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annotate src/luan/lib/JavaLib.java @ 108:3c404a296995

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make Package module more standard; return _ENV by default; add "import" statement; git-svn-id: https://luan-java.googlecode.com/svn/trunk@109 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 23 May 2014 03:21:54 +0000
parents 90b918cbf888
children f5af13062b10
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 package luan.lib;
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3 import java.lang.reflect.Array;
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4 import java.lang.reflect.AccessibleObject;
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5 import java.lang.reflect.Member;
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6 import java.lang.reflect.Field;
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7 import java.lang.reflect.Method;
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8 import java.lang.reflect.Constructor;
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9 import java.lang.reflect.Modifier;
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10 import java.lang.reflect.InvocationHandler;
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11 import java.lang.reflect.Proxy;
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12 import java.util.Map;
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13 import java.util.HashMap;
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14 import java.util.List;
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15 import java.util.ArrayList;
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16 import java.util.Iterator;
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17 import java.util.Collections;
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18 import luan.Luan;
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19 import luan.LuanState;
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20 import luan.LuanTable;
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21 import luan.MetatableGetter;
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22 import luan.LuanException;
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23 import luan.LuanFunction;
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24 import luan.LuanJavaFunction;
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25 import luan.LuanElement;
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28 public final class JavaLib {
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29
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30 public static final String NAME = "Java";
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32 public static final LuanFunction LOADER = new LuanFunction() {
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33 @Override public Object[] call(LuanState luan,Object[] args) {
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34 luan.addMetatableGetter(mg);
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35 LuanTable module = new LuanTable();
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36 LuanTable global = luan.global();
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37 try {
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38 module.put( "class", new LuanJavaFunction(JavaLib.class.getMethod("getClass",LuanState.class,String.class),null) );
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39 add( module, "proxy", LuanState.class, Static.class, LuanTable.class, Object.class );
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40 } catch(NoSuchMethodException e) {
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41 throw new RuntimeException(e);
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42 }
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43 luan.searchers().add(javaSearcher);
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44 return new Object[]{module};
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45 }
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46 };
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48 public static final LuanFunction javaSearcher = new LuanFunction() {
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49 @Override public Object[] call(LuanState luan,Object[] args) throws LuanException {
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50 String modName = (String)args[0];
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51 final Static s = JavaLib.getClass(luan,modName);
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52 if( s==null )
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53 return LuanFunction.EMPTY;
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54 LuanFunction loader = new LuanFunction() {
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55 @Override public Object[] call(LuanState luan,Object[] args) {
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56 return new Object[]{s};
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57 }
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58 };
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59 return new Object[]{loader};
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60 }
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61 };
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62
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63 private static void add(LuanTable t,String method,Class<?>... parameterTypes) {
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64 try {
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65 t.put( method, new LuanJavaFunction(JavaLib.class.getMethod(method,parameterTypes),null) );
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66 } catch(NoSuchMethodException e) {
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67 throw new RuntimeException(e);
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68 }
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69 }
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71 private static final LuanTable mt = new LuanTable();
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72 static {
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73 add( mt, "__index", LuanState.class, Object.class, Object.class );
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74 add( mt, "__newindex", LuanState.class, Object.class, Object.class, Object.class );
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75 }
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76
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77 private static final MetatableGetter mg = new MetatableGetter() {
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78 public LuanTable getMetatable(Object obj) {
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79 if( obj==null )
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80 return null;
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81 return mt;
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82 }
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83 };
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84
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85 public static Object __index(LuanState luan,Object obj,Object key) throws LuanException {
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86 if( obj instanceof Static ) {
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87 if( key instanceof String ) {
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88 String name = (String)key;
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89 Static st = (Static)obj;
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90 Class cls = st.cls;
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91 if( "class".equals(name) ) {
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92 return cls;
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93 } else if( "new".equals(name) ) {
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94 Constructor<?>[] constructors = cls.getConstructors();
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95 if( constructors.length > 0 ) {
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96 if( constructors.length==1 ) {
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97 return new LuanJavaFunction(constructors[0],null);
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98 } else {
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99 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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100 for( Constructor constructor : constructors ) {
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101 fns.add(new LuanJavaFunction(constructor,null));
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102 }
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103 return new AmbiguousJavaFunction(fns);
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104 }
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105 }
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106 } else if( "assert".equals(name) ) {
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107 return new LuanJavaFunction(assertClass,new AssertClass(cls));
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108 } else {
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109 List<Member> members = getStaticMembers(cls,name);
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110 if( !members.isEmpty() ) {
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111 return member(null,members);
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112 }
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113 }
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114 }
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115 throw luan.JAVA.exception("invalid member '"+key+"' for: "+obj);
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116 }
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117 Class cls = obj.getClass();
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118 if( cls.isArray() ) {
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119 if( "length".equals(key) ) {
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120 return Array.getLength(obj);
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121 }
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122 Integer i = Luan.asInteger(key);
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123 if( i != null ) {
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124 return Array.get(obj,i);
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125 }
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126 throw luan.JAVA.exception("invalid member '"+key+"' for java array: "+obj);
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127 }
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128 if( key instanceof String ) {
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129 String name = (String)key;
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130 if( "instanceof".equals(name) ) {
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131 return new LuanJavaFunction(instanceOf,new InstanceOf(obj));
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132 } else {
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133 List<Member> members = getMembers(cls,name);
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134 if( !members.isEmpty() ) {
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135 return member(obj,members);
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136 }
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137 }
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138 }
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139 throw luan.JAVA.exception("invalid member '"+key+"' for java object: "+obj);
37
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140 }
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141
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142 private static Object member(Object obj,List<Member> members) throws LuanException {
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143 try {
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144 if( members.size()==1 ) {
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145 Member member = members.get(0);
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146 if( member instanceof Static ) {
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147 return member;
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148 } else if( member instanceof Field ) {
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149 Field field = (Field)member;
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150 return field.get(obj);
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151 } else {
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152 Method method = (Method)member;
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153 return new LuanJavaFunction(method,obj);
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154 }
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155 } else {
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156 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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157 for( Member member : members ) {
37
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158 Method method = (Method)member;
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159 fns.add(new LuanJavaFunction(method,obj));
37
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160 }
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161 return new AmbiguousJavaFunction(fns);
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162 }
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163 } catch(IllegalAccessException e) {
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164 throw new RuntimeException(e);
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165 }
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166 }
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167
60
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168 public static void __newindex(LuanState luan,Object obj,Object key,Object value) throws LuanException {
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169 if( obj instanceof Static ) {
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170 if( key instanceof String ) {
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171 String name = (String)key;
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172 Static st = (Static)obj;
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173 Class cls = st.cls;
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174 List<Member> members = getStaticMembers(cls,name);
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175 if( !members.isEmpty() ) {
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176 if( members.size() != 1 )
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177 throw new RuntimeException("not field '"+name+"' of "+obj);
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178 setMember(obj,members,value);
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179 return;
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180 }
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181 }
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182 throw luan.JAVA.exception("invalid member '"+key+"' for: "+obj);
60
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183 }
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diff changeset
184 Class cls = obj.getClass();
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diff changeset
185 if( cls.isArray() ) {
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186 Integer i = Luan.asInteger(key);
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187 if( i != null ) {
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188 Array.set(obj,i,value);
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189 return;
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190 }
88
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191 throw luan.JAVA.exception("invalid member '"+key+"' for java array: "+obj);
60
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192 }
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193 if( key instanceof String ) {
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194 String name = (String)key;
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195 List<Member> members = getMembers(cls,name);
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196 if( !members.isEmpty() ) {
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197 if( members.size() != 1 )
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198 throw new RuntimeException("not field '"+name+"' of "+obj);
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199 setMember(obj,members,value);
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200 return;
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201 }
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diff changeset
202 }
88
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203 throw luan.JAVA.exception("invalid member '"+key+"' for java object: "+obj);
60
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204 }
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205
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206 private static void setMember(Object obj,List<Member> members,Object value) {
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207 Field field = (Field)members.get(0);
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208 try {
100
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209 try {
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210 field.set(obj,value);
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211 } catch(IllegalArgumentException e) {
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212 Class cls = field.getType();
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213 if( value instanceof Number ) {
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214 Number n = (Number)value;
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215 if( cls.equals(Integer.TYPE) || cls.equals(Integer.class) ) {
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216 int r = n.intValue();
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217 if( r==n.doubleValue() ) {
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218 field.setInt(obj,r);
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219 return;
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220 }
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221 }
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222 }
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223 throw e;
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224 }
60
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225 } catch(IllegalAccessException e) {
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226 throw new RuntimeException(e);
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227 }
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228 }
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229
102
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230 public static boolean privateAccess = false;
56
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231 private static Map<Class,Map<String,List<Member>>> memberMap = new HashMap<Class,Map<String,List<Member>>>();
37
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232
56
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233 private static synchronized List<Member> getMembers(Class cls,String name) {
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234 Map<String,List<Member>> clsMap = memberMap.get(cls);
37
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235 if( clsMap == null ) {
56
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236 clsMap = new HashMap<String,List<Member>>();
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237 for( Class c : cls.getClasses() ) {
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238 String s = c.getSimpleName();
71
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239 List<Member> list = new ArrayList<Member>();
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240 clsMap.put(s,list);
56
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241 list.add(new Static(c));
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242 }
37
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243 for( Field field : cls.getFields() ) {
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244 String s = field.getName();
58
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245 try {
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246 if( !cls.getField(s).equals(field) )
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247 continue; // not accessible
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248 } catch(NoSuchFieldException e) {
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249 throw new RuntimeException(e);
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250 }
71
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diff changeset
251 List<Member> list = new ArrayList<Member>();
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252 clsMap.put(s,list);
37
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253 list.add(field);
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254 }
71
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diff changeset
255 for( Method method : cls.getMethods() ) {
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256 String s = method.getName();
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257 List<Member> list = clsMap.get(s);
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258 if( list == null || !(list.get(0) instanceof Method) ) {
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259 list = new ArrayList<Member>();
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260 clsMap.put(s,list);
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261 }
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diff changeset
262 list.add(method);
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263 }
102
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diff changeset
264 if( privateAccess ) {
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diff changeset
265 for( Method method : cls.getDeclaredMethods() ) {
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266 String s = method.getName();
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diff changeset
267 List<Member> list = clsMap.get(s);
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268 if( list == null ) {
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269 list = new ArrayList<Member>();
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diff changeset
270 clsMap.put(s,list);
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271 } else if( !(list.get(0) instanceof Method) )
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diff changeset
272 continue;
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273 if( !list.contains(method) ) {
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274 list.add(method);
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275 }
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276 }
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277 for( Field field : cls.getDeclaredFields() ) {
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278 String s = field.getName();
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279 List<Member> list = clsMap.get(s);
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280 if( list == null ) {
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281 list = new ArrayList<Member>();
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282 clsMap.put(s,list);
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283 list.add(field);
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284 }
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285 }
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286 }
71
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diff changeset
287 for( List<Member> members : clsMap.values() ) {
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288 for( Member m : members ) {
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289 if( m instanceof AccessibleObject )
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diff changeset
290 ((AccessibleObject)m).setAccessible(true);
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291 }
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292 }
37
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293 memberMap.put(cls,clsMap);
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294 }
56
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diff changeset
295 List<Member> rtn = clsMap.get(name);
55
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diff changeset
296 if( rtn==null )
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297 rtn = Collections.emptyList();
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298 return rtn;
37
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299 }
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300
56
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diff changeset
301 private static synchronized List<Member> getStaticMembers(Class cls,String name) {
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302 List<Member> staticMembers = new ArrayList<Member>();
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303 for( Member m : getMembers(cls,name) ) {
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304 if( Modifier.isStatic(m.getModifiers()) )
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305 staticMembers.add(m);
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306 }
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307 return staticMembers;
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308 }
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309
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310 static final class Static implements Member {
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311 final Class cls;
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312
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313 Static(Class cls) {
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314 this.cls = cls;
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315 }
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316
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317 @Override public String toString() {
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318 return cls.toString();
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319 }
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320
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321 @Override public Class<?> getDeclaringClass() {
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322 return cls.getDeclaringClass();
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323 }
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324
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325 @Override public String getName() {
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326 return cls.getName();
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327 }
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328
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329 @Override public int getModifiers() {
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330 return cls.getModifiers();
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331 }
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332
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333 @Override public boolean isSynthetic() {
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334 return cls.isSynthetic();
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335 }
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336 }
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337
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338 public static Static getClass(LuanState luan,String name) throws LuanException {
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339 Class cls;
37
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340 try {
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341 cls = Class.forName(name);
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342 } catch(ClassNotFoundException e) {
51
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343 try {
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344 cls = Thread.currentThread().getContextClassLoader().loadClass(name);
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345 } catch(ClassNotFoundException e2) {
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346 return null;
51
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347 }
37
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348 }
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349 return new Static(cls);
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350 }
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351 /*
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352 public static void importClass(LuanState luan,String name) throws LuanException {
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353 luan.currentEnvironment().put( name.substring(name.lastIndexOf('.')+1), getClass(luan,name) );
37
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354 }
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355 */
48
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356 static class AmbiguousJavaFunction extends LuanFunction {
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357 private final Map<Integer,List<LuanJavaFunction>> fnMap = new HashMap<Integer,List<LuanJavaFunction>>();
37
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358
48
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diff changeset
359 AmbiguousJavaFunction(List<LuanJavaFunction> fns) {
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360 for( LuanJavaFunction fn : fns ) {
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361 Integer n = fn.getParameterTypes().length;
48
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362 List<LuanJavaFunction> list = fnMap.get(n);
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363 if( list==null ) {
48
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364 list = new ArrayList<LuanJavaFunction>();
37
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365 fnMap.put(n,list);
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366 }
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367 list.add(fn);
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368 }
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369 }
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370
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371 @Override public Object[] call(LuanState luan,Object[] args) throws LuanException {
48
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372 for( LuanJavaFunction fn : fnMap.get(args.length) ) {
37
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373 try {
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374 return fn.rawCall(luan,args);
37
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375 } catch(IllegalArgumentException e) {}
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376 }
88
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diff changeset
377 throw luan.JAVA.exception("no method matched args");
37
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378 }
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379 }
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380
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381 private static class InstanceOf {
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382 private final Object obj;
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383
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384 InstanceOf(Object obj) {
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385 this.obj = obj;
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386 }
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387
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388 public boolean instanceOf(Static st) {
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389 return st.cls.isInstance(obj);
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390 }
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391 }
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392 private static final Method instanceOf;
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393 static {
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394 try {
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395 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class);
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396 instanceOf.setAccessible(true);
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397 } catch(NoSuchMethodException e) {
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398 throw new RuntimeException(e);
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399 }
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400 }
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401
61
183d470be7e8 add java.proxy
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diff changeset
402
64
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diff changeset
403 private static class AssertClass {
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diff changeset
404 private final Class cls;
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diff changeset
405
177cfdc2bdb3 add type assertions
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diff changeset
406 AssertClass(Class cls) {
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diff changeset
407 this.cls = cls;
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diff changeset
408 }
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diff changeset
409
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410 public Object assertClass(LuanState luan,Object v) throws LuanException {
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411 if( !cls.isInstance(v) ) {
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412 String got = v.getClass().getSimpleName();
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413 String expected = cls.getSimpleName();
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414 throw luan.JAVA.exception("bad argument #1 ("+expected+" expected, got "+got+")");
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415 }
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416 return v;
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417 }
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418 }
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419 private static final Method assertClass;
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420 static {
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421 try {
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422 assertClass = AssertClass.class.getMethod("assertClass",LuanState.class,Object.class);
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423 assertClass.setAccessible(true);
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424 } catch(NoSuchMethodException e) {
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425 throw new RuntimeException(e);
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426 }
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427 }
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428
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429
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430 public static Object proxy(final LuanState luan,Static st,final LuanTable t,final Object base) throws LuanException {
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431 return Proxy.newProxyInstance(
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432 st.cls.getClassLoader(),
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433 new Class[]{st.cls},
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434 new InvocationHandler() {
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435 public Object invoke(Object proxy,Method method, Object[] args)
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436 throws Throwable
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437 {
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438 if( args==null )
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439 args = new Object[0];
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440 String name = method.getName();
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441 Object fnObj = t.get(name);
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442 if( fnObj==null && base!=null )
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443 return method.invoke(base,args);
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444 LuanFunction fn = luan.JAVA.checkFunction(fnObj);
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445 return Luan.first(luan.JAVA.call(fn,name,args));
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446 }
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447 }
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448 );
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449 }
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450 }