org.pentaho.aggdes.util

Class AggDesUtil

java.lang.Object

java.util.BitSet

org.pentaho.aggdes.util.AggDesUtil

All Implemented Interfaces:

Serializable, Cloneable

public class AggDesUtil
extends BitSet

Miscellaneous utility functions for the Aggregate Designer.

See Also:

Serialized Form

Method Summary

Methods

Modifier and Type	Method and Description
static <T> List<T>	cast(List<?> list) Casts a List to a List with a different element type.
static BigInteger	countCombinations(int n, int k) Computes the Binomial coefficient.

Methods inherited from class java.util.BitSet

and, andNot, cardinality, clear, clear, clear, clone, equals, flip, flip, get, get, hashCode, intersects, isEmpty, length, nextClearBit, nextSetBit, or, previousClearBit, previousSetBit, set, set, set, set, size, toByteArray, toLongArray, toString, valueOf, valueOf, valueOf, valueOf, xor

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

countCombinations

public static BigInteger countCombinations(int n,
                           int k)

Computes the Binomial coefficient.

Informally, if there are n pizza toppings then the binomial coefficient C(n, k) gives the number of ways to create a pizza that has k toppings.

Parameters:

n - N

k - R

Returns:

binomial coefficient C(n, k)

cast

public static <T> List<T> cast(List<?> list)

Casts a List to a List with a different element type.

Parameters:

list - List

Returns:

List of desired type