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

java.lang.Object
  extended by com.google.common.collect.ForwardingObject
      extended by com.google.common.collect.ForwardingMap<K,V>
          extended by com.google.common.collect.ForwardingSortedMap<K,V>
All Implemented Interfaces:
Map<K,V>, SortedMap<K,V>
@GwtCompatible
public abstract class ForwardingSortedMap<K,V>
extends ForwardingMap<K,V>
implements SortedMap<K,V>

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

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), 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, 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.

Since:
2 (imported from Google Collections Library)
Author:
Mike Bostock, Louis Wasserman

Nested Class Summary
 
Nested classes/interfaces inherited from interface java.util.Map
Map.Entry<K,V>
 
Constructor Summary
protected ForwardingSortedMap()
          Constructor for use by subclasses.
 
Method Summary
 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(Object key)
          A sensible definition of ForwardingMap.containsKey(java.lang.Object) in terms of the firstKey() method of tailMap(K).
protected  V standardRemove(Object key)
          A sensible definition of ForwardingMap.remove(java.lang.Object) in terms of the iterator() of the entrySet() 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.
 
Methods inherited from class com.google.common.collect.ForwardingMap
clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, put, putAll, remove, size, standardClear, standardContainsValue, standardEntrySet, standardEquals, standardHashCode, standardIsEmpty, standardKeySet, standardPutAll, standardToString, standardValues, 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.SortedMap
entrySet, keySet, values
 
Methods inherited from interface java.util.Map
clear, containsKey, containsValue, equals, get, hashCode, isEmpty, put, putAll, remove, size
 

Constructor Detail

ForwardingSortedMap

protected ForwardingSortedMap()
Constructor for use by subclasses.

Method Detail

delegate

protected abstract SortedMap<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 ForwardingMap<K,V>

comparator

public Comparator<? super K> comparator()
Description copied from interface: java.util.SortedMap
Returns the comparator used to order the keys in this map, or null if this map uses the natural ordering of its keys.

Specified by:
comparator in interface SortedMap<K,V>
Returns:
the comparator used to order the keys in this map, or null if this map uses the natural ordering of its keys

firstKey

public K firstKey()
Description copied from interface: java.util.SortedMap
Returns the first (lowest) key currently in this map.

Specified by:
firstKey in interface SortedMap<K,V>
Returns:
the first (lowest) key currently in this map

headMap

public SortedMap<K,V> headMap(K toKey)
Description copied from interface: java.util.SortedMap
Returns a view of the portion of this map whose keys are strictly less than 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.

Specified by:
headMap in interface SortedMap<K,V>
Parameters:
toKey - high endpoint (exclusive) of the keys in the returned map
Returns:
a view of the portion of this map whose keys are strictly less than toKey

lastKey

public K lastKey()
Description copied from interface: java.util.SortedMap
Returns the last (highest) key currently in this map.

Specified by:
lastKey in interface SortedMap<K,V>
Returns:
the last (highest) key currently in this map

subMap

public SortedMap<K,V> subMap(K fromKey,
                             K toKey)
Description copied from interface: java.util.SortedMap
Returns a view of the portion of this map whose keys range from 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.

Specified by:
subMap in interface SortedMap<K,V>
Parameters:
fromKey - low endpoint (inclusive) of the keys in the returned map
toKey - high endpoint (exclusive) of the keys in the returned map
Returns:
a view of the portion of this map whose keys range from fromKey, inclusive, to toKey, exclusive

tailMap

public SortedMap<K,V> tailMap(K fromKey)
Description copied from interface: java.util.SortedMap
Returns a view of the portion of this map whose keys are greater than or equal to 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.

Specified by:
tailMap in interface SortedMap<K,V>
Parameters:
fromKey - low endpoint (inclusive) of the keys in the returned map
Returns:
a view of the portion of this map whose keys are greater than or equal to fromKey

standardContainsKey

@Beta
protected boolean standardContainsKey(@Nullable
                                           Object key)
A sensible definition of 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.

Overrides:
standardContainsKey in class ForwardingMap<K,V>
Since:
7

standardRemove

@Beta
protected V standardRemove(@Nullable
                                Object key)
A sensible definition of ForwardingMap.remove(java.lang.Object) in terms of the iterator() of the entrySet() of tailMap(K). If you override tailMap(K), you may wish to override ForwardingMap.remove(java.lang.Object) to forward to this implementation.

Overrides:
standardRemove in class ForwardingMap<K,V>
Since:
7

standardSubMap

@Beta
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). In some situations, you may wish to override subMap(Object, Object) to forward to this implementation.

Since:
7
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