Mercurial Hosting > luan
annotate src/luan/lib/JavaLib.java @ 40:e3624b7cd603
implement stack trace
git-svn-id: https://luan-java.googlecode.com/svn/trunk@41 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Fri, 21 Dec 2012 10:45:54 +0000 |
parents | 8a57ebfdfd78 |
children | 57054fa43189 |
rev | line source |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1 package luan.lib; |
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2 |
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3 import java.lang.reflect.Array; |
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4 import java.lang.reflect.Member; |
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5 import java.lang.reflect.Field; |
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6 import java.lang.reflect.Method; |
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7 import java.lang.reflect.Constructor; |
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8 import java.lang.reflect.Modifier; |
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9 import java.util.Map; |
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10 import java.util.HashMap; |
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11 import java.util.List; |
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12 import java.util.ArrayList; |
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13 import java.util.Iterator; |
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14 import luan.LuaNumber; |
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15 import luan.LuaState; |
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16 import luan.LuaTable; |
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17 import luan.MetatableGetter; |
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18 import luan.LuaException; |
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19 import luan.LuaFunction; |
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20 import luan.LuaJavaFunction; |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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21 import luan.LuaElement; |
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22 |
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23 |
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24 public final class JavaLib { |
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25 |
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26 public static void register(LuaState lua) { |
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27 lua.addMetatableGetter(mg); |
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28 LuaTable module = new LuaTable(); |
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29 LuaTable global = lua.global(); |
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30 global.put("java",module); |
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31 try { |
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32 global.put( "import", new LuaJavaFunction(JavaLib.class.getMethod("importClass",LuaState.class,String.class),null) ); |
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33 module.put( "class", new LuaJavaFunction(JavaLib.class.getMethod("getClass",LuaState.class,String.class),null) ); |
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34 } catch(NoSuchMethodException e) { |
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35 throw new RuntimeException(e); |
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36 } |
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37 } |
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38 |
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39 private static final LuaTable mt = new LuaTable(); |
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40 static { |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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41 add( mt, "__index", LuaState.class, Object.class, Object.class ); |
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42 } |
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43 |
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44 private static void add(LuaTable t,String method,Class<?>... parameterTypes) { |
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45 try { |
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46 t.put( method, new LuaJavaFunction(JavaLib.class.getMethod(method,parameterTypes),null) ); |
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47 } catch(NoSuchMethodException e) { |
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48 throw new RuntimeException(e); |
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49 } |
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50 } |
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51 |
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52 private static final MetatableGetter mg = new MetatableGetter() { |
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53 public LuaTable getMetatable(Object obj) { |
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54 if( obj==null ) |
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55 return null; |
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56 return mt; |
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57 } |
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58 }; |
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59 |
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60 public static Object __index(LuaState lua,Object obj,Object key) throws LuaException { |
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61 if( obj instanceof Static ) { |
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62 if( key instanceof String ) { |
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63 String name = (String)key; |
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64 Static st = (Static)obj; |
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65 Class cls = st.cls; |
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66 if( "class".equals(name) ) { |
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67 return cls; |
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68 } else if( "new".equals(name) ) { |
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69 Constructor<?>[] constructors = cls.getConstructors(); |
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70 if( constructors.length > 0 ) { |
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71 if( constructors.length==1 ) { |
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72 return new LuaJavaFunction(constructors[0],null); |
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73 } else { |
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74 List<LuaJavaFunction> fns = new ArrayList<LuaJavaFunction>(); |
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75 for( Constructor constructor : constructors ) { |
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76 fns.add(new LuaJavaFunction(constructor,null)); |
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77 } |
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78 return new AmbiguousJavaFunction(fns); |
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79 } |
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80 } |
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81 } else { |
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82 List<Member> members = getStaticMembers(cls,name); |
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83 if( !members.isEmpty() ) { |
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84 return member(null,members); |
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85 } |
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86 } |
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87 } |
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88 throw new LuaException(lua,LuaElement.JAVA,"invalid index for java class: "+key); |
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89 } |
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90 Class cls = obj.getClass(); |
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91 if( cls.isArray() ) { |
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92 if( "length".equals(key) ) { |
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93 return Array.getLength(obj); |
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94 } |
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95 if( key instanceof LuaNumber ) { |
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96 LuaNumber n = (LuaNumber)key; |
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97 double d = n.value(); |
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98 int i = (int)d; |
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99 if( d==i ) { |
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100 return Array.get(obj,i); |
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101 } |
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102 } |
40
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103 throw new LuaException(lua,LuaElement.JAVA,"invalid index for java array: "+key); |
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104 } |
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105 if( key instanceof String ) { |
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106 String name = (String)key; |
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107 if( "instanceof".equals(name) ) { |
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108 return new LuaJavaFunction(instanceOf,new InstanceOf(obj)); |
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109 } else { |
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110 List<Member> members = getMembers(cls,name); |
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111 if( !members.isEmpty() ) { |
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112 return member(obj,members); |
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113 } |
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114 } |
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115 } |
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116 throw new LuaException(lua,LuaElement.JAVA,"invalid index for java object: "+key); |
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117 } |
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118 |
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119 private static Object member(Object obj,List<Member> members) throws LuaException { |
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120 try { |
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121 if( members.size()==1 ) { |
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122 Member member = members.get(0); |
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123 if( member instanceof Field ) { |
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124 Field field = (Field)member; |
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125 Object value = field.get(obj); |
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126 if( value instanceof Number ) { |
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127 Number n = (Number)value; |
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128 value = new LuaNumber(n.doubleValue()); |
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129 } |
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130 return value; |
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131 } else { |
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132 Method method = (Method)member; |
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133 return new LuaJavaFunction(method,obj); |
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134 } |
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135 } else { |
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136 List<LuaJavaFunction> fns = new ArrayList<LuaJavaFunction>(); |
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137 for( Member member : members ) { |
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138 Method method = (Method)member; |
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139 fns.add(new LuaJavaFunction(method,obj)); |
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140 } |
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141 return new AmbiguousJavaFunction(fns); |
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142 } |
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143 } catch(IllegalAccessException e) { |
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144 throw new RuntimeException(e); |
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145 } |
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146 } |
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147 |
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148 private static Map<Class,Map<String,List<Member>>> memberMap = new HashMap<Class,Map<String,List<Member>>>(); |
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149 |
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150 private static synchronized List<Member> getMembers(Class cls,String name) { |
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151 Map<String,List<Member>> clsMap = memberMap.get(cls); |
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152 if( clsMap == null ) { |
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153 clsMap = new HashMap<String,List<Member>>(); |
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154 for( Field field : cls.getFields() ) { |
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155 String s = field.getName(); |
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156 List<Member> list = clsMap.get(s); |
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157 if( list == null ) { |
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158 list = new ArrayList<Member>(); |
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159 clsMap.put(s,list); |
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160 } |
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161 list.add(field); |
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162 } |
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163 for( Method method : cls.getMethods() ) { |
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164 String s = method.getName(); |
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165 List<Member> list = clsMap.get(s); |
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166 if( list == null ) { |
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167 list = new ArrayList<Member>(); |
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168 clsMap.put(s,list); |
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169 } |
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170 list.add(method); |
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171 } |
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172 memberMap.put(cls,clsMap); |
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173 } |
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174 return clsMap.get(name); |
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175 } |
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176 |
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177 private static synchronized List<Member> getStaticMembers(Class cls,String name) { |
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178 List<Member> staticMembers = new ArrayList<Member>(); |
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179 for( Member m : getMembers(cls,name) ) { |
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180 if( Modifier.isStatic(m.getModifiers()) ) |
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181 staticMembers.add(m); |
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182 } |
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183 return staticMembers; |
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184 } |
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185 |
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186 static class Static { |
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187 final Class cls; |
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188 |
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189 Static(Class cls) { |
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190 this.cls = cls; |
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191 } |
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192 } |
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193 |
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194 public static Static getClass(LuaState lua,String name) throws LuaException { |
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195 try { |
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196 return new Static( Class.forName(name) ); |
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197 } catch(ClassNotFoundException e) { |
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198 throw new LuaException(lua,LuaElement.JAVA,e); |
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199 } |
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200 } |
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201 |
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202 public static void importClass(LuaState lua,String name) throws LuaException { |
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203 lua.global().put( name.substring(name.lastIndexOf('.')+1), getClass(lua,name) ); |
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204 } |
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205 |
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206 static class AmbiguousJavaFunction extends LuaFunction { |
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207 private final Map<Integer,List<LuaJavaFunction>> fnMap = new HashMap<Integer,List<LuaJavaFunction>>(); |
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208 |
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209 AmbiguousJavaFunction(List<LuaJavaFunction> fns) { |
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210 for( LuaJavaFunction fn : fns ) { |
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211 Integer n = fn.getParameterTypes().length; |
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212 List<LuaJavaFunction> list = fnMap.get(n); |
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213 if( list==null ) { |
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214 list = new ArrayList<LuaJavaFunction>(); |
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215 fnMap.put(n,list); |
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216 } |
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217 list.add(fn); |
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218 } |
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219 } |
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220 |
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221 @Override public Object[] call(LuaState lua,Object[] args) throws LuaException { |
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222 for( LuaJavaFunction fn : fnMap.get(args.length) ) { |
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223 try { |
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224 return fn.call(lua,args); |
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225 } catch(IllegalArgumentException e) {} |
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226 } |
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227 throw new LuaException(lua,LuaElement.JAVA,"no method matched args"); |
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228 } |
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229 } |
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230 |
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231 private static class InstanceOf { |
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232 private final Object obj; |
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233 |
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234 InstanceOf(Object obj) { |
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235 this.obj = obj; |
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236 } |
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237 |
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238 public boolean instanceOf(Static st) { |
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239 return st.cls.isInstance(obj); |
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240 } |
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241 } |
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242 private static final Method instanceOf; |
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243 static { |
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244 try { |
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245 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class); |
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246 instanceOf.setAccessible(true); |
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247 } catch(NoSuchMethodException e) { |
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248 throw new RuntimeException(e); |
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249 } |
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250 } |
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251 |
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252 } |