public class GrowthList extends AbstractSerializableListDecorator
List to make it seamlessly grow when
indices larger than the list size are used on add and set,
avoiding most IndexOutOfBoundsExceptions.
This class avoids errors by growing when a set or add method would normally throw an IndexOutOfBoundsException. Note that IndexOutOfBoundsException IS returned for invalid negative indices.
Trying to set or add to an index larger than the size will cause the list
to grow (using null elements). Clearly, care must be taken
not to use excessively large indices, as the internal list will grow to
match.
Trying to use any method other than add or set with an invalid index will call the underlying list and probably result in an IndexOutOfBoundsException.
Take care when using this list with null values, as
null is the value added when growing the list.
All sub-lists will access the underlying list directly, and will throw IndexOutOfBoundsExceptions.
This class differs from LazyList because here growth occurs on
set and add, where LazyList grows on get. However, they
can be used together by decorating twice.
LazyList,
Serialized Formcollection| Modifier | Constructor and Description |
|---|---|
|
GrowthList()
Constructor that uses an ArrayList internally.
|
|
GrowthList(int initialSize)
Constructor that uses an ArrayList internally.
|
protected |
GrowthList(List list)
Constructor that wraps (not copies).
|
| Modifier and Type | Method and Description |
|---|---|
void |
add(int index,
Object element)
Decorate the add method to perform the growth behaviour.
|
boolean |
addAll(int index,
Collection coll)
Decorate the addAll method to perform the growth behaviour.
|
static List |
decorate(List list)
Factory method to create a growth list.
|
Object |
set(int index,
Object element)
Decorate the set method to perform the growth behaviour.
|
get, getList, indexOf, lastIndexOf, listIterator, listIterator, remove, subListadd, addAll, clear, contains, containsAll, equals, getCollection, hashCode, isEmpty, iterator, remove, removeAll, retainAll, size, toArray, toArray, toStringpublic GrowthList()
public GrowthList(int initialSize)
initialSize - the initial size of the ArrayListIllegalArgumentException - if initial size is invalidprotected GrowthList(List list)
list - the list to decorate, must not be nullIllegalArgumentException - if list is nullpublic static List decorate(List list)
list - the list to decorate, must not be nullIllegalArgumentException - if list is nullpublic void add(int index,
Object element)
If the requested index is greater than the current size, the list will
grow to the new size. Indices between the old size and the requested
size will be filled with null.
If the index is less than the current size, the value will be added to the underlying list directly. If the index is less than zero, the underlying list is called, which will probably throw an IndexOutOfBoundsException.
add in interface Listadd in class AbstractListDecoratorindex - the index to add atelement - the object to add at the specified indexUnsupportedOperationException - if the underlying list doesn't implement setClassCastException - if the underlying list rejects the elementIllegalArgumentException - if the underlying list rejects the elementpublic boolean addAll(int index,
Collection coll)
If the requested index is greater than the current size, the list will
grow to the new size. Indices between the old size and the requested
size will be filled with null.
If the index is less than the current size, the values will be added to the underlying list directly. If the index is less than zero, the underlying list is called, which will probably throw an IndexOutOfBoundsException.
addAll in interface ListaddAll in class AbstractListDecoratorindex - the index to add atcoll - the collection to add at the specified indexUnsupportedOperationException - if the underlying list doesn't implement setClassCastException - if the underlying list rejects the elementIllegalArgumentException - if the underlying list rejects the elementpublic Object set(int index, Object element)
If the requested index is greater than the current size, the list will
grow to the new size. Indices between the old size and the requested
size will be filled with null.
If the index is less than the current size, the value will be set onto the underlying list directly. If the index is less than zero, the underlying list is called, which will probably throw an IndexOutOfBoundsException.
set in interface Listset in class AbstractListDecoratorindex - the index to setelement - the object to set at the specified indexUnsupportedOperationException - if the underlying list doesn't implement setClassCastException - if the underlying list rejects the elementIllegalArgumentException - if the underlying list rejects the elementCopyright © 2001–2015 The Apache Software Foundation. All rights reserved.