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annotate core/src/luan/modules/JavaLuan.java @ 502:d3183a330ff5

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improve the __index metamethod to work with any type; simplify luan_proxy to eliminate base;
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 19 May 2015 17:57:20 -0600
parents 34a4ed3597ea
children 92c3d22745b8
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rev   line source
167
4c0131c2b650 merge luan/lib into modules
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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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1de3e4a6e82d remove LuanJavaFunction.RTN_NUMBER_ARRAY;
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18 import java.util.Arrays;
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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
301
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30 public static void java(LuanState luan) throws LuanException {
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31 check(luan,luan.currentSource().name);
300
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32 luan.currentEnvironment().setJava();
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33 }
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34
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35 public static final LuanFunction javaFn;
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36 static {
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37 try {
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38 javaFn = new LuanJavaFunction(JavaLuan.class.getMethod("java",LuanState.class),null);
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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 }
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43
300
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44 private static void checkJava(LuanState luan) throws LuanException {
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45 if( !luan.currentEnvironment().hasJava() )
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46 throw luan.exception("Java isn't allowed");
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47 }
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48
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49 public static Object __index(LuanState luan,Object obj,Object key) throws LuanException {
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50 checkJava(luan);
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51 if( obj instanceof Static ) {
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52 if( key instanceof String ) {
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53 String name = (String)key;
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54 Static st = (Static)obj;
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55 Class cls = st.cls;
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56 if( "class".equals(name) ) {
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57 return cls;
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58 } else if( "new".equals(name) ) {
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59 Constructor[] constructors = cls.getConstructors();
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60 if( constructors.length > 0 ) {
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61 if( constructors.length==1 ) {
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62 return new LuanJavaFunction(constructors[0],null);
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63 } else {
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64 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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65 for( Constructor constructor : constructors ) {
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66 fns.add(new LuanJavaFunction(constructor,null));
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67 }
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68 return new AmbiguousJavaFunction(fns);
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69 }
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70 }
304
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71 /*
208
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72 } else if( "assert".equals(name) ) {
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73 return new LuanJavaFunction(assertClass,new AssertClass(cls));
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74 */
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75 } else if( "luan_proxy".equals(name) ) {
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76 return new LuanJavaFunction(luan_proxyMethod,st);
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77 } else {
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78 List<Member> members = getStaticMembers(cls,name);
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79 if( !members.isEmpty() ) {
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80 return member(null,members);
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81 }
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82 }
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83 }
208
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84 throw luan.exception("invalid member '"+key+"' for: "+obj);
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85 }
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86 Class cls = obj.getClass();
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87 if( cls.isArray() ) {
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88 if( "length".equals(key) ) {
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89 return Array.getLength(obj);
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90 }
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91 Integer i = Luan.asInteger(key);
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92 if( i != null ) {
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93 return Array.get(obj,i);
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94 }
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95 throw luan.exception("invalid member '"+key+"' for java array: "+obj);
37
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96 }
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97 if( key instanceof String ) {
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98 String name = (String)key;
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99 if( "instanceof".equals(name) ) {
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100 return new LuanJavaFunction(instanceOf,new InstanceOf(obj));
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101 } else {
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102 List<Member> members = getMembers(cls,name);
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103 if( !members.isEmpty() ) {
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104 return member(obj,members);
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105 }
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106 }
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107 }
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108 // throw luan.exception("invalid member '"+key+"' for java object: "+obj);
297
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109 //System.out.println("invalid member '"+key+"' for java object: "+obj);
208
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110 return null;
37
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111 }
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112
56
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113 private static Object member(Object obj,List<Member> members) throws LuanException {
37
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114 try {
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115 if( members.size()==1 ) {
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116 Member member = members.get(0);
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117 if( member instanceof Static ) {
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118 return member;
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119 } else if( member instanceof Field ) {
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120 Field field = (Field)member;
157
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121 Object rtn = field.get(obj);
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122 return rtn instanceof Object[] ? Arrays.asList((Object[])rtn) : rtn;
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123 } else {
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124 Method method = (Method)member;
297
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125 return new LuanJavaFunction(method,obj);
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126 }
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127 } else {
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128 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
56
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129 for( Member member : members ) {
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130 Method method = (Method)member;
297
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131 fns.add(new LuanJavaFunction(method,obj));
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132 }
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133 return new AmbiguousJavaFunction(fns);
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134 }
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135 } catch(IllegalAccessException e) {
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136 throw new RuntimeException(e);
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137 }
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138 }
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139
428
df95199ca4c0 rename __newindex to __new_index
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140 public static void __new_index(LuanState luan,Object obj,Object key,Object value) throws LuanException {
421
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141 checkJava(luan);
60
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142 if( obj instanceof Static ) {
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143 if( key instanceof String ) {
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144 String name = (String)key;
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145 Static st = (Static)obj;
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146 Class cls = st.cls;
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147 List<Member> members = getStaticMembers(cls,name);
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148 if( !members.isEmpty() ) {
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149 if( members.size() != 1 )
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150 throw new RuntimeException("not field '"+name+"' of "+obj);
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151 setMember(obj,members,value);
421
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152 return;
60
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153 }
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154 }
130
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155 throw luan.exception("invalid member '"+key+"' for: "+obj);
60
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156 }
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157 Class cls = obj.getClass();
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158 if( cls.isArray() ) {
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159 Integer i = Luan.asInteger(key);
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160 if( i != null ) {
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161 Array.set(obj,i,value);
421
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162 return;
60
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163 }
130
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164 throw luan.exception("invalid member '"+key+"' for java array: "+obj);
60
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165 }
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166 if( key instanceof String ) {
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167 String name = (String)key;
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168 List<Member> members = getMembers(cls,name);
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169 if( !members.isEmpty() ) {
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170 if( members.size() != 1 )
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171 throw new RuntimeException("not field '"+name+"' of "+obj);
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172 setMember(obj,members,value);
421
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173 return;
60
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174 }
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175 }
130
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diff changeset
176 throw luan.exception("invalid member '"+key+"' for java object: "+obj);
60
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177 }
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178
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diff changeset
179 private static void setMember(Object obj,List<Member> members,Object value) {
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180 Field field = (Field)members.get(0);
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diff changeset
181 try {
100
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diff changeset
182 try {
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183 field.set(obj,value);
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diff changeset
184 } catch(IllegalArgumentException e) {
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diff changeset
185 Class cls = field.getType();
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diff changeset
186 if( value instanceof Number ) {
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diff changeset
187 Number n = (Number)value;
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188 if( cls.equals(Integer.TYPE) || cls.equals(Integer.class) ) {
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diff changeset
189 int r = n.intValue();
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diff changeset
190 if( r==n.doubleValue() ) {
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diff changeset
191 field.setInt(obj,r);
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192 return;
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diff changeset
193 }
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diff changeset
194 }
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diff changeset
195 }
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diff changeset
196 throw e;
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diff changeset
197 }
60
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diff changeset
198 } catch(IllegalAccessException e) {
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diff changeset
199 throw new RuntimeException(e);
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200 }
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201 }
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202
102
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203 public static boolean privateAccess = false;
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204 private static Map<Class,Map<String,List<Member>>> memberMap = new HashMap<Class,Map<String,List<Member>>>();
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205
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206 private static synchronized List<Member> getMembers(Class cls,String name) {
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207 Map<String,List<Member>> clsMap = memberMap.get(cls);
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208 if( clsMap == null ) {
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209 clsMap = new HashMap<String,List<Member>>();
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210 for( Class c : cls.getClasses() ) {
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211 String s = c.getSimpleName();
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212 List<Member> list = new ArrayList<Member>();
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213 clsMap.put(s,list);
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214 list.add(new Static(c));
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215 }
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216 for( Field field : cls.getFields() ) {
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217 String s = field.getName();
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218 try {
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219 if( !cls.getField(s).equals(field) )
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220 continue; // not accessible
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221 } catch(NoSuchFieldException e) {
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222 throw new RuntimeException(e);
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223 }
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224 List<Member> list = new ArrayList<Member>();
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225 clsMap.put(s,list);
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226 list.add(field);
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227 }
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228 for( Method method : cls.getMethods() ) {
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229 String s = method.getName();
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230 List<Member> list = clsMap.get(s);
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231 if( list == null || !(list.get(0) instanceof Method) ) {
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232 list = new ArrayList<Member>();
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233 clsMap.put(s,list);
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234 }
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235 list.add(method);
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236 }
102
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237 if( privateAccess ) {
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238 for( Method method : cls.getDeclaredMethods() ) {
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239 String s = method.getName();
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240 List<Member> list = clsMap.get(s);
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241 if( list == null ) {
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242 list = new ArrayList<Member>();
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243 clsMap.put(s,list);
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244 } else if( !(list.get(0) instanceof Method) )
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245 continue;
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246 if( !list.contains(method) ) {
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247 list.add(method);
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248 }
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249 }
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250 for( Field field : cls.getDeclaredFields() ) {
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251 String s = field.getName();
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252 List<Member> list = clsMap.get(s);
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253 if( list == null ) {
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254 list = new ArrayList<Member>();
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255 clsMap.put(s,list);
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256 list.add(field);
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257 }
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258 }
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259 }
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260 for( List<Member> members : clsMap.values() ) {
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261 for( Member m : members ) {
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262 if( m instanceof AccessibleObject )
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263 ((AccessibleObject)m).setAccessible(true);
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264 }
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265 }
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266 memberMap.put(cls,clsMap);
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267 }
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268 List<Member> rtn = clsMap.get(name);
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269 if( rtn==null )
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270 rtn = Collections.emptyList();
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271 return rtn;
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272 }
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273
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274 private static synchronized List<Member> getStaticMembers(Class cls,String name) {
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275 List<Member> staticMembers = new ArrayList<Member>();
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276 for( Member m : getMembers(cls,name) ) {
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277 if( Modifier.isStatic(m.getModifiers()) )
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278 staticMembers.add(m);
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279 }
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280 return staticMembers;
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281 }
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282
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283 static final class Static implements Member {
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284 final Class cls;
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285
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286 Static(Class cls) {
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287 this.cls = cls;
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288 }
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289
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290 @Override public String toString() {
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291 return cls.toString();
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292 }
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293
437
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294 @Override public Class getDeclaringClass() {
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295 return cls.getDeclaringClass();
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296 }
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297
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298 @Override public String getName() {
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299 return cls.getName();
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300 }
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301
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302 @Override public int getModifiers() {
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303 return cls.getModifiers();
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304 }
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305
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306 @Override public boolean isSynthetic() {
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307 return cls.isSynthetic();
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308 }
304
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309
502
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310 public Object luan_proxy(final LuanState luan,final LuanTable t) throws LuanException {
304
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311 return Proxy.newProxyInstance(
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312 cls.getClassLoader(),
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313 new Class[]{cls},
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314 new InvocationHandler() {
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315 public Object invoke(Object proxy,Method method, Object[] args)
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316 throws Throwable
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317 {
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318 if( args==null )
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319 args = new Object[0];
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320 String name = method.getName();
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321 Object fnObj = t.get(luan,name);
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322 if( fnObj == null )
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323 throw new NullPointerException("luan_proxy couldn't find method '"+name+"'");
304
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324 LuanFunction fn = luan.checkFunction(fnObj);
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325 return Luan.first(luan.call(fn,name,args));
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326 }
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327 }
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diff changeset
328 );
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329 }
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330 }
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331 private static final Method luan_proxyMethod;
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332 static {
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333 try {
502
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334 luan_proxyMethod = Static.class.getMethod("luan_proxy",LuanState.class,LuanTable.class);
304
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335 luan_proxyMethod.setAccessible(true);
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diff changeset
336 } catch(NoSuchMethodException e) {
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337 throw new RuntimeException(e);
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diff changeset
338 }
37
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339 }
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340
299
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diff changeset
341 public static Static load(LuanState luan,String name) throws LuanException {
300
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diff changeset
342 checkJava(luan);
51
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diff changeset
343 Class cls;
37
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344 try {
51
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345 cls = Class.forName(name);
37
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346 } catch(ClassNotFoundException e) {
51
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diff changeset
347 try {
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diff changeset
348 cls = Thread.currentThread().getContextClassLoader().loadClass(name);
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diff changeset
349 } catch(ClassNotFoundException e2) {
108
3c404a296995 make Package module more standard;
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diff changeset
350 return null;
51
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diff changeset
351 }
37
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352 }
51
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diff changeset
353 return new Static(cls);
37
8a57ebfdfd78 add JavaLib
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354 }
300
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355
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diff changeset
356 private static class AmbiguousJavaFunction extends LuanFunction {
48
64ecb7a3aad7 rename Lua to Luan
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diff changeset
357 private final Map<Integer,List<LuanJavaFunction>> fnMap = new HashMap<Integer,List<LuanJavaFunction>>();
37
8a57ebfdfd78 add JavaLib
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358
48
64ecb7a3aad7 rename Lua to Luan
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diff changeset
359 AmbiguousJavaFunction(List<LuanJavaFunction> fns) {
64ecb7a3aad7 rename Lua to Luan
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diff changeset
360 for( LuanJavaFunction fn : fns ) {
37
8a57ebfdfd78 add JavaLib
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diff changeset
361 Integer n = fn.getParameterTypes().length;
48
64ecb7a3aad7 rename Lua to Luan
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diff changeset
362 List<LuanJavaFunction> list = fnMap.get(n);
37
8a57ebfdfd78 add JavaLib
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diff changeset
363 if( list==null ) {
48
64ecb7a3aad7 rename Lua to Luan
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diff changeset
364 list = new ArrayList<LuanJavaFunction>();
37
8a57ebfdfd78 add JavaLib
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diff changeset
365 fnMap.put(n,list);
8a57ebfdfd78 add JavaLib
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diff changeset
366 }
8a57ebfdfd78 add JavaLib
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diff changeset
367 list.add(fn);
8a57ebfdfd78 add JavaLib
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diff changeset
368 }
8a57ebfdfd78 add JavaLib
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diff changeset
369 }
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diff changeset
370
112
f5af13062b10 fix previous rev
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parents: 108
diff changeset
371 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
48
64ecb7a3aad7 rename Lua to Luan
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diff changeset
372 for( LuanJavaFunction fn : fnMap.get(args.length) ) {
37
8a57ebfdfd78 add JavaLib
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diff changeset
373 try {
55
9381b23ea9e1 various fixes
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diff changeset
374 return fn.rawCall(luan,args);
37
8a57ebfdfd78 add JavaLib
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parents:
diff changeset
375 } catch(IllegalArgumentException e) {}
8a57ebfdfd78 add JavaLib
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diff changeset
376 }
402
62b457c50594 add stripe;
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diff changeset
377 throw luan.exception("no method matched args: "+Arrays.asList(args));
37
8a57ebfdfd78 add JavaLib
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diff changeset
378 }
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379 }
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parents:
diff changeset
380
8a57ebfdfd78 add JavaLib
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diff changeset
381 private static class InstanceOf {
8a57ebfdfd78 add JavaLib
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parents:
diff changeset
382 private final Object obj;
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diff changeset
383
8a57ebfdfd78 add JavaLib
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parents:
diff changeset
384 InstanceOf(Object obj) {
8a57ebfdfd78 add JavaLib
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parents:
diff changeset
385 this.obj = obj;
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diff changeset
386 }
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parents:
diff changeset
387
8a57ebfdfd78 add JavaLib
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diff changeset
388 public boolean instanceOf(Static st) {
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parents:
diff changeset
389 return st.cls.isInstance(obj);
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diff changeset
390 }
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parents:
diff changeset
391 }
8a57ebfdfd78 add JavaLib
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parents:
diff changeset
392 private static final Method instanceOf;
8a57ebfdfd78 add JavaLib
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parents:
diff changeset
393 static {
8a57ebfdfd78 add JavaLib
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parents:
diff changeset
394 try {
8a57ebfdfd78 add JavaLib
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parents:
diff changeset
395 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class);
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parents:
diff changeset
396 instanceOf.setAccessible(true);
8a57ebfdfd78 add JavaLib
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parents:
diff changeset
397 } catch(NoSuchMethodException e) {
8a57ebfdfd78 add JavaLib
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parents:
diff changeset
398 throw new RuntimeException(e);
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parents:
diff changeset
399 }
8a57ebfdfd78 add JavaLib
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parents:
diff changeset
400 }
8a57ebfdfd78 add JavaLib
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parents:
diff changeset
401
304
03e9cda4748d add JavaLuan.Static.luan_proxy()
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parents: 301
diff changeset
402 /*
64
177cfdc2bdb3 add type assertions
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parents: 63
diff changeset
403 private static class AssertClass {
177cfdc2bdb3 add type assertions
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parents: 63
diff changeset
404 private final Class cls;
177cfdc2bdb3 add type assertions
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parents: 63
diff changeset
405
177cfdc2bdb3 add type assertions
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parents: 63
diff changeset
406 AssertClass(Class cls) {
177cfdc2bdb3 add type assertions
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parents: 63
diff changeset
407 this.cls = cls;
177cfdc2bdb3 add type assertions
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parents: 63
diff changeset
408 }
177cfdc2bdb3 add type assertions
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parents: 63
diff changeset
409
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410 public Object assertClass(LuanState luan,Object v) throws LuanException {
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411 if( !cls.isInstance(v) ) {
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412 String got = v.getClass().getSimpleName();
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413 String expected = cls.getSimpleName();
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414 throw luan.exception("bad argument #1 ("+expected+" expected, got "+got+")");
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415 }
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416 return v;
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417 }
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418 }
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419 private static final Method assertClass;
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420 static {
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421 try {
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422 assertClass = AssertClass.class.getMethod("assertClass",LuanState.class,Object.class);
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423 assertClass.setAccessible(true);
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424 } catch(NoSuchMethodException e) {
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425 throw new RuntimeException(e);
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426 }
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427 }
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428
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429
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430 public static Object proxy(final LuanState luan,Static st,final LuanTable t,final Object base) throws LuanException {
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431 return Proxy.newProxyInstance(
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432 st.cls.getClassLoader(),
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433 new Class[]{st.cls},
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434 new InvocationHandler() {
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435 public Object invoke(Object proxy,Method method, Object[] args)
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436 throws Throwable
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437 {
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438 if( args==null )
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439 args = new Object[0];
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440 String name = method.getName();
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441 Object fnObj = t.get(name);
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442 if( fnObj==null && base!=null )
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443 return method.invoke(base,args);
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444 LuanFunction fn = luan.checkFunction(fnObj);
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445 return Luan.first(luan.call(fn,name,args));
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446 }
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447 }
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448 );
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449 }
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450 */
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451
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452
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453
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454 // security
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455
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456 public interface Security {
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457 public void check(LuanState luan,String name) throws LuanException;
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458 }
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459
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460 private static String SECURITY_KEY = "Java.Security";
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461
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462 private static void check(LuanState luan,String name) throws LuanException {
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463 Security s = (Security)luan.registry().get(SECURITY_KEY);
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464 if( s!=null )
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465 s.check(luan,name);
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466 }
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467
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468 public static void setSecurity(LuanState luan,Security s) {
433
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469 luan.registry().put(SECURITY_KEY,s);
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470 }
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471
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472 }