org.apache.hadoop.util
Class GenericsUtil

java.lang.Object
  org.apache.hadoop.util.GenericsUtil

public class GenericsUtil
extends Object

Contains utility methods for dealing with Java Generics.

Constructor Summary

GenericsUtil()

Method Summary

static <T> Class<T>	getClass(T t) Returns the Class object (of type Class<T>) of the argument of type T.
static <T> T[]	toArray(Class<T> c, List<T> list) Converts the given List<T> to a an array of T[].
static <T> T[]	toArray(List<T> list) Converts the given List<T> to a an array of T[].

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GenericsUtil

public GenericsUtil()

Method Detail

getClass

public static <T> Class<T> getClass(T t)

Returns the Class object (of type Class<T>) of the argument of type T.

Type Parameters:

T - The type of the argument

Parameters:

t - the object to get it class

Returns:

Class<T>

toArray

public static <T> T[] toArray(Class<T> c,
                              List<T> list)

Converts the given List<T> to a an array of T[].

Parameters:

c - the Class object of the items in the list

list - the list to convert

toArray

public static <T> T[] toArray(List<T> list)

Converts the given List<T> to a an array of T[].

Parameters:

list - the list to convert

Throws:

ArrayIndexOutOfBoundsException - if the list is empty. Use toArray(Class, List) if the list may be empty.