Mercurial Hosting > luan
annotate src/luan/lib/JavaLib.java @ 51:28dfd91a816c
various small issues
git-svn-id: https://luan-java.googlecode.com/svn/trunk@52 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Fri, 28 Dec 2012 20:43:06 +0000 |
parents | 272b6f1d7dac |
children | 9381b23ea9e1 |
rev | line source |
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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.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.util.Map; |
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11 import java.util.HashMap; |
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12 import java.util.List; |
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13 import java.util.ArrayList; |
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14 import java.util.Iterator; |
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15 import luan.Luan; |
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16 import luan.LuanState; |
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17 import luan.LuanTable; |
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18 import luan.MetatableGetter; |
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19 import luan.LuanException; |
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20 import luan.LuanFunction; |
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21 import luan.LuanJavaFunction; |
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22 import luan.LuanElement; |
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23 |
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24 |
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25 public final class JavaLib { |
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26 |
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27 public static void register(LuanState luan) { |
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28 luan.addMetatableGetter(mg); |
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29 LuanTable module = new LuanTable(); |
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30 LuanTable global = luan.global(); |
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31 global.put("java",module); |
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32 try { |
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33 global.put( "import", new LuanJavaFunction(JavaLib.class.getMethod("importClass",LuanState.class,String.class),null) ); |
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34 module.put( "class", new LuanJavaFunction(JavaLib.class.getMethod("getClass",LuanState.class,String.class),null) ); |
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35 } catch(NoSuchMethodException e) { |
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36 throw new RuntimeException(e); |
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37 } |
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38 } |
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39 |
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40 private static final LuanTable mt = new LuanTable(); |
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41 static { |
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42 add( mt, "__index", LuanState.class, Object.class, Object.class ); |
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43 } |
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44 |
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45 private static void add(LuanTable t,String method,Class<?>... parameterTypes) { |
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46 try { |
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47 t.put( method, new LuanJavaFunction(JavaLib.class.getMethod(method,parameterTypes),null) ); |
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48 } catch(NoSuchMethodException e) { |
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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 LuanTable 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(LuanState luan,Object obj,Object key) throws LuanException { |
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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 LuanJavaFunction(constructors[0],null); |
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74 } else { |
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75 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>(); |
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76 for( Constructor constructor : constructors ) { |
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77 fns.add(new LuanJavaFunction(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<AccessibleObject> 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 LuanException(luan,LuanElement.JAVA,"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 Integer i = Luan.asInteger(key); |
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97 if( i != null ) { |
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98 return Array.get(obj,i); |
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99 } |
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100 throw new LuanException(luan,LuanElement.JAVA,"invalid index for java array: "+key); |
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101 } |
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102 if( key instanceof String ) { |
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103 String name = (String)key; |
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104 if( "instanceof".equals(name) ) { |
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105 return new LuanJavaFunction(instanceOf,new InstanceOf(obj)); |
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106 } else { |
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107 List<AccessibleObject> members = getMembers(cls,name); |
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108 if( !members.isEmpty() ) { |
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109 return member(obj,members); |
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110 } |
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111 } |
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112 } |
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113 throw new LuanException(luan,LuanElement.JAVA,"invalid index for java object: "+key); |
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114 } |
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115 |
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116 private static Object member(Object obj,List<AccessibleObject> members) throws LuanException { |
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117 try { |
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118 for( AccessibleObject m : members ) { |
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119 m.setAccessible(true); |
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120 } |
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121 if( members.size()==1 ) { |
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122 AccessibleObject 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 return field.get(obj); |
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126 } else { |
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127 Method method = (Method)member; |
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128 return new LuanJavaFunction(method,obj); |
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129 } |
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130 } else { |
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131 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>(); |
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132 for( AccessibleObject member : members ) { |
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133 Method method = (Method)member; |
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134 fns.add(new LuanJavaFunction(method,obj)); |
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135 } |
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136 return new AmbiguousJavaFunction(fns); |
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137 } |
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138 } catch(IllegalAccessException e) { |
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139 throw new RuntimeException(e); |
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140 } |
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141 } |
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142 |
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143 private static Map<Class,Map<String,List<AccessibleObject>>> memberMap = new HashMap<Class,Map<String,List<AccessibleObject>>>(); |
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144 |
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145 private static synchronized List<AccessibleObject> getMembers(Class cls,String name) { |
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146 Map<String,List<AccessibleObject>> clsMap = memberMap.get(cls); |
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147 if( clsMap == null ) { |
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148 clsMap = new HashMap<String,List<AccessibleObject>>(); |
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149 for( Field field : cls.getFields() ) { |
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150 String s = field.getName(); |
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151 List<AccessibleObject> list = clsMap.get(s); |
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152 if( list == null ) { |
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153 list = new ArrayList<AccessibleObject>(); |
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154 clsMap.put(s,list); |
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155 } |
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156 list.add(field); |
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157 } |
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158 for( Method method : cls.getMethods() ) { |
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159 String s = method.getName(); |
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160 List<AccessibleObject> list = clsMap.get(s); |
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161 if( list == null ) { |
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162 list = new ArrayList<AccessibleObject>(); |
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163 clsMap.put(s,list); |
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164 } |
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165 list.add(method); |
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166 } |
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167 memberMap.put(cls,clsMap); |
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168 } |
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169 return clsMap.get(name); |
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170 } |
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171 |
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172 private static synchronized List<AccessibleObject> getStaticMembers(Class cls,String name) { |
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173 List<AccessibleObject> staticMembers = new ArrayList<AccessibleObject>(); |
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174 for( AccessibleObject m : getMembers(cls,name) ) { |
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175 if( Modifier.isStatic(((Member)m).getModifiers()) ) |
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176 staticMembers.add(m); |
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177 } |
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178 return staticMembers; |
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179 } |
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180 |
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181 static class Static { |
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182 final Class cls; |
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183 |
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184 Static(Class cls) { |
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185 this.cls = cls; |
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186 } |
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187 } |
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188 |
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189 public static Static getClass(LuanState luan,String name) throws LuanException { |
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190 Class cls; |
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191 try { |
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192 cls = Class.forName(name); |
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193 } catch(ClassNotFoundException e) { |
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194 try { |
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195 cls = Thread.currentThread().getContextClassLoader().loadClass(name); |
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196 } catch(ClassNotFoundException e2) { |
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197 throw new LuanException(luan,LuanElement.JAVA,e); |
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198 } |
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199 } |
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200 return new Static(cls); |
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201 } |
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202 |
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203 public static void importClass(LuanState luan,String name) throws LuanException { |
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204 luan.global().put( name.substring(name.lastIndexOf('.')+1), getClass(luan,name) ); |
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205 } |
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206 |
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207 static class AmbiguousJavaFunction extends LuanFunction { |
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208 private final Map<Integer,List<LuanJavaFunction>> fnMap = new HashMap<Integer,List<LuanJavaFunction>>(); |
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209 |
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210 AmbiguousJavaFunction(List<LuanJavaFunction> fns) { |
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211 for( LuanJavaFunction fn : fns ) { |
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212 Integer n = fn.getParameterTypes().length; |
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213 List<LuanJavaFunction> list = fnMap.get(n); |
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214 if( list==null ) { |
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215 list = new ArrayList<LuanJavaFunction>(); |
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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(LuanState luan,Object[] args) throws LuanException { |
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223 for( LuanJavaFunction fn : fnMap.get(args.length) ) { |
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224 try { |
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225 return fn.call(luan,args); |
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226 } catch(IllegalArgumentException e) {} |
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227 } |
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228 throw new LuanException(luan,LuanElement.JAVA,"no method matched args"); |
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229 } |
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230 } |
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231 |
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232 private static class InstanceOf { |
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233 private final Object obj; |
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234 |
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235 InstanceOf(Object obj) { |
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236 this.obj = obj; |
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237 } |
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238 |
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239 public boolean instanceOf(Static st) { |
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240 return st.cls.isInstance(obj); |
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241 } |
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242 } |
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243 private static final Method instanceOf; |
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244 static { |
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245 try { |
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246 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class); |
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247 instanceOf.setAccessible(true); |
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248 } catch(NoSuchMethodException e) { |
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249 throw new RuntimeException(e); |
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250 } |
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251 } |
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252 |
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253 } |