@GwtCompatible public abstract class ForwardingSortedMap<K,V> extends ForwardingMap<K,V> implements SortedMap<K,V>
Warning: The methods of ForwardingSortedMap
forward indiscriminately to
the methods of the delegate. For example, overriding ForwardingMap.put(K, V)
alone will not change
the behavior of ForwardingMap.putAll(java.util.Map<? extends K, ? extends V>)
, which can lead to unexpected behavior. In this case, you should
override putAll
as well, either providing your own implementation, or delegating to the
provided standardPutAll
method.
default
method warning: This class does not forward calls to default
methods. Instead, it inherits their default implementations. When those implementations
invoke methods, they invoke methods on the ForwardingSortedMap
.
Each of the standard
methods, where appropriate, use the comparator of the map to test
equality for both keys and values, unlike ForwardingMap
.
The standard
methods and the collection views they return are not guaranteed to be
thread-safe, even when all of the methods that they depend on are thread-safe.
Modifier and Type | Class and Description |
---|---|
protected class |
ForwardingSortedMap.StandardKeySet
A sensible implementation of
SortedMap.keySet() in terms of the methods of ForwardingSortedMap . |
ForwardingMap.StandardEntrySet, ForwardingMap.StandardValues
Modifier | Constructor and Description |
---|---|
protected |
ForwardingSortedMap()
Constructor for use by subclasses.
|
Modifier and Type | Method and Description |
---|---|
Comparator<? super K> |
comparator()
Returns the comparator used to order the keys in this map, or
null if this map uses the natural ordering of its keys. |
protected abstract SortedMap<K,V> |
delegate()
Returns the backing delegate instance that methods are forwarded to.
|
K |
firstKey()
Returns the first (lowest) key currently in this map.
|
SortedMap<K,V> |
headMap(K toKey)
Returns a view of the portion of this map whose keys are
strictly less than
toKey . |
K |
lastKey()
Returns the last (highest) key currently in this map.
|
protected boolean |
standardContainsKey(@Nullable Object key)
A sensible definition of
ForwardingMap.containsKey(java.lang.Object) in terms of the firstKey() method of
tailMap(K) . |
protected SortedMap<K,V> |
standardSubMap(K fromKey,
K toKey)
A sensible default implementation of
subMap(Object, Object) in terms of headMap(Object) and tailMap(Object) . |
SortedMap<K,V> |
subMap(K fromKey,
K toKey)
Returns a view of the portion of this map whose keys range from
fromKey , inclusive, to toKey , exclusive. |
SortedMap<K,V> |
tailMap(K fromKey)
Returns a view of the portion of this map whose keys are
greater than or equal to
fromKey . |
clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, put, putAll, remove, size, standardClear, standardContainsValue, standardEquals, standardHashCode, standardIsEmpty, standardPutAll, standardRemove, standardToString, values
toString
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
clear, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, equals, forEach, get, getOrDefault, hashCode, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size
protected ForwardingSortedMap()
protected abstract SortedMap<K,V> delegate()
ForwardingObject
ForwardingSet.delegate()
. Concrete subclasses override this method to supply the
instance being decorated.delegate
in class ForwardingMap<K,V>
public Comparator<? super K> comparator()
java.util.SortedMap
null
if this map uses the natural ordering of its keys.comparator
in interface SortedMap<K,V>
null
if this map uses the natural ordering
of its keyspublic K firstKey()
java.util.SortedMap
public SortedMap<K,V> headMap(K toKey)
java.util.SortedMap
toKey
. The returned map is backed
by this map, so changes in the returned map are reflected in
this map, and vice-versa. The returned map supports all
optional map operations that this map supports.
The returned map will throw an IllegalArgumentException
on an attempt to insert a key outside its range.
public K lastKey()
java.util.SortedMap
public SortedMap<K,V> subMap(K fromKey, K toKey)
java.util.SortedMap
fromKey
, inclusive, to toKey
, exclusive. (If
fromKey
and toKey
are equal, the returned map
is empty.) The returned map is backed by this map, so changes
in the returned map are reflected in this map, and vice-versa.
The returned map supports all optional map operations that this
map supports.
The returned map will throw an IllegalArgumentException
on an attempt to insert a key outside its range.
public SortedMap<K,V> tailMap(K fromKey)
java.util.SortedMap
fromKey
. The returned map is
backed by this map, so changes in the returned map are
reflected in this map, and vice-versa. The returned map
supports all optional map operations that this map supports.
The returned map will throw an IllegalArgumentException
on an attempt to insert a key outside its range.
@Beta protected boolean standardContainsKey(@Nullable Object key)
ForwardingMap.containsKey(java.lang.Object)
in terms of the firstKey()
method of
tailMap(K)
. If you override tailMap(K)
, you may wish to override ForwardingMap.containsKey(java.lang.Object)
to forward to this implementation.standardContainsKey
in class ForwardingMap<K,V>
@Beta protected SortedMap<K,V> standardSubMap(K fromKey, K toKey)
subMap(Object, Object)
in terms of headMap(Object)
and tailMap(Object)
. In some situations, you may wish to override
subMap(Object, Object)
to forward to this implementation.Copyright © 2010–2019. All rights reserved.