Mercurial Hosting > luan
annotate src/luan/LuanJavaFunction.java @ 57:19ca9c4c6c7f
auto-convert table to java array
git-svn-id: https://luan-java.googlecode.com/svn/trunk@58 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Sun, 06 Jan 2013 19:17:56 +0000 |
parents | c84274b18f0c |
children | a68ccb7aaa9c |
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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 public Class<?>[] getParameterTypes() { |
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44 return method.getParameterTypes(); |
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45 } |
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46 |
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47 @Override public Object[] call(LuanState luan,Object[] args) throws LuanException { |
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48 try { |
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49 return rawCall(luan,args); |
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50 } catch(IllegalArgumentException e) { |
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51 checkArgs(luan,args); |
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52 throw e; |
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53 } |
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54 } |
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55 |
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56 public Object[] rawCall(LuanState luan,Object[] args) throws LuanException { |
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57 args = fixArgs(luan,args); |
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58 Object rtn; |
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59 try { |
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60 rtn = method.invoke(obj,args); |
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61 } catch(IllegalAccessException e) { |
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62 throw new RuntimeException(e); |
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63 } catch(InvocationTargetException e) { |
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64 Throwable cause = e.getCause(); |
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65 if( cause instanceof Error ) |
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66 throw (Error)cause; |
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67 if( cause instanceof RuntimeException ) |
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68 throw new LuanException(luan,LuanElement.JAVA,cause); |
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69 if( cause instanceof LuanException ) |
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70 throw (LuanException)cause; |
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71 throw new RuntimeException(e); |
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72 } catch(InstantiationException e) { |
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73 throw new RuntimeException(e); |
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74 } |
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75 return rtnConverter.convert(rtn); |
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76 } |
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77 |
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78 private void checkArgs(LuanState luan,Object[] args) throws LuanException { |
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79 Class<?>[] a = getParameterTypes(); |
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80 for( int i=0; i<a.length; i++ ) { |
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81 if( !a[i].isInstance(args[i]) ) { |
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82 String got = args[i].getClass().getName(); |
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83 String expected = a[i].getName(); |
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84 if( !takesLuaState ) |
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85 i++; |
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86 throw new LuanException(luan,LuanElement.JAVA,"bad argument #"+i+" ("+expected+" expected, got "+got+")"); |
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87 } |
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88 } |
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89 } |
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90 |
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91 private Object[] fixArgs(LuanState luan,Object[] args) { |
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92 int n = argConverters.length; |
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93 Object[] rtn; |
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94 int start = 0; |
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95 if( !takesLuaState && varArgCls==null && args.length == n ) { |
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96 rtn = args; |
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97 } else { |
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98 if( takesLuaState ) |
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99 n++; |
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100 rtn = new Object[n]; |
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101 if( takesLuaState ) { |
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102 rtn[start++] = luan; |
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103 } |
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104 n = argConverters.length; |
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105 if( varArgCls != null ) { |
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106 n--; |
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107 if( args.length < argConverters.length ) { |
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108 rtn[rtn.length-1] = Array.newInstance(varArgCls,0); |
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109 } else { |
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110 int len = args.length - n; |
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111 Object varArgs = Array.newInstance(varArgCls,len); |
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112 ArgConverter ac = argConverters[n]; |
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113 for( int i=0; i<len; i++ ) { |
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114 Array.set( varArgs, i, ac.convert(args[n+i]) ); |
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115 } |
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116 rtn[rtn.length-1] = varArgs; |
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117 } |
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118 } |
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119 System.arraycopy(args,0,rtn,start,Math.min(args.length,n)); |
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120 } |
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121 for( int i=0; i<n; i++ ) { |
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122 rtn[start+i] = argConverters[i].convert(rtn[start+i]); |
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123 } |
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124 return rtn; |
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125 } |
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126 |
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127 |
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128 private interface RtnConverter { |
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129 public Object[] convert(Object obj); |
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130 } |
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131 |
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132 private static final RtnConverter RTN_EMPTY = new RtnConverter() { |
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133 public Object[] convert(Object obj) { |
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134 return EMPTY_RTN; |
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135 } |
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136 }; |
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137 |
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138 private static final RtnConverter RTN_ARRAY = new RtnConverter() { |
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139 public Object[] convert(Object obj) { |
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140 if( obj == null ) |
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141 return NULL_RTN; |
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142 return (Object[])obj; |
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143 } |
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144 }; |
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145 |
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146 private static final RtnConverter RTN_ONE = new RtnConverter() { |
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147 public Object[] convert(Object obj) { |
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148 return new Object[]{obj}; |
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149 } |
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150 }; |
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151 |
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152 private static final Object[] NULL_RTN = new Object[1]; |
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153 |
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154 private static final RtnConverter RTN_NUMBER_ARRAY = new RtnConverter() { |
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155 public Object[] convert(Object obj) { |
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156 if( obj == null ) |
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157 return NULL_RTN; |
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158 Object[] rtn = new Object[Array.getLength(obj)]; |
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159 for( int i=0; i<rtn.length; i++ ) { |
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160 rtn[i] = Array.get(obj,i); |
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161 } |
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162 return rtn; |
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163 } |
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164 }; |
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165 |
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166 private static RtnConverter getRtnConverter(JavaMethod m) { |
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167 Class<?> rtnType = m.getReturnType(); |
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168 if( rtnType == Void.TYPE ) |
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169 return RTN_EMPTY; |
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170 if( rtnType.isArray() ) { |
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171 rtnType = rtnType.getComponentType(); |
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172 if( isNumber(rtnType) ) |
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173 return RTN_NUMBER_ARRAY; |
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174 return RTN_ARRAY; |
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175 } |
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176 return RTN_ONE; |
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177 } |
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178 |
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179 private static boolean isNumber(Class<?> rtnType) { |
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180 return rtnType == Byte.TYPE |
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181 || rtnType == Short.TYPE |
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182 || rtnType == Integer.TYPE |
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183 || rtnType == Long.TYPE |
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184 || rtnType == Float.TYPE |
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185 || rtnType == Double.TYPE |
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186 ; |
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187 } |
1
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188 |
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189 private interface ArgConverter { |
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190 public Object convert(Object obj); |
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191 } |
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192 |
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193 private static final ArgConverter ARG_SAME = new ArgConverter() { |
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194 public Object convert(Object obj) { |
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195 return obj; |
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196 } |
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197 }; |
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198 |
47
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199 private static final ArgConverter ARG_DOUBLE = new ArgConverter() { |
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200 public Object convert(Object obj) { |
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201 if( obj instanceof Double ) |
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202 return obj; |
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203 if( obj instanceof Number ) { |
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204 Number n = (Number)obj; |
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205 return n.doubleValue(); |
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206 } |
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207 if( obj instanceof String ) { |
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208 String s = (String)obj; |
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209 try { |
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210 return Double.valueOf(s); |
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211 } catch(NumberFormatException e) {} |
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212 } |
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213 return obj; |
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214 } |
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215 }; |
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216 |
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217 private static final ArgConverter ARG_FLOAT = new ArgConverter() { |
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218 public Object convert(Object obj) { |
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219 if( obj instanceof Float ) |
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220 return obj; |
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221 if( obj instanceof Number ) { |
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222 Number n = (Number)obj; |
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223 float r = n.floatValue(); |
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224 if( r==n.doubleValue() ) |
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225 return r; |
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226 } |
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227 if( obj instanceof String ) { |
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228 String s = (String)obj; |
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229 try { |
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230 return Float.valueOf(s); |
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231 } catch(NumberFormatException e) {} |
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232 } |
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233 return obj; |
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234 } |
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235 }; |
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236 |
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237 private static final ArgConverter ARG_LONG = new ArgConverter() { |
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238 public Object convert(Object obj) { |
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239 if( obj instanceof Long ) |
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240 return obj; |
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241 if( obj instanceof Number ) { |
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242 Number n = (Number)obj; |
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243 long r = n.longValue(); |
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244 if( r==n.doubleValue() ) |
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245 return r; |
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246 } |
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247 else if( obj instanceof String ) { |
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248 String s = (String)obj; |
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249 try { |
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250 return Long.valueOf(s); |
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251 } catch(NumberFormatException e) {} |
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252 } |
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253 return obj; |
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254 } |
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255 }; |
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256 |
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257 private static final ArgConverter ARG_INTEGER = new ArgConverter() { |
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258 public Object convert(Object obj) { |
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259 if( obj instanceof Integer ) |
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260 return obj; |
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261 if( obj instanceof Number ) { |
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262 Number n = (Number)obj; |
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263 int r = n.intValue(); |
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264 if( r==n.doubleValue() ) |
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265 return r; |
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266 } |
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267 else if( obj instanceof String ) { |
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268 String s = (String)obj; |
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269 try { |
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270 return Integer.valueOf(s); |
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271 } catch(NumberFormatException e) {} |
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272 } |
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273 return obj; |
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274 } |
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275 }; |
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276 |
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277 private static final ArgConverter ARG_SHORT = new ArgConverter() { |
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278 public Object convert(Object obj) { |
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279 if( obj instanceof Short ) |
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280 return obj; |
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281 if( obj instanceof Number ) { |
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282 Number n = (Number)obj; |
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283 short r = n.shortValue(); |
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284 if( r==n.doubleValue() ) |
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285 return r; |
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286 } |
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287 else if( obj instanceof String ) { |
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288 String s = (String)obj; |
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289 try { |
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290 return Short.valueOf(s); |
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291 } catch(NumberFormatException e) {} |
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292 } |
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293 return obj; |
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294 } |
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295 }; |
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296 |
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297 private static final ArgConverter ARG_BYTE = new ArgConverter() { |
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298 public Object convert(Object obj) { |
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299 if( obj instanceof Byte ) |
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300 return obj; |
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301 if( obj instanceof Number ) { |
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302 Number n = (Number)obj; |
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303 byte r = n.byteValue(); |
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304 if( r==n.doubleValue() ) |
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305 return r; |
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306 } |
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307 else if( obj instanceof String ) { |
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308 String s = (String)obj; |
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309 try { |
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310 return Byte.valueOf(s); |
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311 } catch(NumberFormatException e) {} |
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312 } |
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313 return obj; |
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314 } |
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315 }; |
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316 |
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317 private static final ArgConverter ARG_TABLE = new ArgConverter() { |
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318 public Object convert(Object obj) { |
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319 if( obj instanceof List ) { |
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320 @SuppressWarnings("unchecked") |
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321 List<Object> list = (List<Object>)obj; |
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322 return new LuanTable(list); |
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323 } |
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324 if( obj instanceof Map ) { |
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325 @SuppressWarnings("unchecked") |
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326 Map<Object,Object> map = (Map<Object,Object>)obj; |
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327 return new LuanTable(map); |
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328 } |
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329 if( obj instanceof Set ) { |
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330 @SuppressWarnings("unchecked") |
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331 Set<Object> set = (Set<Object>)obj; |
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332 return new LuanTable(set); |
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333 } |
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334 Class cls = obj.getClass(); |
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335 if( cls.isArray() && !cls.getComponentType().isPrimitive() ) { |
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336 Object[] a = (Object[])obj; |
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337 return new LuanTable(Arrays.asList(a)); |
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338 } |
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339 return obj; |
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340 } |
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341 }; |
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342 |
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343 private static final ArgConverter ARG_MAP = new ArgConverter() { |
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344 public Object convert(Object obj) { |
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345 if( obj instanceof LuanTable ) { |
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346 LuanTable t = (LuanTable)obj; |
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347 return t.asMap(); |
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348 } |
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349 return obj; |
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350 } |
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351 }; |
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352 |
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353 private static final ArgConverter ARG_LIST = new ArgConverter() { |
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354 public Object convert(Object obj) { |
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355 if( obj instanceof LuanTable ) { |
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356 LuanTable t = (LuanTable)obj; |
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357 if( t.isList() ) |
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358 return t.asList(); |
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359 } |
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360 return obj; |
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361 } |
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362 }; |
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363 |
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364 private static final ArgConverter ARG_SET = new ArgConverter() { |
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365 public Object convert(Object obj) { |
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366 if( obj instanceof LuanTable ) { |
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367 LuanTable t = (LuanTable)obj; |
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368 if( t.isSet() ) |
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369 return t.asSet(); |
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370 } |
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371 return obj; |
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372 } |
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373 }; |
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374 |
57
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375 private static class ArgArray implements ArgConverter { |
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376 private final Object[] a; |
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377 |
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378 ArgArray(Class cls) { |
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379 a = (Object[])Array.newInstance(cls.getComponentType(),0); |
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380 } |
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381 |
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382 public Object convert(Object obj) { |
19ca9c4c6c7f
auto-convert table to java array
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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.isList() ) { |
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386 try { |
19ca9c4c6c7f
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387 return t.asList().toArray(a); |
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388 } catch(ArrayStoreException e) {} |
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389 } |
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390 } |
19ca9c4c6c7f
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391 return obj; |
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392 } |
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393 } |
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394 |
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395 private static boolean takesLuaState(JavaMethod m) { |
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396 Class<?>[] paramTypes = m.getParameterTypes(); |
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397 return paramTypes.length > 0 && paramTypes[0].equals(LuanState.class); |
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398 } |
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399 |
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400 private static ArgConverter[] getArgConverters(boolean takesLuaState,JavaMethod m) { |
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401 final boolean isVarArgs = m.isVarArgs(); |
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402 Class<?>[] paramTypes = m.getParameterTypes(); |
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403 if( takesLuaState ) { |
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404 Class<?>[] t = new Class<?>[paramTypes.length-1]; |
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405 System.arraycopy(paramTypes,1,t,0,t.length); |
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406 paramTypes = t; |
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407 } |
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408 ArgConverter[] a = new ArgConverter[paramTypes.length]; |
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409 for( int i=0; i<a.length; i++ ) { |
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410 Class<?> paramType = paramTypes[i]; |
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411 if( isVarArgs && i == a.length-1 ) |
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412 paramType = paramType.getComponentType(); |
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413 a[i] = getArgConverter(paramType); |
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414 } |
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415 return a; |
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416 } |
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417 |
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418 private static ArgConverter getArgConverter(Class<?> cls) { |
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419 if( cls == Double.TYPE || cls.equals(Double.class) ) |
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420 return ARG_DOUBLE; |
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421 if( cls == Float.TYPE || cls.equals(Float.class) ) |
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422 return ARG_FLOAT; |
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423 if( cls == Long.TYPE || cls.equals(Long.class) ) |
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424 return ARG_LONG; |
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425 if( cls == Integer.TYPE || cls.equals(Integer.class) ) |
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426 return ARG_INTEGER; |
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427 if( cls == Short.TYPE || cls.equals(Short.class) ) |
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428 return ARG_SHORT; |
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429 if( cls == Byte.TYPE || cls.equals(Byte.class) ) |
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430 return ARG_BYTE; |
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431 if( cls.equals(LuanTable.class) ) |
47
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432 return ARG_TABLE; |
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433 if( cls.equals(Map.class) ) |
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434 return ARG_MAP; |
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435 if( cls.equals(List.class) ) |
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436 return ARG_LIST; |
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437 if( cls.equals(Set.class) ) |
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438 return ARG_SET; |
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439 if( cls.isArray() && !cls.getComponentType().isPrimitive() ) |
19ca9c4c6c7f
auto-convert table to java array
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440 return new ArgArray(cls); |
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441 return ARG_SAME; |
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442 } |
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443 |
37
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444 |
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445 |
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446 private static abstract class JavaMethod { |
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447 abstract boolean isVarArgs(); |
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448 abstract Class<?>[] getParameterTypes(); |
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449 abstract Object invoke(Object obj,Object... args) |
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450 throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, InstantiationException; |
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451 abstract Class<?> getReturnType(); |
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452 |
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453 static JavaMethod of(final Method m) { |
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454 return new JavaMethod() { |
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455 @Override boolean isVarArgs() { |
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456 return m.isVarArgs(); |
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457 } |
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458 @Override Class<?>[] getParameterTypes() { |
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459 return m.getParameterTypes(); |
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460 } |
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461 @Override Object invoke(Object obj,Object... args) |
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462 throws IllegalAccessException, IllegalArgumentException, InvocationTargetException |
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463 { |
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464 return m.invoke(obj,args); |
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465 } |
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466 @Override Class<?> getReturnType() { |
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467 return m.getReturnType(); |
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468 } |
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469 @Override public String toString() { |
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470 return m.toString(); |
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|
471 } |
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472 }; |
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473 } |
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474 |
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475 static JavaMethod of(final Constructor c) { |
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476 return new JavaMethod() { |
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477 @Override boolean isVarArgs() { |
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478 return c.isVarArgs(); |
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479 } |
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480 @Override Class<?>[] getParameterTypes() { |
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481 return c.getParameterTypes(); |
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482 } |
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483 @Override Object invoke(Object obj,Object... args) |
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484 throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, InstantiationException |
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485 { |
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486 return c.newInstance(args); |
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487 } |
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488 @Override Class<?> getReturnType() { |
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489 return c.getDeclaringClass(); |
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490 } |
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491 @Override public String toString() { |
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492 return c.toString(); |
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493 } |
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494 }; |
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495 } |
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496 |
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497 } |
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498 |
1
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499 } |