java.lang.Object
- org.camunda.bpm.engine.impl.util.CollectionUtil

```
public class CollectionUtil
extends java.lang.Object
```
helper/convience methods for working with collections.

Author:

Joram Barrez

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static <S,T> void`	`addCollectionToMapOfSets(java.util.Map<S,java.util.Set<T>> map, S key, java.util.Collection<T> values)`
`static <S,T> void`	`addToMapOfLists(java.util.Map<S,java.util.List<T>> map, S key, T value)`
`static <S,T> void`	`addToMapOfSets(java.util.Map<S,java.util.Set<T>> map, S key, T value)`
`static <T> java.util.List<T>`	`asArrayList(T[] values)`	Arrays.asList cannot be reliably used for SQL parameters on MyBatis < 3.3.0
`static <T> java.util.Set<T>`	`asHashSet(T... elements)`
`static <T> java.util.List<T>`	`collectInList(java.util.Iterator<T> iterator)`
`static boolean`	`isEmpty(java.util.Collection<?> collection)`
`static <T> java.util.List<java.util.List<T>>`	`partition(java.util.List<T> list, int partitionSize)`	Chops a list into non-view sublists of length partitionSize.
`static java.util.Map<java.lang.String,java.lang.Object>`	`singletonMap(java.lang.String key, java.lang.Object value)`	Helper method that creates a singleton map.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

singletonMap

public static java.util.Map<java.lang.String,java.lang.Object> singletonMap(java.lang.String key,
                                                                                  java.lang.Object value)

Helper method that creates a singleton map. Alternative for Collections.singletonMap(), since that method returns a generic typed map depending on the input type, but we often need a map.

asArrayList
```
public static <T> java.util.List<T> asArrayList(T[] values)
```
Arrays.asList cannot be reliably used for SQL parameters on MyBatis < 3.3.0

asHashSet

public static <T> java.util.Set<T> asHashSet(T... elements)

addToMapOfLists

public static <S,T> void addToMapOfLists(java.util.Map<S,java.util.List<T>> map,
                                               S key,
                                               T value)

addToMapOfSets

public static <S,T> void addToMapOfSets(java.util.Map<S,java.util.Set<T>> map,
                                              S key,
                                              T value)

addCollectionToMapOfSets

public static <S,T> void addCollectionToMapOfSets(java.util.Map<S,java.util.Set<T>> map,
                                                        S key,
                                                        java.util.Collection<T> values)

partition

public static <T> java.util.List<java.util.List<T>> partition(java.util.List<T> list,
                                                              int partitionSize)

Chops a list into non-view sublists of length partitionSize. Note: the argument list may be included in the result.

collectInList

public static <T> java.util.List<T> collectInList(java.util.Iterator<T> iterator)

isEmpty

public static boolean isEmpty(java.util.Collection<?> collection)

Class CollectionUtil