Package org.openforis.commons.collection

Class CollectionUtils

java.lang.Object

org.openforis.commons.collection.CollectionUtils

public abstract class CollectionUtils
extends Object

Author:

M. Togna, S. Ricci

Constructor Summary

Constructors

Constructor	Description
CollectionUtils()

Method Summary

Modifier and Type	Method	Description
static <T> Collection<T>	addIgnoreNull(Collection<T> items, T item)
static <T> List<T>	clone(List<T> list)	Creates a clone of the specified list (NOT a DEEP CLONE of the objects inside the list)
static <K,V> void	cloneValuesInto(Map<K,V> fromMap, Map<K,V> intoMap)
static <T> List<T>	copyAndFillWith(List<T> list, int newSize, T fillValue)
static <T> List<T>	copyAndFillWithNulls(List<T> list, int newSize)
static <T extends DeepComparable> boolean	deepEquals(Collection<T> coll1, Collection<T> coll2)
static <T extends DeepComparable> boolean	deepEquals(Collection<T> coll1, Collection<T> coll2, boolean ignoreId)
static <T,C extends Collection<T>> void	filter(C collection, Predicate<T> predicate)
static <T,C extends Collection<T>> List<T>	filterIntoList(C collection, Predicate<T> predicate)
static <T> T	find(Collection<T> items, Predicate<T> predicate)
static <T> T	findItem(Collection<T> items, Object key)
static <T> T	findItem(Collection<T> items, Object key, String keyPropertyName)
static <T> List<Integer>	indexOfItems(List<T> list, Collection<T> items)
static <T> Set<T>	intersect(Collection<T> listA, Collection<T> listB)
static boolean	isNotEmpty(Collection<?> collection)
static <T> List<T>	map(Collection<T> collection, Transformer<T> transformer)
static <I,T> List<I>	project(Collection<T> items, String propertyName)
static <T> void	shiftItem(List<T> list, T item, int toIndex)	Shifts the item to the specified index.
static <T> List<T>	sublistByIndexes(List<T> source, List<Integer> indexes)
static <T> Collection<T>	unmodifiableCollection(Collection<? extends T> collection)
static <T> List<T>	unmodifiableList(List<? extends T> list)	Returns an unmodifiable view of the specified list.
static <K,V> Map<K,V>	unmodifiableMap(Map<? extends K,? extends V> map)
static <T> Set<T>	unmodifiableSet(Set<? extends T> set)

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

unmodifiableList

public static <T> List<T> unmodifiableList(List<? extends T> list)

Returns an unmodifiable view of the specified list.
This method makes use of the method unmodifiableList of java.util.Collections and returns an empty list if the provided list is null.

Parameters:

list -

Returns:

See Also:

java.util.Collections.unmodifiableList

unmodifiableSet

public static <T> Set<T> unmodifiableSet(Set<? extends T> set)

unmodifiableMap

public static <K,V> Map<K,V> unmodifiableMap(Map<? extends K,? extends V> map)

unmodifiableCollection

public static <T> Collection<T> unmodifiableCollection(Collection<? extends T> collection)

shiftItem

public static <T> void shiftItem(List<T> list,
                                 T item,
                                 int toIndex)

Shifts the item to the specified index.

isNotEmpty

public static boolean isNotEmpty(Collection<?> collection)

filter

public static <T,C extends Collection<T>> void filter(C collection,
                                                            Predicate<T> predicate)

filterIntoList

public static <T,C extends Collection<T>> List<T> filterIntoList(C collection,
                                                                       Predicate<T> predicate)

find

public static <T> T find(Collection<T> items,
                         Predicate<T> predicate)

findItem

public static <T> T findItem(Collection<T> items,
                             Object key)

findItem

public static <T> T findItem(Collection<T> items,
                             Object key,
                             String keyPropertyName)

addIgnoreNull

public static <T> Collection<T> addIgnoreNull(Collection<T> items,
                                              T item)

project

public static <I,T> List<I> project(Collection<T> items,
                                          String propertyName)

deepEquals

public static <T extends DeepComparable> boolean deepEquals(Collection<T> coll1,
                                                            Collection<T> coll2)

deepEquals

public static <T extends DeepComparable> boolean deepEquals(Collection<T> coll1,
                                                            Collection<T> coll2,
                                                            boolean ignoreId)

clone

public static <T> List<T> clone(List<T> list)

Creates a clone of the specified list (NOT a DEEP CLONE of the objects inside the list)

Parameters:

list -

Returns:

cloneValuesInto

public static <K,V> void cloneValuesInto(Map<K,V> fromMap,
                                               Map<K,V> intoMap)

copyAndFillWithNulls

public static <T> List<T> copyAndFillWithNulls(List<T> list,
                                               int newSize)

copyAndFillWith

public static <T> List<T> copyAndFillWith(List<T> list,
                                          int newSize,
                                          T fillValue)

intersect

public static <T> Set<T> intersect(Collection<T> listA,
                                   Collection<T> listB)

indexOfItems

public static <T> List<Integer> indexOfItems(List<T> list,
                                             Collection<T> items)

sublistByIndexes

public static <T> List<T> sublistByIndexes(List<T> source,
                                           List<Integer> indexes)

map

public static <T> List<T> map(Collection<T> collection,
                              Transformer<T> transformer)