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annotate src/luan/LuanJavaFunction.java @ 86:6db8f286fa6c
_ENV is per module, not global
git-svn-id: https://luan-java.googlecode.com/svn/trunk@87 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Wed, 27 Feb 2013 08:03:51 +0000 |
parents | aeedefd3e3f3 |
children | 6ca02b188dba |
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1
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1 package luan; |
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2 |
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3 import java.lang.reflect.Array; |
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4 import java.lang.reflect.Method; |
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5 import java.lang.reflect.Constructor; |
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6 import java.lang.reflect.InvocationTargetException; |
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7 import java.util.List; |
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8 import java.util.Map; |
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9 import java.util.Set; |
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10 import java.util.Arrays; |
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11 |
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12 |
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13 public final class LuanJavaFunction extends LuanFunction { |
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14 private final JavaMethod method; |
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15 private final Object obj; |
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16 private final RtnConverter rtnConverter; |
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17 private final boolean takesLuaState; |
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18 private final ArgConverter[] argConverters; |
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19 private final Class<?> varArgCls; |
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20 |
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21 public LuanJavaFunction(Method method,Object obj) { |
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22 this( JavaMethod.of(method), obj ); |
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23 } |
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24 |
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25 public LuanJavaFunction(Constructor constr,Object obj) { |
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26 this( JavaMethod.of(constr), obj ); |
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27 } |
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28 |
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29 LuanJavaFunction(JavaMethod method,Object obj) { |
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30 this.method = method; |
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31 this.obj = obj; |
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32 this.rtnConverter = getRtnConverter(method); |
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33 this.takesLuaState = takesLuaState(method); |
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34 this.argConverters = getArgConverters(takesLuaState,method); |
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35 if( method.isVarArgs() ) { |
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36 Class<?>[] paramTypes = method.getParameterTypes(); |
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37 this.varArgCls = paramTypes[paramTypes.length-1].getComponentType(); |
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38 } else { |
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39 this.varArgCls = null; |
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40 } |
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41 } |
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42 |
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43 @Override public String toString() { |
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44 return "java-function: " + method; |
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45 } |
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46 |
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47 public Class<?>[] getParameterTypes() { |
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48 return method.getParameterTypes(); |
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49 } |
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50 |
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51 @Override public Object[] call(LuanState luan,Object[] args) throws LuanException { |
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52 args = fixArgs(luan,args); |
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53 try { |
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54 return doCall(luan,args); |
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55 } catch(IllegalArgumentException e) { |
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56 checkArgs(luan,args); |
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57 throw e; |
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58 } |
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59 } |
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60 |
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61 public Object[] rawCall(LuanState luan,Object[] args) throws LuanException { |
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62 args = fixArgs(luan,args); |
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63 return doCall(luan,args); |
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64 } |
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65 |
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66 private Object[] doCall(LuanState luan,Object[] args) throws LuanException { |
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67 Object rtn; |
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68 try { |
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69 rtn = method.invoke(obj,args); |
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70 } catch(IllegalAccessException e) { |
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71 throw new RuntimeException(e); |
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72 } catch(InvocationTargetException e) { |
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73 Throwable cause = e.getCause(); |
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74 if( cause instanceof Error ) |
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75 throw (Error)cause; |
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76 if( cause instanceof RuntimeException ) |
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77 throw new LuanException(luan,LuanElement.JAVA,cause); |
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78 if( cause instanceof LuanException ) |
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79 throw (LuanException)cause; |
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80 throw new RuntimeException(e); |
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81 } catch(InstantiationException e) { |
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82 throw new RuntimeException(e); |
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83 } |
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84 return rtnConverter.convert(rtn); |
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85 } |
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86 |
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87 private void checkArgs(LuanState luan,Object[] args) throws LuanException { |
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88 Class<?>[] a = getParameterTypes(); |
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89 int start = takesLuaState ? 1 : 0; |
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90 for( int i=start; i<a.length; i++ ) { |
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91 Class<?> paramType = a[i]; |
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92 Object arg = args[i]; |
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93 if( !paramType.isInstance(arg) ) { |
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94 String expected = paramType.getSimpleName(); |
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95 if( arg==null ) { |
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96 if( paramType.isPrimitive() ) |
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97 throw new LuanException(luan,LuanElement.JAVA,"bad argument #"+(i+1-start)+" ("+expected+" expected, got nil)"); |
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98 } else { |
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99 String got = arg.getClass().getSimpleName(); |
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100 throw new LuanException(luan,LuanElement.JAVA,"bad argument #"+(i+1-start)+" ("+expected+" expected, got "+got+")"); |
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101 } |
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102 } |
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103 } |
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104 } |
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105 |
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106 private Object[] fixArgs(LuanState luan,Object[] args) { |
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107 int n = argConverters.length; |
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108 Object[] rtn; |
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109 int start = 0; |
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110 if( !takesLuaState && varArgCls==null && args.length == n ) { |
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111 rtn = args; |
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112 } else { |
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113 if( takesLuaState ) |
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114 n++; |
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115 rtn = new Object[n]; |
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116 if( takesLuaState ) { |
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117 rtn[start++] = luan; |
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118 } |
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119 n = argConverters.length; |
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120 if( varArgCls != null ) { |
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121 n--; |
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122 if( args.length < argConverters.length ) { |
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123 rtn[rtn.length-1] = Array.newInstance(varArgCls,0); |
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124 } else { |
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125 int len = args.length - n; |
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126 Object varArgs = Array.newInstance(varArgCls,len); |
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127 ArgConverter ac = argConverters[n]; |
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128 for( int i=0; i<len; i++ ) { |
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129 Array.set( varArgs, i, ac.convert(args[n+i]) ); |
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130 } |
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131 rtn[rtn.length-1] = varArgs; |
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132 } |
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133 } |
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134 System.arraycopy(args,0,rtn,start,Math.min(args.length,n)); |
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135 } |
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136 for( int i=0; i<n; i++ ) { |
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137 rtn[start+i] = argConverters[i].convert(rtn[start+i]); |
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138 } |
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139 return rtn; |
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140 } |
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141 |
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142 |
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143 private interface RtnConverter { |
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144 public Object[] convert(Object obj); |
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145 } |
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146 |
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147 private static final RtnConverter RTN_EMPTY = new RtnConverter() { |
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148 public Object[] convert(Object obj) { |
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149 return EMPTY; |
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150 } |
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151 }; |
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152 |
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153 private static final RtnConverter RTN_ARRAY = new RtnConverter() { |
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154 public Object[] convert(Object obj) { |
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155 if( obj == null ) |
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156 return NULL_RTN; |
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157 return (Object[])obj; |
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158 } |
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159 }; |
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160 |
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161 private static final RtnConverter RTN_ONE = new RtnConverter() { |
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162 public Object[] convert(Object obj) { |
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163 return new Object[]{obj}; |
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164 } |
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165 }; |
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166 |
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167 private static final Object[] NULL_RTN = new Object[1]; |
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168 |
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169 private static final RtnConverter RTN_NUMBER_ARRAY = new RtnConverter() { |
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170 public Object[] convert(Object obj) { |
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171 if( obj == null ) |
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172 return NULL_RTN; |
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173 Object[] rtn = new Object[Array.getLength(obj)]; |
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174 for( int i=0; i<rtn.length; i++ ) { |
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175 rtn[i] = Array.get(obj,i); |
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176 } |
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177 return rtn; |
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178 } |
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179 }; |
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180 |
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181 private static RtnConverter getRtnConverter(JavaMethod m) { |
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182 Class<?> rtnType = m.getReturnType(); |
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183 if( rtnType == Void.TYPE ) |
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184 return RTN_EMPTY; |
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185 if( rtnType.isArray() ) { |
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186 rtnType = rtnType.getComponentType(); |
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187 if( isNumber(rtnType) ) |
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188 return RTN_NUMBER_ARRAY; |
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189 return RTN_ARRAY; |
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190 } |
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191 return RTN_ONE; |
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192 } |
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193 |
47
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194 private static boolean isNumber(Class<?> rtnType) { |
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195 return rtnType == Byte.TYPE |
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196 || rtnType == Short.TYPE |
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197 || rtnType == Integer.TYPE |
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198 || rtnType == Long.TYPE |
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199 || rtnType == Float.TYPE |
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200 || rtnType == Double.TYPE |
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201 ; |
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202 } |
1
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203 |
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204 private interface ArgConverter { |
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205 public Object convert(Object obj); |
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206 } |
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207 |
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208 private static final ArgConverter ARG_SAME = new ArgConverter() { |
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209 public Object convert(Object obj) { |
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210 return obj; |
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211 } |
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212 }; |
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213 |
47
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214 private static final ArgConverter ARG_DOUBLE = new ArgConverter() { |
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215 public Object convert(Object obj) { |
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216 if( obj instanceof Double ) |
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217 return obj; |
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218 if( obj instanceof Number ) { |
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219 Number n = (Number)obj; |
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220 return n.doubleValue(); |
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221 } |
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222 if( obj instanceof String ) { |
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223 String s = (String)obj; |
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224 try { |
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225 return Double.valueOf(s); |
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226 } catch(NumberFormatException e) {} |
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227 } |
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228 return obj; |
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229 } |
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230 }; |
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231 |
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232 private static final ArgConverter ARG_FLOAT = new ArgConverter() { |
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233 public Object convert(Object obj) { |
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234 if( obj instanceof Float ) |
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235 return obj; |
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236 if( obj instanceof Number ) { |
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237 Number n = (Number)obj; |
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238 float r = n.floatValue(); |
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239 if( r==n.doubleValue() ) |
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240 return r; |
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241 } |
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242 if( obj instanceof String ) { |
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243 String s = (String)obj; |
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244 try { |
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245 return Float.valueOf(s); |
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246 } catch(NumberFormatException e) {} |
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247 } |
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248 return obj; |
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249 } |
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250 }; |
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251 |
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252 private static final ArgConverter ARG_LONG = new ArgConverter() { |
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253 public Object convert(Object obj) { |
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254 if( obj instanceof Long ) |
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255 return obj; |
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256 if( obj instanceof Number ) { |
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257 Number n = (Number)obj; |
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258 long r = n.longValue(); |
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259 if( r==n.doubleValue() ) |
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260 return r; |
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261 } |
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262 else if( obj instanceof String ) { |
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263 String s = (String)obj; |
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264 try { |
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265 return Long.valueOf(s); |
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266 } catch(NumberFormatException e) {} |
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267 } |
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268 return obj; |
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269 } |
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270 }; |
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271 |
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272 private static final ArgConverter ARG_INTEGER = new ArgConverter() { |
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273 public Object convert(Object obj) { |
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274 if( obj instanceof Integer ) |
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275 return obj; |
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276 if( obj instanceof Number ) { |
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277 Number n = (Number)obj; |
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278 int r = n.intValue(); |
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279 if( r==n.doubleValue() ) |
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280 return r; |
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281 } |
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282 else if( obj instanceof String ) { |
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283 String s = (String)obj; |
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284 try { |
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285 return Integer.valueOf(s); |
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286 } catch(NumberFormatException e) {} |
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287 } |
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288 return obj; |
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289 } |
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290 }; |
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291 |
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292 private static final ArgConverter ARG_SHORT = new ArgConverter() { |
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293 public Object convert(Object obj) { |
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294 if( obj instanceof Short ) |
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295 return obj; |
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296 if( obj instanceof Number ) { |
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297 Number n = (Number)obj; |
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298 short r = n.shortValue(); |
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299 if( r==n.doubleValue() ) |
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300 return r; |
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301 } |
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302 else if( obj instanceof String ) { |
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303 String s = (String)obj; |
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304 try { |
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305 return Short.valueOf(s); |
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306 } catch(NumberFormatException e) {} |
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307 } |
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308 return obj; |
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309 } |
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310 }; |
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311 |
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312 private static final ArgConverter ARG_BYTE = new ArgConverter() { |
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313 public Object convert(Object obj) { |
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314 if( obj instanceof Byte ) |
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315 return obj; |
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316 if( obj instanceof Number ) { |
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317 Number n = (Number)obj; |
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318 byte r = n.byteValue(); |
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319 if( r==n.doubleValue() ) |
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320 return r; |
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321 } |
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322 else if( obj instanceof String ) { |
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323 String s = (String)obj; |
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324 try { |
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325 return Byte.valueOf(s); |
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326 } catch(NumberFormatException e) {} |
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327 } |
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328 return obj; |
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329 } |
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330 }; |
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331 |
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332 private static final ArgConverter ARG_TABLE = new ArgConverter() { |
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333 public Object convert(Object obj) { |
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334 if( obj == null ) |
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335 return null; |
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336 if( obj instanceof List ) { |
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337 @SuppressWarnings("unchecked") |
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338 List<Object> list = (List<Object>)obj; |
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339 return new LuanTable(list); |
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340 } |
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341 if( obj instanceof Map ) { |
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342 @SuppressWarnings("unchecked") |
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343 Map<Object,Object> map = (Map<Object,Object>)obj; |
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344 return new LuanTable(map); |
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345 } |
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346 if( obj instanceof Set ) { |
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347 @SuppressWarnings("unchecked") |
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348 Set<Object> set = (Set<Object>)obj; |
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349 return new LuanTable(set); |
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350 } |
55
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351 Class cls = obj.getClass(); |
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352 if( cls.isArray() && !cls.getComponentType().isPrimitive() ) { |
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353 Object[] a = (Object[])obj; |
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354 return new LuanTable(Arrays.asList(a)); |
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355 } |
47
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356 return obj; |
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357 } |
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358 }; |
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359 |
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360 private static final ArgConverter ARG_MAP = new ArgConverter() { |
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361 public Object convert(Object obj) { |
48
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362 if( obj instanceof LuanTable ) { |
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363 LuanTable t = (LuanTable)obj; |
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364 return t.asMap(); |
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365 } |
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366 return obj; |
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367 } |
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368 }; |
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369 |
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370 private static final ArgConverter ARG_LIST = new ArgConverter() { |
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371 public Object convert(Object obj) { |
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372 if( obj instanceof LuanTable ) { |
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373 LuanTable t = (LuanTable)obj; |
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374 if( t.isList() ) |
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375 return t.asList(); |
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376 } |
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377 return obj; |
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378 } |
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379 }; |
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380 |
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381 private static final ArgConverter ARG_SET = new ArgConverter() { |
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382 public Object convert(Object obj) { |
48
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383 if( obj instanceof LuanTable ) { |
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384 LuanTable t = (LuanTable)obj; |
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385 if( t.isSet() ) |
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386 return t.asSet(); |
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387 } |
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388 return obj; |
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389 } |
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390 }; |
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391 |
57
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392 private static class ArgArray implements ArgConverter { |
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393 private final Object[] a; |
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394 |
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395 ArgArray(Class cls) { |
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396 a = (Object[])Array.newInstance(cls.getComponentType(),0); |
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397 } |
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398 |
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399 public Object convert(Object obj) { |
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400 if( obj instanceof LuanTable ) { |
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401 LuanTable t = (LuanTable)obj; |
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402 if( t.isList() ) { |
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403 try { |
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404 return t.asList().toArray(a); |
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405 } catch(ArrayStoreException e) {} |
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406 } |
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407 } |
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408 return obj; |
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409 } |
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410 } |
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411 |
37
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412 private static boolean takesLuaState(JavaMethod m) { |
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413 Class<?>[] paramTypes = m.getParameterTypes(); |
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414 return paramTypes.length > 0 && paramTypes[0].equals(LuanState.class); |
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415 } |
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416 |
37
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417 private static ArgConverter[] getArgConverters(boolean takesLuaState,JavaMethod m) { |
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418 final boolean isVarArgs = m.isVarArgs(); |
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419 Class<?>[] paramTypes = m.getParameterTypes(); |
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420 if( takesLuaState ) { |
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421 Class<?>[] t = new Class<?>[paramTypes.length-1]; |
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422 System.arraycopy(paramTypes,1,t,0,t.length); |
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423 paramTypes = t; |
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424 } |
1
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425 ArgConverter[] a = new ArgConverter[paramTypes.length]; |
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426 for( int i=0; i<a.length; i++ ) { |
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427 Class<?> paramType = paramTypes[i]; |
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428 if( isVarArgs && i == a.length-1 ) |
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429 paramType = paramType.getComponentType(); |
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|
430 a[i] = getArgConverter(paramType); |
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431 } |
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432 return a; |
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|
433 } |
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|
434 |
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|
435 private static ArgConverter getArgConverter(Class<?> cls) { |
47
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436 if( cls == Double.TYPE || cls.equals(Double.class) ) |
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437 return ARG_DOUBLE; |
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438 if( cls == Float.TYPE || cls.equals(Float.class) ) |
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439 return ARG_FLOAT; |
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440 if( cls == Long.TYPE || cls.equals(Long.class) ) |
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441 return ARG_LONG; |
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442 if( cls == Integer.TYPE || cls.equals(Integer.class) ) |
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443 return ARG_INTEGER; |
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444 if( cls == Short.TYPE || cls.equals(Short.class) ) |
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445 return ARG_SHORT; |
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446 if( cls == Byte.TYPE || cls.equals(Byte.class) ) |
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447 return ARG_BYTE; |
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448 if( cls.equals(LuanTable.class) ) |
47
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449 return ARG_TABLE; |
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450 if( cls.equals(Map.class) ) |
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451 return ARG_MAP; |
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452 if( cls.equals(List.class) ) |
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453 return ARG_LIST; |
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454 if( cls.equals(Set.class) ) |
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455 return ARG_SET; |
57
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456 if( cls.isArray() && !cls.getComponentType().isPrimitive() ) |
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457 return new ArgArray(cls); |
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458 return ARG_SAME; |
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459 } |
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|
460 |
37
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|
461 |
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|
462 |
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463 private static abstract class JavaMethod { |
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464 abstract boolean isVarArgs(); |
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465 abstract Class<?>[] getParameterTypes(); |
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466 abstract Object invoke(Object obj,Object... args) |
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467 throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, InstantiationException; |
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468 abstract Class<?> getReturnType(); |
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|
469 |
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470 static JavaMethod of(final Method m) { |
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471 return new JavaMethod() { |
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472 @Override boolean isVarArgs() { |
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473 return m.isVarArgs(); |
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474 } |
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475 @Override Class<?>[] getParameterTypes() { |
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476 return m.getParameterTypes(); |
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477 } |
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478 @Override Object invoke(Object obj,Object... args) |
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479 throws IllegalAccessException, IllegalArgumentException, InvocationTargetException |
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480 { |
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481 return m.invoke(obj,args); |
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482 } |
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483 @Override Class<?> getReturnType() { |
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484 return m.getReturnType(); |
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485 } |
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486 @Override public String toString() { |
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487 return m.toString(); |
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488 } |
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489 }; |
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490 } |
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491 |
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492 static JavaMethod of(final Constructor c) { |
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493 return new JavaMethod() { |
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494 @Override boolean isVarArgs() { |
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495 return c.isVarArgs(); |
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496 } |
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497 @Override Class<?>[] getParameterTypes() { |
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498 return c.getParameterTypes(); |
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499 } |
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500 @Override Object invoke(Object obj,Object... args) |
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501 throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, InstantiationException |
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502 { |
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503 return c.newInstance(args); |
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504 } |
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505 @Override Class<?> getReturnType() { |
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506 return c.getDeclaringClass(); |
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507 } |
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508 @Override public String toString() { |
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509 return c.toString(); |
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510 } |
37
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511 }; |
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512 } |
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513 |
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514 } |
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515 |
1
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start Luan
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516 } |