edu.tum.cs.commons.collections
Class UnmodifiableSortedMap<K,V>

java.lang.Object
  edu.tum.cs.commons.collections.UnmodifiableMap<K,V>
      edu.tum.cs.commons.collections.UnmodifiableSortedMap<K,V>

All Implemented Interfaces:

Serializable, Map<K,V>, SortedMap<K,V>

public class UnmodifiableSortedMap<K,V>
extends UnmodifiableMap<K,V>
implements SortedMap<K,V>

This is a wrapper for a SortedMap prohibiting all calls which would modify its contents. As the construction of this class is performed in constant time it is prefered over copying the map (which takes linear time). Using this class is also preferred to using the unmodifiableX() in class Collections as they return the collection base type that does not signal, that the object ist unmodifiable. Using the classes in this package makes unmodifiability more explicit.

All prohibited methods throw an UnsupportedOperationException. The class is nearly the same as the one returned by Collections.unmodifiableSortedMap(SortedMap), but by making it a public class we can make the return value of some methods more explicit.

Version:

$Revision: 26283 $

Author:

Benjamin Hummel, $Author: juergens $

See Also:

Serialized Form

Rating:

GREEN Hash: ABDE6CF5CE63ADC67CA6BB5BB9D17737

Nested Class Summary

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

Map.Entry<K,V>

Constructor Summary

UnmodifiableSortedMap(SortedMap<K,V> m)
Creates a new unmodifiable sorted map from another sorted map.

Method Summary

Comparator<? super K>	comparator()
K	firstKey()
UnmodifiableSortedMap<K,V>	headMap(K toKey)
K	lastKey()
UnmodifiableSortedMap<K,V>	subMap(K fromKey, K toKey)
UnmodifiableSortedMap<K,V>	tailMap(K fromKey)

Methods inherited from class edu.tum.cs.commons.collections.UnmodifiableMap

clear, containsKey, containsValue, entrySet, get, isEmpty, keySet, put, putAll, remove, size, toString, values

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, 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

UnmodifiableSortedMap

public UnmodifiableSortedMap(SortedMap<K,V> m)

Creates a new unmodifiable sorted map from another sorted map. All modifications to the underlying map will directly be visible in this wrapper.

Method Detail

comparator

public Comparator<? super K> comparator()

Specified by:

comparator in interface SortedMap<K,V>

firstKey

public K firstKey()

Specified by:

firstKey in interface SortedMap<K,V>

headMap

public UnmodifiableSortedMap<K,V> headMap(K toKey)

Specified by:

headMap in interface SortedMap<K,V>

lastKey

public K lastKey()

Specified by:

lastKey in interface SortedMap<K,V>

subMap

public UnmodifiableSortedMap<K,V> subMap(K fromKey,
                                         K toKey)

Specified by:

subMap in interface SortedMap<K,V>

tailMap

public UnmodifiableSortedMap<K,V> tailMap(K fromKey)

Specified by:

tailMap in interface SortedMap<K,V>