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annotate src/luan/LuaJavaFunction.java @ 21:c93d8c781853
add functions
git-svn-id: https://luan-java.googlecode.com/svn/trunk@22 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Tue, 04 Dec 2012 09:16:03 +0000 |
parents | 9cea1aea5eef |
children | 8a57ebfdfd78 |
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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.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 boolean takesLuaState; |
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13 private final ArgConverter[] argConverters; |
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14 private final Class<?> varArgCls; |
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15 |
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16 public LuaJavaFunction(Method method,Object obj) { |
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17 this.method = method; |
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18 this.obj = obj; |
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19 this.rtnConverter = getRtnConverter(method); |
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20 this.takesLuaState = takesLuaState(method); |
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21 this.argConverters = getArgConverters(takesLuaState,method); |
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22 if( method.isVarArgs() ) { |
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23 Class<?>[] paramTypes = method.getParameterTypes(); |
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24 this.varArgCls = paramTypes[paramTypes.length-1].getComponentType(); |
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25 } else { |
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26 this.varArgCls = null; |
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27 } |
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28 } |
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29 |
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30 @Override public Object[] call(LuaState lua,Object... args) { |
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31 args = fixArgs(lua,args); |
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32 Object rtn; |
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33 try { |
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34 rtn = method.invoke(obj,args); |
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35 } catch(IllegalAccessException e) { |
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36 throw new RuntimeException(e); |
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37 } catch(InvocationTargetException e) { |
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38 throw new RuntimeException(e); |
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39 } |
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40 return rtnConverter.convert(rtn); |
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41 } |
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42 |
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43 private Object[] fixArgs(LuaState lua,Object[] args) { |
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44 int n = argConverters.length; |
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45 Object[] rtn; |
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46 int start = 0; |
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47 if( !takesLuaState && varArgCls==null && args.length == n ) { |
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48 rtn = args; |
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49 } else { |
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50 if( takesLuaState ) |
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51 n++; |
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52 rtn = new Object[n]; |
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53 if( takesLuaState ) { |
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54 rtn[start++] = lua; |
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55 } |
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56 n = argConverters.length; |
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57 if( varArgCls != null ) { |
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58 n--; |
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59 if( args.length < argConverters.length ) { |
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60 rtn[rtn.length-1] = Array.newInstance(varArgCls,0); |
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61 } else { |
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62 Object[] varArgs = (Object[])Array.newInstance(varArgCls,args.length-n); |
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63 ArgConverter ac = argConverters[n]; |
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64 for( int i=0; i<varArgs.length; i++ ) { |
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65 varArgs[i] = ac.convert(args[n+i]); |
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66 } |
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67 rtn[rtn.length-1] = varArgs; |
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68 } |
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69 } |
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70 System.arraycopy(args,0,rtn,start,Math.min(args.length,n)); |
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71 } |
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72 for( int i=0; i<n; i++ ) { |
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73 rtn[start+i] = argConverters[i].convert(rtn[start+i]); |
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74 } |
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75 return rtn; |
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76 } |
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77 |
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78 |
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79 private interface RtnConverter { |
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80 public Object[] convert(Object obj); |
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81 } |
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82 |
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83 private static final RtnConverter RTN_EMPTY = new RtnConverter() { |
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84 public Object[] convert(Object obj) { |
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85 return EMPTY_RTN; |
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86 } |
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87 }; |
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88 |
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89 private static final RtnConverter RTN_ARRAY = new RtnConverter() { |
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90 public Object[] convert(Object obj) { |
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91 return (Object[])obj; |
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92 } |
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93 }; |
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94 |
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95 private static final RtnConverter RTN_ONE = new RtnConverter() { |
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96 public Object[] convert(Object obj) { |
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97 return new Object[]{obj}; |
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98 } |
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99 }; |
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100 |
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101 private static final RtnConverter RTN_NUMBER = new RtnConverter() { |
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102 public Object[] convert(Object obj) { |
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103 if( obj == null ) |
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104 return new Object[1]; |
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105 Number n = (Number)obj; |
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106 LuaNumber ln = new LuaNumber(n.doubleValue()); |
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107 return new Object[]{ln}; |
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108 } |
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109 }; |
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110 |
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111 private static RtnConverter getRtnConverter(Method m) { |
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112 Class<?> rtnType = m.getReturnType(); |
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113 if( rtnType == Void.TYPE ) |
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114 return RTN_EMPTY; |
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115 if( Number.class.isAssignableFrom(rtnType) |
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116 || rtnType == Short.TYPE |
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117 || rtnType == Integer.TYPE |
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118 || rtnType == Long.TYPE |
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119 || rtnType == Float.TYPE |
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120 || rtnType == Double.TYPE |
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121 ) |
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122 return RTN_NUMBER; |
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123 if( rtnType.isArray() ) |
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124 return RTN_ARRAY; |
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125 return RTN_ONE; |
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126 } |
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127 |
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128 |
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129 private interface ArgConverter { |
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130 public Object convert(Object obj); |
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131 } |
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132 |
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133 private static final ArgConverter ARG_SAME = new ArgConverter() { |
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134 public Object convert(Object obj) { |
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135 return obj; |
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136 } |
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137 }; |
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138 |
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139 private static final ArgConverter ARG_DOUBLE = new ArgConverter() { |
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140 public Object convert(Object obj) { |
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141 if( obj instanceof LuaNumber ) { |
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142 LuaNumber ln = (LuaNumber)obj; |
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143 return Double.valueOf(ln.n); |
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144 } |
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145 if( obj instanceof String ) { |
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146 String s = (String)obj; |
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147 try { |
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148 return Double.valueOf(s); |
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149 } catch(NumberFormatException e) {} |
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150 } |
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151 return obj; |
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152 } |
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153 }; |
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154 |
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155 private static final ArgConverter ARG_FLOAT = new ArgConverter() { |
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156 public Object convert(Object obj) { |
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157 if( obj instanceof LuaNumber ) { |
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158 LuaNumber ln = (LuaNumber)obj; |
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159 return Float.valueOf((float)ln.n); |
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160 } |
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161 if( obj instanceof String ) { |
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162 String s = (String)obj; |
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163 try { |
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164 return Float.valueOf(s); |
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165 } catch(NumberFormatException e) {} |
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166 } |
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167 return obj; |
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168 } |
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169 }; |
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170 |
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171 private static final ArgConverter ARG_LONG = new ArgConverter() { |
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172 public Object convert(Object obj) { |
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173 if( obj instanceof LuaNumber ) { |
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174 LuaNumber ln = (LuaNumber)obj; |
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175 long i = (long)ln.n; |
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176 if( i == ln.n ) |
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177 return Long.valueOf(i); |
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178 } |
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179 else if( obj instanceof String ) { |
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180 String s = (String)obj; |
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181 try { |
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182 return Long.valueOf(s); |
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183 } catch(NumberFormatException e) {} |
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184 } |
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185 return obj; |
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186 } |
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187 }; |
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188 |
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189 private static final ArgConverter ARG_INTEGER = new ArgConverter() { |
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190 public Object convert(Object obj) { |
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191 if( obj instanceof LuaNumber ) { |
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192 LuaNumber ln = (LuaNumber)obj; |
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193 int i = (int)ln.n; |
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194 if( i == ln.n ) |
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195 return Integer.valueOf(i); |
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196 } |
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197 else if( obj instanceof String ) { |
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198 String s = (String)obj; |
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199 try { |
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200 return Integer.valueOf(s); |
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201 } catch(NumberFormatException e) {} |
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202 } |
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203 return obj; |
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204 } |
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205 }; |
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206 |
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207 private static final ArgConverter ARG_SHORT = new ArgConverter() { |
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208 public Object convert(Object obj) { |
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209 if( obj instanceof LuaNumber ) { |
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210 LuaNumber ln = (LuaNumber)obj; |
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211 short i = (short)ln.n; |
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212 if( i == ln.n ) |
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213 return Short.valueOf(i); |
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214 } |
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215 else if( obj instanceof String ) { |
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216 String s = (String)obj; |
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217 try { |
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218 return Short.valueOf(s); |
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219 } catch(NumberFormatException e) {} |
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220 } |
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221 return obj; |
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222 } |
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223 }; |
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224 |
21
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225 private static boolean takesLuaState(Method m) { |
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226 Class<?>[] paramTypes = m.getParameterTypes(); |
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227 return paramTypes.length > 0 && paramTypes[0].equals(LuaState.class); |
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228 } |
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229 |
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230 private static ArgConverter[] getArgConverters(boolean takesLuaState,Method m) { |
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231 final boolean isVarArgs = m.isVarArgs(); |
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232 Class<?>[] paramTypes = m.getParameterTypes(); |
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233 if( takesLuaState ) { |
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234 Class<?>[] t = new Class<?>[paramTypes.length-1]; |
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235 System.arraycopy(paramTypes,1,t,0,t.length); |
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236 paramTypes = t; |
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237 } |
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238 ArgConverter[] a = new ArgConverter[paramTypes.length]; |
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239 for( int i=0; i<a.length; i++ ) { |
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240 Class<?> paramType = paramTypes[i]; |
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241 if( isVarArgs && i == a.length-1 ) |
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242 paramType = paramType.getComponentType(); |
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243 a[i] = getArgConverter(paramType); |
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244 } |
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245 return a; |
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246 } |
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247 |
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248 private static ArgConverter getArgConverter(Class<?> cls) { |
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249 if( cls == Double.TYPE || cls.equals(Double.class) ) |
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250 return ARG_DOUBLE; |
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251 if( cls == Float.TYPE || cls.equals(Float.class) ) |
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252 return ARG_FLOAT; |
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253 if( cls == Long.TYPE || cls.equals(Long.class) ) |
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254 return ARG_LONG; |
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255 if( cls == Integer.TYPE || cls.equals(Integer.class) ) |
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256 return ARG_INTEGER; |
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257 if( cls == Short.TYPE || cls.equals(Short.class) ) |
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258 return ARG_SHORT; |
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259 return ARG_SAME; |
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260 } |
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261 |
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262 } |