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annotate src/luan/lib/JavaLib.java @ 37:8a57ebfdfd78
add JavaLib
git-svn-id: https://luan-java.googlecode.com/svn/trunk@38 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Thu, 20 Dec 2012 02:36:07 +0000 |
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children | e3624b7cd603 |
rev | line source |
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37
8a57ebfdfd78
add JavaLib
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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21 |
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22 |
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23 public final class JavaLib { |
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24 |
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25 public static void register(LuaState lua) { |
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26 lua.addMetatableGetter(mg); |
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27 LuaTable module = new LuaTable(); |
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28 LuaTable global = lua.global(); |
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29 global.put("java",module); |
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30 try { |
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31 global.put( "import", new LuaJavaFunction(JavaLib.class.getMethod("importClass",LuaState.class,String.class),null) ); |
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32 module.put( "class", new LuaJavaFunction(JavaLib.class.getMethod("getClass",String.class),null) ); |
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33 } catch(NoSuchMethodException e) { |
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34 throw new RuntimeException(e); |
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35 } |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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36 add( global, "ipairs", Object.class ); |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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37 add( global, "pairs", Object.class ); |
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38 } |
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39 |
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40 private static final LuaTable mt = new LuaTable(); |
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41 static { |
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42 add( mt, "__index", Object.class, Object.class ); |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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43 } |
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44 |
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45 private static void add(LuaTable t,String method,Class<?>... parameterTypes) { |
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46 try { |
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47 t.put( method, new LuaJavaFunction(JavaLib.class.getMethod(method,parameterTypes),null) ); |
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48 } catch(NoSuchMethodException e) { |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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49 throw new RuntimeException(e); |
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50 } |
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51 } |
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52 |
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53 private static final MetatableGetter mg = new MetatableGetter() { |
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54 public LuaTable getMetatable(Object obj) { |
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55 if( obj==null ) |
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56 return null; |
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57 return mt; |
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58 } |
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59 }; |
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60 |
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61 public static Object __index(Object obj,Object key) throws LuaException { |
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62 if( obj instanceof Static ) { |
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63 if( key instanceof String ) { |
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64 String name = (String)key; |
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65 Static st = (Static)obj; |
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66 Class cls = st.cls; |
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67 if( "class".equals(name) ) { |
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68 return cls; |
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69 } else if( "new".equals(name) ) { |
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70 Constructor<?>[] constructors = cls.getConstructors(); |
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71 if( constructors.length > 0 ) { |
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72 if( constructors.length==1 ) { |
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73 return new LuaJavaFunction(constructors[0],null); |
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74 } else { |
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75 List<LuaJavaFunction> fns = new ArrayList<LuaJavaFunction>(); |
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76 for( Constructor constructor : constructors ) { |
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77 fns.add(new LuaJavaFunction(constructor,null)); |
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78 } |
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79 return new AmbiguousJavaFunction(fns); |
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80 } |
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81 } |
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82 } else { |
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83 List<Member> members = getStaticMembers(cls,name); |
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84 if( !members.isEmpty() ) { |
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85 return member(null,members); |
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86 } |
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87 } |
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88 } |
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89 throw new LuaException("invalid index for java class: "+key); |
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90 } |
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91 Class cls = obj.getClass(); |
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92 if( cls.isArray() ) { |
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93 if( "length".equals(key) ) { |
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94 return Array.getLength(obj); |
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95 } |
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96 if( key instanceof LuaNumber ) { |
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97 LuaNumber n = (LuaNumber)key; |
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98 double d = n.value(); |
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99 int i = (int)d; |
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100 if( d==i ) { |
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101 return Array.get(obj,i); |
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102 } |
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103 } |
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104 throw new LuaException("invalid index for java array: "+key); |
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105 } |
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106 if( key instanceof String ) { |
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107 String name = (String)key; |
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108 if( "instanceof".equals(name) ) { |
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109 return new LuaJavaFunction(instanceOf,new InstanceOf(obj)); |
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110 } else { |
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111 List<Member> members = getMembers(cls,name); |
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112 if( !members.isEmpty() ) { |
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113 return member(obj,members); |
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114 } |
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115 } |
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116 } |
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117 throw new LuaException("invalid index for java object: "+key); |
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118 } |
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119 |
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120 private static Object member(Object obj,List<Member> members) throws LuaException { |
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121 try { |
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122 if( members.size()==1 ) { |
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123 Member member = members.get(0); |
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124 if( member instanceof Field ) { |
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125 Field field = (Field)member; |
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126 Object value = field.get(obj); |
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127 if( value instanceof Number ) { |
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128 Number n = (Number)value; |
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129 value = new LuaNumber(n.doubleValue()); |
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130 } |
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131 return value; |
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132 } else { |
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133 Method method = (Method)member; |
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134 return new LuaJavaFunction(method,obj); |
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135 } |
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136 } else { |
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137 List<LuaJavaFunction> fns = new ArrayList<LuaJavaFunction>(); |
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138 for( Member member : members ) { |
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139 Method method = (Method)member; |
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140 fns.add(new LuaJavaFunction(method,obj)); |
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141 } |
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142 return new AmbiguousJavaFunction(fns); |
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143 } |
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144 } catch(IllegalAccessException e) { |
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145 throw new RuntimeException(e); |
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146 } |
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147 } |
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148 |
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149 private static Map<Class,Map<String,List<Member>>> memberMap = new HashMap<Class,Map<String,List<Member>>>(); |
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150 |
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151 private static synchronized List<Member> getMembers(Class cls,String name) { |
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152 Map<String,List<Member>> clsMap = memberMap.get(cls); |
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153 if( clsMap == null ) { |
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154 clsMap = new HashMap<String,List<Member>>(); |
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155 for( Field field : cls.getFields() ) { |
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156 String s = field.getName(); |
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157 List<Member> list = clsMap.get(s); |
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158 if( list == null ) { |
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159 list = new ArrayList<Member>(); |
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160 clsMap.put(s,list); |
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161 } |
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162 list.add(field); |
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163 } |
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164 for( Method method : cls.getMethods() ) { |
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165 String s = method.getName(); |
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166 List<Member> list = clsMap.get(s); |
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167 if( list == null ) { |
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168 list = new ArrayList<Member>(); |
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169 clsMap.put(s,list); |
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170 } |
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171 list.add(method); |
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172 } |
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173 memberMap.put(cls,clsMap); |
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174 } |
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175 return clsMap.get(name); |
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176 } |
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177 |
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178 private static synchronized List<Member> getStaticMembers(Class cls,String name) { |
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179 List<Member> staticMembers = new ArrayList<Member>(); |
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180 for( Member m : getMembers(cls,name) ) { |
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181 if( Modifier.isStatic(m.getModifiers()) ) |
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182 staticMembers.add(m); |
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183 } |
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184 return staticMembers; |
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185 } |
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186 |
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187 static class Static { |
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188 final Class cls; |
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189 |
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190 Static(Class cls) { |
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191 this.cls = cls; |
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192 } |
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193 } |
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194 |
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195 public static Static getClass(String name) throws LuaException { |
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196 try { |
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197 return new Static( Class.forName(name) ); |
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198 } catch(ClassNotFoundException e) { |
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199 throw new LuaException(e); |
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200 } |
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201 } |
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202 |
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203 public static void importClass(LuaState lua,String name) throws LuaException { |
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204 lua.global().put( name.substring(name.lastIndexOf('.')+1), getClass(name) ); |
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205 } |
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206 |
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207 static class AmbiguousJavaFunction extends LuaFunction { |
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208 private final Map<Integer,List<LuaJavaFunction>> fnMap = new HashMap<Integer,List<LuaJavaFunction>>(); |
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209 |
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210 AmbiguousJavaFunction(List<LuaJavaFunction> fns) { |
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211 for( LuaJavaFunction fn : fns ) { |
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212 Integer n = fn.getParameterTypes().length; |
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213 List<LuaJavaFunction> list = fnMap.get(n); |
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214 if( list==null ) { |
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215 list = new ArrayList<LuaJavaFunction>(); |
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216 fnMap.put(n,list); |
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217 } |
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218 list.add(fn); |
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219 } |
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220 } |
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221 |
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222 @Override public Object[] call(LuaState lua,Object... args) throws LuaException { |
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223 for( LuaJavaFunction fn : fnMap.get(args.length) ) { |
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224 try { |
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225 return fn.call(lua,args); |
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226 } catch(IllegalArgumentException e) {} |
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227 } |
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228 throw new LuaException("no method matched args"); |
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229 } |
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230 } |
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231 |
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232 |
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233 public static LuaFunction pairs(Object t) throws LuaException { |
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234 if( t instanceof LuaTable ) |
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235 return BasicLib.pairs((LuaTable)t); |
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236 if( t instanceof Map ) { |
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237 @SuppressWarnings("unchecked") |
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238 Map<Object,Object> m = (Map<Object,Object>)t; |
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239 return BasicLib.pairs(m.entrySet().iterator()); |
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240 } |
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241 throw new LuaException( "bad argument #1 to 'pairs' (table or Map expected)" ); |
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242 } |
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243 |
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244 private static class Iter { |
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245 private final Iterator iter; |
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246 private double i = 0.0; |
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247 |
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248 Iter(Iterable t) { |
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249 this.iter = t.iterator(); |
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250 } |
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251 |
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252 public Object[] next() { |
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253 if( !iter.hasNext() ) |
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254 return LuaFunction.EMPTY_RTN ; |
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255 return new Object[]{ new LuaNumber(i++), iter.next() }; |
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256 } |
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257 } |
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258 private static final Method nextIter; |
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259 static { |
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260 try { |
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261 nextIter = Iter.class.getMethod("next"); |
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262 nextIter.setAccessible(true); |
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263 } catch(NoSuchMethodException e) { |
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264 throw new RuntimeException(e); |
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265 } |
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266 } |
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267 |
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268 public static LuaFunction ipairs(Object t) throws LuaException { |
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269 if( t instanceof LuaTable ) |
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270 return BasicLib.ipairs((LuaTable)t); |
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271 if( t instanceof Iterable ) { |
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272 Iter ai = new Iter((Iterable)t); |
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273 return new LuaJavaFunction(nextIter,ai); |
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274 } |
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275 throw new LuaException( "bad argument #1 to 'ipairs' (table or Iterable expected)" ); |
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276 } |
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277 |
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278 |
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279 private static class InstanceOf { |
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280 private final Object obj; |
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281 |
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282 InstanceOf(Object obj) { |
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283 this.obj = obj; |
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284 } |
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285 |
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286 public boolean instanceOf(Static st) { |
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287 return st.cls.isInstance(obj); |
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288 } |
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289 } |
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290 private static final Method instanceOf; |
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291 static { |
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292 try { |
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293 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class); |
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294 instanceOf.setAccessible(true); |
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295 } catch(NoSuchMethodException e) { |
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296 throw new RuntimeException(e); |
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297 } |
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298 } |
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299 |
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300 } |