Package org.dashbuilder.common.client

Class CollectionUtils

java.lang.Object

org.dashbuilder.common.client.CollectionUtils

public class CollectionUtils
extends Object

Constructor Summary

Constructors

Constructor	Description
CollectionUtils()

Method Summary

Modifier and Type	Method	Description
static Map	getCardinalityMap(Collection coll)	Returns a Map mapping each unique element in the given Collection to an Integer representing the number of occurrences of that element in the Collection.
static Collection	intersection(Collection a, Collection b)	Returns a Collection containing the intersection of the given Collections.

Methods inherited from class java.lang.Object

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

Constructor Detail

CollectionUtils

public CollectionUtils()

Method Detail

intersection

public static Collection intersection(Collection a,
                                      Collection b)

Returns a Collection containing the intersection of the given Collections.

The cardinality of each element in the returned Collection will be equal to the minimum of the cardinality of that element in the two given Collections.

Parameters:

a - the first collection, must not be null

b - the second collection, must not be null

Returns:

the intersection of the two collections

getCardinalityMap

public static Map getCardinalityMap(Collection coll)

Returns a Map mapping each unique element in the given Collection to an Integer representing the number of occurrences of that element in the Collection.

Only those elements present in the collection will appear as keys in the map.

Parameters:

coll - the collection to get the cardinality map for, must not be null

Returns:

the populated cardinality map