V
- type of subclass of ObjectId that will be stored in the map.public class ObjectIdSubclassMap<V extends ObjectId> extends Object implements Iterable<V>, ObjectIdSet
ObjectId
subclasses.
This map provides an efficient translation from any ObjectId instance to a cached subclass of ObjectId that has the same value.
If object instances are stored in only one map,
ObjectIdOwnerMap
is a more efficient
implementation.
Constructor and Description |
---|
ObjectIdSubclassMap()
Create an empty map.
|
Modifier and Type | Method and Description |
---|---|
<Q extends V> |
add(Q newValue)
Store an object for future lookup.
|
<Q extends V> |
addIfAbsent(Q newValue)
Store an object for future lookup.
|
void |
clear()
Remove all entries from this map.
|
boolean |
contains(AnyObjectId toFind)
Returns true if the objectId is contained within the collection.
|
V |
get(AnyObjectId toFind)
Lookup an existing mapping.
|
boolean |
isEmpty()
Whether
size() is 0. |
Iterator<V> |
iterator() |
int |
size()
Get number of objects in map
|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
forEach, spliterator
public void clear()
public V get(AnyObjectId toFind)
toFind
- the object identifier to find.public boolean contains(AnyObjectId toFind)
Returns true if this map contains the specified object.
contains
in interface ObjectIdSet
toFind
- the objectId to findpublic <Q extends V> void add(Q newValue)
An existing mapping for must not be in this map. Callers must
first call get(AnyObjectId)
to verify there is no current
mapping prior to adding a new mapping, or use
addIfAbsent(ObjectId)
.
newValue
- the object to store.public <Q extends V> V addIfAbsent(Q newValue)
Stores newValue
, but only if there is not already an object for
the same object name. Callers can tell if the value is new by checking
the return value with reference equality:
V obj = ...; boolean wasNew = map.addIfAbsent(obj) == obj;
newValue
- the object to store.newValue
if stored, or the prior value already stored and
that would have been returned had the caller used
get(newValue)
first.public int size()
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