Package org.apache.commons.collections4.map

Class UnmodifiableSortedMap<K,V>

java.lang.Object

org.apache.commons.collections4.map.AbstractIterableMap<K,V>

org.apache.commons.collections4.map.AbstractMapDecorator<K,V>

org.apache.commons.collections4.map.AbstractSortedMapDecorator<K,V>

org.apache.commons.collections4.map.UnmodifiableSortedMap<K,V>

Type Parameters:

K - the type of the keys in this map

V - the type of the values in this map

All Implemented Interfaces:

Serializable, Map<K,V>, SortedMap<K,V>, Get<K,V>, IterableGet<K,V>, IterableMap<K,V>, IterableSortedMap<K,V>, OrderedMap<K,V>, Put<K,V>, Unmodifiable

public final class UnmodifiableSortedMap<K,V>
extends AbstractSortedMapDecorator<K,V>
implements Unmodifiable, Serializable

Decorates another SortedMap to ensure it can't be altered.

This class is Serializable from Commons Collections 3.1.

Attempts to modify it will result in an UnsupportedOperationException.

Since:

3.0

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.commons.collections4.map.AbstractSortedMapDecorator

AbstractSortedMapDecorator.SortedMapIterator<K,V>

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

Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field	Description
private static final long	serialVersionUID	Serialization version

Fields inherited from class org.apache.commons.collections4.map.AbstractMapDecorator

map

Constructor Summary

Constructors

Modifier	Constructor	Description
private	UnmodifiableSortedMap(SortedMap<K,? extends V> map)	Constructor that wraps (not copies).

Method Summary

Modifier and Type	Method	Description
void	clear()
Comparator<? super K>	comparator()
Set<Map.Entry<K,V>>	entrySet()
K	firstKey()	Gets the first key currently in this map.
SortedMap<K,V>	headMap(K toKey)
Set<K>	keySet()
K	lastKey()	Gets the last key currently in this map.
V	put(K key, V value)	Note that the return type is Object, rather than V as in the Map interface.
void	putAll(Map<? extends K,? extends V> mapToCopy)
private void	readObject(ObjectInputStream in)	Read the map in using a custom routine.
V	remove(Object key)
SortedMap<K,V>	subMap(K fromKey, K toKey)
SortedMap<K,V>	tailMap(K fromKey)
static <K, V> SortedMap<K,V>	unmodifiableSortedMap(SortedMap<K,? extends V> map)	Factory method to create an unmodifiable sorted map.
Collection<V>	values()
private void	writeObject(ObjectOutputStream out)	Write the map out using a custom routine.

Methods inherited from class org.apache.commons.collections4.map.AbstractSortedMapDecorator

decorated, mapIterator, nextKey, previousKey

Methods inherited from class org.apache.commons.collections4.map.AbstractMapDecorator

containsKey, containsValue, equals, get, hashCode, isEmpty, size, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.commons.collections4.Get

containsKey, containsValue, get, isEmpty, size

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, equals, forEach, get, getOrDefault, hashCode, isEmpty, merge, putIfAbsent, remove, replace, replace, replaceAll, size

Field Details

serialVersionUID

private static final long serialVersionUID

Serialization version

See Also:

• Constant Field Values

Constructor Details

UnmodifiableSortedMap

private UnmodifiableSortedMap(SortedMap<K,? extends V> map)

Constructor that wraps (not copies).

Parameters:

map - the map to decorate, must not be null

Throws:

NullPointerException - if map is null

Method Details

unmodifiableSortedMap

public static <K,
V> SortedMap<K,V> unmodifiableSortedMap(SortedMap<K,? extends V> map)

Factory method to create an unmodifiable sorted map.

Type Parameters:

K - the key type

V - the value type

Parameters:

map - the map to decorate, must not be null

Returns:

a new unmodifiable sorted map

Throws:

NullPointerException - if map is null

Since:

4.0

writeObject

private void writeObject(ObjectOutputStream out)
                  throws IOException

Write the map out using a custom routine.

Parameters:

out - the output stream

Throws:

IOException - if an error occurs while writing to the stream

Since:

3.1

readObject

private void readObject(ObjectInputStream in)
                 throws IOException,
ClassNotFoundException

Read the map in using a custom routine.

Parameters:

in - the input stream

Throws:

IOException - if an error occurs while reading from the stream

ClassNotFoundException - if an object read from the stream can not be loaded

Since:

3.1

clear

public void clear()

Specified by:

clear in interface Map<K,V>

Specified by:

clear in interface Put<K,V>

Overrides:

clear in class AbstractMapDecorator<K,V>

See Also:

• Map.clear()

put

public V put(K key,
 V value)

Description copied from interface: Put

Note that the return type is Object, rather than V as in the Map interface. See the class Javadoc for further info.

Specified by:

put in interface Map<K,V>

Specified by:

put in interface Put<K,V>

Overrides:

put in class AbstractMapDecorator<K,V>

Parameters:

key - key with which the specified value is to be associated

value - value to be associated with the specified key

Returns:

the previous value associated with key, or null if there was no mapping for key. (A null return can also indicate that the map previously associated null with key, if the implementation supports null values.)

See Also:

• Map.put(Object, Object)

putAll

public void putAll(Map<? extends K,? extends V> mapToCopy)

Specified by:

putAll in interface Map<K,V>

Specified by:

putAll in interface Put<K,V>

Overrides:

putAll in class AbstractMapDecorator<K,V>

Parameters:

mapToCopy - mappings to be stored in this map

See Also:

• Map.putAll(Map)

remove

public V remove(Object key)

Specified by:

remove in interface Get<K,V>

Specified by:

remove in interface Map<K,V>

Overrides:

remove in class AbstractMapDecorator<K,V>

Parameters:

key - key whose mapping is to be removed from the map

Returns:

the previous value associated with key, or null if there was no mapping for key.

See Also:

• Map.remove(Object)

entrySet

public Set<Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface Get<K,V>

Specified by:

entrySet in interface Map<K,V>

Specified by:

entrySet in interface SortedMap<K,V>

Overrides:

entrySet in class AbstractMapDecorator<K,V>

Returns:

a set view of the mappings contained in this map

See Also:

• Map.entrySet()

keySet

public Set<K> keySet()

Specified by:

keySet in interface Get<K,V>

Specified by:

keySet in interface Map<K,V>

Specified by:

keySet in interface SortedMap<K,V>

Overrides:

keySet in class AbstractMapDecorator<K,V>

Returns:

a set view of the keys contained in this map

See Also:

• Map.keySet()

values

public Collection<V> values()

Specified by:

values in interface Get<K,V>

Specified by:

values in interface Map<K,V>

Specified by:

values in interface SortedMap<K,V>

Overrides:

values in class AbstractMapDecorator<K,V>

Returns:

a collection view of the values contained in this map

See Also:

• Map.values()

firstKey

public K firstKey()

Description copied from interface: OrderedMap

Gets the first key currently in this map.

Specified by:

firstKey in interface OrderedMap<K,V>

Specified by:

firstKey in interface SortedMap<K,V>

Overrides:

firstKey in class AbstractSortedMapDecorator<K,V>

Returns:

the first key currently in this map

lastKey

public K lastKey()

Description copied from interface: OrderedMap

Gets the last key currently in this map.

Specified by:

lastKey in interface OrderedMap<K,V>

Specified by:

lastKey in interface SortedMap<K,V>

Overrides:

lastKey in class AbstractSortedMapDecorator<K,V>

Returns:

the last key currently in this map

comparator

public Comparator<? super K> comparator()

Specified by:

comparator in interface SortedMap<K,V>

Overrides:

comparator in class AbstractSortedMapDecorator<K,V>

subMap

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

Specified by:

subMap in interface SortedMap<K,V>

Overrides:

subMap in class AbstractSortedMapDecorator<K,V>

headMap

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

Specified by:

headMap in interface SortedMap<K,V>

Overrides:

headMap in class AbstractSortedMapDecorator<K,V>

tailMap

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

Specified by:

tailMap in interface SortedMap<K,V>

Overrides:

tailMap in class AbstractSortedMapDecorator<K,V>