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annotate src/luan/LuaJavaFunction.java @ 47:659c7139e903

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better conversion git-svn-id: https://luan-java.googlecode.com/svn/trunk@48 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 27 Dec 2012 04:36:44 +0000
parents a443637829c1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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diff changeset
1 package luan;
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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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12 public final class LuaJavaFunction extends LuaFunction {
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13 private final JavaMethod method;
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14 private final Object obj;
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15 private final RtnConverter rtnConverter;
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16 private final boolean takesLuaState;
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17 private final ArgConverter[] argConverters;
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18 private final Class<?> varArgCls;
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20 public LuaJavaFunction(Method method,Object obj) {
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21 this( JavaMethod.of(method), obj );
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22 }
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24 public LuaJavaFunction(Constructor constr,Object obj) {
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25 this( JavaMethod.of(constr), obj );
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26 }
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28 LuaJavaFunction(JavaMethod method,Object obj) {
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29 this.method = method;
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30 this.obj = obj;
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31 this.rtnConverter = getRtnConverter(method);
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32 this.takesLuaState = takesLuaState(method);
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33 this.argConverters = getArgConverters(takesLuaState,method);
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34 if( method.isVarArgs() ) {
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35 Class<?>[] paramTypes = method.getParameterTypes();
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36 this.varArgCls = paramTypes[paramTypes.length-1].getComponentType();
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37 } else {
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38 this.varArgCls = null;
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39 }
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40 }
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41
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42 public Class<?>[] getParameterTypes() {
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43 return method.getParameterTypes();
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44 }
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45
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46 @Override public Object[] call(LuaState lua,Object[] args) throws LuaException {
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47 args = fixArgs(lua,args);
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48 Object rtn;
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49 try {
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50 rtn = method.invoke(obj,args);
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51 } catch(IllegalArgumentException e) {
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52 checkArgs(lua,args);
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53 throw e;
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54 } catch(IllegalAccessException e) {
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55 throw new RuntimeException(e);
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56 } catch(InvocationTargetException e) {
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57 Throwable cause = e.getCause();
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58 if( cause instanceof Error )
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59 throw (Error)cause;
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60 if( cause instanceof RuntimeException )
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61 throw (RuntimeException)cause;
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62 if( cause instanceof LuaException )
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63 throw (LuaException)cause;
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64 throw new RuntimeException(e);
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65 } catch(InstantiationException e) {
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66 throw new RuntimeException(e);
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67 }
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68 return rtnConverter.convert(rtn);
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69 }
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70
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71 private void checkArgs(LuaState lua,Object[] args) throws LuaException {
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72 Class<?>[] a = getParameterTypes();
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73 for( int i=0; i<a.length; i++ ) {
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74 if( !a[i].isInstance(args[i]) ) {
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75 String got = args[i].getClass().getName();
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76 String expected = a[i].getName();
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77 if( !takesLuaState )
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78 i++;
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79 throw new LuaException(lua,LuaElement.JAVA,"bad argument #"+i+" ("+expected+" expected, got "+got+")");
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80 }
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81 }
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82 }
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83
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84 private Object[] fixArgs(LuaState lua,Object[] args) {
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85 int n = argConverters.length;
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86 Object[] rtn;
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87 int start = 0;
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88 if( !takesLuaState && varArgCls==null && args.length == n ) {
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89 rtn = args;
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90 } else {
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91 if( takesLuaState )
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92 n++;
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93 rtn = new Object[n];
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94 if( takesLuaState ) {
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95 rtn[start++] = lua;
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96 }
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97 n = argConverters.length;
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98 if( varArgCls != null ) {
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99 n--;
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100 if( args.length < argConverters.length ) {
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101 rtn[rtn.length-1] = Array.newInstance(varArgCls,0);
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102 } else {
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103 int len = args.length - n;
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104 Object varArgs = Array.newInstance(varArgCls,len);
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105 ArgConverter ac = argConverters[n];
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106 for( int i=0; i<len; i++ ) {
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107 Array.set( varArgs, i, ac.convert(args[n+i]) );
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108 }
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109 rtn[rtn.length-1] = varArgs;
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110 }
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111 }
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112 System.arraycopy(args,0,rtn,start,Math.min(args.length,n));
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113 }
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114 for( int i=0; i<n; i++ ) {
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115 rtn[start+i] = argConverters[i].convert(rtn[start+i]);
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116 }
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117 return rtn;
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118 }
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119
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120
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121 private interface RtnConverter {
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122 public Object[] convert(Object obj);
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123 }
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124
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125 private static final RtnConverter RTN_EMPTY = new RtnConverter() {
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126 public Object[] convert(Object obj) {
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127 return EMPTY_RTN;
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128 }
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129 };
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130
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131 private static final RtnConverter RTN_ARRAY = new RtnConverter() {
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132 public Object[] convert(Object obj) {
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133 if( obj == null )
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134 return NULL_RTN;
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135 return (Object[])obj;
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136 }
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137 };
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138
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139 private static final RtnConverter RTN_ONE = new RtnConverter() {
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140 public Object[] convert(Object obj) {
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141 return new Object[]{obj};
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142 }
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143 };
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144
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145 private static final Object[] NULL_RTN = new Object[1];
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146
47
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147 private static final RtnConverter RTN_NUMBER_ARRAY = new RtnConverter() {
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148 public Object[] convert(Object obj) {
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149 if( obj == null )
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150 return NULL_RTN;
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151 Object[] rtn = new Object[Array.getLength(obj)];
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152 for( int i=0; i<rtn.length; i++ ) {
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153 rtn[i] = Array.get(obj,i);
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154 }
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155 return rtn;
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156 }
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157 };
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158
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159 private static RtnConverter getRtnConverter(JavaMethod m) {
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160 Class<?> rtnType = m.getReturnType();
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161 if( rtnType == Void.TYPE )
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162 return RTN_EMPTY;
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163 if( rtnType.isArray() ) {
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164 rtnType = rtnType.getComponentType();
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165 if( isNumber(rtnType) )
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166 return RTN_NUMBER_ARRAY;
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167 return RTN_ARRAY;
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168 }
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169 return RTN_ONE;
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170 }
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171
47
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172 private static boolean isNumber(Class<?> rtnType) {
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173 return rtnType == Byte.TYPE
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174 || rtnType == Short.TYPE
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175 || rtnType == Integer.TYPE
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176 || rtnType == Long.TYPE
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177 || rtnType == Float.TYPE
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178 || rtnType == Double.TYPE
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179 ;
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180 }
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181
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182 private interface ArgConverter {
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183 public Object convert(Object obj);
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184 }
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185
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186 private static final ArgConverter ARG_SAME = new ArgConverter() {
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187 public Object convert(Object obj) {
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188 return obj;
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189 }
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190 };
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191
47
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192 private static final ArgConverter ARG_DOUBLE = new ArgConverter() {
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193 public Object convert(Object obj) {
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194 if( obj instanceof Double )
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195 return obj;
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196 if( obj instanceof Number ) {
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197 Number n = (Number)obj;
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198 return n.doubleValue();
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199 }
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200 if( obj instanceof String ) {
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201 String s = (String)obj;
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202 try {
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203 return Double.valueOf(s);
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204 } catch(NumberFormatException e) {}
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205 }
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206 return obj;
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207 }
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208 };
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209
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210 private static final ArgConverter ARG_FLOAT = new ArgConverter() {
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211 public Object convert(Object obj) {
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diff changeset
212 if( obj instanceof Float )
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213 return obj;
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214 if( obj instanceof Number ) {
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diff changeset
215 Number n = (Number)obj;
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diff changeset
216 float r = n.floatValue();
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diff changeset
217 if( r==n.doubleValue() )
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218 return r;
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219 }
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220 if( obj instanceof String ) {
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diff changeset
221 String s = (String)obj;
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diff changeset
222 try {
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diff changeset
223 return Float.valueOf(s);
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224 } catch(NumberFormatException e) {}
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225 }
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226 return obj;
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227 }
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diff changeset
228 };
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229
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diff changeset
230 private static final ArgConverter ARG_LONG = new ArgConverter() {
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diff changeset
231 public Object convert(Object obj) {
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232 if( obj instanceof Long )
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233 return obj;
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234 if( obj instanceof Number ) {
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diff changeset
235 Number n = (Number)obj;
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diff changeset
236 long r = n.longValue();
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diff changeset
237 if( r==n.doubleValue() )
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diff changeset
238 return r;
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239 }
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diff changeset
240 else if( obj instanceof String ) {
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diff changeset
241 String s = (String)obj;
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diff changeset
242 try {
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diff changeset
243 return Long.valueOf(s);
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diff changeset
244 } catch(NumberFormatException e) {}
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245 }
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246 return obj;
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247 }
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diff changeset
248 };
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249
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diff changeset
250 private static final ArgConverter ARG_INTEGER = new ArgConverter() {
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diff changeset
251 public Object convert(Object obj) {
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diff changeset
252 if( obj instanceof Integer )
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253 return obj;
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254 if( obj instanceof Number ) {
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diff changeset
255 Number n = (Number)obj;
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diff changeset
256 int r = n.intValue();
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diff changeset
257 if( r==n.doubleValue() )
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diff changeset
258 return r;
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diff changeset
259 }
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diff changeset
260 else if( obj instanceof String ) {
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diff changeset
261 String s = (String)obj;
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diff changeset
262 try {
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diff changeset
263 return Integer.valueOf(s);
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diff changeset
264 } catch(NumberFormatException e) {}
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diff changeset
265 }
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diff changeset
266 return obj;
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diff changeset
267 }
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diff changeset
268 };
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diff changeset
269
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diff changeset
270 private static final ArgConverter ARG_SHORT = new ArgConverter() {
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diff changeset
271 public Object convert(Object obj) {
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diff changeset
272 if( obj instanceof Short )
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diff changeset
273 return obj;
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diff changeset
274 if( obj instanceof Number ) {
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diff changeset
275 Number n = (Number)obj;
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diff changeset
276 short r = n.shortValue();
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diff changeset
277 if( r==n.doubleValue() )
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diff changeset
278 return r;
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diff changeset
279 }
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diff changeset
280 else if( obj instanceof String ) {
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diff changeset
281 String s = (String)obj;
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diff changeset
282 try {
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diff changeset
283 return Short.valueOf(s);
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diff changeset
284 } catch(NumberFormatException e) {}
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diff changeset
285 }
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diff changeset
286 return obj;
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diff changeset
287 }
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diff changeset
288 };
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diff changeset
289
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diff changeset
290 private static final ArgConverter ARG_BYTE = new ArgConverter() {
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diff changeset
291 public Object convert(Object obj) {
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diff changeset
292 if( obj instanceof Byte )
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diff changeset
293 return obj;
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diff changeset
294 if( obj instanceof Number ) {
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diff changeset
295 Number n = (Number)obj;
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diff changeset
296 byte r = n.byteValue();
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diff changeset
297 if( r==n.doubleValue() )
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diff changeset
298 return r;
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diff changeset
299 }
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diff changeset
300 else if( obj instanceof String ) {
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diff changeset
301 String s = (String)obj;
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diff changeset
302 try {
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diff changeset
303 return Byte.valueOf(s);
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diff changeset
304 } catch(NumberFormatException e) {}
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diff changeset
305 }
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diff changeset
306 return obj;
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diff changeset
307 }
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diff changeset
308 };
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diff changeset
309
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diff changeset
310 private static final ArgConverter ARG_TABLE = new ArgConverter() {
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diff changeset
311 public Object convert(Object obj) {
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diff changeset
312 if( obj instanceof List ) {
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diff changeset
313 @SuppressWarnings("unchecked")
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diff changeset
314 List<Object> list = (List<Object>)obj;
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diff changeset
315 return new LuaTable(list);
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diff changeset
316 }
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diff changeset
317 if( obj instanceof Map ) {
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diff changeset
318 @SuppressWarnings("unchecked")
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diff changeset
319 Map<Object,Object> map = (Map<Object,Object>)obj;
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diff changeset
320 return new LuaTable(map);
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diff changeset
321 }
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diff changeset
322 if( obj instanceof Set ) {
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parents: 46
diff changeset
323 @SuppressWarnings("unchecked")
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diff changeset
324 Set<Object> set = (Set<Object>)obj;
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325 return new LuaTable(set);
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326 }
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327 return obj;
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328 }
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diff changeset
329 };
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diff changeset
330
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diff changeset
331 private static final ArgConverter ARG_MAP = new ArgConverter() {
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diff changeset
332 public Object convert(Object obj) {
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333 if( obj instanceof LuaTable ) {
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diff changeset
334 LuaTable t = (LuaTable)obj;
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diff changeset
335 return t.asMap();
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336 }
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337 return obj;
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338 }
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diff changeset
339 };
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340
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diff changeset
341 private static final ArgConverter ARG_LIST = new ArgConverter() {
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diff changeset
342 public Object convert(Object obj) {
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diff changeset
343 if( obj instanceof LuaTable ) {
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diff changeset
344 LuaTable t = (LuaTable)obj;
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diff changeset
345 if( t.isList() )
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diff changeset
346 return t.asList();
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diff changeset
347 }
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diff changeset
348 return obj;
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349 }
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diff changeset
350 };
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diff changeset
351
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diff changeset
352 private static final ArgConverter ARG_SET = new ArgConverter() {
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diff changeset
353 public Object convert(Object obj) {
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parents: 46
diff changeset
354 if( obj instanceof LuaTable ) {
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diff changeset
355 LuaTable t = (LuaTable)obj;
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parents: 46
diff changeset
356 if( t.isSet() )
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diff changeset
357 return t.asSet();
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diff changeset
358 }
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diff changeset
359 return obj;
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diff changeset
360 }
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diff changeset
361 };
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diff changeset
362
37
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 21
diff changeset
363 private static boolean takesLuaState(JavaMethod m) {
21
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diff changeset
364 Class<?>[] paramTypes = m.getParameterTypes();
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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diff changeset
365 return paramTypes.length > 0 && paramTypes[0].equals(LuaState.class);
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diff changeset
366 }
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diff changeset
367
37
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diff changeset
368 private static ArgConverter[] getArgConverters(boolean takesLuaState,JavaMethod m) {
4
24fd6381caca add to interp
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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diff changeset
369 final boolean isVarArgs = m.isVarArgs();
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370 Class<?>[] paramTypes = m.getParameterTypes();
21
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parents: 12
diff changeset
371 if( takesLuaState ) {
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parents: 12
diff changeset
372 Class<?>[] t = new Class<?>[paramTypes.length-1];
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diff changeset
373 System.arraycopy(paramTypes,1,t,0,t.length);
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diff changeset
374 paramTypes = t;
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parents: 12
diff changeset
375 }
1
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diff changeset
376 ArgConverter[] a = new ArgConverter[paramTypes.length];
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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diff changeset
377 for( int i=0; i<a.length; i++ ) {
4
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 2
diff changeset
378 Class<?> paramType = paramTypes[i];
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parents: 2
diff changeset
379 if( isVarArgs && i == a.length-1 )
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parents: 2
diff changeset
380 paramType = paramType.getComponentType();
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 2
diff changeset
381 a[i] = getArgConverter(paramType);
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2df768b926aa start Luan
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diff changeset
382 }
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diff changeset
383 return a;
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384 }
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diff changeset
385
2df768b926aa start Luan
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diff changeset
386 private static ArgConverter getArgConverter(Class<?> cls) {
47
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parents: 46
diff changeset
387 if( cls == Double.TYPE || cls.equals(Double.class) )
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diff changeset
388 return ARG_DOUBLE;
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parents: 46
diff changeset
389 if( cls == Float.TYPE || cls.equals(Float.class) )
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parents: 46
diff changeset
390 return ARG_FLOAT;
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parents: 46
diff changeset
391 if( cls == Long.TYPE || cls.equals(Long.class) )
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diff changeset
392 return ARG_LONG;
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parents: 46
diff changeset
393 if( cls == Integer.TYPE || cls.equals(Integer.class) )
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diff changeset
394 return ARG_INTEGER;
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parents: 46
diff changeset
395 if( cls == Short.TYPE || cls.equals(Short.class) )
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diff changeset
396 return ARG_SHORT;
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parents: 46
diff changeset
397 if( cls == Byte.TYPE || cls.equals(Byte.class) )
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parents: 46
diff changeset
398 return ARG_BYTE;
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parents: 46
diff changeset
399 if( cls.equals(LuaTable.class) )
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diff changeset
400 return ARG_TABLE;
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parents: 46
diff changeset
401 if( cls.equals(Map.class) )
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parents: 46
diff changeset
402 return ARG_MAP;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 46
diff changeset
403 if( cls.equals(List.class) )
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parents: 46
diff changeset
404 return ARG_LIST;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 46
diff changeset
405 if( cls.equals(Set.class) )
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diff changeset
406 return ARG_SET;
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parents:
diff changeset
407 return ARG_SAME;
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diff changeset
408 }
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diff changeset
409
37
8a57ebfdfd78 add JavaLib
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parents: 21
diff changeset
410
8a57ebfdfd78 add JavaLib
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parents: 21
diff changeset
411
8a57ebfdfd78 add JavaLib
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parents: 21
diff changeset
412 private static abstract class JavaMethod {
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parents: 21
diff changeset
413 abstract boolean isVarArgs();
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parents: 21
diff changeset
414 abstract Class<?>[] getParameterTypes();
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 21
diff changeset
415 abstract Object invoke(Object obj,Object... args)
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 21
diff changeset
416 throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, InstantiationException;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 21
diff changeset
417 abstract Class<?> getReturnType();
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parents: 21
diff changeset
418
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 21
diff changeset
419 static JavaMethod of(final Method m) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 21
diff changeset
420 return new JavaMethod() {
43
80b67b1a653c implement string lib
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parents: 40
diff changeset
421 @Override boolean isVarArgs() {
37
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 21
diff changeset
422 return m.isVarArgs();
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parents: 21
diff changeset
423 }
43
80b67b1a653c implement string lib
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parents: 40
diff changeset
424 @Override Class<?>[] getParameterTypes() {
37
8a57ebfdfd78 add JavaLib
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 21
diff changeset
425 return m.getParameterTypes();
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parents: 21
diff changeset
426 }
43
80b67b1a653c implement string lib
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parents: 40
diff changeset
427 @Override Object invoke(Object obj,Object... args)
37
8a57ebfdfd78 add JavaLib
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parents: 21
diff changeset
428 throws IllegalAccessException, IllegalArgumentException, InvocationTargetException
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 21
diff changeset
429 {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 21
diff changeset
430 return m.invoke(obj,args);
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431 }
43
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432 @Override Class<?> getReturnType() {
37
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433 return m.getReturnType();
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434 }
43
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435 @Override public String toString() {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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436 return m.toString();
80b67b1a653c implement string lib
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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437 }
37
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438 };
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439 }
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440
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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441 static JavaMethod of(final Constructor c) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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442 return new JavaMethod() {
43
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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443 @Override boolean isVarArgs() {
37
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444 return c.isVarArgs();
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445 }
43
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446 @Override Class<?>[] getParameterTypes() {
37
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447 return c.getParameterTypes();
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448 }
43
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449 @Override Object invoke(Object obj,Object... args)
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450 throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, InstantiationException
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451 {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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452 return c.newInstance(args);
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453 }
43
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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454 @Override Class<?> getReturnType() {
37
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455 return c.getDeclaringClass();
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456 }
43
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457 @Override public String toString() {
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458 return c.toString();
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459 }
37
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460 };
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461 }
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462
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463 }
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464
1
2df768b926aa start Luan
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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465 }