com.vividsolutions.jump.util

Class CollectionUtil

java.lang.Object

com.vividsolutions.jump.util.CollectionUtil

public class CollectionUtil
extends Object

Constructor Summary

Constructors

Constructor and Description
CollectionUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static void	addIfNotNull(Object item, Collection collection)
static Collection	collect(Collection collection, Block block) The Smalltalk #collect method.
static List	combinations(List original) Returns a List of Lists: all combinations of the elements of the given List.
static List	combinations(List original, int maxCombinationSize) Returns a List of Lists: all combinations of the elements of the given List.
static List	combinations(List original, int maxCombinationSize, Object mandatoryItem) Returns a List of Lists: all combinations of the elements of the given List.
static Collection	concatenate(Collection collections)
static boolean	containsReference(Object[] objects, Object o)
static Map	createMap(Class mapClass, Object[] alternatingKeysAndValues)
static Map	createMap(Object[] alternatingKeysAndValues)
static Collection	filterByClass(Collection collection, Class c) Modifies and returns the collection.
static Object	get(Class c, Map map)
static Object	ifNotIn(Object o, Collection c, Object alternative)
static int	indexOf(Object o, Object[] objects)
static Map	inverse(Map map)
static List[]	keysAndCorrespondingValues(Map map) The nth key corresponds to the nth value
static Object	randomElement(List list)
static Collection	removeDuplicates(Collection original) Brute force, for when HashSet and TreeSet won't work (e.g.
static void	removeKeys(Collection keys, Map map)
static void	resize(List list, int newSize)
static List	reverse(List list)
static SortedSet	reverseSortedSet(int[] ints)
static Collection	select(Collection collection, Block block) The Smalltalk #select method.
static void	setIfNull(int i, List list, String value)
static Collection	stretch(Collection source, Collection destination, int destinationSize) Data is evenly discarded or duplicated to attain the new size

Methods inherited from class java.lang.Object

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

Constructor Detail

CollectionUtil

public CollectionUtil()

Method Detail

combinations

public static List combinations(List original,
                int maxCombinationSize)

Returns a List of Lists: all combinations of the elements of the given List.

Parameters:

maxCombinationSize - combinations larger than this value are discarded

inverse

public static Map inverse(Map map)

combinations

public static List combinations(List original,
                int maxCombinationSize,
                Object mandatoryItem)

Returns a List of Lists: all combinations of the elements of the given List.

Parameters:

maxCombinationSize - combinations larger than this value are discarded

mandatoryItem - an item that all returned combinations must contain, or null to leave unspecified

combinations

public static List combinations(List original)

Returns a List of Lists: all combinations of the elements of the given List.

removeKeys

public static void removeKeys(Collection keys,
              Map map)

keysAndCorrespondingValues

public static List[] keysAndCorrespondingValues(Map map)

The nth key corresponds to the nth value

concatenate

public static Collection concatenate(Collection collections)

randomElement

public static Object randomElement(List list)

reverseSortedSet

public static SortedSet reverseSortedSet(int[] ints)

reverse

public static List reverse(List list)

stretch

public static Collection stretch(Collection source,
                 Collection destination,
                 int destinationSize)

Data is evenly discarded or duplicated to attain the new size

ifNotIn

public static Object ifNotIn(Object o,
             Collection c,
             Object alternative)

setIfNull

public static void setIfNull(int i,
             List list,
             String value)

resize

public static void resize(List list,
          int newSize)

containsReference

public static boolean containsReference(Object[] objects,
                        Object o)

indexOf

public static int indexOf(Object o,
          Object[] objects)

removeDuplicates

public static Collection removeDuplicates(Collection original)

Brute force, for when HashSet and TreeSet won't work (e.g. #hashCode implementation isn't appropriate). The original Collection is not modified.

addIfNotNull

public static void addIfNotNull(Object item,
                Collection collection)

filterByClass

public static Collection filterByClass(Collection collection,
                       Class c)

Modifies and returns the collection.

createMap

public static Map createMap(Object[] alternatingKeysAndValues)

createMap

public static Map createMap(Class mapClass,
            Object[] alternatingKeysAndValues)

collect

public static Collection collect(Collection collection,
                 Block block)

The Smalltalk #collect method.

select

public static Collection select(Collection collection,
                Block block)

The Smalltalk #select method.

get

public static Object get(Class c,
         Map map)