java.lang.Object
- org.springframework.util.AutoPopulatingList<E>

All Implemented Interfaces:
Serializable, Iterable<E>, Collection<E>, List<E>
```
public class AutoPopulatingList<E>
extends Object
implements List<E>, Serializable
```
Simple List wrapper class that allows for elements to be automatically populated as they are requested. This is particularly useful for data binding to Lists, allowing for elements to be created and added to the List in a "just in time" fashion.
Note: This class is not thread-safe. To create a thread-safe version, use the Collections.synchronizedList(java.util.List<T>) utility methods.
Inspired by LazyList from Commons Collections.
Since:
2.0
Author:
Rob Harrop, Juergen Hoeller
See Also:
Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static interface`	`AutoPopulatingList.ElementFactory<E>`	Factory interface for creating elements for an index-based access data structure such as a `List`.
`static class`	`AutoPopulatingList.ElementInstantiationException`	Exception to be thrown from ElementFactory.

Constructor Summary

Constructors
Constructor	Description
`AutoPopulatingList(Class<? extends E> elementClass)`	Creates a new `AutoPopulatingList` that is backed by a standard `ArrayList` and adds new instances of the supplied `element Class` to the backing `List` on demand.
`AutoPopulatingList(List<E> backingList, Class<? extends E> elementClass)`	Creates a new `AutoPopulatingList` that is backed by the supplied `List` and adds new instances of the supplied `element Class` to the backing `List` on demand.
`AutoPopulatingList(List<E> backingList, AutoPopulatingList.ElementFactory<E> elementFactory)`	Creates a new `AutoPopulatingList` that is backed by the supplied `List` and creates new elements on demand using the supplied `AutoPopulatingList.ElementFactory`.
`AutoPopulatingList(AutoPopulatingList.ElementFactory<E> elementFactory)`	Creates a new `AutoPopulatingList` that is backed by a standard `ArrayList` and creates new elements on demand using the supplied `AutoPopulatingList.ElementFactory`.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`add(int index, E element)`
`boolean`	`add(E o)`
`boolean`	`addAll(int index, Collection<? extends E> c)`
`boolean`	`addAll(Collection<? extends E> c)`
`void`	`clear()`
`boolean`	`contains(Object o)`
`boolean`	`containsAll(Collection<?> c)`
`boolean`	`equals(Object other)`
`E`	`get(int index)`	Get the element at the supplied index, creating it if there is no element at that index.
`int`	`hashCode()`
`int`	`indexOf(Object o)`
`boolean`	`isEmpty()`
`Iterator<E>`	`iterator()`
`int`	`lastIndexOf(Object o)`
`ListIterator<E>`	`listIterator()`
`ListIterator<E>`	`listIterator(int index)`
`E`	`remove(int index)`
`boolean`	`remove(Object o)`
`boolean`	`removeAll(Collection<?> c)`
`boolean`	`retainAll(Collection<?> c)`
`E`	`set(int index, E element)`
`int`	`size()`
`List<E>`	`subList(int fromIndex, int toIndex)`
`Object[]`	`toArray()`
`<T> T[]`	`toArray(T[] a)`

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

Methods inherited from interface java.util.Collection
parallelStream, removeIf, stream, toArray

Methods inherited from interface java.lang.Iterable
forEach

Methods inherited from interface java.util.List
replaceAll, sort, spliterator

- Constructor Detail
  - AutoPopulatingList
```
public AutoPopulatingList(Class<? extends E> elementClass)
```
    Creates a new AutoPopulatingList that is backed by a standard ArrayList and adds new instances of the supplied element Class to the backing List on demand.
  - AutoPopulatingList
```
public AutoPopulatingList(List<E> backingList,
                          Class<? extends E> elementClass)
```
    Creates a new AutoPopulatingList that is backed by the supplied List and adds new instances of the supplied element Class to the backing List on demand.
  - AutoPopulatingList
```
public AutoPopulatingList(AutoPopulatingList.ElementFactory<E> elementFactory)
```
    Creates a new AutoPopulatingList that is backed by a standard ArrayList and creates new elements on demand using the supplied AutoPopulatingList.ElementFactory.
  - AutoPopulatingList
```
public AutoPopulatingList(List<E> backingList,
                          AutoPopulatingList.ElementFactory<E> elementFactory)
```
    Creates a new AutoPopulatingList that is backed by the supplied List and creates new elements on demand using the supplied AutoPopulatingList.ElementFactory.
- Method Detail
  - add
```
public void add(int index,
                E element)
```
    Specified by:
    add in interface List<E>
  - add
```
public boolean add(E o)
```
    Specified by:
    add in interface Collection<E>
    Specified by:
    add in interface List<E>
  - addAll
```
public boolean addAll(Collection<? extends E> c)
```
    Specified by:
    addAll in interface Collection<E>
    Specified by:
    addAll in interface List<E>
  - addAll
```
public boolean addAll(int index,
                      Collection<? extends E> c)
```
    Specified by:
    addAll in interface List<E>
  - clear
```
public void clear()
```
    Specified by:
    clear in interface Collection<E>
    Specified by:
    clear in interface List<E>
  - contains
```
public boolean contains(Object o)
```
    Specified by:
    contains in interface Collection<E>
    Specified by:
    contains in interface List<E>
  - containsAll
```
public boolean containsAll(Collection<?> c)
```
    Specified by:
    containsAll in interface Collection<E>
    Specified by:
    containsAll in interface List<E>
  - get
```
public E get(int index)
```
    Get the element at the supplied index, creating it if there is no element at that index.
    Specified by:
    get in interface List<E>
  - indexOf
```
public int indexOf(Object o)
```
    Specified by:
    indexOf in interface List<E>
  - isEmpty
```
public boolean isEmpty()
```
    Specified by:
    isEmpty in interface Collection<E>
    Specified by:
    isEmpty in interface List<E>
  - iterator
```
public Iterator<E> iterator()
```
    Specified by:
    iterator in interface Collection<E>
    Specified by:
    iterator in interface Iterable<E>
    Specified by:
    iterator in interface List<E>
  - lastIndexOf
```
public int lastIndexOf(Object o)
```
    Specified by:
    lastIndexOf in interface List<E>
  - listIterator
```
public ListIterator<E> listIterator()
```
    Specified by:
    listIterator in interface List<E>
  - listIterator
```
public ListIterator<E> listIterator(int index)
```
    Specified by:
    listIterator in interface List<E>
  - remove
```
public E remove(int index)
```
    Specified by:
    remove in interface List<E>
  - remove
```
public boolean remove(Object o)
```
    Specified by:
    remove in interface Collection<E>
    Specified by:
    remove in interface List<E>
  - removeAll
```
public boolean removeAll(Collection<?> c)
```
    Specified by:
    removeAll in interface Collection<E>
    Specified by:
    removeAll in interface List<E>
  - retainAll
```
public boolean retainAll(Collection<?> c)
```
    Specified by:
    retainAll in interface Collection<E>
    Specified by:
    retainAll in interface List<E>
  - set
```
public E set(int index,
             E element)
```
    Specified by:
    set in interface List<E>
  - size
```
public int size()
```
    Specified by:
    size in interface Collection<E>
    Specified by:
    size in interface List<E>
  - subList
```
public List<E> subList(int fromIndex,
                       int toIndex)
```
    Specified by:
    subList in interface List<E>
  - toArray
```
public Object[] toArray()
```
    Specified by:
    toArray in interface Collection<E>
    Specified by:
    toArray in interface List<E>
  - toArray
```
public <T> T[] toArray(T[] a)
```
    Specified by:
    toArray in interface Collection<E>
    Specified by:
    toArray in interface List<E>
  - equals
```
public boolean equals(Object other)
```
    Specified by:
    equals in interface Collection<E>
    Specified by:
    equals in interface List<E>
    Overrides:
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Specified by:
    hashCode in interface Collection<E>
    Specified by:
    hashCode in interface List<E>
    Overrides:
    hashCode in class Object

Class AutoPopulatingList<E>

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.Collection

Methods inherited from interface java.lang.Iterable

Methods inherited from interface java.util.List

Constructor Detail

AutoPopulatingList

AutoPopulatingList

AutoPopulatingList

AutoPopulatingList

Method Detail

add

add

addAll

addAll

clear

contains

containsAll

get

indexOf

isEmpty

iterator

lastIndexOf

listIterator

listIterator

remove

remove

removeAll

retainAll

set

size

subList

toArray

toArray

equals

hashCode