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annotate core/src/luan/modules/JavaLuan.java @ 264:9e0d4452e649

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implement URL style module names git-svn-id: https://luan-java.googlecode.com/svn/trunk@265 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 29 Oct 2014 03:50:59 +0000
parents 2a54cb7d1cf4
children 8ac3eaf8ecd9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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.LuanException;
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23 import luan.LuanFunction;
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24 import luan.LuanJavaFunction;
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25 import luan.LuanElement;
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26
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27
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28 public final class JavaLuan {
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29
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3c404a296995 make Package module more standard;
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30 public static final LuanFunction LOADER = new LuanFunction() {
229
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31 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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32 if( PackageLuan.is_blocked(luan,"Java") )
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33 throw luan.exception("Java is blocked");
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34 LuanTable module = Luan.newTable();
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35 try {
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36 module.put( "block", new LuanJavaFunction(JavaLuan.class.getMethod("block",LuanState.class),null) );
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37 module.put( "class", new LuanJavaFunction(JavaLuan.class.getMethod("getClass",LuanState.class,String.class),null) );
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38 add( module, "proxy", LuanState.class, Static.class, LuanTable.class, Object.class );
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39 } catch(NoSuchMethodException e) {
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40 throw new RuntimeException(e);
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41 }
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42 return module;
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43 }
73
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44 };
37
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45
202
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46 private static boolean isLoaded(LuanState luan) {
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47 return PackageLuan.loaded(luan).get("luan:Java") != null;
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48 }
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49
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50 static LuanFunction javaLoader(LuanState luan,String modName) throws LuanException {
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51 if( !isLoaded(luan) )
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52 return null;
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53 final Static s = JavaLuan.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 private static void add(LuanTable t,String method,Class<?>... parameterTypes) {
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65 try {
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66 t.put( method, new LuanJavaFunction(JavaLuan.class.getMethod(method,parameterTypes),null) );
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67 } catch(NoSuchMethodException e) {
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68 throw new RuntimeException(e);
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69 }
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70 }
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71
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72 public static void block(LuanState luan) {
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73 PackageLuan.block(luan,"Java");
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74 }
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75
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76 public static Object __index(LuanState luan,Object obj,Object key) throws LuanException {
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77 if( obj instanceof Static ) {
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78 if( key instanceof String ) {
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79 String name = (String)key;
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80 Static st = (Static)obj;
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81 Class cls = st.cls;
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82 if( "class".equals(name) ) {
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83 return cls;
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84 } else if( "new".equals(name) ) {
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85 Constructor<?>[] constructors = cls.getConstructors();
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86 if( constructors.length > 0 ) {
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87 if( constructors.length==1 ) {
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88 return new LuanJavaFunction(constructors[0],null);
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89 } else {
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90 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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91 for( Constructor constructor : constructors ) {
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92 fns.add(new LuanJavaFunction(constructor,null));
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93 }
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94 return new AmbiguousJavaFunction(fns);
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95 }
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96 }
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97 } else if( "assert".equals(name) ) {
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98 return new LuanJavaFunction(assertClass,new AssertClass(cls));
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99 } else {
208
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100 List<Member> members = getStaticMembers(cls,name);
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101 if( !members.isEmpty() ) {
208
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102 return member(null,members);
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103 }
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104 }
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105 }
208
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106 throw luan.exception("invalid member '"+key+"' for: "+obj);
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107 }
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108 Class cls = obj.getClass();
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109 if( cls.isArray() ) {
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110 if( "length".equals(key) ) {
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111 return Array.getLength(obj);
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112 }
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113 Integer i = Luan.asInteger(key);
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114 if( i != null ) {
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115 return Array.get(obj,i);
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116 }
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117 throw luan.exception("invalid member '"+key+"' for java array: "+obj);
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118 }
208
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119 if( key instanceof String ) {
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120 String name = (String)key;
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121 if( "instanceof".equals(name) ) {
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122 return new LuanJavaFunction(instanceOf,new InstanceOf(obj));
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123 } else {
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124 List<Member> members = getMembers(cls,name);
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125 if( !members.isEmpty() ) {
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126 if( name.equals("getClass") && !isLoaded(luan) )
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127 return null; // security
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128 return member(obj,members);
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129 }
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130 }
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131 }
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132 // throw luan.exception("invalid member '"+key+"' for java object: "+obj);
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133 return null;
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134 }
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135
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136 private static Object member(Object obj,List<Member> members) throws LuanException {
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137 try {
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138 if( members.size()==1 ) {
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139 Member member = members.get(0);
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140 if( member instanceof Static ) {
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141 return member;
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142 } else if( member instanceof Field ) {
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143 Field field = (Field)member;
157
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144 Object rtn = field.get(obj);
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145 return rtn instanceof Object[] ? Arrays.asList((Object[])rtn) : rtn;
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146 } else {
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147 Method method = (Method)member;
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148 return new LuanJavaFunction(method,obj,true);
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149 }
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150 } else {
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151 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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152 for( Member member : members ) {
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153 Method method = (Method)member;
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154 fns.add(new LuanJavaFunction(method,obj,true));
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155 }
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156 return new AmbiguousJavaFunction(fns);
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157 }
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158 } catch(IllegalAccessException e) {
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159 throw new RuntimeException(e);
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160 }
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161 }
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162
60
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163 public static void __newindex(LuanState luan,Object obj,Object key,Object value) throws LuanException {
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164 if( obj instanceof Static ) {
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165 if( key instanceof String ) {
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166 String name = (String)key;
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167 Static st = (Static)obj;
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168 Class cls = st.cls;
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169 List<Member> members = getStaticMembers(cls,name);
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170 if( !members.isEmpty() ) {
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171 if( members.size() != 1 )
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172 throw new RuntimeException("not field '"+name+"' of "+obj);
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173 setMember(obj,members,value);
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174 return;
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175 }
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176 }
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177 throw luan.exception("invalid member '"+key+"' for: "+obj);
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178 }
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179 Class cls = obj.getClass();
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180 if( cls.isArray() ) {
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181 Integer i = Luan.asInteger(key);
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182 if( i != null ) {
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183 Array.set(obj,i,value);
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184 return;
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185 }
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186 throw luan.exception("invalid member '"+key+"' for java array: "+obj);
60
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187 }
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188 if( key instanceof String ) {
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189 String name = (String)key;
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190 List<Member> members = getMembers(cls,name);
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191 if( !members.isEmpty() ) {
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192 if( members.size() != 1 )
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193 throw new RuntimeException("not field '"+name+"' of "+obj);
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194 setMember(obj,members,value);
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195 return;
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196 }
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197 }
130
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198 throw luan.exception("invalid member '"+key+"' for java object: "+obj);
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199 }
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200
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201 private static void setMember(Object obj,List<Member> members,Object value) {
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202 Field field = (Field)members.get(0);
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203 try {
100
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204 try {
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205 field.set(obj,value);
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206 } catch(IllegalArgumentException e) {
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207 Class cls = field.getType();
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208 if( value instanceof Number ) {
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209 Number n = (Number)value;
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210 if( cls.equals(Integer.TYPE) || cls.equals(Integer.class) ) {
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211 int r = n.intValue();
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212 if( r==n.doubleValue() ) {
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213 field.setInt(obj,r);
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214 return;
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215 }
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216 }
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217 }
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218 throw e;
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219 }
60
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220 } catch(IllegalAccessException e) {
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221 throw new RuntimeException(e);
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222 }
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223 }
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diff changeset
224
102
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225 public static boolean privateAccess = false;
56
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226 private static Map<Class,Map<String,List<Member>>> memberMap = new HashMap<Class,Map<String,List<Member>>>();
37
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227
56
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228 private static synchronized List<Member> getMembers(Class cls,String name) {
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229 Map<String,List<Member>> clsMap = memberMap.get(cls);
37
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230 if( clsMap == null ) {
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231 clsMap = new HashMap<String,List<Member>>();
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232 for( Class c : cls.getClasses() ) {
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233 String s = c.getSimpleName();
71
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234 List<Member> list = new ArrayList<Member>();
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235 clsMap.put(s,list);
56
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236 list.add(new Static(c));
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237 }
37
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238 for( Field field : cls.getFields() ) {
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239 String s = field.getName();
58
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240 try {
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241 if( !cls.getField(s).equals(field) )
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242 continue; // not accessible
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243 } catch(NoSuchFieldException e) {
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244 throw new RuntimeException(e);
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245 }
71
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246 List<Member> list = new ArrayList<Member>();
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247 clsMap.put(s,list);
37
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248 list.add(field);
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249 }
71
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250 for( Method method : cls.getMethods() ) {
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251 String s = method.getName();
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252 List<Member> list = clsMap.get(s);
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253 if( list == null || !(list.get(0) instanceof Method) ) {
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254 list = new ArrayList<Member>();
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255 clsMap.put(s,list);
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256 }
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257 list.add(method);
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258 }
102
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diff changeset
259 if( privateAccess ) {
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diff changeset
260 for( Method method : cls.getDeclaredMethods() ) {
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261 String s = method.getName();
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262 List<Member> list = clsMap.get(s);
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263 if( list == null ) {
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264 list = new ArrayList<Member>();
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diff changeset
265 clsMap.put(s,list);
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266 } else if( !(list.get(0) instanceof Method) )
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diff changeset
267 continue;
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268 if( !list.contains(method) ) {
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269 list.add(method);
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270 }
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271 }
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272 for( Field field : cls.getDeclaredFields() ) {
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273 String s = field.getName();
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274 List<Member> list = clsMap.get(s);
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275 if( list == null ) {
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276 list = new ArrayList<Member>();
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277 clsMap.put(s,list);
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278 list.add(field);
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279 }
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280 }
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281 }
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282 for( List<Member> members : clsMap.values() ) {
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diff changeset
283 for( Member m : members ) {
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284 if( m instanceof AccessibleObject )
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285 ((AccessibleObject)m).setAccessible(true);
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286 }
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diff changeset
287 }
37
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288 memberMap.put(cls,clsMap);
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289 }
56
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diff changeset
290 List<Member> rtn = clsMap.get(name);
55
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diff changeset
291 if( rtn==null )
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diff changeset
292 rtn = Collections.emptyList();
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diff changeset
293 return rtn;
37
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294 }
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295
56
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296 private static synchronized List<Member> getStaticMembers(Class cls,String name) {
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297 List<Member> staticMembers = new ArrayList<Member>();
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298 for( Member m : getMembers(cls,name) ) {
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299 if( Modifier.isStatic(m.getModifiers()) )
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300 staticMembers.add(m);
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301 }
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302 return staticMembers;
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303 }
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304
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305 static final class Static implements Member {
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306 final Class cls;
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307
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308 Static(Class cls) {
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309 this.cls = cls;
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310 }
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311
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312 @Override public String toString() {
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313 return cls.toString();
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314 }
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315
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316 @Override public Class<?> getDeclaringClass() {
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317 return cls.getDeclaringClass();
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318 }
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319
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320 @Override public String getName() {
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321 return cls.getName();
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322 }
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323
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324 @Override public int getModifiers() {
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325 return cls.getModifiers();
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326 }
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327
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328 @Override public boolean isSynthetic() {
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329 return cls.isSynthetic();
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330 }
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331 }
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332
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333 public static Static getClass(LuanState luan,String name) throws LuanException {
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334 Class cls;
37
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335 try {
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336 cls = Class.forName(name);
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337 } catch(ClassNotFoundException e) {
51
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338 try {
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339 cls = Thread.currentThread().getContextClassLoader().loadClass(name);
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340 } catch(ClassNotFoundException e2) {
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341 return null;
51
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342 }
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343 }
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344 return new Static(cls);
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345 }
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346 /*
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347 public static void importClass(LuanState luan,String name) throws LuanException {
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348 luan.currentEnvironment().put( name.substring(name.lastIndexOf('.')+1), getClass(luan,name) );
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349 }
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350 */
48
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351 static class AmbiguousJavaFunction extends LuanFunction {
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352 private final Map<Integer,List<LuanJavaFunction>> fnMap = new HashMap<Integer,List<LuanJavaFunction>>();
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353
48
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354 AmbiguousJavaFunction(List<LuanJavaFunction> fns) {
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355 for( LuanJavaFunction fn : fns ) {
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356 Integer n = fn.getParameterTypes().length;
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357 List<LuanJavaFunction> list = fnMap.get(n);
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358 if( list==null ) {
48
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359 list = new ArrayList<LuanJavaFunction>();
37
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diff changeset
360 fnMap.put(n,list);
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361 }
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362 list.add(fn);
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363 }
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364 }
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365
112
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diff changeset
366 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
48
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367 for( LuanJavaFunction fn : fnMap.get(args.length) ) {
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368 try {
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369 return fn.rawCall(luan,args);
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370 } catch(IllegalArgumentException e) {}
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371 }
130
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diff changeset
372 throw luan.exception("no method matched args");
37
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373 }
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374 }
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375
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376 private static class InstanceOf {
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377 private final Object obj;
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378
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379 InstanceOf(Object obj) {
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380 this.obj = obj;
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381 }
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382
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383 public boolean instanceOf(Static st) {
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384 return st.cls.isInstance(obj);
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385 }
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386 }
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387 private static final Method instanceOf;
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388 static {
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389 try {
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390 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class);
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391 instanceOf.setAccessible(true);
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392 } catch(NoSuchMethodException e) {
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393 throw new RuntimeException(e);
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394 }
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395 }
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396
61
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diff changeset
397
64
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diff changeset
398 private static class AssertClass {
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diff changeset
399 private final Class cls;
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diff changeset
400
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diff changeset
401 AssertClass(Class cls) {
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diff changeset
402 this.cls = cls;
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diff changeset
403 }
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diff changeset
404
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405 public Object assertClass(LuanState luan,Object v) throws LuanException {
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406 if( !cls.isInstance(v) ) {
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407 String got = v.getClass().getSimpleName();
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408 String expected = cls.getSimpleName();
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409 throw luan.exception("bad argument #1 ("+expected+" expected, got "+got+")");
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410 }
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411 return v;
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412 }
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413 }
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414 private static final Method assertClass;
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415 static {
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416 try {
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417 assertClass = AssertClass.class.getMethod("assertClass",LuanState.class,Object.class);
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418 assertClass.setAccessible(true);
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419 } catch(NoSuchMethodException e) {
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420 throw new RuntimeException(e);
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421 }
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422 }
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423
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424
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425 public static Object proxy(final LuanState luan,Static st,final LuanTable t,final Object base) throws LuanException {
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426 return Proxy.newProxyInstance(
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427 st.cls.getClassLoader(),
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428 new Class[]{st.cls},
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429 new InvocationHandler() {
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430 public Object invoke(Object proxy,Method method, Object[] args)
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431 throws Throwable
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432 {
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433 if( args==null )
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434 args = new Object[0];
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435 String name = method.getName();
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436 Object fnObj = t.get(name);
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437 if( fnObj==null && base!=null )
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438 return method.invoke(base,args);
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439 LuanFunction fn = luan.checkFunction(fnObj);
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440 return Luan.first(luan.call(fn,name,args));
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441 }
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442 }
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443 );
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444 }
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445 }