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package edu.rice.cs.util;

import java.lang.reflect.Array;

import java.util.ArrayList;

/** A class to provide some convenient Iterable operations as static methods.

* It's abstract to prevent (useless) instantiation, though it can be subclassed

* to provide convenient namespace importation of its methods.

*/

public abstract class IterableOps {

/** Convert an Iterable to an array.

*

* @param iter Iterable object to be converted.

* @param <T> Parameterized type of the iterable.

* @return the array NOTE: at compile time the type of the array is Object[]; can cause ClassCastException.

*/

@SuppressWarnings({"unchecked","rawtypes"})

public static <T> T[] toArray(Iterable<T> iter, Class<T> elemType) {

ArrayList<T> al = (ArrayList<T>) new ArrayList();

for (T elem : iter) {

al.add(elem);

}

int size = al.size();

T[] array = (T[]) Array.newInstance(elemType, size);

return al.toArray(array);

}

}