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annotate src/luan/LuaJavaFunction.java @ 46:a443637829c1

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remove LuaNumber git-svn-id: https://luan-java.googlecode.com/svn/trunk@47 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 27 Dec 2012 01:48:36 +0000
parents 57054fa43189
children 659c7139e903
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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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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9 public final class LuaJavaFunction extends LuaFunction {
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10 private final JavaMethod method;
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11 private final Object obj;
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12 private final RtnConverter rtnConverter;
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13 private final boolean takesLuaState;
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14 private final ArgConverter[] argConverters;
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15 private final Class<?> varArgCls;
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17 public LuaJavaFunction(Method method,Object obj) {
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18 this( JavaMethod.of(method), obj );
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19 }
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21 public LuaJavaFunction(Constructor constr,Object obj) {
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22 this( JavaMethod.of(constr), obj );
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23 }
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25 LuaJavaFunction(JavaMethod method,Object obj) {
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26 this.method = method;
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27 this.obj = obj;
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28 this.rtnConverter = getRtnConverter(method);
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29 this.takesLuaState = takesLuaState(method);
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30 this.argConverters = getArgConverters(takesLuaState,method);
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31 if( method.isVarArgs() ) {
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32 Class<?>[] paramTypes = method.getParameterTypes();
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33 this.varArgCls = paramTypes[paramTypes.length-1].getComponentType();
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34 } else {
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35 this.varArgCls = null;
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36 }
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37 }
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39 public Class<?>[] getParameterTypes() {
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40 return method.getParameterTypes();
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41 }
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43 @Override public Object[] call(LuaState lua,Object[] args) throws LuaException {
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44 args = fixArgs(lua,args);
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45 Object rtn;
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46 try {
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47 rtn = method.invoke(obj,args);
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48 } catch(IllegalAccessException e) {
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49 throw new RuntimeException(e);
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50 } catch(InvocationTargetException e) {
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51 Throwable cause = e.getCause();
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52 if( cause instanceof Error )
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53 throw (Error)cause;
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54 if( cause instanceof RuntimeException )
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55 throw (RuntimeException)cause;
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56 if( cause instanceof LuaException )
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57 throw (LuaException)cause;
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58 throw new RuntimeException(e);
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59 } catch(InstantiationException e) {
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60 throw new RuntimeException(e);
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61 }
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62 return rtnConverter.convert(rtn);
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63 }
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64
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65 private Object[] fixArgs(LuaState lua,Object[] args) {
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66 int n = argConverters.length;
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67 Object[] rtn;
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68 int start = 0;
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69 if( !takesLuaState && varArgCls==null && args.length == n ) {
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70 rtn = args;
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71 } else {
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72 if( takesLuaState )
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73 n++;
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74 rtn = new Object[n];
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75 if( takesLuaState ) {
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76 rtn[start++] = lua;
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77 }
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78 n = argConverters.length;
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79 if( varArgCls != null ) {
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80 n--;
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81 if( args.length < argConverters.length ) {
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82 rtn[rtn.length-1] = Array.newInstance(varArgCls,0);
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83 } else {
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84 int len = args.length - n;
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85 Object varArgs = Array.newInstance(varArgCls,len);
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86 ArgConverter ac = argConverters[n];
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87 for( int i=0; i<len; i++ ) {
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88 Array.set( varArgs, i, ac.convert(args[n+i]) );
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89 }
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90 rtn[rtn.length-1] = varArgs;
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91 }
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92 }
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93 System.arraycopy(args,0,rtn,start,Math.min(args.length,n));
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94 }
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95 for( int i=0; i<n; i++ ) {
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96 rtn[start+i] = argConverters[i].convert(rtn[start+i]);
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97 }
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98 return rtn;
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99 }
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102 private interface RtnConverter {
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103 public Object[] convert(Object obj);
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104 }
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105
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106 private static final RtnConverter RTN_EMPTY = new RtnConverter() {
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107 public Object[] convert(Object obj) {
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108 return EMPTY_RTN;
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109 }
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110 };
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111
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112 private static final RtnConverter RTN_ARRAY = new RtnConverter() {
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113 public Object[] convert(Object obj) {
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114 if( obj == null )
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115 return NULL_RTN;
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116 return (Object[])obj;
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117 }
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118 };
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119
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120 private static final RtnConverter RTN_ONE = new RtnConverter() {
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121 public Object[] convert(Object obj) {
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122 return new Object[]{obj};
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123 }
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124 };
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125
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126 private static final Object[] NULL_RTN = new Object[1];
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127
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128 private static RtnConverter getRtnConverter(JavaMethod m) {
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129 Class<?> rtnType = m.getReturnType();
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130 if( rtnType == Void.TYPE )
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131 return RTN_EMPTY;
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132 if( rtnType.isArray() ) {
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133 return RTN_ARRAY;
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134 }
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135 return RTN_ONE;
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136 }
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137
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138
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139 private interface ArgConverter {
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140 public Object convert(Object obj);
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141 }
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142
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143 private static final ArgConverter ARG_SAME = new ArgConverter() {
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144 public Object convert(Object obj) {
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145 return obj;
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146 }
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147 };
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148
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149 private static boolean takesLuaState(JavaMethod m) {
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150 Class<?>[] paramTypes = m.getParameterTypes();
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151 return paramTypes.length > 0 && paramTypes[0].equals(LuaState.class);
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152 }
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153
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154 private static ArgConverter[] getArgConverters(boolean takesLuaState,JavaMethod m) {
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155 final boolean isVarArgs = m.isVarArgs();
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156 Class<?>[] paramTypes = m.getParameterTypes();
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157 if( takesLuaState ) {
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158 Class<?>[] t = new Class<?>[paramTypes.length-1];
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159 System.arraycopy(paramTypes,1,t,0,t.length);
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160 paramTypes = t;
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161 }
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162 ArgConverter[] a = new ArgConverter[paramTypes.length];
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163 for( int i=0; i<a.length; i++ ) {
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164 Class<?> paramType = paramTypes[i];
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165 if( isVarArgs && i == a.length-1 )
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166 paramType = paramType.getComponentType();
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167 a[i] = getArgConverter(paramType);
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168 }
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169 return a;
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170 }
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171
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172 private static ArgConverter getArgConverter(Class<?> cls) {
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173 return ARG_SAME;
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174 }
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175
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176
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177
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178 private static abstract class JavaMethod {
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179 abstract boolean isVarArgs();
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180 abstract Class<?>[] getParameterTypes();
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181 abstract Object invoke(Object obj,Object... args)
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182 throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, InstantiationException;
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183 abstract Class<?> getReturnType();
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184
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185 static JavaMethod of(final Method m) {
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186 return new JavaMethod() {
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187 @Override boolean isVarArgs() {
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188 return m.isVarArgs();
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189 }
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190 @Override Class<?>[] getParameterTypes() {
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191 return m.getParameterTypes();
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192 }
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193 @Override Object invoke(Object obj,Object... args)
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194 throws IllegalAccessException, IllegalArgumentException, InvocationTargetException
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195 {
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196 return m.invoke(obj,args);
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197 }
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198 @Override Class<?> getReturnType() {
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199 return m.getReturnType();
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200 }
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201 @Override public String toString() {
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202 return m.toString();
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203 }
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204 };
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205 }
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206
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diff changeset
207 static JavaMethod of(final Constructor c) {
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208 return new JavaMethod() {
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209 @Override boolean isVarArgs() {
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210 return c.isVarArgs();
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211 }
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212 @Override Class<?>[] getParameterTypes() {
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213 return c.getParameterTypes();
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214 }
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215 @Override Object invoke(Object obj,Object... args)
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216 throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, InstantiationException
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217 {
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218 return c.newInstance(args);
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219 }
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220 @Override Class<?> getReturnType() {
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221 return c.getDeclaringClass();
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222 }
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223 @Override public String toString() {
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224 return c.toString();
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225 }
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226 };
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227 }
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228
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229 }
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230
1
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231 }