com.flowable.platform.expressions

Class FlowableExpressionCollectionUtils

java.lang.Object

com.flowable.platform.expressions.FlowableExpressionCollectionUtils

public class FlowableExpressionCollectionUtils
extends Object

Expression Bean Name: flwCollectionUtils Offers utilities to work with Collections (Lists, Sets etc.) as well as Maps.

Constructor Summary

Constructors

Constructor and Description
FlowableExpressionCollectionUtils()

Method Summary

Modifier and Type	Method and Description
<T> List<T>	distinct(Collection<T> collection) Deletes all duplicates from a list while retaining order.
List	emptyList() Creates a new list, for instance to be used in an Initialize Variables Service Task.
Map	emptyMap() Creates a new map, for instance to be used in an Initialize Variables Service Task.
<T> List<T>	listWithElements(T... elements) Creates a new list with as many elements as desired.
<T> List<T>	mergeCollections(Collection<T>... collections) Merges several collections into a list.
<K,V> Map<K,V>	updateMap(Map<K,V> map, K key, V newValue) Inserts or updates a value depending on whether it exists or not and returns the updated map.

Methods inherited from class java.lang.Object

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

Constructor Detail

FlowableExpressionCollectionUtils

public FlowableExpressionCollectionUtils()

Method Detail

emptyList

public List emptyList()

Creates a new list, for instance to be used in an Initialize Variables Service Task. Example: #{flwCollectionUtils.emptyList()}

Returns:

An empty List

emptyMap

public Map emptyMap()

Creates a new map, for instance to be used in an Initialize Variables Service Task. Example: #{flwCollectionUtils.emptyMap()}

Returns:

An empty Map

listWithElements

@SafeVarargs
public final <T> List<T> listWithElements(T... elements)

Creates a new list with as many elements as desired. Example: #{flwCollectionUtils.listWithElements('green', 'yellow', 'red')}

Type Parameters:

T - the type of the list

Parameters:

elements - the elements to add to the new collection

Returns:

A new list with the given elements

mergeCollections

@SafeVarargs
public final <T> List<T> mergeCollections(Collection<T>... collections)

Merges several collections into a list. #{flwCollectionUtils.mergeCollections(candidateGroupIds, newGroups)}

Type Parameters:

T - type of the collection

Parameters:

collections - collections to be merged

Returns:

The merged collections

distinct

public <T> List<T> distinct(Collection<T> collection)

Deletes all duplicates from a list while retaining order. Example: #{flwCollectionUtils.distinct(myListWithDuplicates)}

Type Parameters:

T - type of the list

Parameters:

collection - the base collection

Returns:

List without any duplicates

updateMap

public <K,V> Map<K,V> updateMap(Map<K,V> map,
                                K key,
                                V newValue)

Inserts or updates a value depending on whether it exists or not and returns the updated map.

Type Parameters:

K - the type of the key

V - the type of the value

Parameters:

map - the map to be updated

key - the key within the map to be updated

newValue - the new value

Returns:

The updated map