org.eclipse.jetty.util
public class LazyList extends java.lang.Object implements java.lang.Cloneable, java.io.Serializable
Collections.EMPTY_LIST
or
Collections.singletonList(Object)
where possible.
LazyList works by passing an opaque representation of the list in
and out of all the LazyList methods. This opaque object is either
null for an empty list, an Object for a list with a single entry
or an ArrayList
for a list of items.
Object lazylist =null; while(loopCondition) { Object item = getItem(); if (item.isToBeAdded()) lazylist = LazyList.add(lazylist,item); } return LazyList.getList(lazylist);An ArrayList of default size is used as the initial LazyList.
List
,
Serialized FormModifier and Type | Method and Description |
---|---|
static java.lang.Object |
add(java.lang.Object list,
int index,
java.lang.Object item)
Add an item to a LazyList
|
static java.lang.Object |
add(java.lang.Object list,
java.lang.Object item)
Add an item to a LazyList
|
static java.lang.Object |
addArray(java.lang.Object list,
java.lang.Object[] array)
Add the contents of an array to a LazyList
|
static java.lang.Object |
addCollection(java.lang.Object list,
java.util.Collection<?> collection)
Add the contents of a Collection to a LazyList
|
static <T> T[] |
addToArray(T[] array,
T item,
java.lang.Class<?> type)
Add element to an array
|
static <E> java.util.List<E> |
array2List(E[] array) |
static java.lang.Object |
clone(java.lang.Object list) |
static boolean |
contains(java.lang.Object list,
java.lang.Object item) |
static java.lang.Object |
ensureSize(java.lang.Object list,
int initialSize)
Ensure the capacity of the underlying list.
|
static <E> E |
get(java.lang.Object list,
int i)
Get item from the list
|
static <E> java.util.List<E> |
getList(java.lang.Object list)
Get the real List from a LazyList.
|
static <E> java.util.List<E> |
getList(java.lang.Object list,
boolean nullForEmpty)
Get the real List from a LazyList.
|
static <E> java.util.Iterator<E> |
iterator(java.lang.Object list) |
static <E> java.util.ListIterator<E> |
listIterator(java.lang.Object list) |
static java.lang.Object |
remove(java.lang.Object list,
int i) |
static java.lang.Object |
remove(java.lang.Object list,
java.lang.Object o) |
static <T> T[] |
removeFromArray(T[] array,
java.lang.Object item) |
static int |
size(java.lang.Object list)
The size of a lazy List
|
static java.lang.Object |
toArray(java.lang.Object list,
java.lang.Class<?> clazz)
Convert a lazylist to an array
|
static java.lang.String |
toString(java.lang.Object list) |
static java.lang.String[] |
toStringArray(java.lang.Object list) |
public static java.lang.Object add(java.lang.Object list, java.lang.Object item)
list
- The list to add to or null if none yet created.item
- The item to add.public static java.lang.Object add(java.lang.Object list, int index, java.lang.Object item)
list
- The list to add to or null if none yet created.index
- The index to add the item at.item
- The item to add.public static java.lang.Object addCollection(java.lang.Object list, java.util.Collection<?> collection)
list
- The list to add to or null if none yet created.collection
- The Collection whose contents should be added.public static java.lang.Object addArray(java.lang.Object list, java.lang.Object[] array)
list
- The list to add to or null if none yet created.array
- The array whose contents should be added.public static java.lang.Object ensureSize(java.lang.Object list, int initialSize)
public static java.lang.Object remove(java.lang.Object list, java.lang.Object o)
public static java.lang.Object remove(java.lang.Object list, int i)
public static <E> java.util.List<E> getList(java.lang.Object list)
list
- A LazyList returned from LazyList.add(Object)public static <E> java.util.List<E> getList(java.lang.Object list, boolean nullForEmpty)
list
- A LazyList returned from LazyList.add(Object) or nullnullForEmpty
- If true, null is returned instead of an
empty list.public static java.lang.String[] toStringArray(java.lang.Object list)
public static java.lang.Object toArray(java.lang.Object list, java.lang.Class<?> clazz)
list
- The list to convertclazz
- The class of the array, which may be a primitive typepublic static int size(java.lang.Object list)
list
- A LazyList returned from LazyList.add(Object) or nullpublic static <E> E get(java.lang.Object list, int i)
list
- A LazyList returned from LazyList.add(Object) or nulli
- int indexpublic static boolean contains(java.lang.Object list, java.lang.Object item)
public static java.lang.Object clone(java.lang.Object list)
public static java.lang.String toString(java.lang.Object list)
public static <E> java.util.Iterator<E> iterator(java.lang.Object list)
public static <E> java.util.ListIterator<E> listIterator(java.lang.Object list)
public static <E> java.util.List<E> array2List(E[] array)
array
- Any array of objectarray
.public static <T> T[] addToArray(T[] array, T item, java.lang.Class<?> type)
array
- The array to add to (or null)item
- The item to addtype
- The type of the array (in case of null array)public static <T> T[] removeFromArray(T[] array, java.lang.Object item)
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