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annotate core/src/luan/modules/JavaLuan.java @ 208:5ba136769034

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remove MetatableGetter and use a generic metatable instead git-svn-id: https://luan-java.googlecode.com/svn/trunk@209 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 08 Jul 2014 07:04:47 +0000
parents 75750ceb45ee
children 239c8d650028
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;
50
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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 java.util.Arrays;
48
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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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28 public final class JavaLuan {
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29
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30 public static final LuanFunction LOADER = new LuanFunction() {
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31 @Override public Object call(LuanState luan,Object[] args) {
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32 LuanTable module = new LuanTable();
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33 try {
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34 module.put( "class", new LuanJavaFunction(JavaLuan.class.getMethod("getClass",LuanState.class,String.class),null) );
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35 add( module, "proxy", LuanState.class, Static.class, LuanTable.class, Object.class );
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36 } catch(NoSuchMethodException e) {
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37 throw new RuntimeException(e);
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38 }
112
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39 return module;
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40 }
73
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41 };
37
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42
202
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43 private static boolean isLoaded(LuanState luan) {
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44 return PackageLuan.loaded(luan).get("Java") != null;
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45 }
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46
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47 public static final LuanFunction javaSearcher = new LuanFunction() {
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48 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
202
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49 if( !isLoaded(luan) )
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50 return LuanFunction.NOTHING;
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51 String modName = (String)args[0];
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52 final Static s = JavaLuan.getClass(luan,modName);
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53 if( s==null )
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54 return null;
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55 LuanFunction loader = new LuanFunction() {
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56 @Override public Object call(LuanState luan,Object[] args) {
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57 return s;
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58 }
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59 };
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60 return loader;
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61 }
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62 };
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63
48
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64 private static void add(LuanTable t,String method,Class<?>... parameterTypes) {
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65 try {
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66 t.put( method, new LuanJavaFunction(JavaLuan.class.getMethod(method,parameterTypes),null) );
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67 } catch(NoSuchMethodException e) {
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68 throw new RuntimeException(e);
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69 }
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70 }
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71
208
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72 public static Object __index(LuanState luan,Object obj,Object key) throws LuanException {
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73 if( obj instanceof Static ) {
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74 if( key instanceof String ) {
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75 String name = (String)key;
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76 Static st = (Static)obj;
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77 Class cls = st.cls;
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78 if( "class".equals(name) ) {
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79 return cls;
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80 } else if( "new".equals(name) ) {
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81 Constructor<?>[] constructors = cls.getConstructors();
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82 if( constructors.length > 0 ) {
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83 if( constructors.length==1 ) {
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84 return new LuanJavaFunction(constructors[0],null);
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85 } else {
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86 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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87 for( Constructor constructor : constructors ) {
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88 fns.add(new LuanJavaFunction(constructor,null));
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89 }
208
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90 return new AmbiguousJavaFunction(fns);
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91 }
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92 }
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93 } else if( "assert".equals(name) ) {
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94 return new LuanJavaFunction(assertClass,new AssertClass(cls));
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95 } else {
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96 List<Member> members = getStaticMembers(cls,name);
37
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97 if( !members.isEmpty() ) {
208
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98 return member(null,members);
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99 }
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100 }
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101 }
208
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102 throw luan.exception("invalid member '"+key+"' for: "+obj);
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103 }
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104 Class cls = obj.getClass();
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105 if( cls.isArray() ) {
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106 if( "length".equals(key) ) {
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107 return Array.getLength(obj);
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108 }
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109 Integer i = Luan.asInteger(key);
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110 if( i != null ) {
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111 return Array.get(obj,i);
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112 }
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113 throw luan.exception("invalid member '"+key+"' for java array: "+obj);
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114 }
208
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115 if( key instanceof String ) {
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116 String name = (String)key;
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117 if( "instanceof".equals(name) ) {
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118 return new LuanJavaFunction(instanceOf,new InstanceOf(obj));
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119 } else {
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120 List<Member> members = getMembers(cls,name);
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121 if( !members.isEmpty() ) {
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122 if( name.equals("getClass") && !isLoaded(luan) )
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123 return null; // security
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124 return member(obj,members);
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125 }
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126 }
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127 }
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128 // throw luan.exception("invalid member '"+key+"' for java object: "+obj);
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129 return null;
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130 }
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131
56
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132 private static Object member(Object obj,List<Member> members) throws LuanException {
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133 try {
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134 if( members.size()==1 ) {
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135 Member member = members.get(0);
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136 if( member instanceof Static ) {
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137 return member;
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138 } else if( member instanceof Field ) {
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139 Field field = (Field)member;
157
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140 Object rtn = field.get(obj);
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141 return rtn instanceof Object[] ? Arrays.asList((Object[])rtn) : rtn;
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142 } else {
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143 Method method = (Method)member;
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144 return new LuanJavaFunction(method,obj);
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145 }
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146 } else {
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147 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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148 for( Member member : members ) {
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149 Method method = (Method)member;
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150 fns.add(new LuanJavaFunction(method,obj));
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151 }
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152 return new AmbiguousJavaFunction(fns);
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153 }
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154 } catch(IllegalAccessException e) {
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155 throw new RuntimeException(e);
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156 }
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157 }
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158
60
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159 public static void __newindex(LuanState luan,Object obj,Object key,Object value) throws LuanException {
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160 if( obj instanceof Static ) {
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161 if( key instanceof String ) {
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162 String name = (String)key;
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163 Static st = (Static)obj;
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164 Class cls = st.cls;
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165 List<Member> members = getStaticMembers(cls,name);
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166 if( !members.isEmpty() ) {
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167 if( members.size() != 1 )
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168 throw new RuntimeException("not field '"+name+"' of "+obj);
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169 setMember(obj,members,value);
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170 return;
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171 }
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172 }
130
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173 throw luan.exception("invalid member '"+key+"' for: "+obj);
60
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174 }
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175 Class cls = obj.getClass();
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176 if( cls.isArray() ) {
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177 Integer i = Luan.asInteger(key);
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178 if( i != null ) {
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179 Array.set(obj,i,value);
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180 return;
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181 }
130
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182 throw luan.exception("invalid member '"+key+"' for java array: "+obj);
60
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183 }
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184 if( key instanceof String ) {
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185 String name = (String)key;
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186 List<Member> members = getMembers(cls,name);
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187 if( !members.isEmpty() ) {
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188 if( members.size() != 1 )
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189 throw new RuntimeException("not field '"+name+"' of "+obj);
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190 setMember(obj,members,value);
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191 return;
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192 }
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193 }
130
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diff changeset
194 throw luan.exception("invalid member '"+key+"' for java object: "+obj);
60
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195 }
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196
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diff changeset
197 private static void setMember(Object obj,List<Member> members,Object value) {
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198 Field field = (Field)members.get(0);
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199 try {
100
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200 try {
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201 field.set(obj,value);
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202 } catch(IllegalArgumentException e) {
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203 Class cls = field.getType();
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204 if( value instanceof Number ) {
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205 Number n = (Number)value;
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206 if( cls.equals(Integer.TYPE) || cls.equals(Integer.class) ) {
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207 int r = n.intValue();
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208 if( r==n.doubleValue() ) {
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209 field.setInt(obj,r);
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210 return;
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211 }
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212 }
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213 }
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214 throw e;
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215 }
60
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216 } catch(IllegalAccessException e) {
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217 throw new RuntimeException(e);
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218 }
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219 }
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220
102
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221 public static boolean privateAccess = false;
56
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222 private static Map<Class,Map<String,List<Member>>> memberMap = new HashMap<Class,Map<String,List<Member>>>();
37
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223
56
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224 private static synchronized List<Member> getMembers(Class cls,String name) {
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225 Map<String,List<Member>> clsMap = memberMap.get(cls);
37
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226 if( clsMap == null ) {
56
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227 clsMap = new HashMap<String,List<Member>>();
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228 for( Class c : cls.getClasses() ) {
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229 String s = c.getSimpleName();
71
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230 List<Member> list = new ArrayList<Member>();
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231 clsMap.put(s,list);
56
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232 list.add(new Static(c));
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233 }
37
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234 for( Field field : cls.getFields() ) {
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235 String s = field.getName();
58
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236 try {
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237 if( !cls.getField(s).equals(field) )
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238 continue; // not accessible
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239 } catch(NoSuchFieldException e) {
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240 throw new RuntimeException(e);
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241 }
71
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242 List<Member> list = new ArrayList<Member>();
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243 clsMap.put(s,list);
37
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244 list.add(field);
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245 }
71
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246 for( Method method : cls.getMethods() ) {
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247 String s = method.getName();
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248 List<Member> list = clsMap.get(s);
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249 if( list == null || !(list.get(0) instanceof Method) ) {
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250 list = new ArrayList<Member>();
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251 clsMap.put(s,list);
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252 }
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253 list.add(method);
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254 }
102
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255 if( privateAccess ) {
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256 for( Method method : cls.getDeclaredMethods() ) {
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257 String s = method.getName();
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258 List<Member> list = clsMap.get(s);
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259 if( list == null ) {
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260 list = new ArrayList<Member>();
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261 clsMap.put(s,list);
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262 } else if( !(list.get(0) instanceof Method) )
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263 continue;
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264 if( !list.contains(method) ) {
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265 list.add(method);
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266 }
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267 }
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268 for( Field field : cls.getDeclaredFields() ) {
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269 String s = field.getName();
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270 List<Member> list = clsMap.get(s);
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271 if( list == null ) {
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272 list = new ArrayList<Member>();
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273 clsMap.put(s,list);
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274 list.add(field);
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275 }
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276 }
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277 }
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278 for( List<Member> members : clsMap.values() ) {
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279 for( Member m : members ) {
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280 if( m instanceof AccessibleObject )
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281 ((AccessibleObject)m).setAccessible(true);
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282 }
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283 }
37
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284 memberMap.put(cls,clsMap);
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285 }
56
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diff changeset
286 List<Member> rtn = clsMap.get(name);
55
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diff changeset
287 if( rtn==null )
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288 rtn = Collections.emptyList();
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289 return rtn;
37
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290 }
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291
56
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292 private static synchronized List<Member> getStaticMembers(Class cls,String name) {
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293 List<Member> staticMembers = new ArrayList<Member>();
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294 for( Member m : getMembers(cls,name) ) {
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295 if( Modifier.isStatic(m.getModifiers()) )
37
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296 staticMembers.add(m);
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297 }
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298 return staticMembers;
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299 }
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300
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301 static final class Static implements Member {
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302 final Class cls;
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303
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304 Static(Class cls) {
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305 this.cls = cls;
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306 }
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307
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308 @Override public String toString() {
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309 return cls.toString();
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310 }
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311
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312 @Override public Class<?> getDeclaringClass() {
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313 return cls.getDeclaringClass();
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314 }
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315
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316 @Override public String getName() {
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317 return cls.getName();
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318 }
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319
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320 @Override public int getModifiers() {
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321 return cls.getModifiers();
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322 }
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323
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324 @Override public boolean isSynthetic() {
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325 return cls.isSynthetic();
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326 }
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327 }
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328
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329 public static Static getClass(LuanState luan,String name) throws LuanException {
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330 Class cls;
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331 try {
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332 cls = Class.forName(name);
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333 } catch(ClassNotFoundException e) {
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334 try {
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335 cls = Thread.currentThread().getContextClassLoader().loadClass(name);
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336 } catch(ClassNotFoundException e2) {
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337 return null;
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338 }
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339 }
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340 return new Static(cls);
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341 }
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342 /*
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343 public static void importClass(LuanState luan,String name) throws LuanException {
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344 luan.currentEnvironment().put( name.substring(name.lastIndexOf('.')+1), getClass(luan,name) );
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345 }
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346 */
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347 static class AmbiguousJavaFunction extends LuanFunction {
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348 private final Map<Integer,List<LuanJavaFunction>> fnMap = new HashMap<Integer,List<LuanJavaFunction>>();
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349
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350 AmbiguousJavaFunction(List<LuanJavaFunction> fns) {
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351 for( LuanJavaFunction fn : fns ) {
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352 Integer n = fn.getParameterTypes().length;
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353 List<LuanJavaFunction> list = fnMap.get(n);
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354 if( list==null ) {
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355 list = new ArrayList<LuanJavaFunction>();
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356 fnMap.put(n,list);
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357 }
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358 list.add(fn);
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359 }
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360 }
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361
112
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362 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
48
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363 for( LuanJavaFunction fn : fnMap.get(args.length) ) {
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364 try {
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365 return fn.rawCall(luan,args);
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366 } catch(IllegalArgumentException e) {}
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367 }
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368 throw luan.exception("no method matched args");
37
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369 }
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370 }
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371
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372 private static class InstanceOf {
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373 private final Object obj;
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374
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375 InstanceOf(Object obj) {
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376 this.obj = obj;
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377 }
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378
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379 public boolean instanceOf(Static st) {
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380 return st.cls.isInstance(obj);
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381 }
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382 }
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383 private static final Method instanceOf;
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384 static {
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385 try {
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386 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class);
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387 instanceOf.setAccessible(true);
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388 } catch(NoSuchMethodException e) {
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389 throw new RuntimeException(e);
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390 }
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391 }
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392
61
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393
64
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394 private static class AssertClass {
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395 private final Class cls;
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396
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397 AssertClass(Class cls) {
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398 this.cls = cls;
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399 }
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400
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diff changeset
401 public Object assertClass(LuanState luan,Object v) throws LuanException {
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402 if( !cls.isInstance(v) ) {
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diff changeset
403 String got = v.getClass().getSimpleName();
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diff changeset
404 String expected = cls.getSimpleName();
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405 throw luan.exception("bad argument #1 ("+expected+" expected, got "+got+")");
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406 }
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407 return v;
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408 }
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409 }
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410 private static final Method assertClass;
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411 static {
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412 try {
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413 assertClass = AssertClass.class.getMethod("assertClass",LuanState.class,Object.class);
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414 assertClass.setAccessible(true);
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415 } catch(NoSuchMethodException e) {
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416 throw new RuntimeException(e);
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417 }
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418 }
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419
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420
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421 public static Object proxy(final LuanState luan,Static st,final LuanTable t,final Object base) throws LuanException {
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422 return Proxy.newProxyInstance(
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423 st.cls.getClassLoader(),
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424 new Class[]{st.cls},
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425 new InvocationHandler() {
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426 public Object invoke(Object proxy,Method method, Object[] args)
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427 throws Throwable
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428 {
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429 if( args==null )
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430 args = new Object[0];
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431 String name = method.getName();
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432 Object fnObj = t.get(name);
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433 if( fnObj==null && base!=null )
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434 return method.invoke(base,args);
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435 LuanFunction fn = luan.checkFunction(fnObj);
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436 return Luan.first(luan.call(fn,name,args));
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437 }
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438 }
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439 );
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440 }
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441 }