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package node;

import java.lang.reflect.Constructor;

import java.lang.reflect.Method;

import java.lang.reflect.Array;

import java.util.Arrays;

public class VarArgs {

public static Object[] getVarArgs(Method method, Object[] args) {

if (method.isVarArgs()) {

Class<?>[] methodParameterTypes = method.getParameterTypes();

return getVarArgs(args, methodParameterTypes);

}

return args;

}

public static Object[] getVarArgs(Constructor constructor, Object[] args) {

if (constructor.isVarArgs()) {

Class<?>[] constructorParameterTypes = constructor.getParameterTypes();

return getVarArgs(args, constructorParameterTypes);

}

return args;

}

public static Object[] getVarArgs(Object[] args, Class<?>[] methodParameterTypes) {

if(args.length == methodParameterTypes.length

&& args[args.length - 1].getClass().equals(methodParameterTypes[methodParameterTypes.length - 1])) {

return args;

}

Object[] newArgs = new Object[methodParameterTypes.length];

System.arraycopy(args, 0, newArgs, 0, methodParameterTypes.length - 1);

Class<?> varArgComponentType = methodParameterTypes[methodParameterTypes.length - 1].getComponentType();

int varArgLength = args.length - methodParameterTypes.length + 1;

Object[] varArgsArray = (Object[])Array.newInstance(varArgComponentType, varArgLength);

// System.out.println("varArgComponentType: " + varArgComponentType);

// System.out.println("varArgsArray: " + Arrays.asList(varArgsArray).toString());

// System.out.println("args: " + Arrays.asList(args).toString());

System.arraycopy(args, methodParameterTypes.length - 1, varArgsArray, 0, varArgLength);

newArgs[methodParameterTypes.length - 1] = varArgsArray;

return newArgs;

}

}