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annotate src/luan/LuaJavaFunction.java @ 4:24fd6381caca
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git-svn-id: https://luan-java.googlecode.com/svn/trunk@5 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Sun, 18 Nov 2012 04:18:15 +0000 |
parents | 4da26b11d12a |
children | 9cea1aea5eef |
rev | line source |
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1 package luan; |
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2 |
4
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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.InvocationTargetException; |
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6 |
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7 |
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8 public final class LuaJavaFunction extends LuaFunction { |
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9 private final Method method; |
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10 private final Object obj; |
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11 private final RtnConverter rtnConverter; |
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12 private final ArgConverter[] argConverters; |
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13 private final Class<?> varArgCls; |
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14 |
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15 public LuaJavaFunction(Method method,Object obj) { |
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16 this.method = method; |
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17 this.obj = obj; |
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18 this.rtnConverter = getRtnConverter(method); |
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19 this.argConverters = getArgConverters(method); |
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20 if( method.isVarArgs() ) { |
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21 Class<?>[] paramTypes = method.getParameterTypes(); |
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22 this.varArgCls = paramTypes[paramTypes.length-1].getComponentType(); |
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23 } else { |
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24 this.varArgCls = null; |
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25 } |
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26 } |
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27 |
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28 @Override public Object[] call(Object... args) { |
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29 args = fixArgs(args); |
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30 Object rtn; |
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31 try { |
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32 rtn = method.invoke(obj,args); |
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33 } catch(IllegalAccessException e) { |
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34 throw new RuntimeException(e); |
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35 } catch(InvocationTargetException e) { |
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36 throw new RuntimeException(e); |
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37 } |
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38 return rtnConverter.convert(rtn); |
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39 } |
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40 |
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41 private Object[] fixArgs(Object[] args) { |
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42 if( varArgCls==null ) { |
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43 if( args.length != argConverters.length ) { |
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44 Object[] t = new Object[argConverters.length]; |
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45 System.arraycopy(args,0,t,0,Math.min(args.length,t.length)); |
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46 args = t; |
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47 } |
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48 for( int i=0; i<args.length; i++ ) { |
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49 args[i] = argConverters[i].convert(args[i]); |
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50 } |
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51 return args; |
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52 } else { // varargs |
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53 Object[] rtn = new Object[argConverters.length]; |
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54 int n = argConverters.length - 1; |
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55 if( args.length < argConverters.length ) { |
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56 System.arraycopy(args,0,rtn,0,args.length); |
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57 rtn[rtn.length-1] = Array.newInstance(varArgCls,0); |
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58 } else { |
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59 System.arraycopy(args,0,rtn,0,n); |
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60 Object[] varArgs = (Object[])Array.newInstance(varArgCls,args.length-n); |
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61 ArgConverter ac = argConverters[n]; |
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62 for( int i=0; i<varArgs.length; i++ ) { |
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63 varArgs[i] = ac.convert(args[n+i]); |
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64 } |
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65 rtn[rtn.length-1] = varArgs; |
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66 } |
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67 for( int i=0; i<n; i++ ) { |
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68 rtn[i] = argConverters[i].convert(rtn[i]); |
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69 } |
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70 return rtn; |
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71 } |
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72 } |
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73 |
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74 |
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75 private interface RtnConverter { |
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76 public Object[] convert(Object obj); |
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77 } |
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78 |
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79 private static final Object[] EMPTY = new Object[0]; |
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80 |
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81 private static final RtnConverter RTN_EMPTY = new RtnConverter() { |
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82 public Object[] convert(Object obj) { |
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83 return EMPTY; |
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84 } |
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85 }; |
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86 |
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87 private static final RtnConverter RTN_SAME = new RtnConverter() { |
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88 public Object[] convert(Object obj) { |
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89 return new Object[]{obj}; |
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90 } |
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91 }; |
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92 |
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93 private static final RtnConverter RTN_NUMBER = new RtnConverter() { |
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94 public Object[] convert(Object obj) { |
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95 if( obj == null ) |
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96 return new Object[1]; |
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97 Number n = (Number)obj; |
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98 LuaNumber ln = new LuaNumber(n.doubleValue()); |
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99 return new Object[]{ln}; |
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100 } |
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101 }; |
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102 |
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103 private static RtnConverter getRtnConverter(Method m) { |
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104 Class<?> rtnType = m.getReturnType(); |
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105 if( rtnType == Void.TYPE ) |
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106 return RTN_EMPTY; |
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107 if( Number.class.isAssignableFrom(rtnType) |
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108 || rtnType == Short.TYPE |
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109 || rtnType == Integer.TYPE |
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110 || rtnType == Long.TYPE |
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111 || rtnType == Float.TYPE |
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112 || rtnType == Double.TYPE |
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113 ) |
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114 return RTN_NUMBER; |
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115 return RTN_SAME; |
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116 } |
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117 |
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118 |
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119 private interface ArgConverter { |
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120 public Object convert(Object obj); |
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121 } |
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122 |
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123 private static final ArgConverter ARG_SAME = new ArgConverter() { |
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124 public Object convert(Object obj) { |
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125 return obj; |
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126 } |
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127 }; |
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128 |
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129 private static final ArgConverter ARG_DOUBLE = new ArgConverter() { |
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130 public Object convert(Object obj) { |
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131 if( obj instanceof LuaNumber ) { |
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132 LuaNumber ln = (LuaNumber)obj; |
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133 return Double.valueOf(ln.n); |
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134 } |
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135 if( obj instanceof String ) { |
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136 String s = (String)obj; |
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137 try { |
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138 return Double.valueOf(s); |
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139 } catch(NumberFormatException e) {} |
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140 } |
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141 return obj; |
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142 } |
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143 }; |
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144 |
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145 private static final ArgConverter ARG_FLOAT = new ArgConverter() { |
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146 public Object convert(Object obj) { |
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147 if( obj instanceof LuaNumber ) { |
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148 LuaNumber ln = (LuaNumber)obj; |
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149 return Float.valueOf((float)ln.n); |
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150 } |
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151 if( obj instanceof String ) { |
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152 String s = (String)obj; |
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153 try { |
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154 return Float.valueOf(s); |
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155 } catch(NumberFormatException e) {} |
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156 } |
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157 return obj; |
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158 } |
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159 }; |
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160 |
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161 private static final ArgConverter ARG_LONG = new ArgConverter() { |
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162 public Object convert(Object obj) { |
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163 if( obj instanceof LuaNumber ) { |
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164 LuaNumber ln = (LuaNumber)obj; |
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165 long i = (long)ln.n; |
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166 if( i == ln.n ) |
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167 return Long.valueOf(i); |
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168 } |
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169 else if( obj instanceof String ) { |
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170 String s = (String)obj; |
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171 try { |
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172 return Long.valueOf(s); |
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173 } catch(NumberFormatException e) {} |
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174 } |
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175 return obj; |
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176 } |
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177 }; |
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178 |
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179 private static final ArgConverter ARG_INTEGER = new ArgConverter() { |
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180 public Object convert(Object obj) { |
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181 if( obj instanceof LuaNumber ) { |
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182 LuaNumber ln = (LuaNumber)obj; |
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183 int i = (int)ln.n; |
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184 if( i == ln.n ) |
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185 return Integer.valueOf(i); |
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186 } |
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187 else if( obj instanceof String ) { |
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188 String s = (String)obj; |
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189 try { |
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190 return Integer.valueOf(s); |
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191 } catch(NumberFormatException e) {} |
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192 } |
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193 return obj; |
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194 } |
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195 }; |
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196 |
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197 private static final ArgConverter ARG_SHORT = new ArgConverter() { |
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198 public Object convert(Object obj) { |
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199 if( obj instanceof LuaNumber ) { |
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200 LuaNumber ln = (LuaNumber)obj; |
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201 short i = (short)ln.n; |
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202 if( i == ln.n ) |
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203 return Short.valueOf(i); |
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204 } |
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205 else if( obj instanceof String ) { |
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206 String s = (String)obj; |
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207 try { |
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208 return Short.valueOf(s); |
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209 } catch(NumberFormatException e) {} |
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210 } |
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211 return obj; |
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212 } |
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213 }; |
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214 |
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215 private static ArgConverter[] getArgConverters(Method m) { |
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216 final boolean isVarArgs = m.isVarArgs(); |
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217 Class<?>[] paramTypes = m.getParameterTypes(); |
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218 ArgConverter[] a = new ArgConverter[paramTypes.length]; |
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219 for( int i=0; i<a.length; i++ ) { |
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220 Class<?> paramType = paramTypes[i]; |
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221 if( isVarArgs && i == a.length-1 ) |
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222 paramType = paramType.getComponentType(); |
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223 a[i] = getArgConverter(paramType); |
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224 } |
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225 return a; |
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226 } |
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227 |
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228 private static ArgConverter getArgConverter(Class<?> cls) { |
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229 if( cls == Double.TYPE || cls.equals(Double.class) ) |
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230 return ARG_DOUBLE; |
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231 if( cls == Float.TYPE || cls.equals(Float.class) ) |
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232 return ARG_FLOAT; |
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233 if( cls == Long.TYPE || cls.equals(Long.class) ) |
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234 return ARG_LONG; |
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235 if( cls == Integer.TYPE || cls.equals(Integer.class) ) |
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236 return ARG_INTEGER; |
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237 if( cls == Short.TYPE || cls.equals(Short.class) ) |
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238 return ARG_SHORT; |
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239 return ARG_SAME; |
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240 } |
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241 |
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242 } |