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annotate core/src/luan/modules/JavaLuan.java @ 229:2a54cb7d1cf4

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improve security git-svn-id: https://luan-java.googlecode.com/svn/trunk@230 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 24 Sep 2014 21:13:46 +0000
parents ec016471c6eb
children 9e0d4452e649
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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;
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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) throws LuanException {
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32 if( PackageLuan.is_blocked(luan,"Java") )
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33 throw luan.exception("Java is blocked");
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34 LuanTable module = Luan.newTable();
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35 try {
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36 module.put( "block", new LuanJavaFunction(JavaLuan.class.getMethod("block",LuanState.class),null) );
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37 module.put( "class", new LuanJavaFunction(JavaLuan.class.getMethod("getClass",LuanState.class,String.class),null) );
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38 add( module, "proxy", LuanState.class, Static.class, LuanTable.class, Object.class );
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39 } catch(NoSuchMethodException e) {
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40 throw new RuntimeException(e);
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41 }
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42 return module;
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43 }
73
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44 };
37
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45
202
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46 private static boolean isLoaded(LuanState luan) {
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47 return PackageLuan.loaded(luan).get("Java") != null;
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48 }
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49
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50 public static final LuanFunction javaSearcher = new LuanFunction() {
112
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51 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
202
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52 if( !isLoaded(luan) )
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53 return LuanFunction.NOTHING;
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54 String modName = (String)args[0];
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55 final Static s = JavaLuan.getClass(luan,modName);
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56 if( s==null )
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57 return null;
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58 LuanFunction loader = new LuanFunction() {
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59 @Override public Object call(LuanState luan,Object[] args) {
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60 return s;
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61 }
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62 };
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63 return loader;
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64 }
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65 };
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66
48
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67 private static void add(LuanTable t,String method,Class<?>... parameterTypes) {
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68 try {
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69 t.put( method, new LuanJavaFunction(JavaLuan.class.getMethod(method,parameterTypes),null) );
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70 } catch(NoSuchMethodException e) {
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71 throw new RuntimeException(e);
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72 }
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73 }
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74
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75 public static void block(LuanState luan) {
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76 PackageLuan.block(luan,"Java");
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77 }
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78
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79 public static Object __index(LuanState luan,Object obj,Object key) throws LuanException {
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80 if( obj instanceof Static ) {
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81 if( key instanceof String ) {
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82 String name = (String)key;
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83 Static st = (Static)obj;
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84 Class cls = st.cls;
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85 if( "class".equals(name) ) {
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86 return cls;
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87 } else if( "new".equals(name) ) {
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88 Constructor<?>[] constructors = cls.getConstructors();
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89 if( constructors.length > 0 ) {
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90 if( constructors.length==1 ) {
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91 return new LuanJavaFunction(constructors[0],null);
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92 } else {
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93 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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94 for( Constructor constructor : constructors ) {
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95 fns.add(new LuanJavaFunction(constructor,null));
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96 }
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97 return new AmbiguousJavaFunction(fns);
197
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98 }
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99 }
208
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100 } else if( "assert".equals(name) ) {
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101 return new LuanJavaFunction(assertClass,new AssertClass(cls));
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102 } else {
208
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103 List<Member> members = getStaticMembers(cls,name);
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104 if( !members.isEmpty() ) {
208
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105 return member(null,members);
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106 }
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107 }
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108 }
208
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109 throw luan.exception("invalid member '"+key+"' for: "+obj);
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110 }
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111 Class cls = obj.getClass();
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112 if( cls.isArray() ) {
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113 if( "length".equals(key) ) {
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114 return Array.getLength(obj);
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115 }
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116 Integer i = Luan.asInteger(key);
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117 if( i != null ) {
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118 return Array.get(obj,i);
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119 }
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120 throw luan.exception("invalid member '"+key+"' for java array: "+obj);
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121 }
208
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122 if( key instanceof String ) {
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123 String name = (String)key;
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124 if( "instanceof".equals(name) ) {
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125 return new LuanJavaFunction(instanceOf,new InstanceOf(obj));
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126 } else {
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127 List<Member> members = getMembers(cls,name);
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128 if( !members.isEmpty() ) {
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129 if( name.equals("getClass") && !isLoaded(luan) )
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130 return null; // security
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131 return member(obj,members);
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132 }
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133 }
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134 }
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135 // throw luan.exception("invalid member '"+key+"' for java object: "+obj);
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136 return null;
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137 }
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138
56
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139 private static Object member(Object obj,List<Member> members) throws LuanException {
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140 try {
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141 if( members.size()==1 ) {
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142 Member member = members.get(0);
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143 if( member instanceof Static ) {
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144 return member;
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145 } else if( member instanceof Field ) {
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146 Field field = (Field)member;
157
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147 Object rtn = field.get(obj);
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148 return rtn instanceof Object[] ? Arrays.asList((Object[])rtn) : rtn;
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149 } else {
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150 Method method = (Method)member;
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151 return new LuanJavaFunction(method,obj,true);
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152 }
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153 } else {
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154 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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155 for( Member member : members ) {
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156 Method method = (Method)member;
209
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157 fns.add(new LuanJavaFunction(method,obj,true));
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158 }
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159 return new AmbiguousJavaFunction(fns);
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160 }
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161 } catch(IllegalAccessException e) {
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162 throw new RuntimeException(e);
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163 }
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164 }
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165
60
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166 public static void __newindex(LuanState luan,Object obj,Object key,Object value) throws LuanException {
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167 if( obj instanceof Static ) {
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168 if( key instanceof String ) {
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169 String name = (String)key;
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170 Static st = (Static)obj;
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171 Class cls = st.cls;
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172 List<Member> members = getStaticMembers(cls,name);
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173 if( !members.isEmpty() ) {
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174 if( members.size() != 1 )
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175 throw new RuntimeException("not field '"+name+"' of "+obj);
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176 setMember(obj,members,value);
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177 return;
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178 }
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179 }
130
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180 throw luan.exception("invalid member '"+key+"' for: "+obj);
60
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181 }
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182 Class cls = obj.getClass();
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183 if( cls.isArray() ) {
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184 Integer i = Luan.asInteger(key);
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185 if( i != null ) {
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186 Array.set(obj,i,value);
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187 return;
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188 }
130
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189 throw luan.exception("invalid member '"+key+"' for java array: "+obj);
60
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190 }
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191 if( key instanceof String ) {
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192 String name = (String)key;
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193 List<Member> members = getMembers(cls,name);
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194 if( !members.isEmpty() ) {
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195 if( members.size() != 1 )
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196 throw new RuntimeException("not field '"+name+"' of "+obj);
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197 setMember(obj,members,value);
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198 return;
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199 }
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200 }
130
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201 throw luan.exception("invalid member '"+key+"' for java object: "+obj);
60
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202 }
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203
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204 private static void setMember(Object obj,List<Member> members,Object value) {
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205 Field field = (Field)members.get(0);
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206 try {
100
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207 try {
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208 field.set(obj,value);
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209 } catch(IllegalArgumentException e) {
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210 Class cls = field.getType();
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211 if( value instanceof Number ) {
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212 Number n = (Number)value;
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213 if( cls.equals(Integer.TYPE) || cls.equals(Integer.class) ) {
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214 int r = n.intValue();
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215 if( r==n.doubleValue() ) {
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216 field.setInt(obj,r);
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217 return;
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218 }
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219 }
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220 }
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221 throw e;
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222 }
60
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223 } catch(IllegalAccessException e) {
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224 throw new RuntimeException(e);
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225 }
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226 }
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227
102
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228 public static boolean privateAccess = false;
56
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229 private static Map<Class,Map<String,List<Member>>> memberMap = new HashMap<Class,Map<String,List<Member>>>();
37
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230
56
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231 private static synchronized List<Member> getMembers(Class cls,String name) {
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232 Map<String,List<Member>> clsMap = memberMap.get(cls);
37
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233 if( clsMap == null ) {
56
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234 clsMap = new HashMap<String,List<Member>>();
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235 for( Class c : cls.getClasses() ) {
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236 String s = c.getSimpleName();
71
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237 List<Member> list = new ArrayList<Member>();
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238 clsMap.put(s,list);
56
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239 list.add(new Static(c));
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240 }
37
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241 for( Field field : cls.getFields() ) {
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242 String s = field.getName();
58
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243 try {
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244 if( !cls.getField(s).equals(field) )
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245 continue; // not accessible
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246 } catch(NoSuchFieldException e) {
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247 throw new RuntimeException(e);
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248 }
71
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249 List<Member> list = new ArrayList<Member>();
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250 clsMap.put(s,list);
37
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251 list.add(field);
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252 }
71
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253 for( Method method : cls.getMethods() ) {
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254 String s = method.getName();
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255 List<Member> list = clsMap.get(s);
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256 if( list == null || !(list.get(0) instanceof Method) ) {
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257 list = new ArrayList<Member>();
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258 clsMap.put(s,list);
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259 }
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260 list.add(method);
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261 }
102
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diff changeset
262 if( privateAccess ) {
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diff changeset
263 for( Method method : cls.getDeclaredMethods() ) {
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diff changeset
264 String s = method.getName();
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265 List<Member> list = clsMap.get(s);
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266 if( list == null ) {
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267 list = new ArrayList<Member>();
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diff changeset
268 clsMap.put(s,list);
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269 } else if( !(list.get(0) instanceof Method) )
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diff changeset
270 continue;
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271 if( !list.contains(method) ) {
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272 list.add(method);
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273 }
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274 }
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275 for( Field field : cls.getDeclaredFields() ) {
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276 String s = field.getName();
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277 List<Member> list = clsMap.get(s);
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278 if( list == null ) {
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279 list = new ArrayList<Member>();
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diff changeset
280 clsMap.put(s,list);
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281 list.add(field);
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282 }
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283 }
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284 }
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diff changeset
285 for( List<Member> members : clsMap.values() ) {
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286 for( Member m : members ) {
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diff changeset
287 if( m instanceof AccessibleObject )
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288 ((AccessibleObject)m).setAccessible(true);
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289 }
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290 }
37
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diff changeset
291 memberMap.put(cls,clsMap);
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292 }
56
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diff changeset
293 List<Member> rtn = clsMap.get(name);
55
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diff changeset
294 if( rtn==null )
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295 rtn = Collections.emptyList();
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diff changeset
296 return rtn;
37
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297 }
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298
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299 private static synchronized List<Member> getStaticMembers(Class cls,String name) {
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300 List<Member> staticMembers = new ArrayList<Member>();
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301 for( Member m : getMembers(cls,name) ) {
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302 if( Modifier.isStatic(m.getModifiers()) )
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303 staticMembers.add(m);
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304 }
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305 return staticMembers;
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306 }
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307
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308 static final class Static implements Member {
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309 final Class cls;
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310
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311 Static(Class cls) {
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312 this.cls = cls;
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313 }
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314
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315 @Override public String toString() {
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316 return cls.toString();
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317 }
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318
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319 @Override public Class<?> getDeclaringClass() {
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320 return cls.getDeclaringClass();
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321 }
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322
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323 @Override public String getName() {
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324 return cls.getName();
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325 }
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326
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327 @Override public int getModifiers() {
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328 return cls.getModifiers();
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329 }
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330
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331 @Override public boolean isSynthetic() {
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332 return cls.isSynthetic();
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333 }
37
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334 }
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335
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diff changeset
336 public static Static getClass(LuanState luan,String name) throws LuanException {
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337 Class cls;
37
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338 try {
51
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339 cls = Class.forName(name);
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340 } catch(ClassNotFoundException e) {
51
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341 try {
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342 cls = Thread.currentThread().getContextClassLoader().loadClass(name);
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343 } catch(ClassNotFoundException e2) {
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344 return null;
51
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345 }
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346 }
51
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347 return new Static(cls);
37
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348 }
108
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diff changeset
349 /*
49
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diff changeset
350 public static void importClass(LuanState luan,String name) throws LuanException {
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diff changeset
351 luan.currentEnvironment().put( name.substring(name.lastIndexOf('.')+1), getClass(luan,name) );
37
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352 }
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353 */
48
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diff changeset
354 static class AmbiguousJavaFunction extends LuanFunction {
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355 private final Map<Integer,List<LuanJavaFunction>> fnMap = new HashMap<Integer,List<LuanJavaFunction>>();
37
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356
48
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diff changeset
357 AmbiguousJavaFunction(List<LuanJavaFunction> fns) {
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diff changeset
358 for( LuanJavaFunction fn : fns ) {
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diff changeset
359 Integer n = fn.getParameterTypes().length;
48
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diff changeset
360 List<LuanJavaFunction> list = fnMap.get(n);
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361 if( list==null ) {
48
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diff changeset
362 list = new ArrayList<LuanJavaFunction>();
37
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diff changeset
363 fnMap.put(n,list);
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364 }
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365 list.add(fn);
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366 }
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367 }
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368
112
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diff changeset
369 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
48
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diff changeset
370 for( LuanJavaFunction fn : fnMap.get(args.length) ) {
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diff changeset
371 try {
55
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diff changeset
372 return fn.rawCall(luan,args);
37
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373 } catch(IllegalArgumentException e) {}
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374 }
130
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diff changeset
375 throw luan.exception("no method matched args");
37
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376 }
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377 }
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378
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379 private static class InstanceOf {
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380 private final Object obj;
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381
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382 InstanceOf(Object obj) {
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383 this.obj = obj;
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384 }
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385
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386 public boolean instanceOf(Static st) {
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387 return st.cls.isInstance(obj);
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388 }
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389 }
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diff changeset
390 private static final Method instanceOf;
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391 static {
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392 try {
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393 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class);
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394 instanceOf.setAccessible(true);
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395 } catch(NoSuchMethodException e) {
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396 throw new RuntimeException(e);
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397 }
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398 }
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diff changeset
399
61
183d470be7e8 add java.proxy
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diff changeset
400
64
177cfdc2bdb3 add type assertions
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diff changeset
401 private static class AssertClass {
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diff changeset
402 private final Class cls;
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diff changeset
403
177cfdc2bdb3 add type assertions
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diff changeset
404 AssertClass(Class cls) {
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405 this.cls = cls;
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406 }
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407
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408 public Object assertClass(LuanState luan,Object v) throws LuanException {
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409 if( !cls.isInstance(v) ) {
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410 String got = v.getClass().getSimpleName();
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411 String expected = cls.getSimpleName();
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412 throw luan.exception("bad argument #1 ("+expected+" expected, got "+got+")");
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413 }
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414 return v;
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415 }
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416 }
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417 private static final Method assertClass;
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418 static {
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419 try {
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420 assertClass = AssertClass.class.getMethod("assertClass",LuanState.class,Object.class);
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421 assertClass.setAccessible(true);
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422 } catch(NoSuchMethodException e) {
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423 throw new RuntimeException(e);
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424 }
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425 }
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426
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427
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428 public static Object proxy(final LuanState luan,Static st,final LuanTable t,final Object base) throws LuanException {
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429 return Proxy.newProxyInstance(
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430 st.cls.getClassLoader(),
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431 new Class[]{st.cls},
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432 new InvocationHandler() {
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433 public Object invoke(Object proxy,Method method, Object[] args)
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434 throws Throwable
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435 {
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436 if( args==null )
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437 args = new Object[0];
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438 String name = method.getName();
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439 Object fnObj = t.get(name);
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440 if( fnObj==null && base!=null )
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441 return method.invoke(base,args);
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442 LuanFunction fn = luan.checkFunction(fnObj);
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443 return Luan.first(luan.call(fn,name,args));
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444 }
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445 }
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446 );
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447 }
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448 }