = v.getClass().getSimpleName();
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diff changeset
399 String expected = cls.getSimpleName();
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400 throw luan.exception("bad argument #1 ("+expected+" expected, got "+got+")");
64
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401 }
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diff changeset
402 return v;
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403 }
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diff changeset
404 }
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diff changeset
405 private static final Method assertClass;
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diff changeset
406 static {
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407 try {
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408 assertClass = AssertClass.class.getMethod("assertClass",LuanState.class,Object.class);
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409 assertClass.setAccessible(true);
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410 } catch(NoSuchMethodException e) {
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411 throw new RuntimeException(e);
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412 }
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413 }
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414
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415
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416 public static Object proxy(final LuanState luan,Static st,final LuanTable t,final Object base) throws LuanException {
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417 return Proxy.newProxyInstance(
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418 st.cls.getClassLoader(),
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419 new Class[]{st.cls},
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420 new InvocationHandler() {
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421 public Object invoke(Object proxy,Method method, Object[] args)
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422 throws Throwable
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423 {
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424 if( args==null )
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425 args = new Object[0];
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426 String name = method.getName();
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427 Object fnObj = t.get(name);
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428 if( fnObj==null && base!=null )
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429 return method.invoke(base,args);
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430 LuanFunction fn = luan.checkFunction(fnObj);
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431 return Luan.first(luan.call(fn,name,args));
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432 }
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433 }
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434 );
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435 }
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436 }