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annotate src/luan/lib/JavaLib.java @ 124:f537ff5e511d

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minor cleanup git-svn-id: https://luan-java.googlecode.com/svn/trunk@125 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 06 Jun 2014 03:41:04 +0000
parents f1bf2890d80f
children 0594c132888b
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1 package luan.lib;
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2
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3 import java.lang.reflect.Array;
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4 import java.lang.reflect.AccessibleObject;
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5 import java.lang.reflect.Member;
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6 import java.lang.reflect.Field;
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7 import java.lang.reflect.Method;
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8 import java.lang.reflect.Constructor;
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9 import java.lang.reflect.Modifier;
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10 import java.lang.reflect.InvocationHandler;
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11 import java.lang.reflect.Proxy;
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12 import java.util.Map;
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13 import java.util.HashMap;
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14 import java.util.List;
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15 import java.util.ArrayList;
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16 import java.util.Iterator;
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17 import java.util.Collections;
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18 import luan.Luan;
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19 import luan.LuanState;
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20 import luan.LuanTable;
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21 import luan.MetatableGetter;
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22 import luan.LuanException;
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23 import luan.LuanFunction;
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24 import luan.LuanJavaFunction;
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25 import luan.LuanElement;
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28 public final class JavaLib {
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29
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30 public static void load(LuanState luan) throws LuanException {
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31 luan.load("Java",LOADER);
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32 }
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33
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34 public static final LuanFunction LOADER = new LuanFunction() {
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35 @Override public Object call(LuanState luan,Object[] args) {
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36 luan.addMetatableGetter(mg);
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37 LuanTable module = new LuanTable();
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38 LuanTable global = luan.global();
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39 try {
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40 module.put( "class", new LuanJavaFunction(JavaLib.class.getMethod("getClass",LuanState.class,String.class),null) );
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41 add( module, "proxy", LuanState.class, Static.class, LuanTable.class, Object.class );
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42 } catch(NoSuchMethodException e) {
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43 throw new RuntimeException(e);
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44 }
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45 luan.searchers().add(javaSearcher);
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46 return module;
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47 }
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48 };
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49
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50 public static final LuanFunction javaSearcher = new LuanFunction() {
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51 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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52 String modName = (String)args[0];
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53 final Static s = JavaLib.getClass(luan,modName);
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54 if( s==null )
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55 return null;
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56 LuanFunction loader = new LuanFunction() {
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57 @Override public Object call(LuanState luan,Object[] args) {
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58 return s;
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59 }
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60 };
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61 return loader;
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62 }
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63 };
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64
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65 private static void add(LuanTable t,String method,Class<?>... parameterTypes) {
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66 try {
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67 t.put( method, new LuanJavaFunction(JavaLib.class.getMethod(method,parameterTypes),null) );
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68 } catch(NoSuchMethodException e) {
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69 throw new RuntimeException(e);
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70 }
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71 }
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72
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73 private static final LuanTable mt = new LuanTable();
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74 static {
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75 add( mt, "__index", LuanState.class, Object.class, Object.class );
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76 add( mt, "__newindex", LuanState.class, Object.class, Object.class, Object.class );
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77 }
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78
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79 private static final MetatableGetter mg = new MetatableGetter() {
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80 public LuanTable getMetatable(Object obj) {
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81 if( obj==null )
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82 return null;
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83 return mt;
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84 }
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85 };
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86
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87 public static Object __index(LuanState luan,Object obj,Object key) throws LuanException {
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88 if( obj instanceof Static ) {
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89 if( key instanceof String ) {
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90 String name = (String)key;
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91 Static st = (Static)obj;
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92 Class cls = st.cls;
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93 if( "class".equals(name) ) {
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94 return cls;
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95 } else if( "new".equals(name) ) {
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96 Constructor<?>[] constructors = cls.getConstructors();
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97 if( constructors.length > 0 ) {
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98 if( constructors.length==1 ) {
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99 return new LuanJavaFunction(constructors[0],null);
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100 } else {
48
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101 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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102 for( Constructor constructor : constructors ) {
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103 fns.add(new LuanJavaFunction(constructor,null));
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104 }
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105 return new AmbiguousJavaFunction(fns);
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106 }
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107 }
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108 } else if( "assert".equals(name) ) {
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109 return new LuanJavaFunction(assertClass,new AssertClass(cls));
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110 } else {
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111 List<Member> members = getStaticMembers(cls,name);
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112 if( !members.isEmpty() ) {
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113 return member(null,members);
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114 }
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115 }
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116 }
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117 throw luan.JAVA.exception("invalid member '"+key+"' for: "+obj);
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118 }
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119 Class cls = obj.getClass();
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120 if( cls.isArray() ) {
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121 if( "length".equals(key) ) {
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122 return Array.getLength(obj);
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123 }
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124 Integer i = Luan.asInteger(key);
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125 if( i != null ) {
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126 return Array.get(obj,i);
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127 }
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128 throw luan.JAVA.exception("invalid member '"+key+"' for java array: "+obj);
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129 }
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130 if( key instanceof String ) {
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131 String name = (String)key;
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132 if( "instanceof".equals(name) ) {
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133 return new LuanJavaFunction(instanceOf,new InstanceOf(obj));
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134 } else {
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135 List<Member> members = getMembers(cls,name);
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136 if( !members.isEmpty() ) {
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137 return member(obj,members);
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138 }
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139 }
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140 }
119
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141 // throw luan.JAVA.exception("invalid member '"+key+"' for java object: "+obj);
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142 return null;
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143 }
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144
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145 private static Object member(Object obj,List<Member> members) throws LuanException {
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146 try {
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147 if( members.size()==1 ) {
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148 Member member = members.get(0);
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149 if( member instanceof Static ) {
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150 return member;
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151 } else if( member instanceof Field ) {
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152 Field field = (Field)member;
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153 return field.get(obj);
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154 } else {
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155 Method method = (Method)member;
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156 return new LuanJavaFunction(method,obj);
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157 }
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158 } else {
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159 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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160 for( Member member : members ) {
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161 Method method = (Method)member;
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162 fns.add(new LuanJavaFunction(method,obj));
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163 }
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164 return new AmbiguousJavaFunction(fns);
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165 }
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166 } catch(IllegalAccessException e) {
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167 throw new RuntimeException(e);
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168 }
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169 }
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170
60
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171 public static void __newindex(LuanState luan,Object obj,Object key,Object value) throws LuanException {
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172 if( obj instanceof Static ) {
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173 if( key instanceof String ) {
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174 String name = (String)key;
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175 Static st = (Static)obj;
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176 Class cls = st.cls;
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177 List<Member> members = getStaticMembers(cls,name);
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178 if( !members.isEmpty() ) {
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179 if( members.size() != 1 )
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180 throw new RuntimeException("not field '"+name+"' of "+obj);
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181 setMember(obj,members,value);
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182 return;
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183 }
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184 }
88
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185 throw luan.JAVA.exception("invalid member '"+key+"' for: "+obj);
60
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186 }
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187 Class cls = obj.getClass();
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188 if( cls.isArray() ) {
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189 Integer i = Luan.asInteger(key);
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190 if( i != null ) {
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191 Array.set(obj,i,value);
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192 return;
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193 }
88
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194 throw luan.JAVA.exception("invalid member '"+key+"' for java array: "+obj);
60
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195 }
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196 if( key instanceof String ) {
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197 String name = (String)key;
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198 List<Member> members = getMembers(cls,name);
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199 if( !members.isEmpty() ) {
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200 if( members.size() != 1 )
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201 throw new RuntimeException("not field '"+name+"' of "+obj);
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202 setMember(obj,members,value);
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203 return;
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204 }
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205 }
88
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206 throw luan.JAVA.exception("invalid member '"+key+"' for java object: "+obj);
60
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207 }
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208
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209 private static void setMember(Object obj,List<Member> members,Object value) {
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210 Field field = (Field)members.get(0);
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211 try {
100
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212 try {
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213 field.set(obj,value);
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214 } catch(IllegalArgumentException e) {
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215 Class cls = field.getType();
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216 if( value instanceof Number ) {
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217 Number n = (Number)value;
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218 if( cls.equals(Integer.TYPE) || cls.equals(Integer.class) ) {
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219 int r = n.intValue();
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220 if( r==n.doubleValue() ) {
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221 field.setInt(obj,r);
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222 return;
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223 }
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224 }
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225 }
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226 throw e;
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227 }
60
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228 } catch(IllegalAccessException e) {
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229 throw new RuntimeException(e);
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230 }
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231 }
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diff changeset
232
102
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233 public static boolean privateAccess = false;
56
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234 private static Map<Class,Map<String,List<Member>>> memberMap = new HashMap<Class,Map<String,List<Member>>>();
37
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235
56
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236 private static synchronized List<Member> getMembers(Class cls,String name) {
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237 Map<String,List<Member>> clsMap = memberMap.get(cls);
37
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238 if( clsMap == null ) {
56
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239 clsMap = new HashMap<String,List<Member>>();
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240 for( Class c : cls.getClasses() ) {
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241 String s = c.getSimpleName();
71
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242 List<Member> list = new ArrayList<Member>();
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243 clsMap.put(s,list);
56
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244 list.add(new Static(c));
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245 }
37
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246 for( Field field : cls.getFields() ) {
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247 String s = field.getName();
58
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248 try {
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249 if( !cls.getField(s).equals(field) )
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250 continue; // not accessible
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diff changeset
251 } catch(NoSuchFieldException e) {
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252 throw new RuntimeException(e);
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253 }
71
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diff changeset
254 List<Member> list = new ArrayList<Member>();
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255 clsMap.put(s,list);
37
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256 list.add(field);
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257 }
71
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diff changeset
258 for( Method method : cls.getMethods() ) {
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259 String s = method.getName();
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260 List<Member> list = clsMap.get(s);
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diff changeset
261 if( list == null || !(list.get(0) instanceof Method) ) {
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262 list = new ArrayList<Member>();
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diff changeset
263 clsMap.put(s,list);
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264 }
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diff changeset
265 list.add(method);
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266 }
102
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diff changeset
267 if( privateAccess ) {
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diff changeset
268 for( Method method : cls.getDeclaredMethods() ) {
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diff changeset
269 String s = method.getName();
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diff changeset
270 List<Member> list = clsMap.get(s);
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diff changeset
271 if( list == null ) {
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272 list = new ArrayList<Member>();
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diff changeset
273 clsMap.put(s,list);
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274 } else if( !(list.get(0) instanceof Method) )
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diff changeset
275 continue;
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276 if( !list.contains(method) ) {
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277 list.add(method);
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278 }
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279 }
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diff changeset
280 for( Field field : cls.getDeclaredFields() ) {
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diff changeset
281 String s = field.getName();
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diff changeset
282 List<Member> list = clsMap.get(s);
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diff changeset
283 if( list == null ) {
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diff changeset
284 list = new ArrayList<Member>();
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diff changeset
285 clsMap.put(s,list);
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diff changeset
286 list.add(field);
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287 }
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288 }
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289 }
71
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diff changeset
290 for( List<Member> members : clsMap.values() ) {
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diff changeset
291 for( Member m : members ) {
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diff changeset
292 if( m instanceof AccessibleObject )
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diff changeset
293 ((AccessibleObject)m).setAccessible(true);
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294 }
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295 }
37
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296 memberMap.put(cls,clsMap);
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297 }
56
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diff changeset
298 List<Member> rtn = clsMap.get(name);
55
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diff changeset
299 if( rtn==null )
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diff changeset
300 rtn = Collections.emptyList();
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diff changeset
301 return rtn;
37
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302 }
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303
56
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304 private static synchronized List<Member> getStaticMembers(Class cls,String name) {
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305 List<Member> staticMembers = new ArrayList<Member>();
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306 for( Member m : getMembers(cls,name) ) {
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307 if( Modifier.isStatic(m.getModifiers()) )
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308 staticMembers.add(m);
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309 }
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310 return staticMembers;
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311 }
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312
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313 static final class Static implements Member {
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314 final Class cls;
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315
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316 Static(Class cls) {
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317 this.cls = cls;
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318 }
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319
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320 @Override public String toString() {
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321 return cls.toString();
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322 }
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323
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324 @Override public Class<?> getDeclaringClass() {
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325 return cls.getDeclaringClass();
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326 }
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327
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328 @Override public String getName() {
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329 return cls.getName();
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330 }
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331
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332 @Override public int getModifiers() {
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333 return cls.getModifiers();
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334 }
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335
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336 @Override public boolean isSynthetic() {
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337 return cls.isSynthetic();
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338 }
37
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339 }
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340
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341 public static Static getClass(LuanState luan,String name) throws LuanException {
51
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342 Class cls;
37
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343 try {
51
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344 cls = Class.forName(name);
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345 } catch(ClassNotFoundException e) {
51
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346 try {
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347 cls = Thread.currentThread().getContextClassLoader().loadClass(name);
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348 } catch(ClassNotFoundException e2) {
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349 return null;
51
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350 }
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351 }
51
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352 return new Static(cls);
37
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353 }
108
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354 /*
49
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355 public static void importClass(LuanState luan,String name) throws LuanException {
86
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diff changeset
356 luan.currentEnvironment().put( name.substring(name.lastIndexOf('.')+1), getClass(luan,name) );
37
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357 }
108
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358 */
48
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diff changeset
359 static class AmbiguousJavaFunction extends LuanFunction {
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360 private final Map<Integer,List<LuanJavaFunction>> fnMap = new HashMap<Integer,List<LuanJavaFunction>>();
37
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361
48
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diff changeset
362 AmbiguousJavaFunction(List<LuanJavaFunction> fns) {
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363 for( LuanJavaFunction fn : fns ) {
37
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diff changeset
364 Integer n = fn.getParameterTypes().length;
48
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365 List<LuanJavaFunction> list = fnMap.get(n);
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366 if( list==null ) {
48
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diff changeset
367 list = new ArrayList<LuanJavaFunction>();
37
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368 fnMap.put(n,list);
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369 }
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370 list.add(fn);
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371 }
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372 }
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373
112
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diff changeset
374 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
48
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diff changeset
375 for( LuanJavaFunction fn : fnMap.get(args.length) ) {
37
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376 try {
55
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377 return fn.rawCall(luan,args);
37
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378 } catch(IllegalArgumentException e) {}
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379 }
88
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diff changeset
380 throw luan.JAVA.exception("no method matched args");
37
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381 }
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382 }
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383
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diff changeset
384 private static class InstanceOf {
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385 private final Object obj;
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386
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387 InstanceOf(Object obj) {
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388 this.obj = obj;
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389 }
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390
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391 public boolean instanceOf(Static st) {
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392 return st.cls.isInstance(obj);
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393 }
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394 }
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395 private static final Method instanceOf;
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396 static {
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397 try {
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398 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class);
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diff changeset
399 instanceOf.setAccessible(true);
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400 } catch(NoSuchMethodException e) {
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diff changeset
401 throw new RuntimeException(e);
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402 }
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403 }
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diff changeset
404
61
183d470be7e8 add java.proxy
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diff changeset
405
64
177cfdc2bdb3 add type assertions
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diff changeset
406 private static class AssertClass {
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diff changeset
407 private final Class cls;
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diff changeset
408
177cfdc2bdb3 add type assertions
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diff changeset
409 AssertClass(Class cls) {
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diff changeset
410 this.cls = cls;
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411 }
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412
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413 public Object assertClass(LuanState luan,Object v) throws LuanException {
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414 if( !cls.isInstance(v) ) {
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415 String got = v.getClass().getSimpleName();
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416 String expected = cls.getSimpleName();
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417 throw luan.JAVA.exception("bad argument #1 ("+expected+" expected, got "+got+")");
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418 }
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419 return v;
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420 }
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421 }
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422 private static final Method assertClass;
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423 static {
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424 try {
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425 assertClass = AssertClass.class.getMethod("assertClass",LuanState.class,Object.class);
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426 assertClass.setAccessible(true);
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427 } catch(NoSuchMethodException e) {
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428 throw new RuntimeException(e);
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429 }
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430 }
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431
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432
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433 public static Object proxy(final LuanState luan,Static st,final LuanTable t,final Object base) throws LuanException {
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434 return Proxy.newProxyInstance(
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435 st.cls.getClassLoader(),
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436 new Class[]{st.cls},
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437 new InvocationHandler() {
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438 public Object invoke(Object proxy,Method method, Object[] args)
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439 throws Throwable
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440 {
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441 if( args==null )
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442 args = new Object[0];
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443 String name = method.getName();
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444 Object fnObj = t.get(name);
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445 if( fnObj==null && base!=null )
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446 return method.invoke(base,args);
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447 LuanFunction fn = luan.JAVA.checkFunction(fnObj);
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448 return Luan.first(luan.JAVA.call(fn,name,args));
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449 }
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450 }
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451 );
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452 }
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453 }