com.google.common.collect

Class ForwardingNavigableMap<K,V>

java.lang.Object

com.google.common.collect.ForwardingObject

com.google.common.collect.ForwardingMap<K,V>

com.google.common.collect.ForwardingSortedMap<K,V>

com.google.common.collect.ForwardingNavigableMap<K,V>

All Implemented Interfaces:

Map<K,V>, NavigableMap<K,V>, SortedMap<K,V>

public abstract class ForwardingNavigableMap<K,V>
extends ForwardingSortedMap<K,V>
implements NavigableMap<K,V>

A navigable map which forwards all its method calls to another navigable map. Subclasses should override one or more methods to modify the behavior of the backing map as desired per the decorator pattern.

Warning: The methods of ForwardingNavigableMap 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.

Each of the standard methods uses the map's comparator (or the natural ordering of the elements, if there is no comparator) to test element equality. As a result, if the comparator is not consistent with equals, some of the standard implementations may violate the Map contract.

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.

Since:

12.0

Author:

Louis Wasserman

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	ForwardingNavigableMap.StandardDescendingMap A sensible implementation of NavigableMap.descendingMap() in terms of the methods of this NavigableMap.
protected class	ForwardingNavigableMap.StandardNavigableKeySet A sensible implementation of NavigableMap.navigableKeySet() in terms of the methods of this NavigableMap.

Nested classes/interfaces inherited from class com.google.common.collect.ForwardingMap

ForwardingMap.StandardEntrySet, ForwardingMap.StandardKeySet, ForwardingMap.StandardValues

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ForwardingNavigableMap() Constructor for use by subclasses.

Method Summary

Methods

Modifier and Type	Method and Description
Map.Entry<K,V>	ceilingEntry(K key)
K	ceilingKey(K key)
protected abstract NavigableMap<K,V>	delegate() Returns the backing delegate instance that methods are forwarded to.
NavigableSet<K>	descendingKeySet()
NavigableMap<K,V>	descendingMap()
Map.Entry<K,V>	firstEntry()
Map.Entry<K,V>	floorEntry(K key)
K	floorKey(K key)
NavigableMap<K,V>	headMap(K toKey, boolean inclusive)
Map.Entry<K,V>	higherEntry(K key)
K	higherKey(K key)
Map.Entry<K,V>	lastEntry()
Map.Entry<K,V>	lowerEntry(K key)
K	lowerKey(K key)
NavigableSet<K>	navigableKeySet()
Map.Entry<K,V>	pollFirstEntry()
Map.Entry<K,V>	pollLastEntry()
protected Map.Entry<K,V>	standardCeilingEntry(K key) A sensible definition of ceilingEntry(K) in terms of the firstEntry() of tailMap(Object, boolean).
protected K	standardCeilingKey(K key) A sensible definition of ceilingKey(K) in terms of ceilingEntry.
protected NavigableSet<K>	standardDescendingKeySet() A sensible definition of descendingKeySet() as the navigableKeySet of descendingMap().
protected Map.Entry<K,V>	standardFirstEntry() A sensible definition of firstEntry() in terms of the iterator() of ForwardingMap.entrySet().
protected K	standardFirstKey() A sensible definition of ForwardingSortedMap.firstKey() in terms of firstEntry.
protected Map.Entry<K,V>	standardFloorEntry(K key) A sensible definition of floorEntry(K) in terms of the lastEntry() of headMap(Object, boolean).
protected K	standardFloorKey(K key) A sensible definition of floorKey(K) in terms of floorEntry.
protected SortedMap<K,V>	standardHeadMap(K toKey) A sensible definition of ForwardingSortedMap.headMap(Object) in terms of headMap(Object, boolean).
protected Map.Entry<K,V>	standardHigherEntry(K key) A sensible definition of higherEntry(K) in terms of the firstEntry() of tailMap(Object, boolean).
protected K	standardHigherKey(K key) A sensible definition of higherKey(K) in terms of higherEntry.
protected Map.Entry<K,V>	standardLastEntry() A sensible definition of lastEntry() in terms of the iterator() of the ForwardingMap.entrySet() of descendingMap().
protected K	standardLastKey() A sensible definition of ForwardingSortedMap.lastKey() in terms of lastEntry.
protected Map.Entry<K,V>	standardLowerEntry(K key) A sensible definition of lowerEntry(K) in terms of the lastEntry() of headMap(Object, boolean).
protected K	standardLowerKey(K key) A sensible definition of lowerKey(K) in terms of lowerEntry.
protected Map.Entry<K,V>	standardPollFirstEntry() A sensible definition of pollFirstEntry() in terms of the iterator of entrySet.
protected Map.Entry<K,V>	standardPollLastEntry() A sensible definition of pollFirstEntry() in terms of the iterator of the entrySet of descendingMap.
protected SortedMap<K,V>	standardSubMap(K fromKey, K toKey) A sensible definition of ForwardingSortedMap.subMap(Object, Object) in terms of subMap(Object, boolean, Object, boolean).
protected SortedMap<K,V>	standardTailMap(K fromKey) A sensible definition of ForwardingSortedMap.tailMap(Object) in terms of tailMap(Object, boolean).
NavigableMap<K,V>	subMap(K fromKey, boolean fromInclusive, K toKey, boolean toInclusive)
NavigableMap<K,V>	tailMap(K fromKey, boolean inclusive)

Methods inherited from class com.google.common.collect.ForwardingSortedMap

comparator, firstKey, headMap, lastKey, standardContainsKey, standardRemove, subMap, tailMap

Methods inherited from class com.google.common.collect.ForwardingMap

clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, put, putAll, remove, size, standardClear, standardContainsValue, standardEquals, standardHashCode, standardIsEmpty, standardPutAll, standardToString, values

Methods inherited from class com.google.common.collect.ForwardingObject

toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.NavigableMap

headMap, subMap, tailMap

Methods inherited from interface java.util.SortedMap

comparator, entrySet, firstKey, keySet, lastKey, values

Methods inherited from interface java.util.Map

clear, containsKey, containsValue, equals, get, hashCode, isEmpty, put, putAll, remove, size

Constructor Detail

ForwardingNavigableMap

protected ForwardingNavigableMap()

Constructor for use by subclasses.

Method Detail

delegate

protected abstract NavigableMap<K,V> delegate()

Description copied from class: ForwardingObject

Returns the backing delegate instance that methods are forwarded to. Abstract subclasses generally override this method with an abstract method that has a more specific return type, such as ForwardingSet.delegate(). Concrete subclasses override this method to supply the instance being decorated.

Specified by:

delegate in class ForwardingSortedMap<K,V>

lowerEntry

public Map.Entry<K,V> lowerEntry(K key)

Specified by:

lowerEntry in interface NavigableMap<K,V>

standardLowerEntry

protected Map.Entry<K,V> standardLowerEntry(K key)

A sensible definition of lowerEntry(K) in terms of the lastEntry() of headMap(Object, boolean). If you override headMap, you may wish to override lowerEntry to forward to this implementation.

lowerKey

public K lowerKey(K key)

Specified by:

lowerKey in interface NavigableMap<K,V>

standardLowerKey

protected K standardLowerKey(K key)

A sensible definition of lowerKey(K) in terms of lowerEntry. If you override lowerEntry(K), you may wish to override lowerKey to forward to this implementation.

floorEntry

public Map.Entry<K,V> floorEntry(K key)

Specified by:

floorEntry in interface NavigableMap<K,V>

standardFloorEntry

protected Map.Entry<K,V> standardFloorEntry(K key)

A sensible definition of floorEntry(K) in terms of the lastEntry() of headMap(Object, boolean). If you override headMap, you may wish to override floorEntry to forward to this implementation.

floorKey

public K floorKey(K key)

Specified by:

floorKey in interface NavigableMap<K,V>

standardFloorKey

protected K standardFloorKey(K key)

A sensible definition of floorKey(K) in terms of floorEntry. If you override floorEntry, you may wish to override floorKey to forward to this implementation.

ceilingEntry

public Map.Entry<K,V> ceilingEntry(K key)

Specified by:

ceilingEntry in interface NavigableMap<K,V>

standardCeilingEntry

protected Map.Entry<K,V> standardCeilingEntry(K key)

A sensible definition of ceilingEntry(K) in terms of the firstEntry() of tailMap(Object, boolean). If you override tailMap, you may wish to override ceilingEntry to forward to this implementation.

ceilingKey

public K ceilingKey(K key)

Specified by:

ceilingKey in interface NavigableMap<K,V>

standardCeilingKey

protected K standardCeilingKey(K key)

A sensible definition of ceilingKey(K) in terms of ceilingEntry. If you override ceilingEntry, you may wish to override ceilingKey to forward to this implementation.

higherEntry

public Map.Entry<K,V> higherEntry(K key)

Specified by:

higherEntry in interface NavigableMap<K,V>

standardHigherEntry

protected Map.Entry<K,V> standardHigherEntry(K key)

A sensible definition of higherEntry(K) in terms of the firstEntry() of tailMap(Object, boolean). If you override tailMap, you may wish to override higherEntry to forward to this implementation.

higherKey

public K higherKey(K key)

Specified by:

higherKey in interface NavigableMap<K,V>

standardHigherKey

protected K standardHigherKey(K key)

A sensible definition of higherKey(K) in terms of higherEntry. If you override higherEntry, you may wish to override higherKey to forward to this implementation.

firstEntry

public Map.Entry<K,V> firstEntry()

Specified by:

firstEntry in interface NavigableMap<K,V>

standardFirstEntry

protected Map.Entry<K,V> standardFirstEntry()

A sensible definition of firstEntry() in terms of the iterator() of ForwardingMap.entrySet(). If you override entrySet, you may wish to override firstEntry to forward to this implementation.

standardFirstKey

protected K standardFirstKey()

A sensible definition of ForwardingSortedMap.firstKey() in terms of firstEntry. If you override firstEntry, you may wish to override firstKey to forward to this implementation.

lastEntry

public Map.Entry<K,V> lastEntry()

Specified by:

lastEntry in interface NavigableMap<K,V>

standardLastEntry

protected Map.Entry<K,V> standardLastEntry()

A sensible definition of lastEntry() in terms of the iterator() of the ForwardingMap.entrySet() of descendingMap(). If you override descendingMap, you may wish to override lastEntry to forward to this implementation.

standardLastKey

protected K standardLastKey()

A sensible definition of ForwardingSortedMap.lastKey() in terms of lastEntry. If you override lastEntry, you may wish to override lastKey to forward to this implementation.

pollFirstEntry

public Map.Entry<K,V> pollFirstEntry()

Specified by:

pollFirstEntry in interface NavigableMap<K,V>

standardPollFirstEntry

protected Map.Entry<K,V> standardPollFirstEntry()

A sensible definition of pollFirstEntry() in terms of the iterator of entrySet. If you override entrySet, you may wish to override pollFirstEntry to forward to this implementation.

pollLastEntry

public Map.Entry<K,V> pollLastEntry()

Specified by:

pollLastEntry in interface NavigableMap<K,V>

standardPollLastEntry

protected Map.Entry<K,V> standardPollLastEntry()

A sensible definition of pollFirstEntry() in terms of the iterator of the entrySet of descendingMap. If you override descendingMap, you may wish to override pollFirstEntry to forward to this implementation.

descendingMap

public NavigableMap<K,V> descendingMap()

Specified by:

descendingMap in interface NavigableMap<K,V>

navigableKeySet

public NavigableSet<K> navigableKeySet()

Specified by:

navigableKeySet in interface NavigableMap<K,V>

descendingKeySet

public NavigableSet<K> descendingKeySet()

Specified by:

descendingKeySet in interface NavigableMap<K,V>

standardDescendingKeySet

@Beta
protected NavigableSet<K> standardDescendingKeySet()

A sensible definition of descendingKeySet() as the navigableKeySet of descendingMap(). (The ForwardingNavigableMap.StandardDescendingMap implementation implements navigableKeySet on its own, so as not to cause an infinite loop.) If you override descendingMap, you may wish to override descendingKeySet to forward to this implementation.

standardSubMap

protected SortedMap<K,V> standardSubMap(K fromKey,
                            K toKey)

A sensible definition of ForwardingSortedMap.subMap(Object, Object) in terms of subMap(Object, boolean, Object, boolean). If you override subMap(K, boolean, K, boolean), you may wish to override subMap to forward to this implementation.

Overrides:

standardSubMap in class ForwardingSortedMap<K,V>

subMap

public NavigableMap<K,V> subMap(K fromKey,
                       boolean fromInclusive,
                       K toKey,
                       boolean toInclusive)

Specified by:

subMap in interface NavigableMap<K,V>

headMap

public NavigableMap<K,V> headMap(K toKey,
                        boolean inclusive)

Specified by:

headMap in interface NavigableMap<K,V>

tailMap

public NavigableMap<K,V> tailMap(K fromKey,
                        boolean inclusive)

Specified by:

tailMap in interface NavigableMap<K,V>

standardHeadMap

protected SortedMap<K,V> standardHeadMap(K toKey)

A sensible definition of ForwardingSortedMap.headMap(Object) in terms of headMap(Object, boolean). If you override headMap(K, boolean), you may wish to override headMap to forward to this implementation.

standardTailMap

protected SortedMap<K,V> standardTailMap(K fromKey)

A sensible definition of ForwardingSortedMap.tailMap(Object) in terms of tailMap(Object, boolean). If you override tailMap(K, boolean), you may wish to override tailMap to forward to this implementation.