com.espertech.esper.collection

Class CombinationEnumeration

java.lang.Object

com.espertech.esper.collection.CombinationEnumeration

All Implemented Interfaces:

Enumeration<Object[]>

public class CombinationEnumeration
extends Object
implements Enumeration<Object[]>

Provided a 2-dimensional array of values, provide all possible combinations:

     For example, an array { {1}, {"A", "B"}, {"X", "Y"} } provides these combinations:
        1 A X
        1 A Y
        1 B X
        1 B Y
 

. Usage Note: Do not hold on to the returned object array as nextElement() returns the same array with changed values for each enumeration.

Each array element must be non-null and length 1 or more.

Does not detect duplicates in values.

Allows any number for the first dimension.

The algorithm adds 1 to the right and overflows until done.

Constructor Summary

Constructors

Constructor and Description
CombinationEnumeration(Object[][] combinations)

Method Summary

Modifier and Type	Method and Description
static CombinationEnumeration	fromZeroBasedRanges(int[] zeroBasedRanges)
boolean	hasMoreElements()
Object[]	nextElement()

Methods inherited from class java.lang.Object

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

Constructor Detail

CombinationEnumeration

public CombinationEnumeration(Object[][] combinations)

Method Detail

fromZeroBasedRanges

public static CombinationEnumeration fromZeroBasedRanges(int[] zeroBasedRanges)

hasMoreElements

public boolean hasMoreElements()

Specified by:

hasMoreElements in interface Enumeration<Object[]>

nextElement

public Object[] nextElement()

Specified by:

nextElement in interface Enumeration<Object[]>