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annotate core/src/luan/modules/JavaLuan.java @ 196:be0275bda373

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minor git-svn-id: https://luan-java.googlecode.com/svn/trunk@197 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 03 Jul 2014 18:03:53 +0000
parents 24ede40ee0aa
children 4c96cb73dd93
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rev   line source
167
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diff changeset
1 package luan.modules;
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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.MetatableGetter;
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23 import luan.LuanException;
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24 import luan.LuanFunction;
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25 import luan.LuanJavaFunction;
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26 import luan.LuanElement;
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27 import luan.DeepCloner;
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28
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29
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30 public final class JavaLuan {
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31
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32 public static final LuanFunction LOADER = new LuanFunction() {
112
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33 @Override public Object call(LuanState luan,Object[] args) {
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34 LuanTable module = new LuanTable();
196
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35 module.put( MetatableGetter.KEY, mg );
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36 try {
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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 luan.searchers().add(javaSearcher);
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43 return module;
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44 }
73
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45 };
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46
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47 public static final LuanFunction javaSearcher = new LuanFunction() {
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48 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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49 String modName = (String)args[0];
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50 final Static s = JavaLuan.getClass(luan,modName);
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51 if( s==null )
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52 return null;
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53 LuanFunction loader = new LuanFunction() {
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54 @Override public Object call(LuanState luan,Object[] args) {
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55 return s;
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56 }
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57 };
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58 return loader;
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59 }
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60 };
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61
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62 private static void add(LuanTable t,String method,Class<?>... parameterTypes) {
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63 try {
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64 t.put( method, new LuanJavaFunction(JavaLuan.class.getMethod(method,parameterTypes),null) );
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65 } catch(NoSuchMethodException e) {
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66 throw new RuntimeException(e);
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67 }
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68 }
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69
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70 private static final LuanTable mt = new LuanTable();
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71 static {
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72 add( mt, "__index", LuanState.class, Object.class, Object.class );
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73 add( mt, "__newindex", LuanState.class, Object.class, Object.class, Object.class );
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74 }
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75
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76 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 @Override public MetatableGetter shallowClone() {
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85 return this;
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86 }
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87 @Override public void deepenClone(MetatableGetter clone,DeepCloner cloner) {}
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88 };
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89
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90 public static Object __index(LuanState luan,Object obj,Object key) throws LuanException {
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91 LuanTable mt = luan.getMetatable(obj,mg);
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92 if( mt != null ) {
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93 Object h = mt.get("__index");
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94 if( h instanceof LuanFunction ) {
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95 LuanFunction fn = (LuanFunction)h;
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96 Object rtn = Luan.first(luan.call(fn,new Object[]{obj,key}));
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97 if( rtn != null )
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98 return rtn;
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99 }
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100 }
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101 if( obj instanceof Static ) {
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102 if( key instanceof String ) {
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103 String name = (String)key;
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104 Static st = (Static)obj;
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105 Class cls = st.cls;
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106 if( "class".equals(name) ) {
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107 return cls;
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108 } else if( "new".equals(name) ) {
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109 Constructor<?>[] constructors = cls.getConstructors();
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110 if( constructors.length > 0 ) {
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111 if( constructors.length==1 ) {
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112 return new LuanJavaFunction(constructors[0],null);
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113 } else {
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114 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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115 for( Constructor constructor : constructors ) {
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116 fns.add(new LuanJavaFunction(constructor,null));
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117 }
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118 return new AmbiguousJavaFunction(fns);
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119 }
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120 }
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121 } else if( "assert".equals(name) ) {
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122 return new LuanJavaFunction(assertClass,new AssertClass(cls));
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123 } else {
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124 List<Member> members = getStaticMembers(cls,name);
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125 if( !members.isEmpty() ) {
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126 return member(null,members);
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127 }
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128 }
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129 }
130
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130 throw luan.exception("invalid member '"+key+"' for: "+obj);
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131 }
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132 Class cls = obj.getClass();
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133 if( cls.isArray() ) {
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134 if( "length".equals(key) ) {
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135 return Array.getLength(obj);
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136 }
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137 Integer i = Luan.asInteger(key);
46
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138 if( i != null ) {
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139 return Array.get(obj,i);
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140 }
130
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141 throw luan.exception("invalid member '"+key+"' for java array: "+obj);
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142 }
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143 if( key instanceof String ) {
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144 String name = (String)key;
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145 if( "instanceof".equals(name) ) {
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146 return new LuanJavaFunction(instanceOf,new InstanceOf(obj));
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147 } else {
56
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148 List<Member> members = getMembers(cls,name);
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149 if( !members.isEmpty() ) {
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150 return member(obj,members);
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151 }
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152 }
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153 }
130
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154 // throw luan.exception("invalid member '"+key+"' for java object: "+obj);
119
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155 return null;
37
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156 }
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157
56
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158 private static Object member(Object obj,List<Member> members) throws LuanException {
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159 try {
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160 if( members.size()==1 ) {
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161 Member member = members.get(0);
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diff changeset
162 if( member instanceof Static ) {
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163 return member;
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164 } else if( member instanceof Field ) {
37
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165 Field field = (Field)member;
157
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166 Object rtn = field.get(obj);
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167 return rtn instanceof Object[] ? Arrays.asList((Object[])rtn) : rtn;
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168 } else {
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169 Method method = (Method)member;
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170 return new LuanJavaFunction(method,obj);
37
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171 }
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172 } else {
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173 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
56
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174 for( Member member : members ) {
37
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175 Method method = (Method)member;
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176 fns.add(new LuanJavaFunction(method,obj));
37
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177 }
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178 return new AmbiguousJavaFunction(fns);
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179 }
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180 } catch(IllegalAccessException e) {
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181 throw new RuntimeException(e);
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182 }
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183 }
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184
60
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185 public static void __newindex(LuanState luan,Object obj,Object key,Object value) throws LuanException {
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186 if( obj instanceof Static ) {
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187 if( key instanceof String ) {
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188 String name = (String)key;
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diff changeset
189 Static st = (Static)obj;
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diff changeset
190 Class cls = st.cls;
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191 List<Member> members = getStaticMembers(cls,name);
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192 if( !members.isEmpty() ) {
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193 if( members.size() != 1 )
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diff changeset
194 throw new RuntimeException("not field '"+name+"' of "+obj);
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diff changeset
195 setMember(obj,members,value);
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diff changeset
196 return;
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197 }
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198 }
130
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diff changeset
199 throw luan.exception("invalid member '"+key+"' for: "+obj);
60
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diff changeset
200 }
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201 Class cls = obj.getClass();
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202 if( cls.isArray() ) {
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203 Integer i = Luan.asInteger(key);
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204 if( i != null ) {
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diff changeset
205 Array.set(obj,i,value);
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206 return;
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207 }
130
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208 throw luan.exception("invalid member '"+key+"' for java array: "+obj);
60
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209 }
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diff changeset
210 if( key instanceof String ) {
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211 String name = (String)key;
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212 List<Member> members = getMembers(cls,name);
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213 if( !members.isEmpty() ) {
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214 if( members.size() != 1 )
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215 throw new RuntimeException("not field '"+name+"' of "+obj);
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216 setMember(obj,members,value);
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217 return;
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218 }
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219 }
130
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220 throw luan.exception("invalid member '"+key+"' for java object: "+obj);
60
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221 }
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222
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223 private static void setMember(Object obj,List<Member> members,Object value) {
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224 Field field = (Field)members.get(0);
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225 try {
100
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diff changeset
226 try {
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227 field.set(obj,value);
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228 } catch(IllegalArgumentException e) {
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229 Class cls = field.getType();
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230 if( value instanceof Number ) {
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231 Number n = (Number)value;
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232 if( cls.equals(Integer.TYPE) || cls.equals(Integer.class) ) {
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233 int r = n.intValue();
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234 if( r==n.doubleValue() ) {
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diff changeset
235 field.setInt(obj,r);
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diff changeset
236 return;
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237 }
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238 }
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239 }
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240 throw e;
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241 }
60
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diff changeset
242 } catch(IllegalAccessException e) {
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243 throw new RuntimeException(e);
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244 }
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245 }
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diff changeset
246
102
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diff changeset
247 public static boolean privateAccess = false;
56
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248 private static Map<Class,Map<String,List<Member>>> memberMap = new HashMap<Class,Map<String,List<Member>>>();
37
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249
56
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250 private static synchronized List<Member> getMembers(Class cls,String name) {
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251 Map<String,List<Member>> clsMap = memberMap.get(cls);
37
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252 if( clsMap == null ) {
56
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253 clsMap = new HashMap<String,List<Member>>();
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254 for( Class c : cls.getClasses() ) {
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255 String s = c.getSimpleName();
71
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diff changeset
256 List<Member> list = new ArrayList<Member>();
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257 clsMap.put(s,list);
56
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diff changeset
258 list.add(new Static(c));
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259 }
37
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260 for( Field field : cls.getFields() ) {
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diff changeset
261 String s = field.getName();
58
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diff changeset
262 try {
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diff changeset
263 if( !cls.getField(s).equals(field) )
d6c454b7f58c make concat work with any type;
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parents: 56
diff changeset
264 continue; // not accessible
d6c454b7f58c make concat work with any type;
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parents: 56
diff changeset
265 } catch(NoSuchFieldException e) {
d6c454b7f58c make concat work with any type;
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diff changeset
266 throw new RuntimeException(e);
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parents: 56
diff changeset
267 }
71
5a93129995e1 handle conflicting java member names
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diff changeset
268 List<Member> list = new ArrayList<Member>();
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diff changeset
269 clsMap.put(s,list);
37
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diff changeset
270 list.add(field);
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271 }
71
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diff changeset
272 for( Method method : cls.getMethods() ) {
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diff changeset
273 String s = method.getName();
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diff changeset
274 List<Member> list = clsMap.get(s);
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diff changeset
275 if( list == null || !(list.get(0) instanceof Method) ) {
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diff changeset
276 list = new ArrayList<Member>();
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diff changeset
277 clsMap.put(s,list);
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diff changeset
278 }
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diff changeset
279 list.add(method);
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diff changeset
280 }
102
90b918cbf888 add JavaLib.privateAccess
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diff changeset
281 if( privateAccess ) {
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diff changeset
282 for( Method method : cls.getDeclaredMethods() ) {
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parents: 100
diff changeset
283 String s = method.getName();
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diff changeset
284 List<Member> list = clsMap.get(s);
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parents: 100
diff changeset
285 if( list == null ) {
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diff changeset
286 list = new ArrayList<Member>();
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diff changeset
287 clsMap.put(s,list);
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diff changeset
288 } else if( !(list.get(0) instanceof Method) )
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parents: 100
diff changeset
289 continue;
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diff changeset
290 if( !list.contains(method) ) {
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diff changeset
291 list.add(method);
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diff changeset
292 }
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diff changeset
293 }
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diff changeset
294 for( Field field : cls.getDeclaredFields() ) {
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diff changeset
295 String s = field.getName();
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diff changeset
296 List<Member> list = clsMap.get(s);
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diff changeset
297 if( list == null ) {
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diff changeset
298 list = new ArrayList<Member>();
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diff changeset
299 clsMap.put(s,list);
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diff changeset
300 list.add(field);
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301 }
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302 }
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303 }
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304 for( List<Member> members : clsMap.values() ) {
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305 for( Member m : members ) {
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306 if( m instanceof AccessibleObject )
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307 ((AccessibleObject)m).setAccessible(true);
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308 }
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309 }
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310 memberMap.put(cls,clsMap);
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311 }
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312 List<Member> rtn = clsMap.get(name);
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313 if( rtn==null )
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314 rtn = Collections.emptyList();
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315 return rtn;
37
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316 }
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317
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318 private static synchronized List<Member> getStaticMembers(Class cls,String name) {
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319 List<Member> staticMembers = new ArrayList<Member>();
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320 for( Member m : getMembers(cls,name) ) {
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321 if( Modifier.isStatic(m.getModifiers()) )
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322 staticMembers.add(m);
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323 }
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324 return staticMembers;
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325 }
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326
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327 static final class Static implements Member {
37
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328 final Class cls;
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329
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330 Static(Class cls) {
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331 this.cls = cls;
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332 }
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333
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334 @Override public String toString() {
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335 return cls.toString();
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336 }
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337
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338 @Override public Class<?> getDeclaringClass() {
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339 return cls.getDeclaringClass();
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340 }
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341
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342 @Override public String getName() {
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343 return cls.getName();
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344 }
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345
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346 @Override public int getModifiers() {
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347 return cls.getModifiers();
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348 }
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349
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350 @Override public boolean isSynthetic() {
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351 return cls.isSynthetic();
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352 }
37
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353 }
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354
49
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diff changeset
355 public static Static getClass(LuanState luan,String name) throws LuanException {
51
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diff changeset
356 Class cls;
37
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357 try {
51
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358 cls = Class.forName(name);
37
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359 } catch(ClassNotFoundException e) {
51
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diff changeset
360 try {
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diff changeset
361 cls = Thread.currentThread().getContextClassLoader().loadClass(name);
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diff changeset
362 } catch(ClassNotFoundException e2) {
108
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diff changeset
363 return null;
51
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diff changeset
364 }
37
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365 }
51
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diff changeset
366 return new Static(cls);
37
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367 }
108
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diff changeset
368 /*
49
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diff changeset
369 public static void importClass(LuanState luan,String name) throws LuanException {
86
6db8f286fa6c _ENV is per module, not global
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diff changeset
370 luan.currentEnvironment().put( name.substring(name.lastIndexOf('.')+1), getClass(luan,name) );
37
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371 }
108
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diff changeset
372 */
48
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diff changeset
373 static class AmbiguousJavaFunction extends LuanFunction {
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374 private final Map<Integer,List<LuanJavaFunction>> fnMap = new HashMap<Integer,List<LuanJavaFunction>>();
37
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375
48
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diff changeset
376 AmbiguousJavaFunction(List<LuanJavaFunction> fns) {
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diff changeset
377 for( LuanJavaFunction fn : fns ) {
37
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diff changeset
378 Integer n = fn.getParameterTypes().length;
48
64ecb7a3aad7 rename Lua to Luan
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diff changeset
379 List<LuanJavaFunction> list = fnMap.get(n);
37
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diff changeset
380 if( list==null ) {
48
64ecb7a3aad7 rename Lua to Luan
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diff changeset
381 list = new ArrayList<LuanJavaFunction>();
37
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diff changeset
382 fnMap.put(n,list);
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383 }
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diff changeset
384 list.add(fn);
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385 }
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386 }
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diff changeset
387
112
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diff changeset
388 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
48
64ecb7a3aad7 rename Lua to Luan
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diff changeset
389 for( LuanJavaFunction fn : fnMap.get(args.length) ) {
37
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diff changeset
390 try {
55
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diff changeset
391 return fn.rawCall(luan,args);
37
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diff changeset
392 } catch(IllegalArgumentException e) {}
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393 }
130
0594c132888b cleanup
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diff changeset
394 throw luan.exception("no method matched args");
37
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395 }
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396 }
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397
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diff changeset
398 private static class InstanceOf {
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diff changeset
399 private final Object obj;
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400
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diff changeset
401 InstanceOf(Object obj) {
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diff changeset
402 this.obj = obj;
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403 }
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diff changeset
404
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diff changeset
405 public boolean instanceOf(Static st) {
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diff changeset
406 return st.cls.isInstance(obj);
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407 }
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408 }
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409 private static final Method instanceOf;
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410 static {
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411 try {
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412 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class);
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413 instanceOf.setAccessible(true);
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414 } catch(NoSuchMethodException e) {
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415 throw new RuntimeException(e);
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416 }
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417 }
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418
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419
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420 private static class AssertClass {
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421 private final Class cls;
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422
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423 AssertClass(Class cls) {
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424 this.cls = cls;
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425 }
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426
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427 public Object assertClass(LuanState luan,Object v) throws LuanException {
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428 if( !cls.isInstance(v) ) {
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429 String got = v.getClass().getSimpleName();
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430 String expected = cls.getSimpleName();
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431 throw luan.exception("bad argument #1 ("+expected+" expected, got "+got+")");
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432 }
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433 return v;
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434 }
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435 }
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436 private static final Method assertClass;
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437 static {
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438 try {
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439 assertClass = AssertClass.class.getMethod("assertClass",LuanState.class,Object.class);
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440 assertClass.setAccessible(true);
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441 } catch(NoSuchMethodException e) {
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442 throw new RuntimeException(e);
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443 }
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444 }
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445
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446
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447 public static Object proxy(final LuanState luan,Static st,final LuanTable t,final Object base) throws LuanException {
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448 return Proxy.newProxyInstance(
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449 st.cls.getClassLoader(),
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450 new Class[]{st.cls},
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451 new InvocationHandler() {
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452 public Object invoke(Object proxy,Method method, Object[] args)
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453 throws Throwable
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454 {
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455 if( args==null )
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456 args = new Object[0];
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457 String name = method.getName();
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458 Object fnObj = t.get(name);
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459 if( fnObj==null && base!=null )
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460 return method.invoke(base,args);
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461 LuanFunction fn = luan.checkFunction(fnObj);
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462 return Luan.first(luan.call(fn,name,args));
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463 }
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464 }
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465 );
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466 }
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467 }